1050 lines
30 KiB
C
1050 lines
30 KiB
C
/*
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* tk3d.c --
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*
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* This module provides procedures to draw borders in
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* the three-dimensional Motif style.
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*
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* Copyright (c) 1990-1993 The Regents of the University of California.
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* All rights reserved.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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* OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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* CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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#ifndef lint
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static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tk3d.c,v 1.36 93/06/16 17:15:59 ouster Exp $ SPRITE (Berkeley)";
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#endif
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#include "tkConfig.h"
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#include "tk.h"
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/*
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* One of the following data structures is allocated for
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* each 3-D border currently in use. Structures of this
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* type are indexed by borderTable, so that a single
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* structure can be shared for several uses.
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*/
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typedef struct {
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Display *display; /* Display for which the resources
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* below are allocated. */
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int refCount; /* Number of different users of
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* this border. */
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XColor *bgColorPtr; /* Background color (intensity
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* between lightColorPtr and
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* darkColorPtr). */
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XColor *lightColorPtr; /* Color used for lighter areas of
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* border (must free this when
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* deleting structure). */
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XColor *darkColorPtr; /* Color for darker areas (must
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* free when deleting structure). */
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Pixmap shadow; /* Stipple pattern to use for drawing
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* lighter-shadow-ed areas. Only used on
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* monochrome displays; on color displays
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* this is None. */
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GC lightGC; /* Used to draw lighter parts of
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* the border. */
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GC darkGC; /* Used to draw darker parts of the
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* border. */
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GC bgGC; /* Used (if necessary) to draw areas in
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* the background color. */
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Tcl_HashEntry *hashPtr; /* Entry in borderTable (needed in
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* order to delete structure). */
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} Border;
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/*
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* Hash table to map from a border's values (color, etc.) to a
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* Border structure for those values.
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*/
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static Tcl_HashTable borderTable;
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typedef struct {
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Tk_Uid colorName; /* Color for border. */
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Colormap colormap; /* Colormap used for allocating border
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* colors. */
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Screen *screen; /* Screen on which border will be drawn. */
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} BorderKey;
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/*
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* Maximum intensity for a color:
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*/
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#define MAX_INTENSITY 65535
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static int initialized = 0; /* 0 means static structures haven't
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* been initialized yet. */
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/*
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* Forward declarations for procedures defined in this file:
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*/
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static void BorderInit _ANSI_ARGS_((void));
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static int Intersect _ANSI_ARGS_((XPoint *a1Ptr, XPoint *a2Ptr,
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XPoint *b1Ptr, XPoint *b2Ptr, XPoint *iPtr));
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static void ShiftLine _ANSI_ARGS_((XPoint *p1Ptr, XPoint *p2Ptr,
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int distance, XPoint *p3Ptr));
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/*
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*--------------------------------------------------------------
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*
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* Tk_Get3DBorder --
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*
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* Create a data structure for displaying a 3-D border.
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*
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* Results:
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* The return value is a token for a data structure
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* describing a 3-D border. This token may be passed
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* to Tk_Draw3DRectangle and Tk_Free3DBorder. If an
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* error prevented the border from being created then
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* NULL is returned and an error message will be left
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* in interp->result.
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*
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* Side effects:
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* Data structures, graphics contexts, etc. are allocated.
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* It is the caller's responsibility to eventually call
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* Tk_Free3DBorder to release the resources.
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*
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*--------------------------------------------------------------
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*/
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Tk_3DBorder
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Tk_Get3DBorder(interp, tkwin, colormap, colorName)
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Tcl_Interp *interp; /* Place to store an error message. */
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Tk_Window tkwin; /* Token for window in which
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* border will be drawn. */
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Colormap colormap; /* Colormap to use for allocating border
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* colors. None means use current colormap
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* for tkwin. */
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Tk_Uid colorName; /* String giving name of color
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* for window background. */
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{
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BorderKey key;
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Tcl_HashEntry *hashPtr;
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register Border *borderPtr;
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int new;
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unsigned long light, dark;
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XGCValues gcValues;
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unsigned long mask;
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if (!initialized) {
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BorderInit();
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}
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/*
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* First, check to see if there's already a border that will work
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* for this request.
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*/
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key.colorName = colorName;
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if (colormap == None) {
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colormap = Tk_Colormap(tkwin);
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}
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key.colormap = colormap;
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key.screen = Tk_Screen(tkwin);
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hashPtr = Tcl_CreateHashEntry(&borderTable, (char *) &key, &new);
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if (!new) {
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borderPtr = (Border *) Tcl_GetHashValue(hashPtr);
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borderPtr->refCount++;
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} else {
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/*
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* No satisfactory border exists yet. Initialize a new one.
