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42c69189d97c2cbf55d863b30a3444260037b34e
cpython-source-deps/generic/tkCanvLine.c
Steve Dower 42c69189d9 Import Tk 8.6.10
2020-09-24 22:55:34 +01:00

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/*
* tkCanvLine.c --
*
* This file implements line items for canvas widgets.
*
* Copyright (c) 1991-1994 The Regents of the University of California.
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
* Copyright (c) 1998-1999 by Scriptics Corporation.
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkInt.h"
#include "tkCanvas.h"
#include "default.h"
/*
* The structure below defines the record for each line item.
*/
typedef enum {
ARROWS_NONE, ARROWS_FIRST, ARROWS_LAST, ARROWS_BOTH
} Arrows;
typedef struct LineItem {
Tk_Item header; /* Generic stuff that's the same for all
* types. MUST BE FIRST IN STRUCTURE. */
Tk_Outline outline; /* Outline structure */
Tk_Canvas canvas; /* Canvas containing item. Needed for parsing
* arrow shapes. */
int numPoints; /* Number of points in line (always >= 0). */
double *coordPtr; /* Pointer to malloc-ed array containing x-
* and y-coords of all points in line.
* X-coords are even-valued indices, y-coords
* are corresponding odd-valued indices. If
* the line has arrowheads then the first and
* last points have been adjusted to refer to
* the necks of the arrowheads rather than
* their tips. The actual endpoints are stored
* in the *firstArrowPtr and *lastArrowPtr, if
* they exist. */
int capStyle; /* Cap style for line. */
int joinStyle; /* Join style for line. */
GC arrowGC; /* Graphics context for drawing arrowheads. */
Arrows arrow; /* Indicates whether or not to draw arrowheads:
* "none", "first", "last", or "both". */
float arrowShapeA; /* Distance from tip of arrowhead to center. */
float arrowShapeB; /* Distance from tip of arrowhead to trailing
* point, measured along shaft. */
float arrowShapeC; /* Distance of trailing points from outside
* edge of shaft. */
double *firstArrowPtr; /* Points to array of PTS_IN_ARROW points
* describing polygon for arrowhead at first
* point in line. First point of arrowhead is
* tip. Malloc'ed. NULL means no arrowhead at
* first point. */
double *lastArrowPtr; /* Points to polygon for arrowhead at last
* point in line (PTS_IN_ARROW points, first
* of which is tip). Malloc'ed. NULL means no
* arrowhead at last point. */
const Tk_SmoothMethod *smooth; /* Non-zero means draw line smoothed (i.e.
* with Bezier splines). */
int splineSteps; /* Number of steps in each spline segment. */
} LineItem;
/*
* Number of points in an arrowHead:
*/
#define PTS_IN_ARROW 6
/*
* Prototypes for functions defined in this file:
*/
static int ArrowheadPostscript(Tcl_Interp *interp,
Tk_Canvas canvas, LineItem *linePtr,
double *arrowPtr, Tcl_Obj *psObj);
static void ComputeLineBbox(Tk_Canvas canvas, LineItem *linePtr);
static int ConfigureLine(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int objc,
Tcl_Obj *const objv[], int flags);
static int ConfigureArrows(Tk_Canvas canvas, LineItem *linePtr);
static int CreateLine(Tcl_Interp *interp,
Tk_Canvas canvas, struct Tk_Item *itemPtr,
int objc, Tcl_Obj *const objv[]);
static void DeleteLine(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display);
static void DisplayLine(Tk_Canvas canvas,
Tk_Item *itemPtr, Display *display, Drawable dst,
int x, int y, int width, int height);
static int GetLineIndex(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr,
Tcl_Obj *obj, int *indexPtr);
static int LineCoords(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr,
int objc, Tcl_Obj *const objv[]);
static void LineDeleteCoords(Tk_Canvas canvas,
Tk_Item *itemPtr, int first, int last);
static void LineInsert(Tk_Canvas canvas,
Tk_Item *itemPtr, int beforeThis, Tcl_Obj *obj);
static int LineToArea(Tk_Canvas canvas,
Tk_Item *itemPtr, double *rectPtr);
static double LineToPoint(Tk_Canvas canvas,
Tk_Item *itemPtr, double *coordPtr);
static int LineToPostscript(Tcl_Interp *interp,
Tk_Canvas canvas, Tk_Item *itemPtr, int prepass);
static int ArrowParseProc(ClientData clientData,
Tcl_Interp *interp, Tk_Window tkwin,
const char *value, char *recordPtr, int offset);
static const char * ArrowPrintProc(ClientData clientData,
Tk_Window tkwin, char *recordPtr, int offset,
Tcl_FreeProc **freeProcPtr);
static int ParseArrowShape(ClientData clientData,
Tcl_Interp *interp, Tk_Window tkwin,
const char *value, char *recordPtr, int offset);
static const char * PrintArrowShape(ClientData clientData,
Tk_Window tkwin, char *recordPtr, int offset,
Tcl_FreeProc **freeProcPtr);
static void ScaleLine(Tk_Canvas canvas,
Tk_Item *itemPtr, double originX, double originY,
double scaleX, double scaleY);
static void TranslateLine(Tk_Canvas canvas,
Tk_Item *itemPtr, double deltaX, double deltaY);
/*
* Information used for parsing configuration specs. If you change any of the
* default strings, be sure to change the corresponding default values in
* CreateLine.
*/
static const Tk_CustomOption arrowShapeOption = {
ParseArrowShape, PrintArrowShape, NULL
};
static const Tk_CustomOption arrowOption = {
ArrowParseProc, ArrowPrintProc, NULL
};
static const Tk_CustomOption smoothOption = {
TkSmoothParseProc, TkSmoothPrintProc, NULL
};
static const Tk_CustomOption stateOption = {
TkStateParseProc, TkStatePrintProc, INT2PTR(2)
};
static const Tk_CustomOption tagsOption = {
Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, NULL
};
static const Tk_CustomOption dashOption = {
TkCanvasDashParseProc, TkCanvasDashPrintProc, NULL
};
static const Tk_CustomOption offsetOption = {
TkOffsetParseProc, TkOffsetPrintProc,
INT2PTR(TK_OFFSET_RELATIVE|TK_OFFSET_INDEX)
};
static const Tk_CustomOption pixelOption = {
TkPixelParseProc, TkPixelPrintProc, NULL
};
static const Tk_ConfigSpec configSpecs[] = {
{TK_CONFIG_CUSTOM, "-activedash", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.activeDash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_COLOR, "-activefill", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.activeColor), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_BITMAP, "-activestipple", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.activeStipple), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_CUSTOM, "-activewidth", NULL, NULL,
"0.0", Tk_Offset(LineItem, outline.activeWidth),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_CUSTOM, "-arrow", NULL, NULL,
"none", Tk_Offset(LineItem, arrow),
TK_CONFIG_DONT_SET_DEFAULT, &arrowOption},
{TK_CONFIG_CUSTOM, "-arrowshape", NULL, NULL,
"8 10 3", Tk_Offset(LineItem, arrowShapeA),
TK_CONFIG_DONT_SET_DEFAULT, &arrowShapeOption},
{TK_CONFIG_CAP_STYLE, "-capstyle", NULL, NULL,
"butt", Tk_Offset(LineItem, capStyle), TK_CONFIG_DONT_SET_DEFAULT, NULL},
{TK_CONFIG_COLOR, "-fill", NULL, NULL,
DEF_CANVITEM_OUTLINE, Tk_Offset(LineItem, outline.color), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_CUSTOM, "-dash", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.dash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_PIXELS, "-dashoffset", NULL, NULL,
"0", Tk_Offset(LineItem, outline.offset), TK_CONFIG_DONT_SET_DEFAULT, NULL},
{TK_CONFIG_CUSTOM, "-disableddash", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.disabledDash),
TK_CONFIG_NULL_OK, &dashOption},
{TK_CONFIG_COLOR, "-disabledfill", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.disabledColor), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_BITMAP, "-disabledstipple", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.disabledStipple), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_CUSTOM, "-disabledwidth", NULL, NULL,
"0.0", Tk_Offset(LineItem, outline.disabledWidth),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_JOIN_STYLE, "-joinstyle", NULL, NULL,
"round", Tk_Offset(LineItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT, NULL},
{TK_CONFIG_CUSTOM, "-offset", NULL, NULL,
"0,0", Tk_Offset(LineItem, outline.tsoffset),
TK_CONFIG_DONT_SET_DEFAULT, &offsetOption},
{TK_CONFIG_CUSTOM, "-smooth", NULL, NULL,
"0", Tk_Offset(LineItem, smooth),
TK_CONFIG_DONT_SET_DEFAULT, &smoothOption},
{TK_CONFIG_INT, "-splinesteps", NULL, NULL,
"12", Tk_Offset(LineItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT, NULL},
{TK_CONFIG_CUSTOM, "-state", NULL, NULL,
NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption},
{TK_CONFIG_BITMAP, "-stipple", NULL, NULL,
NULL, Tk_Offset(LineItem, outline.stipple), TK_CONFIG_NULL_OK, NULL},
{TK_CONFIG_CUSTOM, "-tags", NULL, NULL,
NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
{TK_CONFIG_CUSTOM, "-width", NULL, NULL,
"1.0", Tk_Offset(LineItem, outline.width),
TK_CONFIG_DONT_SET_DEFAULT, &pixelOption},
{TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0, NULL}
};
/*
* The structures below defines the line item type by means of functions that
* can be invoked by generic item code.
