diff options
Diffstat (limited to 'tk/generic/tkCanvPoly.c')
| -rw-r--r-- | tk/generic/tkCanvPoly.c | 1000 |
1 files changed, 1000 insertions, 0 deletions
diff --git a/tk/generic/tkCanvPoly.c b/tk/generic/tkCanvPoly.c new file mode 100644 index 00000000000..79c7b6c50b4 --- /dev/null +++ b/tk/generic/tkCanvPoly.c @@ -0,0 +1,1000 @@ +/* + * tkCanvPoly.c -- + * + * This file implements polygon items for canvas widgets. + * + * Copyright (c) 1991-1994 The Regents of the University of California. + * Copyright (c) 1994-1997 Sun Microsystems, Inc. + * + * See the file "license.terms" for information on usage and redistribution + * of this file, and for a DISCLAIMER OF ALL WARRANTIES. + * + * RCS: @(#) $Id$ + */ + +#include <stdio.h> +#include "tkInt.h" +#include "tkPort.h" + +/* + * The structure below defines the record for each polygon item. + */ + +typedef struct PolygonItem { + Tk_Item header; /* Generic stuff that's the same for all + * types. MUST BE FIRST IN STRUCTURE. */ + int numPoints; /* Number of points in polygon (always >= 3). + * Polygon is always closed. */ + int pointsAllocated; /* Number of points for which space is + * allocated at *coordPtr. */ + double *coordPtr; /* Pointer to malloc-ed array containing + * x- and y-coords of all points in polygon. + * X-coords are even-valued indices, y-coords + * are corresponding odd-valued indices. */ + int width; /* Width of outline. */ + XColor *outlineColor; /* Color for outline. */ + GC outlineGC; /* Graphics context for drawing outline. */ + XColor *fillColor; /* Foreground color for polygon. */ + Pixmap fillStipple; /* Stipple bitmap for filling polygon. */ + GC fillGC; /* Graphics context for filling polygon. */ + int smooth; /* Non-zero means draw shape smoothed (i.e. + * with Bezier splines). */ + int splineSteps; /* Number of steps in each spline segment. */ + int autoClosed; /* Zero means the given polygon was closed, + one means that we auto closed it. */ +} PolygonItem; + +/* + * Information used for parsing configuration specs: + */ + +static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc, + Tk_CanvasTagsPrintProc, (ClientData) NULL +}; + +static Tk_ConfigSpec configSpecs[] = { + {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL, + "black", Tk_Offset(PolygonItem, fillColor), TK_CONFIG_NULL_OK}, + {TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(PolygonItem, outlineColor), TK_CONFIG_NULL_OK}, + {TK_CONFIG_BOOLEAN, "-smooth", (char *) NULL, (char *) NULL, + "0", Tk_Offset(PolygonItem, smooth), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_INT, "-splinesteps", (char *) NULL, (char *) NULL, + "12", Tk_Offset(PolygonItem, splineSteps), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL, + (char *) NULL, Tk_Offset(PolygonItem, 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(PolygonItem, width), TK_CONFIG_DONT_SET_DEFAULT}, + {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL, + (char *) NULL, 0, 0} +}; + +/* + * Prototypes for procedures defined in this file: + */ + +static void ComputePolygonBbox _ANSI_ARGS_((Tk_Canvas canvas, + PolygonItem *polyPtr)); +static int ConfigurePolygon _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, Tk_Item *itemPtr, int argc, + char **argv, int flags)); +static int CreatePolygon _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, struct Tk_Item *itemPtr, + int argc, char **argv)); +static void DeletePolygon _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, Display *display)); +static void DisplayPolygon _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, Display *display, Drawable dst, + int x, int y, int width, int height)); +static int PolygonCoords _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, Tk_Item *itemPtr, + int argc, char **argv)); +static int PolygonToArea _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double *rectPtr)); +static double PolygonToPoint _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double *pointPtr)); +static int PolygonToPostscript _ANSI_ARGS_((Tcl_Interp *interp, + Tk_Canvas canvas, Tk_Item *itemPtr, int prepass)); +static void ScalePolygon _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double originX, double originY, + double scaleX, double scaleY)); +static void TranslatePolygon _ANSI_ARGS_((Tk_Canvas canvas, + Tk_Item *itemPtr, double deltaX, double deltaY)); + +/* + * The structures below defines the polygon item type by means + * of procedures that can be invoked by generic item code. + */ + +Tk_ItemType tkPolygonType = { + "polygon", /* name */ + sizeof(PolygonItem), /* itemSize */ + CreatePolygon, /* createProc */ + configSpecs, /* configSpecs */ + ConfigurePolygon, /* configureProc */ + PolygonCoords, /* coordProc */ + DeletePolygon, /* deleteProc */ + DisplayPolygon, /* displayProc */ + 0, /* alwaysRedraw */ + PolygonToPoint, /* pointProc */ + PolygonToArea, /* areaProc */ + PolygonToPostscript, /* postscriptProc */ + ScalePolygon, /* scaleProc */ + TranslatePolygon, /* 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 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 + +/* + *-------------------------------------------------------------- + * + * CreatePolygon -- + * + * This procedure is invoked to create a new polygon 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 polygon item is created. + * + *-------------------------------------------------------------- + */ + +static int +CreatePolygon(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 polygon. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + int i; + + if (argc < 6) { + Tcl_AppendResult(interp, "wrong # args: should be \"", + Tk_PathName(Tk_CanvasTkwin(canvas)), " create ", + itemPtr->typePtr->name, + " x1 y1 x2 y2 x3 y3 ?x4 y4 ...? ?options?\"", (char *) NULL); + return TCL_ERROR; + } + + /* + * Carry out initialization that is needed in order to clean + * up after errors during the the remainder of this procedure. + */ + + polyPtr->numPoints = 0; + polyPtr->pointsAllocated = 0; + polyPtr->coordPtr = NULL; + polyPtr->width = 1; + polyPtr->outlineColor = NULL; + polyPtr->outlineGC = None; + polyPtr->fillColor = NULL; + polyPtr->fillStipple = None; + polyPtr->fillGC = None; + polyPtr->smooth = 0; + polyPtr->splineSteps = 12; + polyPtr->autoClosed = 0; + + /* + * 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] != '-') || (!isdigit(UCHAR(argv[i][1]))))) { + break; + } + } + if (PolygonCoords(interp, canvas, itemPtr, i, argv) != TCL_OK) { + goto error; + } + + if (ConfigurePolygon(interp, canvas, itemPtr, argc-i, argv+i, 0) + == TCL_OK) { + return TCL_OK; + } + + error: + DeletePolygon(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas))); + return TCL_ERROR; +} + +/* + *-------------------------------------------------------------- + * + * PolygonCoords -- + * + * This procedure is invoked to process the "coords" widget + * command on polygons. 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 +PolygonCoords(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, ... */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + char buffer[TCL_DOUBLE_SPACE]; + int i, numPoints; + + if (argc == 0) { + /* + * Print the coords used to create the polygon. If we auto + * closed the polygon then we don't report the last point. + */ + for (i = 0; i < 2*(polyPtr->numPoints - polyPtr->autoClosed); i++) { + Tcl_PrintDouble(interp, polyPtr->coordPtr[i], buffer); + Tcl_AppendElement(interp, buffer); + } + } else if (argc < 6) { + Tcl_AppendResult(interp, + "too few coordinates for polygon: must have at least 6", + (char *) NULL); + return TCL_ERROR; + } else if (argc & 1) { + Tcl_AppendResult(interp, + "odd number of coordinates specified for polygon", + (char *) NULL); + return TCL_ERROR; + } else { + numPoints = argc/2; + if (polyPtr->pointsAllocated <= numPoints) { + if (polyPtr->coordPtr != NULL) { + ckfree((char *) polyPtr->coordPtr); + } + + /* + * One extra point gets allocated here, just in case we have + * to add another point to close the polygon. + */ + + polyPtr->coordPtr = (double *) ckalloc((unsigned) + (sizeof(double) * (argc+2))); + polyPtr->pointsAllocated = numPoints+1; + } + for (i = argc-1; i >= 0; i--) { + if (Tk_CanvasGetCoord(interp, canvas, argv[i], + &polyPtr->coordPtr[i]) != TCL_OK) { + return