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*/
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borderPtr = (Border *) ckalloc(sizeof(Border));
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borderPtr->display = Tk_Display(tkwin);
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borderPtr->refCount = 1;
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borderPtr->bgColorPtr = NULL;
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borderPtr->lightColorPtr = NULL;
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borderPtr->darkColorPtr = NULL;
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borderPtr->shadow = None;
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borderPtr->lightGC = None;
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borderPtr->darkGC = None;
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borderPtr->bgGC = None;
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borderPtr->hashPtr = hashPtr;
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Tcl_SetHashValue(hashPtr, borderPtr);
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/*
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* Figure out what colors and GC's to use for the light
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* and dark areas and set up the graphics contexts.
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* Monochrome displays get handled differently than
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* color displays.
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*/
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borderPtr->bgColorPtr = Tk_GetColor(interp, tkwin,
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key.colormap, colorName);
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if (borderPtr->bgColorPtr == NULL) {
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goto error;
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}
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if (Tk_GetColorModel(tkwin) == TK_COLOR) {
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XColor lightColor, darkColor;
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int tmp;
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/*
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* Color display. Compute the colors for the illuminated
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* and shaded portions of the border.
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*/
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tmp = (14 * (int) borderPtr->bgColorPtr->red)/10;
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if (tmp > MAX_INTENSITY) {
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tmp = MAX_INTENSITY;
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}
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lightColor.red = tmp;
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tmp = (14 * (int) borderPtr->bgColorPtr->green)/10;
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if (tmp > MAX_INTENSITY) {
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tmp = MAX_INTENSITY;
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}
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lightColor.green = tmp;
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tmp = (14 * (int) borderPtr->bgColorPtr->blue)/10;
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if (tmp > MAX_INTENSITY) {
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tmp = MAX_INTENSITY;
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}
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lightColor.blue = tmp;
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darkColor.red = (60 * (int) borderPtr->bgColorPtr->red)/100;
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darkColor.green = (60 * (int) borderPtr->bgColorPtr->green)/100;
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darkColor.blue = (60 * (int) borderPtr->bgColorPtr->blue)/100;
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borderPtr->lightColorPtr = Tk_GetColorByValue(interp, tkwin,
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key.colormap, &lightColor);
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if (borderPtr->lightColorPtr == NULL) {
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goto error;
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}
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borderPtr->darkColorPtr = Tk_GetColorByValue(interp, tkwin,
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key.colormap, &darkColor);
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if (borderPtr->darkColorPtr == NULL) {
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goto error;
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}
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light = borderPtr->lightColorPtr->pixel;
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dark = borderPtr->darkColorPtr->pixel;
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} else {
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/*
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* Monochrome display.
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*/
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light = borderPtr->bgColorPtr->pixel;
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if (light == WhitePixelOfScreen(Tk_Screen(tkwin))) {
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dark = BlackPixelOfScreen(Tk_Screen(tkwin));
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} else {
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dark = WhitePixelOfScreen(Tk_Screen(tkwin));
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}
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borderPtr->shadow = Tk_GetBitmap(interp, tkwin,
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Tk_GetUid("gray50"));
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if (borderPtr->shadow == None) {
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goto error;
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}
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}
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gcValues.foreground = light;
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gcValues.background = dark;
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mask = GCForeground|GCBackground;
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if (borderPtr->shadow != None) {
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gcValues.stipple = borderPtr->shadow;
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gcValues.fill_style = FillOpaqueStippled;
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mask |= GCStipple|GCFillStyle;
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}
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borderPtr->lightGC = Tk_GetGC(tkwin, mask, &gcValues);
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gcValues.foreground = dark;
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gcValues.background = light;
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borderPtr->darkGC = Tk_GetGC(tkwin, GCForeground|GCBackground,
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&gcValues);
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gcValues.foreground = borderPtr->bgColorPtr->pixel;
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borderPtr->bgGC = Tk_GetGC(tkwin, GCForeground, &gcValues);
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}
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return (Tk_3DBorder) borderPtr;
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error:
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Tk_Free3DBorder((Tk_3DBorder) borderPtr);
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return NULL;
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}
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/*
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*--------------------------------------------------------------
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*
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* Tk_Draw3DRectangle --
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*
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* Draw a 3-D border at a given place in a given window.
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*
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* Results:
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* None.
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*
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* Side effects:
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* A 3-D border will be drawn in the indicated drawable.
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* The outside edges of the border will be determined by x,
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* y, width, and height. The inside edges of the border
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* will be determined by the borderWidth argument.