*/
Tk_ItemType tkLineType = {
"line", /* name */
sizeof(LineItem), /* itemSize */
CreateLine, /* createProc */
configSpecs, /* configSpecs */
ConfigureLine, /* configureProc */
LineCoords, /* coordProc */
DeleteLine, /* deleteProc */
DisplayLine, /* displayProc */
TK_CONFIG_OBJS | TK_MOVABLE_POINTS, /* flags */
LineToPoint, /* pointProc */
LineToArea, /* areaProc */
LineToPostscript, /* postscriptProc */
ScaleLine, /* scaleProc */
TranslateLine, /* translateProc */
GetLineIndex, /* indexProc */
NULL, /* icursorProc */
NULL, /* selectionProc */
LineInsert, /* insertProc */
LineDeleteCoords, /* dTextProc */
NULL, /* nextPtr */
NULL, 0, NULL, NULL
};
/*
* The definition below determines how large are static arrays used to hold
* spline points (splines larger than this have to have their arrays
* malloc-ed).
*/
#define MAX_STATIC_POINTS 200
/*
*--------------------------------------------------------------
*
* CreateLine --
*
* This function is invoked to create a new line item in a canvas.
*
* Results:
* A standard Tcl return value. If an error occurred in creating the
* item, then an error message is left in the interp's result; in this
* case itemPtr is left uninitialized, so it can be safely freed by the
* caller.
*
* Side effects:
* A new line item is created.
*
*--------------------------------------------------------------
*/
static int
CreateLine(
Tcl_Interp *interp, /* Interpreter for error reporting. */
Tk_Canvas canvas, /* Canvas to hold new item. */
Tk_Item *itemPtr, /* Record to hold new item; header has been
* initialized by caller. */
int objc, /* Number of arguments in objv. */
Tcl_Obj *const objv[]) /* Arguments describing line. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int i;
if (objc == 0) {
Tcl_Panic("canvas did not pass any coords");
}
/*
* Carry out initialization that is needed to set defaults and to allow
* proper cleanup after errors during the the remainder of this function.
*/
Tk_CreateOutline(&linePtr->outline);
linePtr->canvas = canvas;
linePtr->numPoints = 0;
linePtr->coordPtr = NULL;
linePtr->capStyle = CapButt;
linePtr->joinStyle = JoinRound;
linePtr->arrowGC = NULL;
linePtr->arrow = ARROWS_NONE;
linePtr->arrowShapeA = (float)8.0;
linePtr->arrowShapeB = (float)10.0;
linePtr->arrowShapeC = (float)3.0;
linePtr->firstArrowPtr = NULL;
linePtr->lastArrowPtr = NULL;
linePtr->smooth = NULL;
linePtr->splineSteps = 12;
/*
* Count the number of points and then parse them into a point array.
* Leading arguments are assumed to be points if they start with a digit
* or a minus sign followed by a digit.
*/
for (i = 1; i < objc; i++) {
const char *arg = Tcl_GetString(objv[i]);
if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) {
break;
}
}
if (LineCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) {
goto error;
}
if (ConfigureLine(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) {
return TCL_OK;
}
error:
DeleteLine(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* LineCoords --
*
* This function is invoked to process the "coords" widget command on
* lines. See the user documentation for details on what it does.
*
* Results:
* Returns TCL_OK or TCL_ERROR, and sets the interp's result.
*
* Side effects:
* The coordinates for the given item may be changed.
*
*--------------------------------------------------------------
*/
static int
LineCoords(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item whose coordinates are to be read or
* modified. */
int objc, /* Number of coordinates supplied in objv. */
Tcl_Obj *const objv[]) /* Array of coordinates: x1, y1, x2, y2, ... */
{
LineItem *linePtr = (LineItem *) itemPtr;
int i, numPoints;
double *coordPtr;
if (objc == 0) {
int numCoords;
Tcl_Obj *subobj, *obj = Tcl_NewObj();
numCoords = 2*linePtr->numPoints;
if (linePtr->firstArrowPtr != NULL) {
coordPtr = linePtr->firstArrowPtr;
} else {
coordPtr = linePtr->coordPtr;
}
for (i = 0; i < numCoords; i++, coordPtr++) {
if (i == 2) {
coordPtr = linePtr->coordPtr+2;
}
if ((linePtr->lastArrowPtr != NULL) && (i == (numCoords-2))) {
coordPtr = linePtr->lastArrowPtr;
}
subobj = Tcl_NewDoubleObj(*coordPtr);
Tcl_ListObjAppendElement(interp, obj, subobj);
}
Tcl_SetObjResult(interp, obj);
return TCL_OK;
}
if (objc == 1) {
if (Tcl_ListObjGetElements(interp, objv[0], &objc,
(Tcl_Obj ***) &objv) != TCL_OK) {
return TCL_ERROR;
}
}
if (objc & 1) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"wrong # coordinates: expected an even number, got %d",
objc));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "LINE", NULL);
return TCL_ERROR;
} else if (objc < 4) {
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"wrong # coordinates: expected at least 4, got %d", objc));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "COORDS", "LINE", NULL);
return TCL_ERROR;
}
numPoints = objc/2;
if (linePtr->numPoints != numPoints) {
coordPtr = ckalloc(sizeof(double) * objc);
if (linePtr->coordPtr != NULL) {
ckfree(linePtr->coordPtr);
}
linePtr->coordPtr = coordPtr;
linePtr->numPoints = numPoints;
}
coordPtr = linePtr->coordPtr;
for (i = 0; i < objc ; i++) {
if (Tk_CanvasGetCoordFromObj(interp, canvas, objv[i],
coordPtr++) != TCL_OK) {
return TCL_ERROR;
}
}
/*
* Update arrowheads by throwing away any existing arrow-head information
* and calling ConfigureArrows to recompute it.
*/
if (linePtr->firstArrowPtr != NULL) {
ckfree(linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
ckfree(linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
ComputeLineBbox(canvas, linePtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* ConfigureLine --
*
* This function is invoked to configure various aspects of a line item
* such as its background color.
*
* Results:
* A standard Tcl result code. If an error occurs, then an error message
* is left in the interp's result.
*
* Side effects:
* Configuration information, such as colors and stipple patterns, may be
* set for itemPtr.
*
*--------------------------------------------------------------
*/
static int
ConfigureLine(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Line item to reconfigure. */
int objc, /* Number of elements in objv. */
Tcl_Obj *const objv[], /* Arguments describing things to configure. */
int flags) /* Flags to pass to Tk_ConfigureWidget. */
{
LineItem *linePtr = (LineItem *) itemPtr;
XGCValues gcValues;
GC newGC, arrowGC;
unsigned long mask;
Tk_Window tkwin;
Tk_State state;
tkwin = Tk_CanvasTkwin(canvas);
if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc,
(const char **) objv, (char *) linePtr, flags|TK_CONFIG_OBJS)) {
return TCL_ERROR;
}
/*
* A few of the options require additional processing, such as graphics
* contexts.
