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Diffstat (limited to 'tk8.6/generic/tk3d.c')
| -rw-r--r-- | tk8.6/generic/tk3d.c | 1398 |
1 files changed, 0 insertions, 1398 deletions
diff --git a/tk8.6/generic/tk3d.c b/tk8.6/generic/tk3d.c deleted file mode 100644 index 87ddf76..0000000 --- a/tk8.6/generic/tk3d.c +++ /dev/null @@ -1,1398 +0,0 @@ -/* - * tk3d.c -- - * - * This module provides procedures to draw borders in the - * three-dimensional Motif style. - * - * Copyright (c) 1990-1994 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. - */ - -#include "tkInt.h" -#include "tk3d.h" - -/* - * The following table defines the string values for reliefs, which are used - * by Tk_GetReliefFromObj. - */ - -static const char *const reliefStrings[] = { - "flat", "groove", "raised", "ridge", "solid", "sunken", NULL -}; - -/* - * Forward declarations for functions defined in this file: - */ - -static void BorderInit(TkDisplay *dispPtr); -static void DupBorderObjProc(Tcl_Obj *srcObjPtr, - Tcl_Obj *dupObjPtr); -static void FreeBorderObj(Tcl_Obj *objPtr); -static void FreeBorderObjProc(Tcl_Obj *objPtr); -static int Intersect(XPoint *a1Ptr, XPoint *a2Ptr, - XPoint *b1Ptr, XPoint *b2Ptr, XPoint *iPtr); -static void InitBorderObj(Tcl_Obj *objPtr); -static void ShiftLine(XPoint *p1Ptr, XPoint *p2Ptr, - int distance, XPoint *p3Ptr); - -/* - * The following structure defines the implementation of the "border" Tcl - * object, used for drawing. The border object remembers the hash table entry - * associated with a border. The actual allocation and deallocation of the - * border should be done by the configuration package when the border option - * is set. - */ - -const Tcl_ObjType tkBorderObjType = { - "border", /* name */ - FreeBorderObjProc, /* freeIntRepProc */ - DupBorderObjProc, /* dupIntRepProc */ - NULL, /* updateStringProc */ - NULL /* setFromAnyProc */ -}; - -/* - *---------------------------------------------------------------------- - * - * Tk_Alloc3DBorderFromObj -- - * - * Given a Tcl_Obj *, map the value to a corresponding Tk_3DBorder - * structure based on the tkwin given. - * - * Results: - * The return value is a token for a data structure describing a 3-D - * border. This token may be passed to functions such as - * Tk_Draw3DRectangle and Tk_Free3DBorder. If an error prevented the - * border from being created then NULL is returned and an error message - * will be left in the interp's result. - * - * Side effects: - * The border is added to an internal database with a reference count. - * For each call to this function, there should eventually be a call to - * FreeBorderObj so that the database is cleaned up when borders aren't - * in use anymore. - * - *---------------------------------------------------------------------- - */ - -Tk_3DBorder -Tk_Alloc3DBorderFromObj( - Tcl_Interp *interp, /* Interp for error results. */ - Tk_Window tkwin, /* Need the screen the border is used on.*/ - Tcl_Obj *objPtr) /* Object giving name of color for window - * background. */ -{ - TkBorder *borderPtr; - - if (objPtr->typePtr != &tkBorderObjType) { - InitBorderObj(objPtr); - } - borderPtr = objPtr->internalRep.twoPtrValue.ptr1; - - /* - * If the object currently points to a TkBorder, see if it's the one we - * want. If so, increment its reference count and return. - */ - - if (borderPtr != NULL) { - if (borderPtr->resourceRefCount == 0) { - /* - * This is a stale reference: it refers to a border that's no - * longer in use. Clear the reference. - */ - - FreeBorderObj(objPtr); - borderPtr = NULL; - } else if ((Tk_Screen(tkwin) == borderPtr->screen) - && (Tk_Colormap(tkwin) == borderPtr->colormap)) { - borderPtr->resourceRefCount++; - return (Tk_3DBorder) borderPtr; - } - } - - /* - * The object didn't point to the border that we