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Diffstat (limited to 'generic/tkCanvLine.c')
| -rw-r--r-- | generic/tkCanvLine.c | 1623 |
1 files changed, 1623 insertions, 0 deletions
diff --git a/generic/tkCanvLine.c b/generic/tkCanvLine.c new file mode 100644 index 0000000..97cd1f5 --- /dev/null +++ b/generic/tkCanvLine.c @@ -0,0 +1,1623 @@ +/* + * tkCanvLine.c -- + * + * This file implements line items for canvas widgets. + * + * Copyright (c) 1991-1994 The Regents of the University of California. + * Copyright (c) 1994-1995 Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * SCCS: @(#) tkCanvLine.c 1.46 97/04/25 16:51:02 + */ + +#include <stdio.h> +#include "tkInt.h" +#include "tkPort.h" + +/* + * The structure below defines the record for each line item. + */ + +typedef struct LineItem { + Tk_Item header; /* Generic stuff that's the same for all + * types. MUST BE FIRST IN STRUCTURE. */ + Tk_Canvas canvas; /* Canvas containing item. Needed for + * parsing arrow shapes. */ + int numPoints; /* Number of points in line (always >= 2). */ + 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 width; /* Width of line. */ + XColor *fg; /* Foreground color for line. */ + Pixmap fillStipple; /* Stipple bitmap for filling line. */ + int capStyle; /* Cap style for line. */ + int joinStyle; /* Join style for line. */ + GC gc; /* Graphics context for filling line. */ + GC arrowGC; /* Graphics context for drawing arrowheads. */ + Tk_Uid 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. */ + int 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 procedures defined in this file: + */ + +static int ArrowheadPostscript _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, LineItem *linePtr, + double *arrowPtr)); +static void ComputeLineBbox _ANSI_ARGS_((Tk_Canvas canvas, + LineItem *linePtr)); +static int ConfigureLine _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, Tk_Item *itemPtr, int argc, + char **argv, int flags)); +static int ConfigureArrows _ANSI_ARGS_((Tk_Canvas canvas, + LineItem *linePtr)); +static int CreateLine _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, struct Tk_Item *itemPtr, + int argc, char **argv)); +static void DeleteLine _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, Display *display)); +static void DisplayLine _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, Display *display, Drawable dst, + int x, int y, int width, int height)); +static int LineCoords _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, Tk_Item *itemPtr, + int argc, char **argv)); +static int LineToArea _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double *rectPtr)); +static double LineToPoint _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double *coordPtr)); +static int LineToPostscript _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, Tk_Item *itemPtr, int prepass)); +static int ParseArrowShape _ANSI_ARGS_((ClientData clientData, + Tcl_Interp *interp, Tk_Window tkwin, char *value, + char *recordPtr, int offset)); +static char * PrintArrowShape _ANSI_ARGS_((ClientData clientData, + Tk_Window tkwin, char *recordPtr, int offset, + Tcl_FreeProc **freeProcPtr)); +static void ScaleLine _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double originX, double originY, + double scaleX, double scaleY)); +static void TranslateLine _ANSI_ARGS_((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 Tk_CustomOption arrowShapeOption = {ParseArrowShape, + PrintArrowShape, (ClientData) NULL}; +static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc, + Tk_CanvasTagsPrintProc, (ClientData) NULL +}; + +static Tk_ConfigSpec configSpecs[] = { + {TK_CONFIG_UID, "-arrow", (char *) NULL, (char *) NULL, + "none", Tk_Offset(LineItem, arrow), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_CUSTOM, "-arrowshape", (char *) NULL, (char *) NULL, + "8 10 