*/
state = itemPtr->state;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
if (linePtr->outline.activeWidth > linePtr->outline.width ||
linePtr->outline.activeDash.number != 0 ||
linePtr->outline.activeColor != NULL ||
linePtr->outline.activeStipple != None) {
itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT;
} else {
itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT;
}
mask = Tk_ConfigOutlineGC(&gcValues, canvas, itemPtr, &linePtr->outline);
if (mask) {
if (linePtr->arrow == ARROWS_NONE) {
gcValues.cap_style = linePtr->capStyle;
mask |= GCCapStyle;
}
gcValues.join_style = linePtr->joinStyle;
mask |= GCJoinStyle;
newGC = Tk_GetGC(tkwin, mask, &gcValues);
#ifdef MAC_OSX_TK
/*
* Mac OS X CG drawing needs access to linewidth even for arrow fills
* (as linewidth controls antialiasing).
*/
mask |= GCLineWidth;
#else
gcValues.line_width = 0;
#endif
arrowGC = Tk_GetGC(tkwin, mask, &gcValues);
} else {
newGC = arrowGC = NULL;
}
if (linePtr->outline.gc != NULL) {
Tk_FreeGC(Tk_Display(tkwin), linePtr->outline.gc);
}
if (linePtr->arrowGC != NULL) {
Tk_FreeGC(Tk_Display(tkwin), linePtr->arrowGC);
}
linePtr->outline.gc = newGC;
linePtr->arrowGC = arrowGC;
/*
* Keep spline parameters within reasonable limits.
*/
if (linePtr->splineSteps < 1) {
linePtr->splineSteps = 1;
} else if (linePtr->splineSteps > 100) {
linePtr->splineSteps = 100;
}
if ((!linePtr->numPoints) || (state == TK_STATE_HIDDEN)) {
ComputeLineBbox(canvas, linePtr);
return TCL_OK;
}
/*
* Setup arrowheads, if needed. If arrowheads are turned off, restore the
* line's endpoints (they were shortened when the arrowheads were added).
*/
if ((linePtr->firstArrowPtr != NULL) && (linePtr->arrow != ARROWS_FIRST)
&& (linePtr->arrow != ARROWS_BOTH)) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
ckfree(linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if ((linePtr->lastArrowPtr != NULL) && (linePtr->arrow != ARROWS_LAST)
&& (linePtr->arrow != ARROWS_BOTH)) {
int i;
i = 2*(linePtr->numPoints-1);
linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
ckfree(linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
/*
* Recompute bounding box for line.
*/
ComputeLineBbox(canvas, linePtr);
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* DeleteLine --
*
* This function is called to clean up the data structure associated with
* a line item.
*
* Results:
* None.
*
* Side effects:
* Resources associated with itemPtr are released.
*
*--------------------------------------------------------------
*/
static void
DeleteLine(
Tk_Canvas canvas, /* Info about overall canvas widget. */
Tk_Item *itemPtr, /* Item that is being deleted. */
Display *display) /* Display containing window for canvas. */
{
LineItem *linePtr = (LineItem *) itemPtr;
Tk_DeleteOutline(display, &linePtr->outline);
if (linePtr->coordPtr != NULL) {
ckfree(linePtr->coordPtr);
}
if (linePtr->arrowGC != NULL) {
Tk_FreeGC(display, linePtr->arrowGC);
}
if (linePtr->firstArrowPtr != NULL) {
ckfree(linePtr->firstArrowPtr);
}
if (linePtr->lastArrowPtr != NULL) {
ckfree(linePtr->lastArrowPtr);
}
}
/*
*--------------------------------------------------------------
*
* ComputeLineBbox --
*
* This function is invoked to compute the bounding box of all the pixels
* that may be drawn as part of a line.
*
* Results:
* None.
*
* Side effects:
* The fields x1, y1, x2, and y2 are updated in the header for itemPtr.
*
*--------------------------------------------------------------
*/
static void
ComputeLineBbox(
Tk_Canvas canvas, /* Canvas that contains item. */
LineItem *linePtr) /* Item whose bbos is to be recomputed. */
{
double *coordPtr;
int i, intWidth;
double width;
Tk_State state = linePtr->header.state;
Tk_TSOffset *tsoffset;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
if (!(linePtr->numPoints) || (state == TK_STATE_HIDDEN)) {
linePtr->header.x1 = -1;
linePtr->header.x2 = -1;
linePtr->header.y1 = -1;
linePtr->header.y2 = -1;
return;
}
width = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == (Tk_Item *)linePtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
}
coordPtr = linePtr->coordPtr;
linePtr->header.x1 = linePtr->header.x2 = (int) coordPtr[0];
linePtr->header.y1 = linePtr->header.y2 = (int) coordPtr[1];
/*
* Compute the bounding box of all the points in the line, then expand in
* all directions by the line's width to take care of butting or rounded
* corners and projecting or rounded caps. This expansion is an
* overestimate (worst-case is square root of two over two) but it's
* simple. Don't do anything special for curves. This causes an additional
* overestimate in the bounding box, but is faster.
*/
for (i = 1, coordPtr = linePtr->coordPtr+2; i < linePtr->numPoints;
i++, coordPtr += 2) {
TkIncludePoint((Tk_Item *) linePtr, coordPtr);
}
width = linePtr->outline.width;
if (width < 1.0) {
width = 1.0;
}
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
TkIncludePoint((Tk_Item *) linePtr, linePtr->firstArrowPtr);
}
if (linePtr->arrow != ARROWS_FIRST) {
TkIncludePoint((Tk_Item *) linePtr, linePtr->lastArrowPtr);
}
}
tsoffset = &linePtr->outline.tsoffset;
if (tsoffset->flags & TK_OFFSET_INDEX) {
double *coordPtr = linePtr->coordPtr
+ (tsoffset->flags & ~TK_OFFSET_INDEX);
if (tsoffset->flags <= 0) {
coordPtr = linePtr->coordPtr;
if ((linePtr->arrow == ARROWS_FIRST)
|| (linePtr->arrow == ARROWS_BOTH)) {
coordPtr = linePtr->firstArrowPtr;
}
}
if (tsoffset->flags > (linePtr->numPoints * 2)) {
coordPtr = linePtr->coordPtr + (linePtr->numPoints * 2);
if ((linePtr->arrow == ARROWS_LAST)
|| (linePtr->arrow == ARROWS_BOTH)) {
coordPtr = linePtr->lastArrowPtr;
}
}
tsoffset->xoffset = (int) (coordPtr[0] + 0.5);
tsoffset->yoffset = (int) (coordPtr[1] + 0.5);
} else {
if (tsoffset->flags & TK_OFFSET_LEFT) {
tsoffset->xoffset = linePtr->header.x1;
} else if (tsoffset->flags & TK_OFFSET_CENTER) {
tsoffset->xoffset = (linePtr->header.x1 + linePtr->header.x2)/2;
} else if (tsoffset->flags & TK_OFFSET_RIGHT) {
tsoffset->xoffset = linePtr->header.x2;
}
if (tsoffset->flags & TK_OFFSET_TOP) {
tsoffset->yoffset = linePtr->header.y1;
} else if (tsoffset->flags & TK_OFFSET_MIDDLE) {
tsoffset->yoffset = (linePtr->header.y1 + linePtr->header.y2)/2;
} else if (tsoffset->flags & TK_OFFSET_BOTTOM) {
tsoffset->yoffset = linePtr->header.y2;
}
}
intWidth = (int) (width + 0.5);
linePtr->header.x1 -= intWidth;
linePtr->header.x2 += intWidth;
linePtr->header.y1 -= intWidth;
linePtr->header.y2 += intWidth;
if (linePtr->numPoints == 1) {
linePtr->header.x1 -= 1;
linePtr->header.x2 += 1;
linePtr->header.y1 -= 1;
linePtr->header.y2 += 1;
return;
}
/*
* For mitered lines, make a second pass through all the points. Compute
* the locations of the two miter vertex points and add those into the
* bounding box.
*/
if (linePtr->joinStyle == JoinMiter) {
for (i = linePtr->numPoints, coordPtr = linePtr->coordPtr; i >= 3;
i--, coordPtr += 2) {
double miter[4];
int j;
if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
width, miter, miter+2)) {
for (j = 0; j < 4; j += 2) {
TkIncludePoint((Tk_Item *) linePtr, miter+j);
}
}
}
}
/*
* Add in the sizes of arrowheads, if any.
*/
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint((Tk_Item *) linePtr, coordPtr);
}
}
if (linePtr->arrow != ARROWS_FIRST) {
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint((Tk_Item *) linePtr, coordPtr);
}
}
}
/*
* Add one more pixel of fudge factor just to be safe (e.g. X may round
* differently than we do).