TCL_ERROR; + } + } + polyPtr->numPoints = numPoints; + polyPtr->autoClosed = 0; + + /* + * Close the polygon if it isn't already closed. + */ + + if ((polyPtr->coordPtr[argc-2] != polyPtr->coordPtr[0]) + || (polyPtr->coordPtr[argc-1] != polyPtr->coordPtr[1])) { + polyPtr->autoClosed = 1; + polyPtr->numPoints++; + polyPtr->coordPtr[argc] = polyPtr->coordPtr[0]; + polyPtr->coordPtr[argc+1] = polyPtr->coordPtr[1]; + } + ComputePolygonBbox(canvas, polyPtr); + } + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * ConfigurePolygon -- + * + * This procedure is invoked to configure various aspects + * of a polygon 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 +ConfigurePolygon(interp, canvas, itemPtr, argc, argv, flags) + Tcl_Interp *interp; /* Interpreter for error reporting. */ + Tk_Canvas canvas; /* Canvas containing itemPtr. */ + Tk_Item *itemPtr; /* Polygon 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. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + XGCValues gcValues; + GC newGC; + unsigned long mask; + Tk_Window tkwin; + + tkwin = Tk_CanvasTkwin(canvas); + if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv, + (char *) polyPtr, flags) != TCL_OK) { + return TCL_ERROR; + } + + /* + * A few of the options require additional processing, such as + * graphics contexts. + */ + + if (polyPtr->width < 1) { + polyPtr->width = 1; + } + if (polyPtr->outlineColor == NULL) { + newGC = None; + } else { + gcValues.foreground = polyPtr->outlineColor->pixel; + gcValues.line_width = polyPtr->width; + gcValues.cap_style = CapRound; + gcValues.join_style = JoinRound; + mask = GCForeground|GCLineWidth|GCCapStyle|GCJoinStyle; + newGC = Tk_GetGCColor(tkwin, mask, &gcValues, polyPtr->outlineColor, + NULL); + } + if (polyPtr->outlineGC != None) { + Tk_FreeGC(Tk_Display(tkwin), polyPtr->outlineGC); + } + polyPtr->outlineGC = newGC; + + if (polyPtr->fillColor == NULL) { + newGC = None; + } else { + gcValues.foreground = polyPtr->fillColor->pixel; + mask = GCForeground; + if (polyPtr->fillStipple != None) { + gcValues.stipple = polyPtr->fillStipple; + gcValues.fill_style = FillStippled; + mask |= GCStipple|GCFillStyle; + } + newGC = Tk_GetGCColor(tkwin, mask, &gcValues, polyPtr->fillColor, + NULL); + } + if (polyPtr->fillGC != None) { + Tk_FreeGC(Tk_Display(tkwin), polyPtr->fillGC); + } + polyPtr->fillGC = newGC; + + /* + * Keep spline parameters within reasonable limits. + */ + + if (polyPtr->splineSteps < 1) { + polyPtr->splineSteps = 1; + } else if (polyPtr->splineSteps > 100) { + polyPtr->splineSteps = 100; + } + + ComputePolygonBbox(canvas, polyPtr); + return TCL_OK; +} + +/* + *-------------------------------------------------------------- + * + * DeletePolygon -- + * + * This procedure is called to clean up the data structure + * associated with a polygon item. + * + * Results: + * None. + * + * Side effects: + * Resources associated with itemPtr are released. + * + *-------------------------------------------------------------- + */ + +static void +DeletePolygon(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. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + + if (polyPtr->coordPtr != NULL) { + ckfree((char *) polyPtr->coordPtr); + } + if (polyPtr->fillColor != NULL) { + Tk_FreeColor(polyPtr->fillColor); + } + if (polyPtr->fillStipple != None) { + Tk_FreeBitmap(display, polyPtr->fillStipple); + } + if (polyPtr->outlineColor != NULL) { + Tk_FreeColor(polyPtr->outlineColor); + } + if (polyPtr->outlineGC != None) { + Tk_FreeGC(display, polyPtr->outlineGC); + } + if (polyPtr->fillGC != None) { + Tk_FreeGC(display, polyPtr->fillGC); + } +} + +/* + *-------------------------------------------------------------- + * + * ComputePolygonBbox -- + * + * This procedure is invoked to compute the bounding box of + * all the pixels that may be drawn as part of a polygon. + * + * Results: + * None. + * + * Side effects: + * The fields x1, y1, x2, and y2 are updated in the header + * for itemPtr. + * + *-------------------------------------------------------------- + */ + +static void +ComputePolygonBbox(canvas, polyPtr) + Tk_Canvas