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*
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*--------------------------------------------------------------
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*/
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void
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Tk_Draw3DRectangle(display, drawable, border, x, y, width, height,
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borderWidth, relief)
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Display *display; /* X display in which to draw. */
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Drawable drawable; /* X window or pixmap in which to draw. */
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Tk_3DBorder border; /* Token for border to draw. */
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int x, y, width, height; /* Outside area of region in
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* which border will be drawn. */
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int borderWidth; /* Desired width for border, in
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* pixels. */
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int relief; /* Type of relief: TK_RELIEF_RAISED,
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* TK_RELIEF_SUNKEN, TK_RELIEF_GROOVE, etc. */
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{
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register Border *borderPtr = (Border *) border;
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GC top, bottom;
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XPoint points[7];
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||
|
||
if ((width < 2*borderWidth) || (height < 2*borderWidth)) {
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return;
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||
}
|
||
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/*
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* Handle grooves and ridges with recursive calls.
|
||
*/
|
||
|
||
if ((relief == TK_RELIEF_GROOVE) || (relief == TK_RELIEF_RIDGE)) {
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||
int halfWidth, insideOffset;
|
||
|
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halfWidth = borderWidth/2;
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||
insideOffset = borderWidth - halfWidth;
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Tk_Draw3DRectangle(display, drawable, border, x, y, width, height,
|
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halfWidth, (relief == TK_RELIEF_GROOVE) ? TK_RELIEF_SUNKEN
|
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: TK_RELIEF_RAISED);
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Tk_Draw3DRectangle(display, drawable, border, x + insideOffset,
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y + insideOffset, width - insideOffset*2,
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height - insideOffset*2, halfWidth,
|
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(relief == TK_RELIEF_GROOVE) ? TK_RELIEF_RAISED
|
||
: TK_RELIEF_SUNKEN);
|
||
return;
|
||
}
|
||
|
||
if (relief == TK_RELIEF_RAISED) {
|
||
top = borderPtr->lightGC;
|
||
bottom = borderPtr->darkGC;
|
||
} else if (relief == TK_RELIEF_SUNKEN) {
|
||
top = borderPtr->darkGC;
|
||
bottom = borderPtr->lightGC;
|
||
} else {
|
||
top = bottom = borderPtr->bgGC;
|
||
}
|
||
XFillRectangle(display, drawable, bottom, x, y+height-borderWidth,
|
||
|
||
(unsigned int) width, (unsigned int) borderWidth);
|
||
XFillRectangle(display, drawable, bottom, x+width-borderWidth, y,
|
||
(unsigned int) borderWidth, (unsigned int) height);
|
||
points[0].x = points[1].x = points[6].x = x;
|
||
points[0].y = points[6].y = y + height;
|
||
points[1].y = points[2].y = y;
|
||
points[2].x = x + width;
|
||
points[3].x = x + width - borderWidth;
|
||
points[3].y = points[4].y = y + borderWidth;
|
||
points[4].x = points[5].x = x + borderWidth;
|
||
points[5].y = y + height - borderWidth;
|
||
XFillPolygon(display, drawable, top, points, 7, Nonconvex,
|
||
CoordModeOrigin);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* Tk_NameOf3DBorder --
|
||
*
|
||
* Given a border, return a textual string identifying the
|
||
* border's color.
|
||
*
|
||
* Results:
|
||
* The return value is the string that was used to create
|
||
* the border.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
char *
|
||
Tk_NameOf3DBorder(border)
|
||
Tk_3DBorder border; /* Token for border. */
|
||
{
|
||
Border *borderPtr = (Border *) border;
|
||
|
||
return ((BorderKey *) borderPtr->hashPtr->key.words)->colorName;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------------
|
||
*
|
||
* Tk_3DBorderColor --
|
||
*
|
||
* Given a 3D border, return the X color used for the "flat"
|
||
* surfaces.