*/
linePtr->header.x1 -= 1;
linePtr->header.x2 += 1;
linePtr->header.y1 -= 1;
linePtr->header.y2 += 1;
}
/*
*--------------------------------------------------------------
*
* DisplayLine --
*
* This function is invoked to draw a line item in a given drawable.
*
* Results:
* None.
*
* Side effects:
* ItemPtr is drawn in drawable using the transformation information in
* canvas.
*
*--------------------------------------------------------------
*/
static void
DisplayLine(
Tk_Canvas canvas, /* Canvas that contains item. */
Tk_Item *itemPtr, /* Item to be displayed. */
Display *display, /* Display on which to draw item. */
Drawable drawable, /* Pixmap or window in which to draw item. */
int x, int y, int width, int height)
/* Describes region of canvas that must be
* redisplayed (not used). */
{
LineItem *linePtr = (LineItem *) itemPtr;
XPoint staticPoints[MAX_STATIC_POINTS*3];
XPoint *pointPtr;
double linewidth;
int numPoints;
Tk_State state = itemPtr->state;
if (!linePtr->numPoints || (linePtr->outline.gc == NULL)) {
return;
}
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
linewidth = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth != linewidth) {
linewidth = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth != linewidth) {
linewidth = linePtr->outline.disabledWidth;
}
}
/*
* Build up an array of points in screen coordinates. Use a static array
* unless the line has an enormous number of points; in this case,
* dynamically allocate an array. For smoothed lines, generate the curve
* points on each redisplay.
*/
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, NULL,
linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
} else {
numPoints = linePtr->numPoints;
}
if (numPoints <= MAX_STATIC_POINTS) {
pointPtr = staticPoints;
} else {
pointPtr = ckalloc(numPoints * 3 * sizeof(XPoint));
}
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, pointPtr, NULL);
} else {
numPoints = TkCanvTranslatePath((TkCanvas *) canvas, numPoints,
linePtr->coordPtr, 0, pointPtr);
}
/*
* Display line, the free up line storage if it was dynamically allocated.
* If we're stippling, then modify the stipple offset in the GC. Be sure
* to reset the offset when done, since the GC is supposed to be
* read-only.
*/
if (Tk_ChangeOutlineGC(canvas, itemPtr, &linePtr->outline)) {
Tk_CanvasSetOffset(canvas, linePtr->arrowGC,
&linePtr->outline.tsoffset);
}
if (numPoints > 1) {
XDrawLines(display, drawable, linePtr->outline.gc, pointPtr, numPoints,
CoordModeOrigin);
} else {
int intwidth = (int) (linewidth + 0.5);
if (intwidth < 1) {
intwidth = 1;
}
XFillArc(display, drawable, linePtr->outline.gc,
pointPtr->x - intwidth/2, pointPtr->y - intwidth/2,
(unsigned) intwidth+1, (unsigned) intwidth+1, 0, 64*360);
}
if (pointPtr != staticPoints) {
ckfree(pointPtr);
}
/*
* Display arrowheads, if they are wanted.
*/
if (linePtr->firstArrowPtr != NULL) {
TkFillPolygon(canvas, linePtr->firstArrowPtr, PTS_IN_ARROW,
display, drawable, linePtr->arrowGC, NULL);
}
if (linePtr->lastArrowPtr != NULL) {
TkFillPolygon(canvas, linePtr->lastArrowPtr, PTS_IN_ARROW,
display, drawable, linePtr->arrowGC, NULL);
}
if (Tk_ResetOutlineGC(canvas, itemPtr, &linePtr->outline)) {
XSetTSOrigin(display, linePtr->arrowGC, 0, 0);
}
}
/*
*--------------------------------------------------------------
*
* LineInsert --
*
* Insert coords into a line item at a given index.
*
* Results:
* None.
*
* Side effects:
* The coords in the given item is modified.
*
*--------------------------------------------------------------
*/
static void
LineInsert(
Tk_Canvas canvas, /* Canvas containing text item. */
Tk_Item *itemPtr, /* Line item to be modified. */
int beforeThis, /* Index before which new coordinates are to
* be inserted. */
Tcl_Obj *obj) /* New coordinates to be inserted. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int length, objc, i;
double *newCoordPtr, *coordPtr;
Tk_State state = itemPtr->state;
Tcl_Obj **objv;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
if (!obj || (Tcl_ListObjGetElements(NULL, obj, &objc, &objv) != TCL_OK)
|| !objc || objc&1) {
return;
}
length = 2*linePtr->numPoints;
if (beforeThis < 0) {
beforeThis = 0;
}
if (beforeThis > length) {
beforeThis = length;
}
if (linePtr->firstArrowPtr != NULL) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
}
if (linePtr->lastArrowPtr != NULL) {
linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
}
newCoordPtr = ckalloc(sizeof(double) * (length + objc));
for (i=0; i<beforeThis; i++) {
newCoordPtr[i] = linePtr->coordPtr[i];
}
for (i=0; i<objc; i++) {
if (Tcl_GetDoubleFromObj(NULL, objv[i],
&newCoordPtr[i + beforeThis]) != TCL_OK) {
Tcl_ResetResult(Canvas(canvas)->interp);
ckfree(newCoordPtr);
return;
}
}
for (i=beforeThis; i<length; i++) {
newCoordPtr[i+objc] = linePtr->coordPtr[i];
}
if (linePtr->coordPtr) {
ckfree(linePtr->coordPtr);
}
linePtr->coordPtr = newCoordPtr;
length += objc ;
linePtr->numPoints = length / 2;
if ((length > 3) && (state != TK_STATE_HIDDEN)) {
/*
* This is some optimizing code that will result that only the part of
* the polygon that changed (and the objects that are overlapping with
* that part) need to be redrawn. A special flag is set that instructs
* the general canvas code not to redraw the whole object. If this
* flag is not set, the canvas will do the redrawing, otherwise I have
* to do it here.
*/
itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
if (beforeThis > 0) {
beforeThis -= 2;
objc += 2;
}
if (beforeThis+objc < length) {
objc += 2;
}
if (linePtr->smooth) {
if (beforeThis > 0) {
beforeThis -= 2;
objc += 2;
}
if (beforeThis+objc+2 < length) {
objc += 2;
}
}
itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[beforeThis];
itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[beforeThis+1];
if ((linePtr->firstArrowPtr != NULL) && (beforeThis < 1)) {
/*
* Include old first arrow.
*/
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && (beforeThis+objc >= length)) {
/*
* Include old last arrow.
*/
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
coordPtr = linePtr->coordPtr + beforeThis + 2;
for (i=2; i<objc; i+=2) {
TkIncludePoint(itemPtr, coordPtr);
coordPtr += 2;
}
}
if (linePtr->firstArrowPtr != NULL) {
ckfree(linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
ckfree(linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
if (itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
double width;
int intWidth;
if ((linePtr->firstArrowPtr != NULL) && (beforeThis > 2)) {
/*
* Include new first arrow.
*/
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && (beforeThis+objc < length-2)) {
/*
* Include new right arrow.
*/
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
width = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
}
intWidth = (int) (width + 0.5);
if (intWidth < 1) {
intWidth = 1;
}
itemPtr->x1 -= intWidth;
itemPtr->y1 -= intWidth;
itemPtr->x2 += intWidth;
itemPtr->y2 += intWidth;
Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
itemPtr->x2, itemPtr->y2);
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* LineDeleteCoords --
*
* Delete one or more coordinates from a line item.
*
* Results:
* None.
*
* Side effects:
* Characters between "first" and "last", inclusive, get deleted from
* itemPtr.
*
*--------------------------------------------------------------
*/
static void
LineDeleteCoords(
Tk_Canvas canvas, /* Canvas containing itemPtr. */
Tk_Item *itemPtr, /* Item in which to delete characters. */
int first, /* Index of first character to delete. */
int last) /* Index of last character to delete. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int count, i, first1, last1;
int length = 2*linePtr->numPoints;
double *coordPtr;
Tk_State state = itemPtr->state;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
first &= -2;
last &= -2;
if (first < 0) {
first = 0;
}
if (last >= length) {
last = length-2;
}
if (first > last) {
return;
}
if (linePtr->firstArrowPtr != NULL) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
}
if (linePtr->lastArrowPtr != NULL) {
linePtr->coordPtr[length-2] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[length-1] = linePtr->lastArrowPtr[1];
}
first1 = first;
last1 = last;
if (first1 > 0) {
first1 -= 2;
}
if (last1 < length-2) {
last1 += 2;
}
if (linePtr->smooth) {
if (first1 > 0) {
first1 -= 2;
}
if (last1 < length-2) {
last1 += 2;
}
}
if ((first1 >= 2) || (last1 < length-2)) {
/*
* This is some optimizing code that will result that only the part of
* the line that changed (and the objects that are overlapping with
* that part) need to be redrawn. A special flag is set that instructs
* the general canvas code not to redraw the whole object. If this
* flag is set, the redrawing has to be done here, otherwise the
* general Canvas code will take care of it.