canvas; /* Canvas that contains item. */ + PolygonItem *polyPtr; /* Item whose bbox is to be + * recomputed. */ +{ + double *coordPtr; + int i; + + coordPtr = polyPtr->coordPtr; + polyPtr->header.x1 = polyPtr->header.x2 = (int) *coordPtr; + polyPtr->header.y1 = polyPtr->header.y2 = (int) coordPtr[1]; + + for (i = 1, coordPtr = polyPtr->coordPtr+2; i < polyPtr->numPoints; + i++, coordPtr += 2) { + TkIncludePoint((Tk_Item *) polyPtr, coordPtr); + } + + /* + * Expand bounding box in all directions to account for the outline, + * which can stick out beyond the polygon. Add one extra pixel of + * fudge, just in case X rounds differently than we do. + */ + + i = (polyPtr->width+1)/2 + 1; + polyPtr->header.x1 -= i; + polyPtr->header.x2 += i; + polyPtr->header.y1 -= i; + polyPtr->header.y2 += i; +} + +/* + *-------------------------------------------------------------- + * + * TkFillPolygon -- + * + * This procedure is invoked to convert a polygon to screen + * coordinates and display it using a particular GC. + * + * Results: + * None. + * + * Side effects: + * ItemPtr is drawn in drawable using the transformation + * information in canvas. + * + *-------------------------------------------------------------- + */ + +void +TkFillPolygon(canvas, coordPtr, numPoints, display, drawable, gc, outlineGC) + Tk_Canvas canvas; /* Canvas whose coordinate system + * is to be used for drawing. */ + double *coordPtr; /* Array of coordinates for polygon: + * x1, y1, x2, y2, .... */ + int numPoints; /* Twice this many coordinates are + * present at *coordPtr. */ + Display *display; /* Display on which to draw polygon. */ + Drawable drawable; /* Pixmap or window in which to draw + * polygon. */ + GC gc; /* Graphics context for drawing. */ + GC outlineGC; /* If not None, use this to draw an + * outline around the polygon after + * filling it. */ +{ + XPoint staticPoints[MAX_STATIC_POINTS]; + XPoint *pointPtr; + XPoint *pPtr; + int i; + + /* + * Build up an array of points in screen coordinates. Use a + * static array unless the polygon has an enormous number of points; + * in this case, dynamically allocate an array. + */ + + if (numPoints <= MAX_STATIC_POINTS) { + pointPtr = staticPoints; + } else { + pointPtr = (XPoint *) ckalloc((unsigned) (numPoints * sizeof(XPoint))); + } + + for (i = 0, pPtr = pointPtr; i < numPoints; i += 1, coordPtr += 2, pPtr++) { + Tk_CanvasDrawableCoords(canvas, coordPtr[0], coordPtr[1], &pPtr->x, + &pPtr->y); + } + + /* + * Display polygon, then free up polygon storage if it was dynamically + * allocated. + */ + + if (gc != None) { + XFillPolygon(display, drawable, gc, pointPtr, numPoints, Complex, + CoordModeOrigin); + } + if (outlineGC != None) { + XDrawLines(display, drawable, outlineGC, pointPtr, + numPoints, CoordModeOrigin); + } + if (pointPtr != staticPoints) { + ckfree((char *) pointPtr); + } +} + +/* + *-------------------------------------------------------------- + * + * DisplayPolygon -- + * + * This procedure is invoked to draw a polygon item in a given + * drawable. + * + * Results: + * None. + * + * Side effects: + * ItemPtr is drawn in drawable using the transformation + * information in canvas. + * + *-------------------------------------------------------------- + */ + +static void +DisplayPolygon(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). */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + + if ((polyPtr->fillGC == None) && (polyPtr->outlineGC == None)) { + return; + } + + /* + * 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 ((polyPtr->fillStipple != None) && (polyPtr->fillGC != None)) { + Tk_CanvasSetStippleOrigin(canvas, polyPtr->fillGC); + } + + if (!polyPtr->smooth) { + TkFillPolygon(canvas, polyPtr->coordPtr, polyPtr->numPoints, + display, drawable, polyPtr->fillGC, polyPtr->outlineGC); + } else { + int numPoints; + XPoint staticPoints[MAX_STATIC_POINTS]; + XPoint *pointPtr; + + /* + * This is a smoothed polygon. Display using a set of generated + * spline points rather than the original points. + */ + + numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps; + if (numPoints <= MAX_STATIC_POINTS) { + pointPtr = staticPoints; + } else { + pointPtr = (XPoint *) ckalloc((unsigned) + (numPoints * sizeof(XPoint))); + } + numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr, + polyPtr->numPoints, polyPtr->splineSteps, pointPtr, + (double *) NULL); + if (polyPtr->fillGC != None) { + XFillPolygon(display, drawable, polyPtr->fillGC, pointPtr, + numPoints, Complex, CoordModeOrigin); + } + if (polyPtr->outlineGC != None) { + XDrawLines(display, drawable, polyPtr->outlineGC, pointPtr, + numPoints, CoordModeOrigin); + } + if (pointPtr != staticPoints) { + ckfree((char *) pointPtr); + } + } + if ((polyPtr->fillStipple != None) && (polyPtr->fillGC != None)) { + XSetTSOrigin(display, polyPtr->fillGC, 0, 0); + } +} + +/* + *-------------------------------------------------------------- + * + * PolygonToPoint -- + * + * Computes the distance from a given point to a given + * polygon, 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 polygon. If the + * point isn't inside the polygon then the return value is the + * distance from the point to the polygon. + * + * Side effects: + * None. + * + *-------------------------------------------------------------- + */ + + /* ARGSUSED */ +static double +PolygonToPoint(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. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + double *coordPtr, distance; + double staticSpace[2*MAX_STATIC_POINTS]; + int numPoints; + + if (!polyPtr->smooth) { + distance = TkPolygonToPoint(polyPtr->coordPtr, polyPtr->numPoints, + pointPtr); + } else { + /* + * Smoothed polygon. Generate a new set of points and use them + * for comparison. + */ + + numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps; + if (numPoints <= MAX_STATIC_POINTS) { + coordPtr = staticSpace; + } else { + coordPtr = (double *) ckalloc((unsigned) + (2*numPoints*sizeof(double))); + } + numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr, + polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL, + coordPtr); + distance = TkPolygonToPoint(coordPtr, numPoints, pointPtr); + if (coordPtr != staticSpace) { + ckfree((char *) coordPtr); + } + } + if (polyPtr->outlineColor != NULL) { + distance -= polyPtr->width/2.0; + if (distance < 0) { + distance = 0; + } + } + return distance; +} + +/* + *-------------------------------------------------------------- + * + * PolygonToArea -- + * + * 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 + * given by rectPtr, 0 if it overlaps, and 1 if it is entirely + * inside the given area. + * + * Side effects: + * None. + * + *-------------------------------------------------------------- + */ + + /* ARGSUSED */ +static int +PolygonToArea(canvas, itemPtr, rectPtr) + Tk_Canvas canvas; /* Canvas containing item. */ + Tk_Item *itemPtr; /* Item to check against polygon. */ + double *rectPtr; /* Pointer to array of four coordinates + * (x1, y1, x2, y2) describing rectangular + * area. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + double *coordPtr, rect2[4], halfWidth; + double staticSpace[2*MAX_STATIC_POINTS]; + int numPoints, result; + + /* + * Handle smoothed polygons by generating an expanded set of points + * against which to do the check. + */ + + if (polyPtr->smooth) { + numPoints = 1 + polyPtr->numPoints*polyPtr->splineSteps; + if (numPoints <= MAX_STATIC_POINTS) { + coordPtr = staticSpace; + } else { + coordPtr = (double *) ckalloc((unsigned) + (2*numPoints*sizeof(double))); + } + numPoints = TkMakeBezierCurve(canvas, polyPtr->coordPtr, + polyPtr->numPoints, polyPtr->splineSteps, (XPoint *) NULL, + coordPtr); + } else { + numPoints = polyPtr->numPoints; + coordPtr = polyPtr->coordPtr; + } + + if (polyPtr->width <= 1) { + /* + * The outline of the polygon doesn't stick out, so we can + * do a simple check. + */ + + result = TkPolygonToArea(coordPtr, numPoints, rectPtr); + } else { + /* + * The polygon has a wide outline, so the check is more complicated. + * First, check the line segments to see if they overlap the area. + */ + + result = TkThickPolyLineToArea(coordPtr, numPoints, + (double) polyPtr->width, CapRound, JoinRound, rectPtr); + if (result >= 