tk.git - Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.

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author	hobbs <hobbs>	2001-10-01 21:22:48 (GMT)
committer	hobbs <hobbs>	2001-10-01 21:22:48 (GMT)
commit	a13963715eb1efbf88d27fb1fee64cd46f7401ce (patch)
tree	49ea9564084ce748442ce3b845a8a0ba7dc48dd1
parent	a3a498a5c1f6f17a5c96c91ece98f1965ccb94be (diff)
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ChangeLog

1 files changed, 7 insertions, 0 deletions

/* * tkCanvBmap.c -- * * This file implements bitmap items for canvas widgets. * * Copyright (c) 1992-1994 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: tkCanvBmap.c,v 1.14 2007/12/13 15:24:13 dgp Exp $ */ #include <stdio.h> #include "tkInt.h" #include "tkCanvas.h" /* * The structure below defines the record for each bitmap item. */ typedef struct BitmapItem { Tk_Item header; /* Generic stuff that's the same for all * types. MUST BE FIRST IN STRUCTURE. */ double x, y; /* Coordinates of positioning point for * bitmap. */ Tk_Anchor anchor; /* Where to anchor bitmap relative to (x,y) */ Pixmap bitmap; /* Bitmap to display in window. */ Pixmap activeBitmap; /* Bitmap to display in window. */ Pixmap disabledBitmap; /* Bitmap to display in window. */ XColor *fgColor; /* Foreground color to use for bitmap. */ XColor *activeFgColor; /* Foreground color to use for bitmap. */ XColor *disabledFgColor; /* Foreground color to use for bitmap. */ XColor *bgColor; /* Background color to use for bitmap. */ XColor *activeBgColor; /* Background color to use for bitmap. */ XColor *disabledBgColor; /* Background color to use for bitmap. */ GC gc; /* Graphics context to use for drawing bitmap * on screen. */ } BitmapItem; /* * Information used for parsing configuration specs: */ static Tk_CustomOption stateOption = { (Tk_OptionParseProc *) TkStateParseProc, TkStatePrintProc, (ClientData) 2 }; static Tk_CustomOption tagsOption = { (Tk_OptionParseProc *) Tk_CanvasTagsParseProc, Tk_CanvasTagsPrintProc, (ClientData) NULL }; static Tk_ConfigSpec configSpecs[] = { {TK_CONFIG_COLOR, "-activebackground", NULL, NULL, NULL, Tk_Offset(BitmapItem, activeBgColor), TK_CONFIG_NULL_OK}, {TK_CONFIG_BITMAP, "-activebitmap", NULL, NULL, NULL, Tk_Offset(BitmapItem, activeBitmap), TK_CONFIG_NULL_OK}, {TK_CONFIG_COLOR, "-activeforeground", NULL, NULL, NULL, Tk_Offset(BitmapItem, activeFgColor), TK_CONFIG_NULL_OK}, {TK_CONFIG_ANCHOR, "-anchor", NULL, NULL, "center", Tk_Offset(BitmapItem, anchor), TK_CONFIG_DONT_SET_DEFAULT}, {TK_CONFIG_COLOR, "-background", NULL, NULL, NULL, Tk_Offset(BitmapItem, bgColor), TK_CONFIG_NULL_OK}, {TK_CONFIG_BITMAP, "-bitmap", NULL, NULL, NULL, Tk_Offset(BitmapItem, bitmap), TK_CONFIG_NULL_OK}, {TK_CONFIG_COLOR, "-disabledbackground", NULL, NULL, NULL, Tk_Offset(BitmapItem, disabledBgColor), TK_CONFIG_NULL_OK}, {TK_CONFIG_BITMAP, "-disabledbitmap", NULL, NULL, NULL, Tk_Offset(BitmapItem, disabledBitmap), TK_CONFIG_NULL_OK}, {TK_CONFIG_COLOR, "-disabledforeground", NULL, NULL, NULL, Tk_Offset(BitmapItem, disabledFgColor), TK_CONFIG_NULL_OK}, {TK_CONFIG_COLOR, "-foreground", NULL, NULL, "black", Tk_Offset(BitmapItem, fgColor), 0}, {TK_CONFIG_CUSTOM, "-state", NULL, NULL, NULL, Tk_Offset(Tk_Item, state), TK_CONFIG_NULL_OK, &stateOption}, {TK_CONFIG_CUSTOM, "-tags", NULL, NULL, NULL, 0, TK_CONFIG_NULL_OK, &tagsOption}, {TK_CONFIG_END, NULL, NULL, NULL, NULL, 