*/
itemPtr->redraw_flags |= TK_ITEM_DONT_REDRAW;
itemPtr->x1 = itemPtr->x2 = (int) linePtr->coordPtr[first1];
itemPtr->y1 = itemPtr->y2 = (int) linePtr->coordPtr[first1+1];
if ((linePtr->firstArrowPtr != NULL) && (first1 < 2)) {
/*
* Include old first arrow.
*/
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && (last1 >= length-2)) {
/*
* Include old last arrow.
*/
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
coordPtr = linePtr->coordPtr+first1+2;
for (i=first1+2; i<=last1; i+=2) {
TkIncludePoint(itemPtr, coordPtr);
coordPtr += 2;
}
}
count = last + 2 - first;
for (i=last+2; i<length; i++) {
linePtr->coordPtr[i-count] = linePtr->coordPtr[i];
}
linePtr->numPoints -= count/2;
if (linePtr->firstArrowPtr != NULL) {
ckfree(linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
ckfree(linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
if (itemPtr->redraw_flags & TK_ITEM_DONT_REDRAW) {
double width;
int intWidth;
if ((linePtr->firstArrowPtr != NULL) && (first1 < 4)) {
/*
* Include new first arrow.
*/
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
if ((linePtr->lastArrowPtr != NULL) && (last1 > length-4)) {
/*
* Include new right arrow.
*/
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
TkIncludePoint(itemPtr, coordPtr);
}
}
width = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
}
intWidth = (int) (width + 0.5);
if (intWidth < 1) {
intWidth = 1;
}
itemPtr->x1 -= intWidth;
itemPtr->y1 -= intWidth;
itemPtr->x2 += intWidth;
itemPtr->y2 += intWidth;
Tk_CanvasEventuallyRedraw(canvas, itemPtr->x1, itemPtr->y1,
itemPtr->x2, itemPtr->y2);
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* LineToPoint --
*
* Computes the distance from a given point to a given line, in canvas
* units.
*
* Results:
* The return value is 0 if the point whose x and y coordinates are
* pointPtr[0] and pointPtr[1] is inside the line. If the point isn't
* inside the line then the return value is the distance from the point
* to the line.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static double
LineToPoint(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item to check against point. */
double *pointPtr) /* Pointer to x and y coordinates. */
{
Tk_State state = itemPtr->state;
LineItem *linePtr = (LineItem *) itemPtr;
double *coordPtr, *linePoints;
double staticSpace[2*MAX_STATIC_POINTS];
double poly[10];
double bestDist, dist, width;
int numPoints, count;
int changedMiterToBevel; /* Non-zero means that a mitered corner had to
* be treated as beveled after all because the
* angle was < 11 degrees. */
bestDist = 1.0e36;
/*
* Handle smoothed lines by generating an expanded set of points against
* which to do the check.
*/
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
width = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
}
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, NULL,
linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
if (numPoints <= MAX_STATIC_POINTS) {
linePoints = staticSpace;
} else {
linePoints = ckalloc(2 * numPoints * sizeof(double));
}
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, NULL, linePoints);
} else {
numPoints = linePtr->numPoints;
linePoints = linePtr->coordPtr;
}
if (width < 1.0) {
width = 1.0;
}
if (!numPoints || itemPtr->state == TK_STATE_HIDDEN) {
return bestDist;
} else if (numPoints == 1) {
bestDist = hypot(linePoints[0]-pointPtr[0], linePoints[1]-pointPtr[1])
- width/2.0;
if (bestDist < 0) {
bestDist = 0;
}
return bestDist;
}
/*
* The overall idea is to iterate through all of the edges of the line,
* computing a polygon for each edge and testing the point against that
* polygon. In addition, there are additional tests to deal with rounded
* joints and caps.
*/
changedMiterToBevel = 0;
for (count = numPoints, coordPtr = linePoints; count >= 2;
count--, coordPtr += 2) {
/*
* If rounding is done around the first point then compute the
* distance between the point and the point.
*/
if (((linePtr->capStyle == CapRound) && (count == numPoints))
|| ((linePtr->joinStyle == JoinRound)
&& (count != numPoints))) {
dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- width/2.0;
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
/*
* Compute the polygonal shape corresponding to this edge, consisting
* of two points for the first point of the edge and two points for
* the last point of the edge.
*/
if (count == numPoints) {
TkGetButtPoints(coordPtr+2, coordPtr, width,
linePtr->capStyle == CapProjecting, poly, poly+2);
} else if ((linePtr->joinStyle == JoinMiter) && !changedMiterToBevel) {
poly[0] = poly[6];
poly[1] = poly[7];
poly[2] = poly[4];
poly[3] = poly[5];
} else {
TkGetButtPoints(coordPtr+2, coordPtr, width, 0, poly, poly+2);
/*
* If this line uses beveled joints, then check the distance to a
* polygon comprising the last two points of the previous polygon
* and the first two from this polygon; this checks the wedges
* that fill the mitered joint.
*/
if ((linePtr->joinStyle == JoinBevel) || changedMiterToBevel) {
poly[8] = poly[0];
poly[9] = poly[1];
dist = TkPolygonToPoint(poly, 5, pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
changedMiterToBevel = 0;
}
}
if (count == 2) {
TkGetButtPoints(coordPtr, coordPtr+2, width,
linePtr->capStyle == CapProjecting, poly+4, poly+6);
} else if (linePtr->joinStyle == JoinMiter) {
if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4,
width, poly+4, poly+6) == 0) {
changedMiterToBevel = 1;
TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
poly+4, poly+6);
}
} else {
TkGetButtPoints(coordPtr, coordPtr+2, width, 0,
poly+4, poly+6);
}
poly[8] = poly[0];
poly[9] = poly[1];
dist = TkPolygonToPoint(poly, 5, pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
/*
* If caps are rounded, check the distance to the cap around the final end
* point of the line.
*/
if (linePtr->capStyle == CapRound) {
dist = hypot(coordPtr[0] - pointPtr[0], coordPtr[1] - pointPtr[1])
- width/2.0;
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
/*
* If there are arrowheads, check the distance to the arrowheads.
*/
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
dist = TkPolygonToPoint(linePtr->firstArrowPtr, PTS_IN_ARROW,
pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
if (linePtr->arrow != ARROWS_FIRST) {
dist = TkPolygonToPoint(linePtr->lastArrowPtr, PTS_IN_ARROW,
pointPtr);
if (dist <= 0.0) {
bestDist = 0.0;
goto done;
} else if (dist < bestDist) {
bestDist = dist;
}
}
}
done:
if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
ckfree(linePoints);
}
return bestDist;
}
/*
*--------------------------------------------------------------
*
* LineToArea --
*
* This function is called to determine whether an item lies entirely
* inside, entirely outside, or overlapping a given rectangular area.
*
* Results:
* -1 is returned if the item is entirely outside the area, 0 if it
* overlaps, and 1 if it is entirely inside the given area.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
LineToArea(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item to check against line. */
double *rectPtr)
{
LineItem *linePtr = (LineItem *) itemPtr;
double staticSpace[2*MAX_STATIC_POINTS];
double *linePoints;
int numPoints, result;
double radius, width;
Tk_State state = itemPtr->state;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
width = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
}
radius = (width+1.0)/2.0;
if ((state == TK_STATE_HIDDEN) || !linePtr->numPoints) {
return -1;
} else if (linePtr->numPoints == 1) {
double oval[4];
oval[0] = linePtr->coordPtr[0]-radius;
oval[1] = linePtr->coordPtr[1]-radius;
oval[2] = linePtr->coordPtr[0]+radius;
oval[3] = linePtr->coordPtr[1]+radius;
return TkOvalToArea(oval, rectPtr);
}
/*
* Handle smoothed lines by generating an expanded set of points against
* which to do the check.