wanted. Search the list - * of borders with the same name to see if one of the others is the right - * one. - * - * If the cached value is NULL, either the object type was not a color - * going in, or the object is a color type but had previously been freed. - * - * If the value is not NULL, the internal rep is the value of the color - * the last time this object was accessed. Check the screen and colormap - * of the last access, and if they match, we are done. - */ - - if (borderPtr != NULL) { - TkBorder *firstBorderPtr = Tcl_GetHashValue(borderPtr->hashPtr); - - FreeBorderObj(objPtr); - for (borderPtr = firstBorderPtr ; borderPtr != NULL; - borderPtr = borderPtr->nextPtr) { - if ((Tk_Screen(tkwin) == borderPtr->screen) - && (Tk_Colormap(tkwin) == borderPtr->colormap)) { - borderPtr->resourceRefCount++; - borderPtr->objRefCount++; - objPtr->internalRep.twoPtrValue.ptr1 = borderPtr; - return (Tk_3DBorder) borderPtr; - } - } - } - - /* - * Still no luck. Call Tk_Get3DBorder to allocate a new border. - */ - - borderPtr = (TkBorder *) Tk_Get3DBorder(interp, tkwin, - Tcl_GetString(objPtr)); - objPtr->internalRep.twoPtrValue.ptr1 = borderPtr; - if (borderPtr != NULL) { - borderPtr->objRefCount++; - } - return (Tk_3DBorder) borderPtr; -} - -/* - *-------------------------------------------------------------- - * - * Tk_Get3DBorder -- - * - * Create a data structure for displaying a 3-D border. - * - * Results: - * The return value is a token for a data structure describing a 3-D - * border. This token may be passed to functions such as - * Tk_Draw3DRectangle and Tk_Free3DBorder. If an error prevented the - * border from being created then NULL is returned and an error message - * will be left in the interp's result. - * - * Side effects: - * Data structures, graphics contexts, etc. are allocated. It is the - * caller's responsibility to eventually call Tk_Free3DBorder to release - * the resources. - * - *-------------------------------------------------------------- - */ - -Tk_3DBorder -Tk_Get3DBorder( - Tcl_Interp *interp, /* Place to store an error message. */ - Tk_Window tkwin, /* Token for window in which border will be - * drawn. */ - Tk_Uid colorName) /* String giving name of color for window - * background. */ -{ - Tcl_HashEntry *hashPtr; - TkBorder *borderPtr, *existingBorderPtr; - int isNew; - XGCValues gcValues; - XColor *bgColorPtr; - TkDisplay *dispPtr; - - dispPtr = ((TkWindow *) tkwin)->dispPtr; - - if (!dispPtr->borderInit) { - BorderInit(dispPtr); - } - - hashPtr = Tcl_CreateHashEntry(&dispPtr->borderTable, colorName, &isNew); - if (!isNew) { - existingBorderPtr = Tcl_GetHashValue(hashPtr); - for (borderPtr = existingBorderPtr; borderPtr != NULL; - borderPtr = borderPtr->nextPtr) { - if ((Tk_Screen(tkwin) == borderPtr->screen) - && (Tk_Colormap(tkwin) == borderPtr->colormap)) { - borderPtr->resourceRefCount++; - return (Tk_3DBorder) borderPtr; - } - } - } else { - existingBorderPtr = NULL; - } - - /* - * No satisfactory border exists yet. Initialize a new one. - */ - - bgColorPtr = Tk_GetColor(interp, tkwin, colorName); - if (bgColorPtr == NULL) { - if (isNew) { - Tcl_DeleteHashEntry(hashPtr); - } - return NULL; - } - - borderPtr = TkpGetBorder(); - borderPtr->screen = Tk_Screen(tkwin); - borderPtr->visual = Tk_Visual(tkwin); - borderPtr->depth = Tk_Depth(tkwin); - borderPtr->colormap = Tk_Colormap(tkwin); - borderPtr->resourceRefCount = 1; - borderPtr->objRefCount = 0; - borderPtr->bgColorPtr = bgColorPtr; - borderPtr->darkColorPtr = NULL; - borderPtr->lightColorPtr = NULL; - borderPtr->shadow = None; - borderPtr->bgGC = None; - borderPtr->darkGC = None; - borderPtr->lightGC = None; - borderPtr->hashPtr = hashPtr; - borderPtr->nextPtr = existingBorderPtr; - Tcl_SetHashValue(hashPtr, borderPtr); - - /* - * Create the information