0, 0} }; /* * Prototypes for functions defined in this file: */ static int BitmapCoords(Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, int objc, Tcl_Obj *CONST objv[]); static int BitmapToArea(Tk_Canvas canvas, Tk_Item *itemPtr, double *rectPtr); static double BitmapToPoint(Tk_Canvas canvas, Tk_Item *itemPtr, double *coordPtr); static int BitmapToPostscript(Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, int prepass); static void ComputeBitmapBbox(Tk_Canvas canvas, BitmapItem *bmapPtr); static int ConfigureBitmap(Tcl_Interp *interp, Tk_Canvas canvas, Tk_Item *itemPtr, int objc, Tcl_Obj *CONST objv[], int flags); static int TkcCreateBitmap(Tcl_Interp *interp, Tk_Canvas canvas, struct Tk_Item *itemPtr, int objc, Tcl_Obj *CONST objv[]); static void DeleteBitmap(Tk_Canvas canvas, Tk_Item *itemPtr, Display *display); static void DisplayBitmap(Tk_Canvas canvas, Tk_Item *itemPtr, Display *display, Drawable dst, int x, int y, int width, int height); static void ScaleBitmap(Tk_Canvas canvas, Tk_Item *itemPtr, double originX, double originY, double scaleX, double scaleY); static void TranslateBitmap(Tk_Canvas canvas, Tk_Item *itemPtr, double deltaX, double deltaY); /* * The structures below defines the bitmap item type in terms of functions * that can be invoked by generic item code. */ Tk_ItemType tkBitmapType = { "bitmap", /* name */ sizeof(BitmapItem), /* itemSize */ TkcCreateBitmap, /* createProc */ configSpecs, /* configSpecs */ ConfigureBitmap, /* configureProc */ BitmapCoords, /* coordProc */ DeleteBitmap, /* deleteProc */ DisplayBitmap, /* displayProc */ TK_CONFIG_OBJS, /* flags */ BitmapToPoint, /* pointProc */ BitmapToArea, /* areaProc */ BitmapToPostscript, /* postscriptProc */ ScaleBitmap, /* scaleProc */ TranslateBitmap, /* translateProc */ NULL, /* indexProc */ NULL, /* icursorProc */ NULL, /* selectionProc */ NULL, /* insertProc */ NULL, /* dTextProc */ NULL, /* nextPtr */ }; /* *-------------------------------------------------------------- * * TkcCreateBitmap -- * * This function is invoked to create a new bitmap 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 bitmap item is created. * *-------------------------------------------------------------- */ static int TkcCreateBitmap( 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 rectangle. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; int i; if (objc == 0) { Tcl_Panic("canvas did not pass any coords\n"); } /* * Initialize item's record. */ bmapPtr->anchor = TK_ANCHOR_CENTER; bmapPtr->bitmap = None; bmapPtr->activeBitmap = None; bmapPtr->disabledBitmap = None; bmapPtr->fgColor = NULL; bmapPtr->activeFgColor = NULL; bmapPtr->disabledFgColor = NULL; bmapPtr->bgColor = NULL; bmapPtr->activeBgColor = NULL; bmapPtr->disabledBgColor = NULL; bmapPtr->gc = None; /* * Process the arguments to fill in the item record. Only 1 (list) or 2 (x * y) coords are allowed. */ if (objc == 1) { i = 1; } else { char *arg = Tcl_GetString(objv[1]); i = 2; if ((arg[0] == '-') && (arg[1] >= 'a') && (arg[1] <= 'z')) { i = 1; } } if (BitmapCoords(interp, canvas, itemPtr, i, objv) != TCL_OK) { goto error; } if (ConfigureBitmap(interp, canvas, itemPtr, objc-i, objv+i, 0) == TCL_OK) { return TCL_OK; } error: DeleteBitmap(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas))); return TCL_ERROR; } /* *-------------------------------------------------------------- * * BitmapCoords -- * * This function is invoked to process the "coords" widget command on * bitmap items. 