3", Tk_Offset(LineItem, arrowShapeA), + TK_CONFIG_DONT_SET_DEFAULT, &arrowShapeOption}, + {TK_CONFIG_CAP_STYLE, "-capstyle", (char *) NULL, (char *) NULL, + "butt", Tk_Offset(LineItem, capStyle), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL, + "black", Tk_Offset(LineItem, fg), TK_CONFIG_NULL_OK}, + {TK_CONFIG_JOIN_STYLE, "-joinstyle", (char *) NULL, (char *) NULL, + "round", Tk_Offset(LineItem, joinStyle), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_BOOLEAN, "-smooth", (char *) NULL, (char *) NULL, + "0", Tk_Offset(LineItem, smooth), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL, + "12", Tk_Offset(LineItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(LineItem, fillStipple), TK_CONFIG_NULL_OK}, + {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL, + (char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption}, + {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL, + "1", Tk_Offset(LineItem, width), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, + (char *) NULL, 0, 0} +}; + +/* + * The structures below defines the line item type by means + * of procedures 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 */ + 0, /* alwaysRedraw */ + LineToPoint, /* pointProc */ + LineToArea, /* areaProc */ + LineToPostscript, /* postscriptProc */ + ScaleLine, /* scaleProc */ + TranslateLine, /* translateProc */ + (Tk_ItemIndexProc *) NULL, /* indexProc */ + (Tk_ItemCursorProc *) NULL, /* icursorProc */ + (Tk_ItemSelectionProc *) NULL, /* selectionProc */ + (Tk_ItemInsertProc *) NULL, /* insertProc */ + (Tk_ItemDCharsProc *) NULL, /* dTextProc */ + (Tk_ItemType *) NULL /* nextPtr */ +}; + +/* + * The Tk_Uid's below refer to uids for the various arrow types: + */ + +static Tk_Uid noneUid = NULL; +static Tk_Uid firstUid = NULL; +static Tk_Uid lastUid = NULL; +static Tk_Uid bothUid = 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 procedure 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 + * interp->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(interp, canvas, itemPtr, argc, argv) + 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 argc; /* Number of arguments in argv. */ + char **argv; /* Arguments describing line. */ +{ + LineItem *linePtr = (LineItem *) itemPtr; + int i; + + if (argc < 4) { + Tcl_AppendResult(interp, "wrong # args: should be \"", + Tk_PathName(Tk_CanvasTkwin(canvas)), " create ", + itemPtr->typePtr->name, " x1 y1 x2 y2 ?x3 y3 ...? ?options?\"", + (char *) NULL); + return TCL_ERROR; + } + + /* + * Carry out initialization that is needed to set defaults and to + * allow proper cleanup after errors during the the remainder of + * this procedure. + */ + + linePtr->canvas = canvas; + linePtr->numPoints = 0; + linePtr->coordPtr = NULL; + linePtr->width = 1; + linePtr->fg = None; + linePtr->fillStipple = None; + linePtr->capStyle = CapButt; + linePtr->joinStyle = JoinRound; + linePtr->gc = None; + linePtr->arrowGC = None; + if (noneUid == NULL) { + noneUid = Tk_GetUid("none"); + firstUid = Tk_GetUid("first"); + lastUid = Tk_GetUid("last"); + bothUid = Tk_GetUid("both"); + } + linePtr->arrow = noneUid; + linePtr->arrowShapeA = (float)8.0; + linePtr->arrowShapeB = (float)10.0; + linePtr->arrowShapeC = (float)3.0; + linePtr->firstArrowPtr = NULL; + linePtr->lastArrowPtr = NULL; + linePtr->smooth = 0; + 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 = 4; i < (argc-1); i+=2) { + if ((!isdigit(UCHAR(argv[i][0]))) && + ((argv[i][0] != '-') + || ((argv[i][1] != '.') && !isdigit(UCHAR(argv[i][1]))))) { + break; + } + } + if (LineCoords(interp, canvas, itemPtr, i, argv) != TCL_OK) { + goto error; + } + if (ConfigureLine(interp, canvas, itemPtr, argc-i, argv+i, 0) == TCL_OK) { + return TCL_OK; + } + + error: + DeleteLine(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas))); + return TCL_ERROR; +} + +/* + *-------------------------------------------------------------- + * + * LineCoords -- + * + * This procedure 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 