0) { + goto done; + } + + /* + * There is no overlap between the polygon's outline and the + * rectangle. This means either the rectangle is entirely outside + * the polygon or entirely inside. To tell the difference, + * see whether the polygon (with 0 outline width) overlaps the + * rectangle bloated by half the outline width. + */ + + halfWidth = polyPtr->width/2.0; + rect2[0] = rectPtr[0] - halfWidth; + rect2[1] = rectPtr[1] - halfWidth; + rect2[2] = rectPtr[2] + halfWidth; + rect2[3] = rectPtr[3] + halfWidth; + if (TkPolygonToArea(coordPtr, numPoints, rect2) == -1) { + result = -1; + } else { + result = 0; + } + } + + done: + if ((coordPtr != staticSpace) && (coordPtr != polyPtr->coordPtr)) { + ckfree((char *) coordPtr); + } + return result; +} + +/* + *-------------------------------------------------------------- + * + * ScalePolygon -- + * + * This procedure is invoked to rescale a polygon item. + * + * Results: + * None. + * + * Side effects: + * The polygon 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 +ScalePolygon(canvas, itemPtr, originX, originY, scaleX, scaleY) + Tk_Canvas canvas; /* Canvas containing polygon. */ + Tk_Item *itemPtr; /* Polygon 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. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + double *coordPtr; + int i; + + for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints; + i++, coordPtr += 2) { + *coordPtr = originX + scaleX*(*coordPtr - originX); + coordPtr[1] = originY + scaleY*(coordPtr[1] - originY); + } + ComputePolygonBbox(canvas, polyPtr); +} + +/* + *-------------------------------------------------------------- + * + * TranslatePolygon -- + * + * This procedure is called to move a polygon by a given + * amount. + * + * Results: + * None. + * + * Side effects: + * The position of the polygon is offset by (xDelta, yDelta), + * and the bounding box is updated in the generic part of the + * item structure. + * + *-------------------------------------------------------------- + */ + +static void +TranslatePolygon(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. */ +{ + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + double *coordPtr; + int i; + + for (i = 0, coordPtr = polyPtr->coordPtr; i < polyPtr->numPoints; + i++, coordPtr += 2) { + *coordPtr += deltaX; + coordPtr[1] += deltaY; + } + ComputePolygonBbox(canvas, polyPtr); +} + +/* + *-------------------------------------------------------------- + * + * PolygonToPostscript -- + * + * This procedure is called to generate Postscript for + * polygon 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 +PolygonToPostscript(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. */ +{ + char string[100]; + PolygonItem *polyPtr = (PolygonItem *) itemPtr; + + /* + * Fill the area of the polygon. + */ + + if (polyPtr->fillColor != NULL) { + if (!polyPtr->smooth) { + Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr, + polyPtr->numPoints); + } else { + TkMakeBezierPostscript(interp, canvas, polyPtr->coordPtr, + polyPtr->numPoints); + } + if (Tk_CanvasPsColor(interp, canvas, polyPtr->fillColor) != TCL_OK) { + return TCL_ERROR; + } + if (polyPtr->fillStipple != None) { + Tcl_AppendResult(interp, "eoclip ", (char *) NULL); + if (Tk_CanvasPsStipple(interp, canvas, polyPtr->fillStipple) + != TCL_OK) { + return TCL_ERROR; + } + if (polyPtr->outlineColor != NULL) { + Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL); + } + } else { + Tcl_AppendResult(interp, "eofill\n", (char *) NULL); + } + } + + /* + * Now draw the outline, if there is one. + */ + + if (polyPtr->outlineColor != NULL) { + if (!polyPtr->smooth) { + Tk_CanvasPsPath(interp, canvas, polyPtr->coordPtr, + polyPtr->numPoints); + } else { + TkMakeBezierPostscript(interp, canvas, polyPtr->coordPtr, + polyPtr->numPoints); + } + + sprintf(string, "%d setlinewidth\n", polyPtr->width); + Tcl_AppendResult(interp, string, + "1 setlinecap\n1 setlinejoin\n", (char *) NULL); + if (Tk_CanvasPsColor(interp, canvas, polyPtr->outlineColor) + != TCL_OK) { + return TCL_ERROR; + } + Tcl_AppendResult(interp, "stroke\n", (char *) NULL); + } + return TCL_OK; +} |