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 BitmapCoords( 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, ... */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; if (objc == 0) { Tcl_Obj *obj = Tcl_NewObj(); Tcl_Obj *subobj = Tcl_NewDoubleObj(bmapPtr->x); Tcl_ListObjAppendElement(interp, obj, subobj); subobj = Tcl_NewDoubleObj(bmapPtr->y); Tcl_ListObjAppendElement(interp, obj, subobj); Tcl_SetObjResult(interp, obj); } else if (objc < 3) { if (objc == 1) { if (Tcl_ListObjGetElements(interp, objv[0], &objc, (Tcl_Obj ***) &objv) != TCL_OK) { return TCL_ERROR; } else if (objc != 2) { char buf[64 + TCL_INTEGER_SPACE]; sprintf(buf, "wrong # coordinates: expected 2, got %d", objc); Tcl_SetResult(interp, buf, TCL_VOLATILE); return TCL_ERROR; } } if ((Tk_CanvasGetCoordFromObj(interp, canvas, objv[0], &bmapPtr->x) != TCL_OK) || (Tk_CanvasGetCoordFromObj(interp, canvas, objv[1], &bmapPtr->y) != TCL_OK)) { return TCL_ERROR; } ComputeBitmapBbox(canvas, bmapPtr); } else { char buf[64 + TCL_INTEGER_SPACE]; sprintf(buf, "wrong # coordinates: expected 0 or 2, got %d", objc); Tcl_SetResult(interp, buf, TCL_VOLATILE); return TCL_ERROR; } return TCL_OK; } /* *-------------------------------------------------------------- * * ConfigureBitmap -- * * This function is invoked to configure various aspects of a bitmap * item, such as its anchor position. * * 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 may be set for itemPtr. * *-------------------------------------------------------------- */ static int ConfigureBitmap( Tcl_Interp *interp, /* Used for error reporting. */ Tk_Canvas canvas, /* Canvas containing itemPtr. */ Tk_Item *itemPtr, /* Bitmap 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. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; XGCValues gcValues; GC newGC; Tk_Window tkwin; unsigned long mask; XColor *fgColor; XColor *bgColor; Pixmap bitmap; Tk_State state; tkwin = Tk_CanvasTkwin(canvas); if (TCL_OK != Tk_ConfigureWidget(interp, tkwin, configSpecs, objc, (CONST char **) objv, (char *) bmapPtr, flags|TK_CONFIG_OBJS)) { return TCL_ERROR; } /* * A few of the options require additional processing, such as those that * determine the graphics context. */ state = itemPtr->state; if (bmapPtr->activeFgColor!=NULL || bmapPtr->activeBgColor!=NULL || bmapPtr->activeBitmap!=None) { itemPtr->redraw_flags |= TK_ITEM_STATE_DEPENDANT; } else { itemPtr->redraw_flags &= ~TK_ITEM_STATE_DEPENDANT; } if (state == TK_STATE_NULL) { state = ((TkCanvas *)canvas)->canvas_state; } if (state == TK_STATE_HIDDEN) { ComputeBitmapBbox(canvas, bmapPtr); return TCL_OK; } fgColor = bmapPtr->fgColor; bgColor = bmapPtr->bgColor; bitmap = bmapPtr->bitmap; if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) { if (bmapPtr->activeFgColor!=NULL) { fgColor = bmapPtr->activeFgColor; } if (bmapPtr->activeBgColor!=NULL) { bgColor = bmapPtr->activeBgColor; } if (bmapPtr->activeBitmap!=None) { bitmap = bmapPtr->activeBitmap; } } else if (state == TK_STATE_DISABLED) { if (bmapPtr->disabledFgColor!=NULL) { fgColor = bmapPtr->disabledFgColor; } if (bmapPtr->disabledBgColor!=NULL) { bgColor = bmapPtr->disabledBgColor; } if (bmapPtr->disabledBitmap!