*/
if ((linePtr->smooth) && (linePtr->numPoints > 2)) {
numPoints = linePtr->smooth->coordProc(canvas, NULL,
linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
if (numPoints <= MAX_STATIC_POINTS) {
linePoints = staticSpace;
} else {
linePoints = ckalloc(2 * numPoints * sizeof(double));
}
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, NULL, linePoints);
} else {
numPoints = linePtr->numPoints;
linePoints = linePtr->coordPtr;
}
/*
* Check the segments of the line.
*/
if (width < 1.0) {
width = 1.0;
}
result = TkThickPolyLineToArea(linePoints, numPoints, width,
linePtr->capStyle, linePtr->joinStyle, rectPtr);
if (result == 0) {
goto done;
}
/*
* Check arrowheads, if any.
*/
if (linePtr->arrow != ARROWS_NONE) {
if (linePtr->arrow != ARROWS_LAST) {
if (TkPolygonToArea(linePtr->firstArrowPtr, PTS_IN_ARROW,
rectPtr) != result) {
result = 0;
goto done;
}
}
if (linePtr->arrow != ARROWS_FIRST) {
if (TkPolygonToArea(linePtr->lastArrowPtr, PTS_IN_ARROW,
rectPtr) != result) {
result = 0;
goto done;
}
}
}
done:
if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) {
ckfree(linePoints);
}
return result;
}
/*
*--------------------------------------------------------------
*
* ScaleLine --
*
* This function is invoked to rescale a line item.
*
* Results:
* None.
*
* Side effects:
* The line referred to by itemPtr is rescaled so that the following
* transformation is applied to all point coordinates:
* x' = originX + scaleX*(x-originX)
* y' = originY + scaleY*(y-originY)
*
*--------------------------------------------------------------
*/
static void
ScaleLine(
Tk_Canvas canvas, /* Canvas containing line. */
Tk_Item *itemPtr, /* Line to be scaled. */
double originX, double originY,
/* Origin about which to scale rect. */
double scaleX, /* Amount to scale in X direction. */
double scaleY) /* Amount to scale in Y direction. */
{
LineItem *linePtr = (LineItem *) itemPtr;
double *coordPtr;
int i;
/*
* Delete any arrowheads before scaling all the points (so that the
* end-points of the line get restored).
*/
if (linePtr->firstArrowPtr != NULL) {
linePtr->coordPtr[0] = linePtr->firstArrowPtr[0];
linePtr->coordPtr[1] = linePtr->firstArrowPtr[1];
ckfree(linePtr->firstArrowPtr);
linePtr->firstArrowPtr = NULL;
}
if (linePtr->lastArrowPtr != NULL) {
int i;
i = 2*(linePtr->numPoints-1);
linePtr->coordPtr[i] = linePtr->lastArrowPtr[0];
linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1];
ckfree(linePtr->lastArrowPtr);
linePtr->lastArrowPtr = NULL;
}
for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
i++, coordPtr += 2) {
coordPtr[0] = originX + scaleX*(*coordPtr - originX);
coordPtr[1] = originY + scaleY*(coordPtr[1] - originY);
}
if (linePtr->arrow != ARROWS_NONE) {
ConfigureArrows(canvas, linePtr);
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* GetLineIndex --
*
* Parse an index into a line item and return either its value or an
* error.
*
* Results:
* A standard Tcl result. If all went well, then *indexPtr is filled in
* with the index (into itemPtr) corresponding to string. Otherwise an
* error message is left in interp->result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
GetLineIndex(
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item for which the index is being
* specified. */
Tcl_Obj *obj, /* Specification of a particular coord in
* itemPtr's line. */
int *indexPtr) /* Where to store converted index. */
{
LineItem *linePtr = (LineItem *) itemPtr;
const char *string = Tcl_GetString(obj);
if (string[0] == 'e') {
if (strncmp(string, "end", obj->length) == 0) {
*indexPtr = 2*linePtr->numPoints;
} else {
goto badIndex;
}
} else if (string[0] == '@') {
int i;
double x, y, bestDist, dist, *coordPtr;
char *end;
const char *p;
p = string+1;
x = strtod(p, &end);
if ((end == p) || (*end != ',')) {
goto badIndex;
}
p = end+1;
y = strtod(p, &end);
if ((end == p) || (*end != 0)) {
goto badIndex;
}
bestDist = 1.0e36;
coordPtr = linePtr->coordPtr;
*indexPtr = 0;
for (i=0; i<linePtr->numPoints; i++) {
dist = hypot(coordPtr[0] - x, coordPtr[1] - y);
if (dist < bestDist) {
bestDist = dist;
*indexPtr = 2*i;
}
coordPtr += 2;
}
} else {
if (Tcl_GetIntFromObj(interp, obj, indexPtr) != TCL_OK) {
goto badIndex;
}
*indexPtr &= -2; /* If index is odd, make it even. */
if (*indexPtr < 0){
*indexPtr = 0;
} else if (*indexPtr > (2*linePtr->numPoints)) {
*indexPtr = (2*linePtr->numPoints);
}
}
return TCL_OK;
/*
* Some of the paths here leave messages in interp->result, so we have to
* clear it out before storing our own message.
*/
badIndex:
Tcl_ResetResult(interp);
Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad index \"%s\"", string));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "ITEM_INDEX", "LINE", NULL);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* TranslateLine --
*
* This function is called to move a line by a given amount.
*
* Results:
* None.
*
* Side effects:
* The position of the line is offset by (xDelta, yDelta), and the
* bounding box is updated in the generic part of the item structure.
*
*--------------------------------------------------------------
*/
static void
TranslateLine(
Tk_Canvas canvas, /* Canvas containing item. */
Tk_Item *itemPtr, /* Item that is being moved. */
double deltaX, double deltaY)
/* Amount by which item is to be moved. */
{
LineItem *linePtr = (LineItem *) itemPtr;
double *coordPtr;
int i;
for (i = 0, coordPtr = linePtr->coordPtr; i < linePtr->numPoints;
i++, coordPtr += 2) {
coordPtr[0] += deltaX;
coordPtr[1] += deltaY;
}
if (linePtr->firstArrowPtr != NULL) {
for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
coordPtr[0] += deltaX;
coordPtr[1] += deltaY;
}
}
if (linePtr->lastArrowPtr != NULL) {
for (i = 0, coordPtr = linePtr->lastArrowPtr; i < PTS_IN_ARROW;
i++, coordPtr += 2) {
coordPtr[0] += deltaX;
coordPtr[1] += deltaY;
}
}
ComputeLineBbox(canvas, linePtr);
}
/*
*--------------------------------------------------------------
*
* ParseArrowShape --
*
* This function is called back during option parsing to parse arrow
* shape information.
*
* Results:
* The return value is a standard Tcl result: TCL_OK means that the arrow
* shape information was parsed ok, and TCL_ERROR means it couldn't be
* parsed.
*
* Side effects:
* Arrow information in recordPtr is updated.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
ParseArrowShape(
ClientData clientData, /* Not used. */
Tcl_Interp *interp, /* Used for error reporting. */
Tk_Window tkwin, /* Not used. */
const char *value, /* Textual specification of arrow shape. */
char *recordPtr, /* Pointer to item record in which to store
* arrow information. */
int offset) /* Offset of shape information in widget
* record. */
{
LineItem *linePtr = (LineItem *) recordPtr;
double a, b, c;
int argc;
const char **argv = NULL;
if (offset != Tk_Offset(LineItem, arrowShapeA)) {
Tcl_Panic("ParseArrowShape received bogus offset");
}
if (Tcl_SplitList(interp, (char *) value, &argc, &argv) != TCL_OK) {
goto syntaxError;
} else if (argc != 3) {
goto syntaxError;
}
if ((Tk_CanvasGetCoord(interp, linePtr->canvas, argv[0], &a) != TCL_OK)
|| (Tk_CanvasGetCoord(interp, linePtr->canvas, argv[1], &b)
!= TCL_OK)
|| (Tk_CanvasGetCoord(interp, linePtr->canvas, argv[2], &c)
!= TCL_OK)) {
goto syntaxError;
}
linePtr->arrowShapeA = (float) a;
linePtr->arrowShapeB = (float) b;
linePtr->arrowShapeC = (float) c;
ckfree(argv);
return TCL_OK;
syntaxError:
Tcl_ResetResult(interp);
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"bad arrow shape \"%s\": must be list with three numbers",
value));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "ARROW_SHAPE", NULL);
if (argv != NULL) {
ckfree(argv);
}
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* PrintArrowShape --
*
* This function is a callback invoked by the configuration code to
* return a printable value describing an arrow shape.