|
||
*
|
||
* Results:
|
||
* Returns the color used drawing flat surfaces with the border.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------------
|
||
*/
|
||
XColor *
|
||
Tk_3DBorderColor(border)
|
||
Tk_3DBorder border;
|
||
{
|
||
return(((Border *) border)->bgColorPtr);
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* Tk_Free3DBorder --
|
||
*
|
||
* This procedure is called when a 3D border is no longer
|
||
* needed. It frees the resources associated with the
|
||
* border. After this call, the caller should never again
|
||
* use the "border" token.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Resources are freed.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_Free3DBorder(border)
|
||
Tk_3DBorder border; /* Token for border to be released. */
|
||
{
|
||
register Border *borderPtr = (Border *) border;
|
||
|
||
borderPtr->refCount--;
|
||
if (borderPtr->refCount == 0) {
|
||
if (borderPtr->bgColorPtr != NULL) {
|
||
Tk_FreeColor(borderPtr->bgColorPtr);
|
||
}
|
||
if (borderPtr->lightColorPtr != NULL) {
|
||
Tk_FreeColor(borderPtr->lightColorPtr);
|
||
}
|
||
if (borderPtr->darkColorPtr != NULL) {
|
||
Tk_FreeColor(borderPtr->darkColorPtr);
|
||
}
|
||
if (borderPtr->shadow != None) {
|
||
Tk_FreeBitmap(borderPtr->display, borderPtr->shadow);
|
||
}
|
||
if (borderPtr->lightGC != None) {
|
||
Tk_FreeGC(borderPtr->display, borderPtr->lightGC);
|
||
}
|
||
if (borderPtr->darkGC != None) {
|
||
Tk_FreeGC(borderPtr->display, borderPtr->darkGC);
|
||
}
|
||
if (borderPtr->bgGC != None) {
|
||
Tk_FreeGC(borderPtr->display, borderPtr->bgGC);
|
||
}
|
||
Tcl_DeleteHashEntry(borderPtr->hashPtr);
|
||
ckfree((char *) borderPtr);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_SetBackgroundFromBorder --
|
||
*
|
||
* Change the background of a window to one appropriate for a given
|
||
* 3-D border.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Tkwin's background gets modified.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_SetBackgroundFromBorder(tkwin, border)
|
||
Tk_Window tkwin; /* Window whose background is to be set. */
|
||
Tk_3DBorder border; /* Token for border. */
|
||
{
|
||
register Border *borderPtr = (Border *) border;
|
||
|
||
Tk_SetWindowBackground(tkwin, borderPtr->bgColorPtr->pixel);
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_GetRelief --
|
||
*
|
||
* Parse a relief description and return the corresponding
|
||
* relief value, or an error.
|
||
*
|
||
* Results:
|
||
* A standard Tcl return value. If all goes well then
|
||
* *reliefPtr is filled in with one of the values
|
||
* TK_RELIEF_RAISED, TK_RELIEF_FLAT, or TK_RELIEF_SUNKEN.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
int
|
||
Tk_GetRelief(interp, name, reliefPtr)
|
||
Tcl_Interp *interp; /* For error messages. */
|
||
char *name; /* Name of a relief type. */
|
||
int *reliefPtr; /* Where to store converted relief. */
|
||
{
|
||
char c;
|
||
int length;
|
||
|
||
c = name[0];
|
||
length = strlen(name);
|
||
if ((c == 'f') && (strncmp(name, "flat", length) == 0)) {
|
||
*reliefPtr = TK_RELIEF_FLAT;
|
||
} else if ((c == 'g') && (strncmp(name, "groove", length) == 0)
|
||
&& (length >= 2)) {
|
||
*reliefPtr = TK_RELIEF_GROOVE;
|
||
} else if ((c == 'r') && (strncmp(name, "raised", length) == 0)
|
||
&& (length >= 2)) {
|
||
*reliefPtr = TK_RELIEF_RAISED;
|
||
} else if ((c == 'r') && (strncmp(name, "ridge", length) == 0)) {
|
||
*reliefPtr = TK_RELIEF_RIDGE;
|
||
} else if ((c == 's') && (strncmp(name, "sunken", length) == 0)) {
|
||
*reliefPtr = TK_RELIEF_SUNKEN;
|
||
} else {
|
||
sprintf(interp->result, "bad relief type \"%.50s\": must be %s",
|
||
name, "flat, groove, raised, ridge, or sunken");
|
||
return TCL_ERROR;
|
||
}
|
||
return TCL_OK;
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* Tk_NameOfRelief --
|
||
*
|
||
* Given a relief value, produce a string describing that
|
||
* relief value.
|
||
*
|
||
* Results:
|
||
* The return value is a static string that is equivalent
|
||
* to relief.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
char *
|
||
Tk_NameOfRelief(relief)
|
||
int relief; /* One of TK_RELIEF_FLAT, TK_RELIEF_RAISED,
|
||
* or TK_RELIEF_SUNKEN. */
|
||
{
|
||
if (relief == TK_RELIEF_FLAT) {
|
||
return "flat";
|
||
} else if (relief == TK_RELIEF_SUNKEN) {
|
||
return "sunken";
|
||
} else if (relief == TK_RELIEF_RAISED) {
|
||
return "raised";
|
||
} else if (relief == TK_RELIEF_GROOVE) {
|
||
return "groove";
|
||
} else if (relief == TK_RELIEF_RIDGE) {
|
||
return "ridge";
|
||
} else {
|
||
return "unknown relief";
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* Tk_Draw3DPolygon --
|
||
*
|
||
* Draw a border with 3-D appearance around the edge of a
|
||
* given polygon.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information is drawn in "drawable" in the form of a
|
||
* 3-D border borderWidth units width wide on the left
|
||
* of the trajectory given by pointPtr and numPoints (or
|
||
* -borderWidth units wide on the right side, if borderWidth
|
||
* is negative).