=None) { bitmap = bmapPtr->disabledBitmap; } } if (bitmap == None) { newGC = None; } else { gcValues.foreground = fgColor->pixel; mask = GCForeground; if (bgColor != NULL) { gcValues.background = bgColor->pixel; mask |= GCBackground; } else { gcValues.clip_mask = bitmap; mask |= GCClipMask; } newGC = Tk_GetGC(tkwin, mask, &gcValues); } if (bmapPtr->gc != None) { Tk_FreeGC(Tk_Display(tkwin), bmapPtr->gc); } bmapPtr->gc = newGC; ComputeBitmapBbox(canvas, bmapPtr); return TCL_OK; } /* *-------------------------------------------------------------- * * DeleteBitmap -- * * This function is called to clean up the data structure associated with * a bitmap item. * * Results: * None. * * Side effects: * Resources associated with itemPtr are released. * *-------------------------------------------------------------- */ static void DeleteBitmap( Tk_Canvas canvas, /* Info about overall canvas widget. */ Tk_Item *itemPtr, /* Item that is being deleted. */ Display *display) /* Display containing window for canvas. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; if (bmapPtr->bitmap != None) { Tk_FreeBitmap(display, bmapPtr->bitmap); } if (bmapPtr->activeBitmap != None) { Tk_FreeBitmap(display, bmapPtr->activeBitmap); } if (bmapPtr->disabledBitmap != None) { Tk_FreeBitmap(display, bmapPtr->disabledBitmap); } if (bmapPtr->fgColor != NULL) { Tk_FreeColor(bmapPtr->fgColor); } if (bmapPtr->activeFgColor != NULL) { Tk_FreeColor(bmapPtr->activeFgColor); } if (bmapPtr->disabledFgColor != NULL) { Tk_FreeColor(bmapPtr->disabledFgColor); } if (bmapPtr->bgColor != NULL) { Tk_FreeColor(bmapPtr->bgColor); } if (bmapPtr->activeBgColor != NULL) { Tk_FreeColor(bmapPtr->activeBgColor); } if (bmapPtr->disabledBgColor != NULL) { Tk_FreeColor(bmapPtr->disabledBgColor); } if (bmapPtr->gc != NULL) { Tk_FreeGC(display, bmapPtr->gc); } } /* *-------------------------------------------------------------- * * ComputeBitmapBbox -- * * This function is invoked to compute the bounding box of all the pixels * that may be drawn as part of a bitmap item. This function is where the * child bitmap's placement is computed. * * Results: * None. * * Side effects: * The fields x1, y1, x2, and y2 are updated in the header for itemPtr. * *-------------------------------------------------------------- */ /* ARGSUSED */ static void ComputeBitmapBbox( Tk_Canvas canvas, /* Canvas that contains item. */ BitmapItem *bmapPtr) /* Item whose bbox is to be recomputed. */ { int width, height; int x, y; Pixmap bitmap; Tk_State state = bmapPtr->header.state; if (state == TK_STATE_NULL) { state = ((TkCanvas *)canvas)->canvas_state; } bitmap = bmapPtr->bitmap; if (((TkCanvas *)canvas)->currentItemPtr == (Tk_Item *)bmapPtr) { if (bmapPtr->activeBitmap!=None) { bitmap = bmapPtr->activeBitmap; } } else if (state==TK_STATE_DISABLED) { if (bmapPtr->disabledBitmap!=None) { bitmap = bmapPtr->disabledBitmap; } } x = (int) (bmapPtr->x + ((bmapPtr->x >= 0) ? 0.5 : - 0.5)); y = (int) (bmapPtr->y + ((bmapPtr->y >= 0) ? 