for displaying the background color, but delay - * the allocation of shadows until they are actually needed for drawing. - */ - - gcValues.foreground = borderPtr->bgColorPtr->pixel; - borderPtr->bgGC = Tk_GetGC(tkwin, GCForeground, &gcValues); - return (Tk_3DBorder) borderPtr; -} - -/* - *-------------------------------------------------------------- - * - * Tk_Draw3DRectangle -- - * - * Draw a 3-D border at a given place in a given window. - * - * Results: - * None. - * - * Side effects: - * A 3-D border will be drawn in the indicated drawable. The outside - * edges of the border will be determined by x, y, width, and height. The - * inside edges of the border will be determined by the borderWidth - * argument. - * - *-------------------------------------------------------------- - */ - -void -Tk_Draw3DRectangle( - Tk_Window tkwin, /* Window for which border was allocated. */ - Drawable drawable, /* X window or pixmap in which to draw. */ - Tk_3DBorder border, /* Token for border to draw. */ - int x, int y, int width, int height, - /* Outside area of region in which border will - * be drawn. */ - int borderWidth, /* Desired width for border, in pixels. */ - int relief) /* Type of relief: TK_RELIEF_RAISED, - * TK_RELIEF_SUNKEN, TK_RELIEF_GROOVE, etc. */ -{ - if (width < 2*borderWidth) { - borderWidth = width/2; - } - if (height < 2*borderWidth) { - borderWidth = height/2; - } - Tk_3DVerticalBevel(tkwin, drawable, border, x, y, borderWidth, height, - 1, relief); - Tk_3DVerticalBevel(tkwin, drawable, border, x+width-borderWidth, y, - borderWidth, height, 0, relief); - Tk_3DHorizontalBevel(tkwin, drawable, border, x, y, width, borderWidth, - 1, 1, 1, relief); - Tk_3DHorizontalBevel(tkwin, drawable, border, x, y+height-borderWidth, - width, borderWidth, 0, 0, 0, relief); -} - -/* - *-------------------------------------------------------------- - * - * 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. - * - *-------------------------------------------------------------- - */ - -const char * -Tk_NameOf3DBorder( - Tk_3DBorder border) /* Token for border. */ -{ - TkBorder *borderPtr = (TkBorder *) border; - - return borderPtr->hashPtr->key.string; -} - -/* - *-------------------------------------------------------------------- - * - * 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( - Tk_3DBorder border) /* Border whose color is wanted. */ -{ - return ((TkBorder *) border)->bgColorPtr; -} - -/* - *-------------------------------------------------------------------- - * - * Tk_3DBorderGC -- - * - * Given a 3D border, returns one of the graphics contexts used to draw - * the border. - * - * Results: - * Returns the graphics context given by the "which" argument. - * - * Side effects: - * None. - * - *-------------------------------------------------------------------- - */ -GC -Tk_3DBorderGC( - Tk_Window tkwin, /* Window for which border was allocated. */ - Tk_3DBorder border, /* Border whose GC is wanted. */ - int which) /* Selects one of the border's 3 GC's: - * TK_3D_FLAT_GC, TK_3D_LIGHT_GC, or - * TK_3D_DARK_GC. */ -{ - TkBorder * borderPtr = (TkBorder *) border; - - if ((borderPtr->lightGC == None) && (which != TK_3D_FLAT_GC)) { - TkpGetShadows(borderPtr, tkwin); - } - if (which == TK_3D_FLAT_GC) { - return borderPtr->bgGC; - } else if (which == TK_3D_LIGHT_GC) { - return borderPtr->lightGC; - } else if (which == TK_3D_DARK_GC){ - return borderPtr->darkGC; - } - Tcl_Panic("bogus \"which\" value in Tk_3DBorderGC"); - - /* - * The code below will never be executed, but it's needed to keep - * compilers happy. - */ - - return (GC) None; -} - -/* - *-------------------------------------------------------------- - * - * Tk_Free3DBorder -- - * - * This function 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( - Tk_3DBorder