interp->result. + * + * Side effects: + * The coordinates for the given item may be changed. + * + *-------------------------------------------------------------- + */ + +static int +LineCoords(interp, canvas, itemPtr, argc, argv) + 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 argc; /* Number of coordinates supplied in + * argv. */ + char **argv; /* Array of coordinates: x1, y1, + * x2, y2, ... */ +{ + LineItem *linePtr = (LineItem *) itemPtr; + char buffer[TCL_DOUBLE_SPACE]; + int i, numPoints; + + if (argc == 0) { + double *coordPtr; + int numCoords; + + 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; + } + Tcl_PrintDouble(interp, *coordPtr, buffer); + Tcl_AppendElement(interp, buffer); + } + } else if (argc < 4) { + Tcl_AppendResult(interp, + "too few coordinates for line: must have at least 4", + (char *) NULL); + return TCL_ERROR; + } else if (argc & 1) { + Tcl_AppendResult(interp, + "odd number of coordinates specified for line", + (char *) NULL); + return TCL_ERROR; + } else { + numPoints = argc/2; + if (linePtr->numPoints != numPoints) { + if (linePtr->coordPtr != NULL) { + ckfree((char *) linePtr->coordPtr); + } + linePtr->coordPtr = (double *) ckalloc((unsigned) + (sizeof(double) * argc)); + linePtr->numPoints = numPoints; + } + for (i = argc-1; i >= 0; i--) { + if (Tk_CanvasGetCoord(interp, canvas, argv[i], + &linePtr->coordPtr[i]) != 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((char *) linePtr->firstArrowPtr); + linePtr->firstArrowPtr = NULL; + } + if (linePtr->lastArrowPtr != NULL) { + ckfree((char *) linePtr->lastArrowPtr); + linePtr->lastArrowPtr = NULL; + } + if (linePtr->arrow != noneUid) { + ConfigureArrows(canvas, linePtr); + } + ComputeLineBbox(canvas, linePtr); + } + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * ConfigureLine -- + * + * This procedure 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 interp->result. + * + * Side effects: + * Configuration information, such as colors and stipple + * patterns, may be set for itemPtr. + * + *-------------------------------------------------------------- + */ + +static int +ConfigureLine(interp, canvas, itemPtr, argc, argv, flags) + Tcl_Interp *interp; /* Used for error reporting. */ + Tk_Canvas canvas; /* Canvas containing itemPtr. */ + Tk_Item *itemPtr; /* Line item to reconfigure. */ + int argc; /* Number of elements in argv. */ + char **argv; /* 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; + + tkwin = Tk_CanvasTkwin(canvas); + if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv, + (char *) linePtr, flags) != TCL_OK) { + return TCL_ERROR; + } + + /* + * A few of the options require additional processing, such as + * graphics contexts. + */ + + if (linePtr->fg == NULL) { + newGC = arrowGC = None; + } else { + gcValues.foreground = linePtr->fg->pixel; + gcValues.join_style = linePtr->joinStyle; + if (linePtr->width < 0) { + linePtr->width = 1; + } + gcValues.line_width = linePtr->width; + mask = GCForeground|GCJoinStyle|GCLineWidth; + if (linePtr->fillStipple != None) { + gcValues.stipple = linePtr->fillStipple; + gcValues.fill_style = FillStippled; + mask |= GCStipple|GCFillStyle; + } + if (linePtr->arrow == noneUid) { + gcValues.cap_style = linePtr->capStyle; + mask |= GCCapStyle; + } + newGC = Tk_GetGC(tkwin, mask, &gcValues); + gcValues.line_width = 0; + arrowGC = Tk_GetGC(tkwin, mask, &gcValues); + } + if (linePtr->gc != None) { + Tk_FreeGC(Tk_Display(tkwin), linePtr->gc); + } + if (linePtr->arrowGC != None) { + Tk_FreeGC(Tk_Display(tkwin), linePtr->arrowGC); + } + linePtr->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; + } + + /* + * 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 != firstUid) + && (linePtr->arrow != bothUid)) { + linePtr->coordPtr[0] = linePtr->firstArrowPtr[0]; + linePtr->coordPtr[1] = linePtr->firstArrowPtr[1]; + ckfree((char *) linePtr->firstArrowPtr); + linePtr->firstArrowPtr = NULL; + } + if ((linePtr->lastArrowPtr != NULL) && (linePtr->arrow != lastUid) + && (linePtr->arrow != bothUid)) { + int i; + + i = 2*(linePtr->numPoints-1); + linePtr->coordPtr[i] = linePtr->lastArrowPtr[0]; + linePtr->coordPtr[i+1] = linePtr->lastArrowPtr[1]; + ckfree((char *) linePtr->lastArrowPtr); + linePtr->lastArrowPtr = NULL; + } + if (linePtr->arrow != noneUid) { + if ((linePtr->arrow != firstUid) && (linePtr->arrow != lastUid) + && (linePtr->arrow != bothUid)) { + Tcl_AppendResult(interp, "bad arrow spec \"", + linePtr->arrow, "\": must be none, first, last, or both", + (char *) NULL); + linePtr->arrow = noneUid; + return TCL_ERROR; + } + ConfigureArrows(canvas, linePtr); + } + + /* + * Recompute bounding box for line. + */ + + ComputeLineBbox(canvas, linePtr); + + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * DeleteLine -- + * + * This procedure 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(canvas, itemPtr, display) + 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; + + if (linePtr->coordPtr != NULL) { + ckfree((char *) linePtr->coordPtr); + } + if (linePtr->fg != NULL) { + Tk_FreeColor(linePtr->fg); + } + if (linePtr->fillStipple != None) { + Tk_FreeBitmap(display, linePtr->fillStipple); + } + if (linePtr->gc != None) { + Tk_FreeGC(display, linePtr->gc); + } + if (linePtr->arrowGC != None) { + Tk_FreeGC(display, linePtr->arrowGC); + } + if (linePtr->firstArrowPtr != NULL) { + ckfree((char *) linePtr->firstArrowPtr); + } + if (linePtr->lastArrowPtr != NULL) { + ckfree((char *) linePtr->lastArrowPtr); + } +} + +/* + *-------------------------------------------------------------- + * + * ComputeLineBbox -- + * + * This procedure 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(canvas, linePtr) + Tk_Canvas canvas; /* Canvas that contains item. */ + LineItem *linePtr; /* Item whose bbos is to be + * recomputed. */ +{ + double *coordPtr; + int i, width; + + coordPtr = linePtr->coordPtr; + linePtr->header.x1 = linePtr->header.x2 = (int) *coordPtr; + 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->width; + if (width < 1) { + width = 1; + } + linePtr->header.x1 -= width; + linePtr->header.x2 += width; + linePtr->header.y1 -= width; + linePtr->header.y2 += width; + + /* + * 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, + (double) 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 != noneUid) { + if (linePtr->arrow != lastUid) { + for (i = 0, coordPtr = linePtr->firstArrowPtr; i < PTS_IN_ARROW; + i++, coordPtr += 2) { + TkIncludePoint((Tk_Item *) linePtr, coordPtr); + } + } + if (linePtr->arrow != firstUid) { + 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 procedure 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(canvas, itemPtr, display, drawable, x, y, width, height) + 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, y, width, height; /* Describes region of canvas that + * must be redisplayed (not used). */ +{ + LineItem *linePtr = (LineItem *) itemPtr; + XPoint staticPoints[MAX_STATIC_POINTS]; + XPoint *pointPtr; + XPoint *pPtr; + double *coordPtr; + int i, numPoints; + + if (linePtr->gc == None) { + return; + } + + /* + * 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 = 1 + linePtr->numPoints*linePtr->splineSteps; + } else { + numPoints = linePtr->numPoints; + } + + if (numPoints <= MAX_STATIC_POINTS) { + pointPtr = staticPoints; + } else { + pointPtr = (XPoint *) ckalloc((unsigned) (numPoints * sizeof(XPoint))); + } + + if ((linePtr->smooth) && (linePtr->numPoints > 2)) { + numPoints = TkMakeBezierCurve(canvas, linePtr->coordPtr, + linePtr->numPoints, linePtr->splineSteps, pointPtr, + (double *) NULL); + } else { + for (i = 0, coordPtr = linePtr->coordPtr, pPtr = pointPtr; + i < linePtr->numPoints; i += 1, coordPtr += 2, pPtr++) { + Tk_CanvasDrawableCoords(canvas, coordPtr[0], coordPtr[1], + &pPtr->x, &pPtr->y); + } + } + + /* + * 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 (linePtr->fillStipple != None) { + Tk_CanvasSetStippleOrigin(canvas, linePtr->gc); + Tk_CanvasSetStippleOrigin(canvas, linePtr->arrowGC); + } + XDrawLines(display, drawable, linePtr->gc, pointPtr, numPoints, + CoordModeOrigin); + if (pointPtr != staticPoints) { + ckfree((char *) pointPtr); + } + + /* + * Display arrowheads, if they are wanted. + */ + + if (linePtr->firstArrowPtr != NULL) { + TkFillPolygon(canvas, linePtr->firstArrowPtr, PTS_IN_ARROW, + display, drawable, linePtr->gc, NULL); + } + if (linePtr->lastArrowPtr != NULL) { + TkFillPolygon(canvas, linePtr->lastArrowPtr, PTS_IN_ARROW, + display, drawable, linePtr->gc, NULL); + } + if (linePtr->fillStipple != None) { + XSetTSOrigin(display, linePtr->gc, 0, 0); + XSetTSOrigin(display, linePtr->arrowGC, 0, 0); + } +} + +/* + *-------------------------------------------------------------- + * + * 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(canvas, itemPtr, pointPtr) + Tk_Canvas canvas; /* Canvas containing item. */ + Tk_Item *itemPtr; /* Item to check against point. */ + double *pointPtr; /* Pointer to x and y coordinates. */ +{ + LineItem *linePtr = (LineItem *) itemPtr; + double *coordPtr, *linePoints; + double staticSpace[2*MAX_STATIC_POINTS]; + double poly[10]; + double bestDist, dist; + 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 ((linePtr->smooth) && (linePtr->numPoints > 2)) { + numPoints = 1 + linePtr->numPoints*linePtr->splineSteps; + if (numPoints <= MAX_STATIC_POINTS) { + linePoints = staticSpace; + } else { + linePoints = (double *) ckalloc((unsigned) + (2*numPoints*sizeof(double))); + } + numPoints = TkMakeBezierCurve(canvas, linePtr->coordPtr, + linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL, + linePoints); + } else { + numPoints = linePtr->numPoints; + linePoints = linePtr->coordPtr; + } + + /* + * 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]) + - linePtr->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, (double) linePtr->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, (double) linePtr->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, (double) linePtr->width, + linePtr->capStyle == CapProjecting, poly+4, poly+6); + } else if (linePtr->joinStyle == JoinMiter) { + if (TkGetMiterPoints(coordPtr, coordPtr+2, coordPtr+4, + (double) linePtr->width, poly+4, poly+6) == 0) { + changedMiterToBevel = 1; + TkGetButtPoints(coordPtr, coordPtr+2, (double) linePtr->width, + 0, poly+4, poly+6); + } + } else { + TkGetButtPoints(coordPtr, coordPtr+2, (double) linePtr->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]) + - linePtr->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 != noneUid) { + if (linePtr->arrow != lastUid) { + 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 != firstUid) { + 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((char *) linePoints); + } + return bestDist; +} + +/* + *-------------------------------------------------------------- + * + * LineToArea -- + * + * This procedure 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(canvas, itemPtr, rectPtr) + 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; + + /* + * Handle smoothed lines by generating an expanded set of points + * against which to do the check. + */ + + if ((linePtr->smooth) && (linePtr->numPoints > 2)) { + numPoints = 1 + linePtr->numPoints*linePtr->splineSteps; + if (numPoints <= MAX_STATIC_POINTS) { + linePoints = staticSpace; + } else { + linePoints = (double *) ckalloc((unsigned) + (2*numPoints*sizeof(double))); + } + numPoints = TkMakeBezierCurve(canvas, linePtr->coordPtr, + linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL, + linePoints); + } else { + numPoints = linePtr->numPoints; + linePoints = linePtr->coordPtr; + } + + /* + * Check the segments of the line. + */ + + result = TkThickPolyLineToArea(linePoints, numPoints, + (double) linePtr->width, linePtr->capStyle, linePtr->joinStyle, + rectPtr); + if (result == 0) { + goto done; + } + + /* + * Check arrowheads, if any. + */ + + if (linePtr->arrow != noneUid) { + if (linePtr->arrow != lastUid) { + if (TkPolygonToArea(linePtr->firstArrowPtr, PTS_IN_ARROW, + rectPtr) != result) { + result = 0; + goto done; + } + } + if (linePtr->arrow != firstUid) { + if (TkPolygonToArea(linePtr->lastArrowPtr, PTS_IN_ARROW, + rectPtr) != result) { + result = 0; + goto done; + } + } + } + + done: + if ((linePoints != staticSpace) && (linePoints != linePtr->coordPtr)) { + ckfree((char *) linePoints); + } + return result; +} + +/* + *-------------------------------------------------------------- + * + * ScaleLine -- + * + * This procedure 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(canvas, itemPtr, originX, originY, scaleX, scaleY) + Tk_Canvas canvas; /* Canvas containing line. */ + Tk_Item *itemPtr; /* Line to be scaled. */ + double originX, 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((char *) 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((char *) 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 != noneUid) { + ConfigureArrows(canvas, linePtr); + } + ComputeLineBbox(canvas, linePtr); +} + +/* + *-------------------------------------------------------------- + * + * TranslateLine -- + * + * This procedure 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(canvas, itemPtr, deltaX, deltaY) + Tk_Canvas canvas; /* Canvas containing item. */ + Tk_Item *itemPtr; /* Item that is being moved. */ + double deltaX, 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 procedure 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, interp, tkwin, value, recordPtr, offset) + ClientData clientData; /* Not used. */ + Tcl_Interp *interp; /* Used for error reporting. */ + Tk_Window tkwin; /* Not used. */ + 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; + char **argv = NULL; + + if (offset != Tk_Offset(LineItem, arrowShapeA)) { + panic("ParseArrowShape received bogus offset"); + } + + if (Tcl_SplitList(interp, value, &argc, &argv) != TCL_OK) { + syntaxError: + Tcl_ResetResult(interp); + Tcl_AppendResult(interp, "bad arrow shape \"", value, + "\": must be list with three numbers", (char *) NULL); + if (argv != NULL) { + ckfree((char *) argv); + } + return TCL_ERROR; + } + 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((char *) argv); + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * PrintArrowShape -- + * + * This procedure is a callback invoked by the configuration + * code to return a printable value describing an arrow shape. + * + * Results: + * None. + * + * Side effects: + * None. + * + *-------------------------------------------------------------- + */ + + /* ARGSUSED */ +static char * +PrintArrowShape(clientData, tkwin, recordPtr, offset, freeProcPtr) + 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 procedure to call to + * free string here. */ +{ + LineItem *linePtr = (LineItem *) recordPtr; + char *buffer; + + buffer = (char *) ckalloc(120); + sprintf(buffer, "%.5g %.5g %.5g", linePtr->arrowShapeA, + linePtr->arrowShapeB, linePtr->arrowShapeC); + *freeProcPtr = TCL_DYNAMIC; + return buffer; +} + +/* + *-------------------------------------------------------------- + * + * ConfigureArrows -- + * + * If arrowheads have been requested for a line, this + * procedure 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(canvas, linePtr) + 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). */ + + /* + * 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 + linePtr->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 = (linePtr->width/2.0)/shapeC; + backup = fracHeight*shapeB + shapeA*(1.0 - fracHeight)/2.0; + if (linePtr->arrow != lastUid) { + poly = linePtr->firstArrowPtr; + if (poly == NULL) { + poly = (double *) ckalloc((unsigned) + (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 != firstUid) { + coordPtr = linePtr->coordPtr + 