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_Draw3DPolygon(display, drawable, border, pointPtr, numPoints,
|
||
borderWidth, leftRelief)
|
||
Display *display; /* X display in which to draw polygon. */
|
||
Drawable drawable; /* X window or pixmap in which to draw. */
|
||
Tk_3DBorder border; /* Token for border to draw. */
|
||
XPoint *pointPtr; /* Array of points describing
|
||
* polygon. All points must be
|
||
* absolute (CoordModeOrigin). */
|
||
int numPoints; /* Number of points at *pointPtr. */
|
||
int borderWidth; /* Width of border, measured in
|
||
* pixels to the left of the polygon's
|
||
* trajectory. May be negative. */
|
||
int leftRelief; /* TK_RELIEF_RAISED or
|
||
* TK_RELIEF_SUNKEN: indicates how
|
||
* stuff to left of trajectory looks
|
||
* relative to stuff on right. */
|
||
{
|
||
XPoint poly[4], b1, b2, newB1, newB2;
|
||
XPoint perp, c, shift1, shift2; /* Used for handling parallel lines. */
|
||
register XPoint *p1Ptr, *p2Ptr;
|
||
Border *borderPtr = (Border *) border;
|
||
GC gc;
|
||
int i, lightOnLeft, dx, dy, parallel, pointsSeen;
|
||
|
||
/*
|
||
* Handle grooves and ridges with recursive calls.
|
||
*/
|
||
|
||
if ((leftRelief == TK_RELIEF_GROOVE) || (leftRelief == TK_RELIEF_RIDGE)) {
|
||
int halfWidth;
|
||
|
||
halfWidth = borderWidth/2;
|
||
Tk_Draw3DPolygon(display, drawable, border, pointPtr, numPoints,
|
||
halfWidth, (leftRelief == TK_RELIEF_GROOVE) ? TK_RELIEF_RAISED
|
||
: TK_RELIEF_SUNKEN);
|
||
Tk_Draw3DPolygon(display, drawable, border, pointPtr, numPoints,
|
||
-halfWidth, (leftRelief == TK_RELIEF_GROOVE) ? TK_RELIEF_SUNKEN
|
||
: TK_RELIEF_RAISED);
|
||
return;
|
||
}
|
||
|
||
/*
|
||
* If the polygon is already closed, drop the last point from it
|
||
* (we'll close it automatically).
|
||
*/
|
||
|
||
p1Ptr = &pointPtr[numPoints-1];
|
||
p2Ptr = &pointPtr[0];
|
||
if ((p1Ptr->x == p2Ptr->x) && (p1Ptr->y == p2Ptr->y)) {
|
||
numPoints--;
|
||
}
|
||
|
||
/*
|
||
* The loop below is executed once for each vertex in the polgon.
|
||
* At the beginning of each iteration things look like this:
|
||
*
|
||
* poly[1] /
|
||
* * /
|
||
* | /
|
||
* b1 * poly[0] (pointPtr[i-1])
|
||
* | |
|
||
* | |
|
||
* | |
|
||
* | |
|
||
* | |
|
||
* | | *p1Ptr *p2Ptr
|
||
* b2 *--------------------*
|
||
* |
|
||
* |
|
||
* x-------------------------
|
||
*
|
||
* The job of this iteration is to do the following:
|
||
* (a) Compute x (the border corner corresponding to
|
||
* pointPtr[i]) and put it in poly[2]. As part of
|
||
* this, compute a new b1 and b2 value for the next
|
||
* side of the polygon.
|
||
* (b) Put pointPtr[i] into poly[3].
|
||
* (c) Draw the polygon given by poly[0..3].
|
||
* (d) Advance poly[0], poly[1], b1, and b2 for the
|
||
* next side of the polygon.
|
||
*/
|
||
|
||
/*
|
||
* The above situation doesn't first come into existence until
|
||
* two points have been processed; the first two points are
|
||
* used to "prime the pump", so some parts of the processing
|
||
* are ommitted for these points. The variable "pointsSeen"
|
||
* keeps track of the priming process; it has to be separate
|
||
* from i in order to be able to ignore duplicate points in the
|
||
* polygon.