border) /* Token for border to be released. */ -{ - TkBorder *borderPtr = (TkBorder *) border; - Display *display = DisplayOfScreen(borderPtr->screen); - TkBorder *prevPtr; - - borderPtr->resourceRefCount--; - if (borderPtr->resourceRefCount > 0) { - return; - } - - prevPtr = Tcl_GetHashValue(borderPtr->hashPtr); - TkpFreeBorder(borderPtr); - if (borderPtr->bgColorPtr != NULL) { - Tk_FreeColor(borderPtr->bgColorPtr); - } - if (borderPtr->darkColorPtr != NULL) { - Tk_FreeColor(borderPtr->darkColorPtr); - } - if (borderPtr->lightColorPtr != NULL) { - Tk_FreeColor(borderPtr->lightColorPtr); - } - if (borderPtr->shadow != None) { - Tk_FreeBitmap(display, borderPtr->shadow); - } - if (borderPtr->bgGC != None) { - Tk_FreeGC(display, borderPtr->bgGC); - } - if (borderPtr->darkGC != None) { - Tk_FreeGC(display, borderPtr->darkGC); - } - if (borderPtr->lightGC != None) { - Tk_FreeGC(display, borderPtr->lightGC); - } - if (prevPtr == borderPtr) { - if (borderPtr->nextPtr == NULL) { - Tcl_DeleteHashEntry(borderPtr->hashPtr); - } else { - Tcl_SetHashValue(borderPtr->hashPtr, borderPtr->nextPtr); - } - } else { - while (prevPtr->nextPtr != borderPtr) { - prevPtr = prevPtr->nextPtr; - } - prevPtr->nextPtr = borderPtr->nextPtr; - } - if (borderPtr->objRefCount == 0) { - ckfree(borderPtr); - } -} - -/* - *---------------------------------------------------------------------- - * - * Tk_Free3DBorderFromObj -- - * - * This function is called to release a border allocated by - * Tk_Alloc3DBorderFromObj. It does not throw away the Tcl_Obj *; it only - * gets rid of the hash table entry for this border and clears the cached - * value that is normally stored in the object. - * - * Results: - * None. - * - * Side effects: - * The reference count associated with the border represented by objPtr - * is decremented, and the border's resources are released to X if there - * are no remaining uses for it. - * - *---------------------------------------------------------------------- - */ - -void -Tk_Free3DBorderFromObj( - Tk_Window tkwin, /* The window this border lives in. Needed for - * the screen and colormap values. */ - Tcl_Obj *objPtr) /* The Tcl_Obj * to be freed. */ -{ - Tk_Free3DBorder(Tk_Get3DBorderFromObj(tkwin, objPtr)); - FreeBorderObj(objPtr); -} - -/* - *--------------------------------------------------------------------------- - * - * FreeBorderObjProc, FreeBorderObj -- - * - * This proc is called to release an object reference to a border. Called - * when the object's internal rep is released or when the cached - * borderPtr needs to be changed. - * - * Results: - * None. - * - * Side effects: - * The object reference count is decremented. When both it and the hash - * ref count go to zero, the border's resources are released. - * - *--------------------------------------------------------------------------- - */ - -static void -FreeBorderObjProc( - Tcl_Obj *objPtr) /* The object we are releasing. */ -{ - FreeBorderObj(objPtr); - objPtr->typePtr = NULL; -} - -static void -FreeBorderObj( - Tcl_Obj *objPtr) /* The object we are releasing. */ -{ - TkBorder *borderPtr = objPtr->internalRep.twoPtrValue.ptr1; - - if (borderPtr != NULL) { - borderPtr->objRefCount--; - if ((borderPtr->objRefCount == 0) - && (borderPtr->resourceRefCount == 0)) { - ckfree(borderPtr); - } - objPtr->internalRep.twoPtrValue.ptr1 = NULL; - } -} - -/* - *--------------------------------------------------------------------------- - * - * DupBorderObjProc -- - * - * When a cached border object is duplicated, this is called to update - * the internal reps. - * - * Results: - * None. - * - * Side effects: - * The border's objRefCount is incremented and the internal rep of the - * copy is set to point to it. - * - *--------------------------------------------------------------------------- - */ - -static void -DupBorderObjProc( - Tcl_Obj *srcObjPtr, /* The object we are copying from. */ - Tcl_Obj *dupObjPtr) /* The object we are copying to. */ -{ - TkBorder *borderPtr = srcObjPtr->internalRep.twoPtrValue.ptr1; - - dupObjPtr->typePtr = srcObjPtr->typePtr; - dupObjPtr->internalRep.twoPtrValue.ptr1 = borderPtr; - - if (borderPtr != NULL) { - borderPtr->objRefCount++; - } -} - -/* - *---------------------------------------------------------------------- - * - * 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( - Tk_Window tkwin, /* Window whose background is to be set. */ - Tk_3DBorder border) /* Token for border. */ -{ - register TkBorder *borderPtr = (TkBorder *) border; - - Tk_SetWindowBackground(tkwin, borderPtr->bgColorPtr->pixel); -} - -/* - *---------------------------------------------------------------------- - * - * Tk_GetReliefFromObj -- - * - * Return an integer value based on the value of the objPtr. - * - * Results: - * The return value is a standard Tcl result. If an error occurs during - * conversion, an error message is left in the interpreter's result - * unless "interp" is NULL. - * - * Side effects: - * The object gets converted by Tcl_GetIndexFromObj. - * - *---------------------------------------------------------------------- - */ - -int -Tk_GetReliefFromObj( - Tcl_Interp *interp, /* Used for error reporting. */ - Tcl_Obj *objPtr, /* The object we are trying to get the value - * from. */ - int *resultPtr) /* Where to place the answer. */ -{ - return Tcl_GetIndexFromObjStruct(interp, objPtr, reliefStrings, - sizeof(char *), "relief", 0, resultPtr); -} - -/* - *---------------------------------------------------------------------- - * - * 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( - Tcl_Interp *interp, /* For error messages. */ - const char *name, /* Name of a relief type. */ - int *reliefPtr) /* Where to store converted relief. */ -{ - char c; - size_t 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, "solid", length) == 0)) { - *reliefPtr = TK_RELIEF_SOLID; - } else if ((c == 's') && (strncmp(name, "sunken", length) == 0)) { - *reliefPtr = TK_RELIEF_SUNKEN; - } else { - Tcl_SetObjResult(interp, - Tcl_ObjPrintf("bad relief \"%.50s\": must be %s", - name, "flat, groove, raised, ridge, solid, or sunken")); - Tcl_SetErrorCode(interp, "TK", "VALUE", "RELIEF", NULL); - 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. - * - *-------------------------------------------------------------- - */ - -const char * -Tk_NameOfRelief( - 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 if (relief == TK_RELIEF_SOLID) { - return "solid"; - } else if (relief == TK_RELIEF_NULL) { - return ""; - } 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( - Tk_Window tkwin, /* Window for which border was allocated. */ - 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; - TkBorder *borderPtr = (TkBorder *) border; - GC gc; - int i, lightOnLeft, dx, dy, parallel, pointsSeen; - Display *display = Tk_Display(tkwin); - - if (borderPtr->lightGC == None) { - TkpGetShadows(borderPtr, tkwin); - } - - /* - * Handle grooves and ridges with recursive calls. - */ - - if ((leftRelief == TK_RELIEF_GROOVE) || (leftRelief == TK_RELIEF_RIDGE)) { - int halfWidth = borderWidth/2; - - Tk_Draw3DPolygon(tkwin, drawable, border, pointPtr, numPoints, - halfWidth, (leftRelief == TK_RELIEF_GROOVE) ? TK_RELIEF_RAISED - : TK_RELIEF_SUNKEN); - Tk_Draw3DPolygon(tkwin, 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( - Tk_Window tkwin, /* Window for which border was allocated. */ - Drawable drawable, /* X window or pixmap in which to draw. */ - Tk_3DBorder border, /* Token for border to draw. */ - int x, int y, int width, int 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 TkBorder *borderPtr = (TkBorder *) border; - int doubleBorder; - - /* - * This code is slightly tricky because it only draws the background in - * areas not covered by the 3D border. This avoids flashing effects on the - * screen for the border region. - */ - - if (relief == TK_RELIEF_FLAT) { - borderWidth = 0; - } else { - /* - * We need to make this extra check, otherwise we will leave garbage - * in thin frames [Bug: 3596] - */ - - if (width < 2*borderWidth) { - borderWidth = width/2; - } - if (height < 2*borderWidth) { - borderWidth = height/2; - } - } - doubleBorder = 2*borderWidth; - - if ((width > doubleBorder) && (height > doubleBorder)) { - XFillRectangle(Tk_Display(tkwin), drawable, borderPtr->bgGC, - x + borderWidth, y + borderWidth, - (unsigned) (width - doubleBorder), - (unsigned) (height - doubleBorder)); - } - if (borderWidth) { - Tk_Draw3DRectangle(tkwin, 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( - Tk_Window tkwin, /* Window for which border was allocated. */ - 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 TkBorder *borderPtr = (TkBorder *) border; - - XFillPolygon(Tk_Display(tkwin), drawable, borderPtr->bgGC, - pointPtr, numPoints, Complex, CoordModeOrigin); - if (leftRelief != TK_RELIEF_FLAT) { - Tk_Draw3DPolygon(tkwin, drawable, border, pointPtr, numPoints, - borderWidth, leftRelief); - } -} - -/* - *-------------------------------------------------------------- - * - * BorderInit -- - * - * Initialize the structures used for border management. - * - * Results: - * None. - * - * Side effects: - * Read the code. - * - *------------------------------------------------------------- - */ - -static void -BorderInit( - TkDisplay *dispPtr) /* Used to access thread-specific data. */ -{ - dispPtr->borderInit = 1; - Tcl_InitHashTable(&dispPtr->borderTable, TCL_STRING_KEYS); -} - -/* - *-------------------------------------------------------------- - * - * 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( - 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; - static int shiftTable[129]; /* 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. */ - - /* - * 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] = (int) 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( - 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; -} - -/* - *---------------------------------------------------------------------- - * - * Tk_Get3DBorderFromObj -- - * - * Returns the border referred to by a Tcl object. The border must - * already have been allocated via a call to Tk_Alloc3DBorderFromObj or - * Tk_Get3DBorder. - * - * Results: - * Returns the Tk_3DBorder that matches the tkwin and the string rep of - * the name of the border given in objPtr. - * - * Side effects: - * If the object is not already a border, the conversion will free any - * old internal representation. - * - *---------------------------------------------------------------------- - */ - -Tk_3DBorder -Tk_Get3DBorderFromObj( - Tk_Window tkwin, - Tcl_Obj *objPtr) /* The object whose string value selects a - * border. */ -{ - TkBorder *borderPtr = NULL; - Tcl_HashEntry *hashPtr; - TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr; - - if (objPtr->typePtr != &tkBorderObjType) { - InitBorderObj(objPtr); - } - - /* - * If we are lucky (and the user doesn't use too many different displays, - * screens, or colormaps...) then the TkBorder structure we need will be - * cached in the internal representation of the Tcl_Obj. Check it out... - */ - - borderPtr = objPtr->internalRep.twoPtrValue.ptr1; - if ((borderPtr != NULL) - && (borderPtr->resourceRefCount > 0) - && (Tk_Screen(tkwin) == borderPtr->screen) - && (Tk_Colormap(tkwin) == borderPtr->colormap)) { - /* - * The object already points to the right border structure. Just - * return it. - */ - - return (Tk_3DBorder) borderPtr; - } - - /* - * If we make it here, it means we aren't so lucky. Either there was no - * cached TkBorder in the Tcl_Obj, or the TkBorder that was there is for - * the wrong screen/colormap. Either way, we have to search for the right - * TkBorder. For each color name, there is linked list of TkBorder - * structures, one structure for each screen/colormap combination. The - * head of the linked list is recorded in a hash table (where the key is - * the color name) attached to the TkDisplay structure. Walk this list to - * find the right TkBorder structure. - */ - - hashPtr = Tcl_FindHashEntry(&dispPtr->borderTable, Tcl_GetString(objPtr)); - if (hashPtr == NULL) { - goto error; - } - for (borderPtr = Tcl_GetHashValue(hashPtr); borderPtr != NULL; - borderPtr = borderPtr->nextPtr) { - if ((Tk_Screen(tkwin) == borderPtr->screen) - && (Tk_Colormap(tkwin) == borderPtr->colormap)) { - FreeBorderObj(objPtr); - objPtr->internalRep.twoPtrValue.ptr1 = borderPtr; - borderPtr->objRefCount++; - return (Tk_3DBorder) borderPtr; - } - } - - error: - Tcl_Panic("Tk_Get3DBorderFromObj called with non-existent border!"); - /* - * The following code isn't reached; it's just there to please compilers. - */ - return NULL; -} - -/* - *---------------------------------------------------------------------- - * - * InitBorderObj -- - * - * Attempt to generate a border internal form for the Tcl object - * "objPtr". - * - * Results: - * The return value is a standard Tcl result. If an error occurs during - * conversion, an error message is left in the interpreter's result - * unless "interp" is NULL. - * - * Side effects: - * If no error occurs, a blank internal format for a border value is - * intialized. The final form cannot be done without a Tk_Window. - * - *---------------------------------------------------------------------- - */ - -static void -InitBorderObj( - Tcl_Obj *objPtr) /* The object to convert. */ -{ - const Tcl_ObjType *typePtr; - - /* - * Free the old internalRep before setting the new one. - */ - - Tcl_GetString(objPtr); - typePtr = objPtr->typePtr; - if ((typePtr != NULL) && (typePtr->freeIntRepProc != NULL)) { - typePtr->freeIntRepProc(objPtr); - } - objPtr->typePtr = &tkBorderObjType; - objPtr->internalRep.twoPtrValue.ptr1 = NULL; -} - -/* - *---------------------------------------------------------------------- - * - * TkDebugBorder -- - * - * This function returns debugging information about a border. - * - * Results: - * The return value is a list with one sublist for each TkBorder - * corresponding to "name". Each sublist has two elements that contain - * the resourceRefCount and objRefCount fields from the TkBorder - * structure. - * - * Side effects: - * None. - * - *---------------------------------------------------------------------- - */ - -Tcl_Obj * -TkDebugBorder( - Tk_Window tkwin, /* The window in which the border will be used - * (not currently used). */ - const char *name) /* Name of the desired color. */ -{ - Tcl_HashEntry *hashPtr; - Tcl_Obj *resultPtr; - TkDisplay *dispPtr = ((TkWindow *) tkwin)->dispPtr; - - resultPtr = Tcl_NewObj(); - hashPtr = Tcl_FindHashEntry(&dispPtr->borderTable, name); - if (hashPtr != NULL) { - TkBorder *borderPtr = Tcl_GetHashValue(hashPtr); - - if (borderPtr == NULL) { - Tcl_Panic("TkDebugBorder found empty hash table entry"); - } - for ( ; (borderPtr != NULL); borderPtr = borderPtr->nextPtr) { - Tcl_Obj *objPtr = Tcl_NewObj(); - - Tcl_ListObjAppendElement(NULL, objPtr, - Tcl_NewIntObj(borderPtr->resourceRefCount)); - Tcl_ListObjAppendElement(NULL, objPtr, - Tcl_NewIntObj(borderPtr->objRefCount)); - Tcl_ListObjAppendElement(NULL, resultPtr, objPtr); - } - } - return resultPtr; -} - -/* - * Local Variables: - * mode: c - * c-basic-offset: 4 - * fill-column: 78 - * End: - */ |