2*(linePtr->numPoints-2); + poly = linePtr->lastArrowPtr; + if (poly == NULL) { + poly = (double *) ckalloc((unsigned) + (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 procedure 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 interp->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(interp, canvas, itemPtr, prepass) + 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; + char buffer[200]; + char *style; + + if (linePtr->fg == NULL) { + return TCL_OK; + } + + /* + * Generate a path for the line's center-line (do this differently + * for straight lines and smoothed lines). + */ + + if ((!linePtr->smooth) || (linePtr->numPoints <= 2)) { + Tk_CanvasPsPath(interp, canvas, linePtr->coordPtr, linePtr->numPoints); + } else { + if (linePtr->fillStipple == None) { + TkMakeBezierPostscript(interp, canvas, linePtr->coordPtr, + linePtr->numPoints); + } 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 = 1 + linePtr->numPoints*linePtr->splineSteps; + pointPtr = staticPoints; + if (numPoints > MAX_STATIC_POINTS) { + pointPtr = (double *) ckalloc((unsigned) + (numPoints * 2 * sizeof(double))); + } + numPoints = TkMakeBezierCurve(canvas, linePtr->coordPtr, + linePtr->numPoints, linePtr->splineSteps, (XPoint *) NULL, + pointPtr); + Tk_CanvasPsPath(interp, canvas, pointPtr, numPoints); + if (pointPtr != staticPoints) { + ckfree((char *) pointPtr); + } + } + } + + /* + * Set other line-drawing parameters and stroke out the line. + */ + + sprintf(buffer, "%d setlinewidth\n", linePtr->width); + Tcl_AppendResult(interp, buffer, (char *) NULL); + style = "0 setlinecap\n"; + if (linePtr->capStyle == CapRound) { + style = "1 setlinecap\n"; + } else if (linePtr->capStyle == CapProjecting) { + style = "2 setlinecap\n"; + } + Tcl_AppendResult(interp, style, (char *) NULL); + style = "0 setlinejoin\n"; + if (linePtr->joinStyle == JoinRound) { + style = "1 setlinejoin\n"; + } else if (linePtr->joinStyle == JoinBevel) { + style = "2 setlinejoin\n"; + } + Tcl_AppendResult(interp, style, (char *) NULL); + if (Tk_CanvasPsColor(interp, canvas, linePtr->fg) != TCL_OK) { + return TCL_ERROR; + }; + if (linePtr->fillStipple != None) { + Tcl_AppendResult(interp, "StrokeClip ", (char *) NULL); + if (Tk_CanvasPsStipple(interp, canvas, linePtr->fillStipple) + != TCL_OK) { + return TCL_ERROR; + } + } else { + Tcl_AppendResult(interp, "stroke\n", (char *) NULL); + } + + /* + * Output polygons for the arrowheads, if there are any. + */ + + if (linePtr->firstArrowPtr != NULL) { + if (linePtr->fillStipple != None) { + Tcl_AppendResult(interp, "grestore gsave\n", + (char *) NULL); + } + if (ArrowheadPostscript(interp, canvas, linePtr, + linePtr->firstArrowPtr) != TCL_OK) { + return TCL_ERROR; + } + } + if (linePtr->lastArrowPtr != NULL) { + if (linePtr->fillStipple != None) { + Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL); + } + if (ArrowheadPostscript(interp, canvas, linePtr, + linePtr->lastArrowPtr) != TCL_OK) { + return TCL_ERROR; + } + } + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * ArrowheadPostscript -- + * + * This procedure 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 interp->result, replacing whatever used + * to be there. If no error occurs, then Postscript for the + * arrowhead is appended to the result. + * + * Side effects: + * None. + * + *-------------------------------------------------------------- + */ + +static int +ArrowheadPostscript(interp, canvas, linePtr, arrowPtr) + Tcl_Interp *interp; /* Leave Postscript or error message + * here. */ + 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. */ +{ + Tk_CanvasPsPath(interp, canvas, arrowPtr, PTS_IN_ARROW); + if (linePtr->fillStipple != None) { + Tcl_AppendResult(interp, "clip ", (char *) NULL); + if (Tk_CanvasPsStipple(interp, canvas, linePtr->fillStipple) + != TCL_OK) { + return TCL_ERROR; + } + } else { + Tcl_AppendResult(interp, "fill\n", (char *) NULL); + } + return TCL_OK; +} |