|
||
*/
|
||
|
||
pointsSeen = 0;
|
||
for (i = -2, p1Ptr = &pointPtr[numPoints-2], p2Ptr = p1Ptr+1;
|
||
i < numPoints; i++, p1Ptr = p2Ptr, p2Ptr++) {
|
||
if ((i == -1) || (i == numPoints-1)) {
|
||
p2Ptr = pointPtr;
|
||
}
|
||
if ((p2Ptr->x == p1Ptr->x) && (p2Ptr->y == p1Ptr->y)) {
|
||
/*
|
||
* Ignore duplicate points (they'd cause core dumps in
|
||
* ShiftLine calls below).
|
||
*/
|
||
continue;
|
||
}
|
||
ShiftLine(p1Ptr, p2Ptr, borderWidth, &newB1);
|
||
newB2.x = newB1.x + (p2Ptr->x - p1Ptr->x);
|
||
newB2.y = newB1.y + (p2Ptr->y - p1Ptr->y);
|
||
poly[3] = *p1Ptr;
|
||
parallel = 0;
|
||
if (pointsSeen >= 1) {
|
||
parallel = Intersect(&newB1, &newB2, &b1, &b2, &poly[2]);
|
||
|
||
/*
|
||
* If two consecutive segments of the polygon are parallel,
|
||
* then things get more complex. Consider the following
|
||
* diagram:
|
||
*
|
||
* poly[1]
|
||
* *----b1-----------b2------a
|
||
* \
|
||
* \
|
||
* *---------*----------* b
|
||
* poly[0] *p2Ptr *p1Ptr /
|
||
* /
|
||
* --*--------*----c
|
||
* newB1 newB2
|
||
*
|
||
* Instead of using x and *p1Ptr for poly[2] and poly[3], as
|
||
* in the original diagram, use a and b as above. Then instead
|
||
* of using x and *p1Ptr for the new poly[0] and poly[1], use
|
||
* b and c as above.
|
||
*
|
||
* Do the computation in three stages:
|
||
* 1. Compute a point "perp" such that the line p1Ptr-perp
|
||
* is perpendicular to p1Ptr-p2Ptr.
|
||
* 2. Compute the points a and c by intersecting the lines
|
||
* b1-b2 and newB1-newB2 with p1Ptr-perp.
|
||
* 3. Compute b by shifting p1Ptr-perp to the right and
|
||
* intersecting it with p1Ptr-p2Ptr.
|
||
*/
|
||
|
||
if (parallel) {
|
||
perp.x = p1Ptr->x + (p2Ptr->y - p1Ptr->y);
|
||
perp.y = p1Ptr->y - (p2Ptr->x - p1Ptr->x);
|
||
(void) Intersect(p1Ptr, &perp, &b1, &b2, &poly[2]);
|
||
(void) Intersect(p1Ptr, &perp, &newB1, &newB2, &c);
|
||
ShiftLine(p1Ptr, &perp, borderWidth, &shift1);
|
||
shift2.x = shift1.x + (perp.x - p1Ptr->x);
|
||
shift2.y = shift1.y + (perp.y - p1Ptr->y);
|
||
(void) Intersect(p1Ptr, p2Ptr, &shift1, &shift2, &poly[3]);
|
||
}
|
||
}
|
||
if (pointsSeen >= 2) {
|
||
dx = poly[3].x - poly[0].x;
|
||
dy = poly[3].y - poly[0].y;
|
||
if (dx > 0) {
|
||
lightOnLeft = (dy <= dx);
|
||
} else {
|
||
lightOnLeft = (dy < dx);
|
||
}
|
||
if (lightOnLeft ^ (leftRelief == TK_RELIEF_RAISED)) {
|
||
gc = borderPtr->lightGC;
|
||
} else {
|
||
gc = borderPtr->darkGC;
|
||
}
|
||
XFillPolygon(display, drawable, gc, poly, 4, Convex,
|
||
CoordModeOrigin);
|
||
}
|
||
b1.x = newB1.x;
|
||
b1.y = newB1.y;
|
||
b2.x = newB2.x;
|
||
b2.y = newB2.y;
|
||
poly[0].x = poly[3].x;
|
||
poly[0].y = poly[3].y;
|
||
if (parallel) {
|
||
poly[1].x = c.x;
|
||
poly[1].y = c.y;
|
||
} else if (pointsSeen >= 1) {
|
||
poly[1].x = poly[2].x;
|
||
poly[1].y = poly[2].y;
|
||
}
|
||
pointsSeen++;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_Fill3DRectangle --
|
||
*
|
||
* Fill a rectangular area, supplying a 3D border if desired.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information gets drawn on the screen.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_Fill3DRectangle(display, drawable, border, x, y, width,
|
||
height, borderWidth, relief)
|
||
Display *display; /* X display in which to draw rectangle. */
|
||
Drawable drawable; /* X window or pixmap in which to draw. */
|
||
Tk_3DBorder border; /* Token for border to draw. */
|
||
int x, y, width, height; /* Outside area of rectangular region. */
|
||
int borderWidth; /* Desired width for border, in
|
||
* pixels. Border will be *inside* region. */
|
||