0.5 : - 0.5)); if (state==TK_STATE_HIDDEN || bitmap == None) { bmapPtr->header.x1 = bmapPtr->header.x2 = x; bmapPtr->header.y1 = bmapPtr->header.y2 = y; return; } /* * Compute location and size of bitmap, using anchor information. */ Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap, &width, &height); switch (bmapPtr->anchor) { case TK_ANCHOR_N: x -= width/2; break; case TK_ANCHOR_NE: x -= width; break; case TK_ANCHOR_E: x -= width; y -= height/2; break; case TK_ANCHOR_SE: x -= width; y -= height; break; case TK_ANCHOR_S: x -= width/2; y -= height; break; case TK_ANCHOR_SW: y -= height; break; case TK_ANCHOR_W: y -= height/2; break; case TK_ANCHOR_NW: break; case TK_ANCHOR_CENTER: x -= width/2; y -= height/2; break; } /* * Store the information in the item header. */ bmapPtr->header.x1 = x; bmapPtr->header.y1 = y; bmapPtr->header.x2 = x + width; bmapPtr->header.y2 = y + height; } /* *-------------------------------------------------------------- * * DisplayBitmap -- * * This function is invoked to draw a bitmap item in a given drawable. * * Results: * None. * * Side effects: * ItemPtr is drawn in drawable using the transformation information in * canvas. * *-------------------------------------------------------------- */ static void DisplayBitmap( 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). */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; int bmapX, bmapY, bmapWidth, bmapHeight; short drawableX, drawableY; Pixmap bitmap; Tk_State state = itemPtr->state; /* * If the area being displayed doesn't cover the whole bitmap, then only * redisplay the part of the bitmap that needs redisplay. */ if (state == TK_STATE_NULL) { state = ((TkCanvas *)canvas)->canvas_state; } bitmap = bmapPtr->bitmap; if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) { if (bmapPtr->activeBitmap!=None) { bitmap = bmapPtr->activeBitmap; } } else if (state == TK_STATE_DISABLED) { if (bmapPtr->disabledBitmap!=None) { bitmap = bmapPtr->disabledBitmap; } } if (bitmap != None) { if (x > bmapPtr->header.x1) { bmapX = x - bmapPtr->header.x1; bmapWidth = bmapPtr->header.x2 - x; } else { bmapX = 0; if ((x+width) < bmapPtr->header.x2) { bmapWidth = x + width - bmapPtr->header.x1; } else { bmapWidth = bmapPtr->header.x2 - bmapPtr->header.x1; } } if (y > bmapPtr->header.y1) { bmapY = y - bmapPtr->header.y1; bmapHeight = bmapPtr->header.y2 - y; } else { bmapY = 0; if ((y+height) < bmapPtr->header.y2) { bmapHeight = y + height - bmapPtr->header.y1; } else { bmapHeight = bmapPtr->header.y2 - bmapPtr->header.y1; } } Tk_CanvasDrawableCoords(canvas, (double) (bmapPtr->header.x1 + bmapX), (double) (bmapPtr->header.y1 + bmapY), &drawableX, &drawableY); /* * Must modify the mask origin within the graphics context to line up * with the bitmap's origin (in order to make bitmaps with * "-background {}" work right). */ XSetClipOrigin(display, bmapPtr->gc, drawableX - bmapX, drawableY - bmapY); XCopyPlane(display, bitmap, drawable, bmapPtr->gc, bmapX, bmapY, (unsigned int) bmapWidth, (unsigned int) bmapHeight, drawableX, drawableY, 1); XSetClipOrigin(display, bmapPtr->gc, 0, 0); } } /* *-------------------------------------------------------------- * * BitmapToPoint -- * * Computes the distance from a given point to a given rectangle, in * canvas units. * * Results: * The return value is 0 if the point whose x and y coordinates are * coordPtr[0] and coordPtr[1] is inside the bitmap. If the point isn't * inside the bitmap then the return value is the distance from the point * to the bitmap. * * Side effects: * None. * *-------------------------------------------------------------- */ /* ARGSUSED */ static double BitmapToPoint( Tk_Canvas canvas, /* Canvas containing item. */ Tk_Item *itemPtr, /* Item to check against point. */ double *coordPtr) /* Pointer to x and y coordinates. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; double x1, x2, y1, y2, xDiff, yDiff; x1 = bmapPtr->header.x1; y1 = bmapPtr->header.y1; x2 = bmapPtr->header.x2; y2 = bmapPtr->header.y2; /* * Point is outside rectangle. */ if (coordPtr[0] < x1) { xDiff = x1 - coordPtr[0]; } else if (coordPtr[0] > x2) { xDiff = coordPtr[0] - x2; } else { xDiff = 0; } if (coordPtr[1] < y1) { yDiff = y1 - coordPtr[1]; } else if (coordPtr[1] > y2) { yDiff = coordPtr[1] - y2; } else { yDiff = 0; } return hypot(xDiff, yDiff); } /* *-------------------------------------------------------------- * * BitmapToArea -- * * This function is called to determine whether an item lies entirely * inside, entirely outside, or overlapping a given rectangle. * * 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 BitmapToArea( Tk_Canvas canvas, /* Canvas containing item. */ Tk_Item *itemPtr, /* Item to check against rectangle. */ double *rectPtr) /* Pointer to array of four coordinates * (x1,y1,x2,y2) describing rectangular * area. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; if ((rectPtr[2] <= bmapPtr->header.x1) || (rectPtr[0] >= bmapPtr->header.x2) || (rectPtr[3] <= bmapPtr->header.y1) || (rectPtr[1] >= bmapPtr->header.y2)) { return -1; } if ((rectPtr[0] <= bmapPtr->header.x1) && (rectPtr[1] <= bmapPtr->header.y1) && (rectPtr[2] >= bmapPtr->header.x2) && (rectPtr[3] >= bmapPtr->header.y2)) { return 1; } return 0; } /* *-------------------------------------------------------------- * * ScaleBitmap -- * * This function is invoked to rescale a bitmap item in a canvas. It is * one of the standard item functions for bitmap items, and is invoked by * the generic canvas code. * * Results: * None. * * Side effects: * The item 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 ScaleBitmap( Tk_Canvas canvas, /* Canvas containing rectangle. */ Tk_Item *itemPtr, /* Rectangle to be scaled. */ double originX, double originY, /* Origin about which to scale item. */ double scaleX, /* Amount to scale in X direction. */ double scaleY) /* Amount to scale in Y direction. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; bmapPtr->x = originX + scaleX*(bmapPtr->x - originX); bmapPtr->y = originY + scaleY*(bmapPtr->y - originY); ComputeBitmapBbox(canvas, bmapPtr); } /* *-------------------------------------------------------------- * * TranslateBitmap -- * * This function is called to move an item by a given amount. * * Results: * None. * * Side effects: * The position of the item is offset by (xDelta, yDelta), and the * bounding box is updated in the generic part of the item structure. * *-------------------------------------------------------------- */ static void TranslateBitmap( 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. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; bmapPtr->x += deltaX; bmapPtr->y += deltaY; ComputeBitmapBbox(canvas, bmapPtr); } /* *-------------------------------------------------------------- * * BitmapToPostscript -- * * This function is called to generate Postscript for bitmap 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 BitmapToPostscript( 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. */ { BitmapItem *bmapPtr = (BitmapItem *) itemPtr; double x, y; int width, height, rowsAtOnce, rowsThisTime; int curRow; char buffer[100 + TCL_DOUBLE_SPACE * 2 + TCL_INTEGER_SPACE * 4]; XColor *fgColor; XColor *bgColor; Pixmap bitmap; Tk_State state = itemPtr->state; if (state == TK_STATE_NULL) { state = ((TkCanvas *)canvas)->canvas_state; } fgColor = bmapPtr->fgColor; bgColor = bmapPtr->bgColor; bitmap = bmapPtr->bitmap; if (((TkCanvas *)canvas)->currentItemPtr == itemPtr) { if (bmapPtr->activeFgColor!=NULL) { fgColor = bmapPtr->activeFgColor; } if (bmapPtr->activeBgColor!=NULL) { bgColor = bmapPtr->activeBgColor; } if (bmapPtr->activeBitmap!=None) { bitmap = bmapPtr->activeBitmap; } } else if (state == TK_STATE_DISABLED) { if (bmapPtr->disabledFgColor!=NULL) { fgColor = bmapPtr->disabledFgColor; } if (bmapPtr->disabledBgColor!=NULL) { bgColor = bmapPtr->disabledBgColor; } if (bmapPtr->disabledBitmap!=None) { bitmap = bmapPtr->disabledBitmap; } } if (bitmap == None) { return TCL_OK; } /* * Compute the coordinates of the lower-left corner of the bitmap, taking * into account the anchor position for the bitmp. */ x = bmapPtr->x; y = Tk_CanvasPsY(canvas, bmapPtr->y); Tk_SizeOfBitmap(Tk_Display(Tk_CanvasTkwin(canvas)), bitmap, &width, &height); switch (bmapPtr->anchor) { case TK_ANCHOR_NW: y -= height; break; case TK_ANCHOR_N: x -= width/2.0; y -= height; break; case TK_ANCHOR_NE: x -= width; y -= height; break; case TK_ANCHOR_E: x -= width; y -= height/2.0; break; case TK_ANCHOR_SE: x -= width; break; case TK_ANCHOR_S: x -= width/2.0; break; case TK_ANCHOR_SW: break; case TK_ANCHOR_W: y -= height/2.0; break; case TK_ANCHOR_CENTER: x -= width/2.0; y -= height/2.0; break; } /* * Color the background, if there is one. */ if (bgColor != NULL) { sprintf(buffer, "%.15g %.15g moveto %d 0 rlineto 0 %d rlineto %d %s\n", x, y, width, height, -width, "0 rlineto closepath"); Tcl_AppendResult(interp, buffer, NULL); if (Tk_CanvasPsColor(interp, canvas, bgColor) != TCL_OK) { return TCL_ERROR; } Tcl_AppendResult(interp, "fill\n", NULL); } /* * Draw the bitmap, if there is a foreground color. If the bitmap is very * large, then chop it up into multiple bitmaps, each consisting of one or * more rows. This is needed because Postscript can't handle single * strings longer than 64 KBytes long. */ if (fgColor != NULL) { if (Tk_CanvasPsColor(interp, canvas, fgColor) != TCL_OK) { return TCL_ERROR; } if (width > 60000) { Tcl_ResetResult(interp); Tcl_AppendResult(interp, "can't generate Postscript", " for bitmaps more than 60000 pixels wide", NULL); return TCL_ERROR; } rowsAtOnce = 60000/width; if (rowsAtOnce < 1) { rowsAtOnce = 1; } sprintf(buffer, "%.15g %.15g translate\n", x, y+height); Tcl_AppendResult(interp, buffer, NULL); for (curRow = 0; curRow < height; curRow += rowsAtOnce) { rowsThisTime = rowsAtOnce; if (rowsThisTime > (height - curRow)) { rowsThisTime = height - curRow; } sprintf(buffer, "0 -%.15g translate\n%d %d true matrix {\n", (double) rowsThisTime, width, rowsThisTime); Tcl_AppendResult(interp, buffer, NULL); if (Tk_CanvasPsBitmap(interp, canvas, bitmap, 0, curRow, width, rowsThisTime) != TCL_OK) { return TCL_ERROR; } Tcl_AppendResult(interp, "\n} imagemask\n", NULL); } } return TCL_OK; } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */


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