*
* Results:
* None.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static const char *
PrintArrowShape(
ClientData clientData, /* Not used. */
Tk_Window tkwin, /* Window associated with linePtr's widget. */
char *recordPtr, /* Pointer to item record containing current
* shape information. */
int offset, /* Offset of arrow information in record. */
Tcl_FreeProc **freeProcPtr) /* Store address of function to call to free
* string here. */
{
LineItem *linePtr = (LineItem *) recordPtr;
char *buffer = ckalloc(120);
sprintf(buffer, "%.5g %.5g %.5g", linePtr->arrowShapeA,
linePtr->arrowShapeB, linePtr->arrowShapeC);
*freeProcPtr = TCL_DYNAMIC;
return buffer;
}
/*
*--------------------------------------------------------------
*
* ArrowParseProc --
*
* This function is invoked during option processing to handle the
* "-arrow" option.
*
* Results:
* A standard Tcl return value.
*
* Side effects:
* The arrow for a given item gets replaced by the arrow indicated in the
* value argument.
*
*--------------------------------------------------------------
*/
static int
ArrowParseProc(
ClientData clientData, /* some flags.*/
Tcl_Interp *interp, /* Used for reporting errors. */
Tk_Window tkwin, /* Window containing canvas widget. */
const char *value, /* Value of option. */
char *widgRec, /* Pointer to record for item. */
int offset) /* Offset into item. */
{
int c;
size_t length;
register Arrows *arrowPtr = (Arrows *) (widgRec + offset);
if (value == NULL || *value == 0) {
*arrowPtr = ARROWS_NONE;
return TCL_OK;
}
c = value[0];
length = strlen(value);
if ((c == 'n') && (strncmp(value, "none", length) == 0)) {
*arrowPtr = ARROWS_NONE;
return TCL_OK;
}
if ((c == 'f') && (strncmp(value, "first", length) == 0)) {
*arrowPtr = ARROWS_FIRST;
return TCL_OK;
}
if ((c == 'l') && (strncmp(value, "last", length) == 0)) {
*arrowPtr = ARROWS_LAST;
return TCL_OK;
}
if ((c == 'b') && (strncmp(value, "both", length) == 0)) {
*arrowPtr = ARROWS_BOTH;
return TCL_OK;
}
Tcl_SetObjResult(interp, Tcl_ObjPrintf(
"bad arrow spec \"%s\": must be none, first, last, or both",
value));
Tcl_SetErrorCode(interp, "TK", "CANVAS", "ARROW", NULL);
*arrowPtr = ARROWS_NONE;
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ArrowPrintProc --
*
* This function is invoked by the Tk configuration code to produce a
* printable string for the "-arrow" configuration option.
*
* Results:
* The return value is a string describing the arrows for the item
* referred to by "widgRec". In addition, *freeProcPtr is filled in with
* the address of a function to call to free the result string when it's
* no longer needed (or NULL to indicate that the string doesn't need to
* be freed).
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static const char *
ArrowPrintProc(
ClientData clientData, /* Ignored. */
Tk_Window tkwin, /* Window containing canvas widget. */
char *widgRec, /* Pointer to record for item. */
int offset, /* Offset into item. */
Tcl_FreeProc **freeProcPtr) /* Pointer to variable to fill in with
* information about how to reclaim storage
* for return string. */
{
register Arrows *arrowPtr = (Arrows *) (widgRec + offset);
switch (*arrowPtr) {
case ARROWS_FIRST:
return "first";
case ARROWS_LAST:
return "last";
case ARROWS_BOTH:
return "both";
default:
return "none";
}
}
/*
*--------------------------------------------------------------
*
* ConfigureArrows --
*
* If arrowheads have been requested for a line, this function makes
* arrangements for the arrowheads.
*
* Results:
* Always returns TCL_OK.
*
* Side effects:
* Information in linePtr is set up for one or two arrowheads. The
* firstArrowPtr and lastArrowPtr polygons are allocated and initialized,
* if need be, and the end points of the line are adjusted so that a
* thick line doesn't stick out past the arrowheads.
*
*--------------------------------------------------------------
*/
/* ARGSUSED */
static int
ConfigureArrows(
Tk_Canvas canvas, /* Canvas in which arrows will be displayed
* (interp and tkwin fields are needed). */
LineItem *linePtr) /* Item to configure for arrows. */
{
double *poly, *coordPtr;
double dx, dy, length, sinTheta, cosTheta, temp;
double fracHeight; /* Line width as fraction of arrowhead
* width. */
double backup; /* Distance to backup end points so the line
* ends in the middle of the arrowhead. */
double vertX, vertY; /* Position of arrowhead vertex. */
double shapeA, shapeB, shapeC;
/* Adjusted coordinates (see explanation
* below). */
double width;
Tk_State state = linePtr->header.state;
if (linePtr->numPoints < 2) {
return TCL_OK;
}
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
width = linePtr->outline.width;
if (Canvas(canvas)->currentItemPtr == (Tk_Item *)linePtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
}
/*
* The code below makes a tiny increase in the shape parameters for the
* line. This is a bit of a hack, but it seems to result in displays that
* more closely approximate the specified parameters. Without the
* adjustment, the arrows come out smaller than expected.
*/
shapeA = linePtr->arrowShapeA + 0.001;
shapeB = linePtr->arrowShapeB + 0.001;
shapeC = linePtr->arrowShapeC + width/2.0 + 0.001;
/*
* If there's an arrowhead on the first point of the line, compute its
* polygon and adjust the first point of the line so that the line doesn't
* stick out past the leading edge of the arrowhead.
*/
fracHeight = (width/2.0)/shapeC;
backup = fracHeight*shapeB + shapeA*(1.0 - fracHeight)/2.0;
if (linePtr->arrow != ARROWS_LAST) {
poly = linePtr->firstArrowPtr;
if (poly == NULL) {
poly = ckalloc(2 * PTS_IN_ARROW * sizeof(double));
poly[0] = poly[10] = linePtr->coordPtr[0];
poly[1] = poly[11] = linePtr->coordPtr[1];
linePtr->firstArrowPtr = poly;
}
dx = poly[0] - linePtr->coordPtr[2];
dy = poly[1] - linePtr->coordPtr[3];
length = hypot(dx, dy);
if (length == 0) {
sinTheta = cosTheta = 0.0;
} else {
sinTheta = dy/length;
cosTheta = dx/length;
}
vertX = poly[0] - shapeA*cosTheta;
vertY = poly[1] - shapeA*sinTheta;
temp = shapeC*sinTheta;
poly[2] = poly[0] - shapeB*cosTheta + temp;
poly[8] = poly[2] - 2*temp;
temp = shapeC*cosTheta;
poly[3] = poly[1] - shapeB*sinTheta - temp;
poly[9] = poly[3] + 2*temp;
poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
/*
* Polygon done. Now move the first point towards the second so that
* the corners at the end of the line are inside the arrowhead.
*/
linePtr->coordPtr[0] = poly[0] - backup*cosTheta;
linePtr->coordPtr[1] = poly[1] - backup*sinTheta;
}
/*
* Similar arrowhead calculation for the last point of the line.
*/
if (linePtr->arrow != ARROWS_FIRST) {
coordPtr = linePtr->coordPtr + 2*(linePtr->numPoints-2);
poly = linePtr->lastArrowPtr;
if (poly == NULL) {
poly = ckalloc(2 * PTS_IN_ARROW * sizeof(double));
poly[0] = poly[10] = coordPtr[2];
poly[1] = poly[11] = coordPtr[3];
linePtr->lastArrowPtr = poly;
}
dx = poly[0] - coordPtr[0];
dy = poly[1] - coordPtr[1];
length = hypot(dx, dy);
if (length == 0) {
sinTheta = cosTheta = 0.0;
} else {
sinTheta = dy/length;
cosTheta = dx/length;
}
vertX = poly[0] - shapeA*cosTheta;
vertY = poly[1] - shapeA*sinTheta;
temp = shapeC * sinTheta;
poly[2] = poly[0] - shapeB*cosTheta + temp;
poly[8] = poly[2] - 2*temp;
temp = shapeC * cosTheta;
poly[3] = poly[1] - shapeB*sinTheta - temp;
poly[9] = poly[3] + 2*temp;
poly[4] = poly[2]*fracHeight + vertX*(1.0-fracHeight);
poly[5] = poly[3]*fracHeight + vertY*(1.0-fracHeight);
poly[6] = poly[8]*fracHeight + vertX*(1.0-fracHeight);
poly[7] = poly[9]*fracHeight + vertY*(1.0-fracHeight);
coordPtr[2] = poly[0] - backup*cosTheta;
coordPtr[3] = poly[1] - backup*sinTheta;
}
return TCL_OK;
}
/*
*--------------------------------------------------------------
*
* LineToPostscript --
*
* This function is called to generate Postscript for line items.