int relief; /* Indicates 3D effect: TK_RELIEF_FLAT,
|
||
* TK_RELIEF_RAISED, or TK_RELIEF_SUNKEN. */
|
||
{
|
||
register Border *borderPtr = (Border *) border;
|
||
|
||
XFillRectangle(display, drawable, borderPtr->bgGC,
|
||
x, y, (unsigned int) width, (unsigned int) height);
|
||
if (relief != TK_RELIEF_FLAT) {
|
||
Tk_Draw3DRectangle(display, drawable, border, x, y, width,
|
||
height, borderWidth, relief);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*----------------------------------------------------------------------
|
||
*
|
||
* Tk_Fill3DPolygon --
|
||
*
|
||
* Fill a polygonal area, supplying a 3D border if desired.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Information gets drawn on the screen.
|
||
*
|
||
*----------------------------------------------------------------------
|
||
*/
|
||
|
||
void
|
||
Tk_Fill3DPolygon(display, drawable, border, pointPtr, numPoints,
|
||
borderWidth, leftRelief)
|
||
Display *display; /* X display in which to draw polygon. */
|
||
Drawable drawable; /* X window or pixmap in which to draw. */
|
||
Tk_3DBorder border; /* Token for border to draw. */
|
||
XPoint *pointPtr; /* Array of points describing
|
||
* polygon. All points must be
|
||
* absolute (CoordModeOrigin). */
|
||
int numPoints; /* Number of points at *pointPtr. */
|
||
int borderWidth; /* Width of border, measured in
|
||
* pixels to the left of the polygon's
|
||
* trajectory. May be negative. */
|
||
int leftRelief; /* Indicates 3D effect of left side of
|
||
* trajectory relative to right:
|
||
* TK_RELIEF_FLAT, TK_RELIEF_RAISED,
|
||
* or TK_RELIEF_SUNKEN. */
|
||
{
|
||
register Border *borderPtr = (Border *) border;
|
||
|
||
XFillPolygon(display, drawable, borderPtr->bgGC,
|
||
pointPtr, numPoints, Complex, CoordModeOrigin);
|
||
if (leftRelief != TK_RELIEF_FLAT) {
|
||
Tk_Draw3DPolygon(display, drawable, border, pointPtr, numPoints,
|
||
borderWidth, leftRelief);
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* BorderInit --
|
||
*
|
||
* Initialize the structures used for border management.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* Read the code.
|
||
*
|
||
*-------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
BorderInit()
|
||
{
|
||
initialized = 1;
|
||
Tcl_InitHashTable(&borderTable, sizeof(BorderKey)/sizeof(int));
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* ShiftLine --
|
||
*
|
||
* Given two points on a line, compute a point on a
|
||
* new line that is parallel to the given line and
|
||
* a given distance away from it.
|
||
*
|
||
* Results:
|
||
* None.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static void
|
||
ShiftLine(p1Ptr, p2Ptr, distance, p3Ptr)
|
||
XPoint *p1Ptr; /* First point on line. */
|
||
XPoint *p2Ptr; /* Second point on line. */
|
||
int distance; /* New line is to be this many
|
||
* units to the left of original
|
||
* line, when looking from p1 to
|
||
* p2. May be negative. */
|
||
XPoint *p3Ptr; /* Store coords of point on new
|
||
* line here. */
|
||
{
|
||
int dx, dy, dxNeg, dyNeg;
|
||
|
||
/*
|
||
* The table below is used for a quick approximation in
|
||
* computing the new point. An index into the table
|
||
* is 128 times the slope of the original line (the slope
|
||
* must always be between 0 and 1). The value of the table
|
||
* entry is 128 times the amount to displace the new line
|
||
* in y for each unit of perpendicular distance. In other
|
||
* words, the table maps from the tangent of an angle to
|
||
* the inverse of its cosine. If the slope of the original
|
||
* line is greater than 1, then the displacement is done in
|
||
* x rather than in y.