*
* Results:
* The return value is a standard Tcl result. If an error occurs in
* generating Postscript then an error message is left in the interp's
* result, replacing whatever used to be there. If no error occurs, then
* Postscript for the item is appended to the result.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
LineToPostscript(
Tcl_Interp *interp, /* Leave Postscript or error message here. */
Tk_Canvas canvas, /* Information about overall canvas. */
Tk_Item *itemPtr, /* Item for which Postscript is wanted. */
int prepass) /* 1 means this is a prepass to collect font
* information; 0 means final Postscript is
* being created. */
{
LineItem *linePtr = (LineItem *) itemPtr;
int style;
double width;
XColor *color;
Pixmap stipple;
Tk_State state = itemPtr->state;
Tcl_Obj *psObj;
Tcl_InterpState interpState;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
width = linePtr->outline.width;
color = linePtr->outline.color;
stipple = linePtr->outline.stipple;
if (Canvas(canvas)->currentItemPtr == itemPtr) {
if (linePtr->outline.activeWidth > width) {
width = linePtr->outline.activeWidth;
}
if (linePtr->outline.activeColor != NULL) {
color = linePtr->outline.activeColor;
}
if (linePtr->outline.activeStipple != None) {
stipple = linePtr->outline.activeStipple;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.disabledWidth > 0) {
width = linePtr->outline.disabledWidth;
}
if (linePtr->outline.disabledColor != NULL) {
color = linePtr->outline.disabledColor;
}
if (linePtr->outline.disabledStipple != None) {
stipple = linePtr->outline.disabledStipple;
}
}
if (color == NULL || linePtr->numPoints < 1 || linePtr->coordPtr == NULL){
return TCL_OK;
}
/*
* Make our working space.
*/
psObj = Tcl_NewObj();
interpState = Tcl_SaveInterpState(interp, TCL_OK);
/*
* Check if we're just doing a "pixel".
*/
if (linePtr->numPoints == 1) {
Tcl_AppendToObj(psObj, "matrix currentmatrix\n", -1);
Tcl_AppendPrintfToObj(psObj, "%.15g %.15g translate %.15g %.15g",
linePtr->coordPtr[0], Tk_CanvasPsY(canvas, linePtr->coordPtr[1]),
width/2.0, width/2.0);
Tcl_AppendToObj(psObj,
" scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n", -1);
Tcl_ResetResult(interp);
if (Tk_CanvasPsColor(interp, canvas, color) != TCL_OK) {
goto error;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
if (stipple != None) {
Tcl_AppendToObj(psObj, "clip ", -1);
Tcl_ResetResult(interp);
if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
goto error;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
} else {
Tcl_AppendToObj(psObj, "fill\n", -1);
}
goto done;
}
/*
* Generate a path for the line's center-line (do this differently for
* straight lines and smoothed lines).
*/
Tcl_ResetResult(interp);
if ((!linePtr->smooth) || (linePtr->numPoints < 3)) {
Tk_CanvasPsPath(interp, canvas, linePtr->coordPtr, linePtr->numPoints);
} else if ((stipple == None) && linePtr->smooth->postscriptProc) {
linePtr->smooth->postscriptProc(interp, canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps);
} else {
/*
* Special hack: Postscript printers don't appear to be able to turn a
* path drawn with "curveto"s into a clipping path without exceeding
* resource limits, so TkMakeBezierPostscript won't work for stippled
* curves. Instead, generate all of the intermediate points here and
* output them into the Postscript file with "lineto"s instead.
*/
double staticPoints[2*MAX_STATIC_POINTS];
double *pointPtr;
int numPoints;
numPoints = linePtr->smooth->coordProc(canvas, NULL,
linePtr->numPoints, linePtr->splineSteps, NULL, NULL);
pointPtr = staticPoints;
if (numPoints > MAX_STATIC_POINTS) {
pointPtr = ckalloc(numPoints * 2 * sizeof(double));
}
numPoints = linePtr->smooth->coordProc(canvas, linePtr->coordPtr,
linePtr->numPoints, linePtr->splineSteps, NULL, pointPtr);
Tk_CanvasPsPath(interp, canvas, pointPtr, numPoints);
if (pointPtr != staticPoints) {
ckfree(pointPtr);
}
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
/*
* Set other line-drawing parameters and stroke out the line.
*/
if (linePtr->capStyle == CapRound) {
style = 1;
} else if (linePtr->capStyle == CapProjecting) {
style = 2;
} else {
style = 0;
}
Tcl_AppendPrintfToObj(psObj, "%d setlinecap\n", style);
if (linePtr->joinStyle == JoinRound) {
style = 1;
} else if (linePtr->joinStyle == JoinBevel) {
style = 2;
} else {
style = 0;
}
Tcl_AppendPrintfToObj(psObj, "%d setlinejoin\n", style);
Tcl_ResetResult(interp);
if (Tk_CanvasPsOutline(canvas, itemPtr, &linePtr->outline) != TCL_OK) {
goto error;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
/*
* Output polygons for the arrowheads, if there are any.
*/
if (linePtr->firstArrowPtr != NULL) {
if (stipple != None) {
Tcl_AppendToObj(psObj, "grestore gsave\n", -1);
}
if (ArrowheadPostscript(interp, canvas, linePtr,
linePtr->firstArrowPtr, psObj) != TCL_OK) {
goto error;
}
}
if (linePtr->lastArrowPtr != NULL) {
if (stipple != None) {
Tcl_AppendToObj(psObj, "grestore gsave\n", -1);
}
if (ArrowheadPostscript(interp, canvas, linePtr,
linePtr->lastArrowPtr, psObj) != TCL_OK) {
goto error;
}
}
/*
* Plug the accumulated postscript back into the result.
*/
done:
(void) Tcl_RestoreInterpState(interp, interpState);
Tcl_AppendObjToObj(Tcl_GetObjResult(interp), psObj);
Tcl_DecrRefCount(psObj);
return TCL_OK;
error:
Tcl_DiscardInterpState(interpState);
Tcl_DecrRefCount(psObj);
return TCL_ERROR;
}
/*
*--------------------------------------------------------------
*
* ArrowheadPostscript --
*
* This function is called to generate Postscript for an arrowhead for a
* line item.
*
* Results:
* The return value is a standard Tcl result. If an error occurs in
* generating Postscript then an error message is left in the interp's
* result, replacing whatever used to be there. If no error occurs, then
* Postscript for the arrowhead is appended to the given object.
*
* Side effects:
* None.
*
*--------------------------------------------------------------
*/
static int
ArrowheadPostscript(
Tcl_Interp *interp, /* Leave error message here; non-error results
* will be discarded by caller. */
Tk_Canvas canvas, /* Information about overall canvas. */
LineItem *linePtr, /* Line item for which Postscript is being
* generated. */
double *arrowPtr, /* Pointer to first of five points describing
* arrowhead polygon. */
Tcl_Obj *psObj) /* Append postscript to this object. */
{
Pixmap stipple;
Tk_State state = linePtr->header.state;
if (state == TK_STATE_NULL) {
state = Canvas(canvas)->canvas_state;
}
stipple = linePtr->outline.stipple;
if (Canvas(canvas)->currentItemPtr == (Tk_Item *) linePtr) {
if (linePtr->outline.activeStipple!=None) {
stipple = linePtr->outline.activeStipple;
}
} else if (state == TK_STATE_DISABLED) {
if (linePtr->outline.activeStipple!=None) {
stipple = linePtr->outline.disabledStipple;
}
}
Tcl_ResetResult(interp);
Tk_CanvasPsPath(interp, canvas, arrowPtr, PTS_IN_ARROW);
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
if (stipple != None) {
Tcl_AppendToObj(psObj, "clip ", -1);
Tcl_ResetResult(interp);
if (Tk_CanvasPsStipple(interp, canvas, stipple) != TCL_OK) {
return TCL_ERROR;
}
Tcl_AppendObjToObj(psObj, Tcl_GetObjResult(interp));
} else {
Tcl_AppendToObj(psObj, "fill\n", -1);
}
return TCL_OK;
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* End:
*/
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