|
||
*/
|
||
|
||
static int shiftTable[129];
|
||
|
||
/*
|
||
* Initialize the table if this is the first time it is
|
||
* used.
|
||
*/
|
||
|
||
if (shiftTable[0] == 0) {
|
||
int i;
|
||
double tangent, cosine;
|
||
|
||
for (i = 0; i <= 128; i++) {
|
||
tangent = i/128.0;
|
||
cosine = 128/cos(atan(tangent)) + .5;
|
||
shiftTable[i] = cosine;
|
||
}
|
||
}
|
||
|
||
*p3Ptr = *p1Ptr;
|
||
dx = p2Ptr->x - p1Ptr->x;
|
||
dy = p2Ptr->y - p1Ptr->y;
|
||
if (dy < 0) {
|
||
dyNeg = 1;
|
||
dy = -dy;
|
||
} else {
|
||
dyNeg = 0;
|
||
}
|
||
if (dx < 0) {
|
||
dxNeg = 1;
|
||
dx = -dx;
|
||
} else {
|
||
dxNeg = 0;
|
||
}
|
||
if (dy <= dx) {
|
||
dy = ((distance * shiftTable[(dy<<7)/dx]) + 64) >> 7;
|
||
if (!dxNeg) {
|
||
dy = -dy;
|
||
}
|
||
p3Ptr->y += dy;
|
||
} else {
|
||
dx = ((distance * shiftTable[(dx<<7)/dy]) + 64) >> 7;
|
||
if (dyNeg) {
|
||
dx = -dx;
|
||
}
|
||
p3Ptr->x += dx;
|
||
}
|
||
}
|
||
|
||
/*
|
||
*--------------------------------------------------------------
|
||
*
|
||
* Intersect --
|
||
*
|
||
* Find the intersection point between two lines.
|
||
*
|
||
* Results:
|
||
* Under normal conditions 0 is returned and the point
|
||
* at *iPtr is filled in with the intersection between
|
||
* the two lines. If the two lines are parallel, then
|
||
* -1 is returned and *iPtr isn't modified.
|
||
*
|
||
* Side effects:
|
||
* None.
|
||
*
|
||
*--------------------------------------------------------------
|
||
*/
|
||
|
||
static int
|
||
Intersect(a1Ptr, a2Ptr, b1Ptr, b2Ptr, iPtr)
|
||
XPoint *a1Ptr; /* First point of first line. */
|
||
XPoint *a2Ptr; /* Second point of first line. */
|
||
XPoint *b1Ptr; /* First point of second line. */
|
||
XPoint *b2Ptr; /* Second point of second line. */
|
||
XPoint *iPtr; /* Filled in with intersection point. */
|
||
{
|
||
int dxadyb, dxbdya, dxadxb, dyadyb, p, q;
|
||
|
||
/*
|
||
* The code below is just a straightforward manipulation of two
|
||
* equations of the form y = (x-x1)*(y2-y1)/(x2-x1) + y1 to solve
|
||
* for the x-coordinate of intersection, then the y-coordinate.
|
||
*/
|
||
|
||
dxadyb = (a2Ptr->x - a1Ptr->x)*(b2Ptr->y - b1Ptr->y);
|
||
dxbdya = (b2Ptr->x - b1Ptr->x)*(a2Ptr->y - a1Ptr->y);
|
||
dxadxb = (a2Ptr->x - a1Ptr->x)*(b2Ptr->x - b1Ptr->x);
|
||
dyadyb = (a2Ptr->y - a1Ptr->y)*(b2Ptr->y - b1Ptr->y);
|
||
|
||
if (dxadyb == dxbdya) {
|
||
return -1;
|
||
}
|
||
p = (a1Ptr->x*dxbdya - b1Ptr->x*dxadyb + (b1Ptr->y - a1Ptr->y)*dxadxb);
|
||
q = dxbdya - dxadyb;
|
||
if (q < 0) {
|
||
p = -p;
|
||
q = -q;
|
||
}
|
||
if (p < 0) {
|
||
iPtr->x = - ((-p + q/2)/q);
|
||
} else {
|
||
iPtr->x = (p + q/2)/q;
|
||
}
|
||
p = (a1Ptr->y*dxadyb - b1Ptr->y*dxbdya + (b1Ptr->x - a1Ptr->x)*dyadyb);
|
||
q = dxadyb - dxbdya;
|
||
if (q < 0) {
|
||
p = -p;
|
||
q = -q;
|
||
}
|
||
if (p < 0) {
|
||
iPtr->y = - ((-p + q/2)/q);
|
||
} else {
|
||
iPtr->y = (p + q/2)/q;
|
||
}
|
||
return 0;
|
||
}
|