/* * tk3d.c -- * * This module provides procedures to draw borders in the * three-dimensional Motif style. * * Copyright © 1990-1994 The Regents of the University of California. * Copyright © 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. */ const char *const tkReliefStrings[] = { "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 TkObjType tkBorderObjType = { {"border", /* name */ FreeBorderObjProc, /* freeIntRepProc */ DupBorderObjProc, /* dupIntRepProc */ NULL, /* updateStringProc */ NULL, /* setFromAnyProc */ TCL_OBJTYPE_V0}, 0 }; /* *---------------------------------------------------------------------- * * 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.objType) { InitBorderObj(objPtr); } borderPtr = (TkBorder *)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 = (TkBorder *)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 = (TkBorder *)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 = NULL; borderPtr->darkGC = NULL; borderPtr->lightGC = NULL; 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 == NULL) && (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 NULL; } /* *-------------------------------------------------------------- * * 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; if (borderPtr->resourceRefCount-- > 1) { return; } prevPtr = (TkBorder *)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 != NULL) { Tk_FreeGC(display, borderPtr->bgGC); } if (borderPtr->darkGC != NULL) { Tk_FreeGC(display, borderPtr->darkGC); } if (borderPtr->lightGC != NULL) { 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 = (TkBorder *)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 = (TkBorder *)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. */ { 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, tkReliefStrings, 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_* * * 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; int relief; c = name[0]; length = strlen(name); if ((c == 'f') && (strncmp(name, "flat", length) == 0)) { relief = TK_RELIEF_FLAT; } else if ((c == 'g') && (strncmp(name, "groove", length) == 0)) { relief = TK_RELIEF_GROOVE; } else if ((c == 'r') && (strncmp(name, "raised", length) == 0) && (length >= 2)) { relief = TK_RELIEF_RAISED; } else if ((c == 'r') && (strncmp(name, "ridge", length) == 0) && (length >= 2)) { relief = TK_RELIEF_RIDGE; } else if ((c == 's') && (strncmp(name, "solid", length) == 0) && (length >= 2)) { relief = TK_RELIEF_SOLID; } else if ((c == 's') && (strncmp(name, "sunken", length) == 0) && (length >= 2)) { relief = TK_RELIEF_SUNKEN; } else { if (interp) { 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; } if (reliefPtr) { *reliefPtr = relief; } 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). */ Tcl_Size 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. */ XPoint *p1Ptr, *p2Ptr; TkBorder *borderPtr = (TkBorder *) border; GC gc; Tcl_Size i; int lightOnLeft, dx, dy, parallel, pointsSeen; Display *display = Tk_Display(tkwin); if (borderPtr->lightGC == NULL) { 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 = 0, p1Ptr = &pointPtr[numPoints-2], p2Ptr = p1Ptr+1; i < numPoints + 2; 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. */ { 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). */ Tcl_Size 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. */ { TkBorder *borderPtr = (TkBorder *) border; XFillPolygon(Tk_Display(tkwin), drawable, borderPtr->bgGC, pointPtr, (int)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.objType) { 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 = (TkBorder *)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 = (TkBorder *)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 * initialized. 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.objType; 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 = (TkBorder *)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_NewWideIntObj((Tcl_WideInt)borderPtr->resourceRefCount)); Tcl_ListObjAppendElement(NULL, objPtr, Tcl_NewWideIntObj((Tcl_WideInt)borderPtr->objRefCount)); Tcl_ListObjAppendElement(NULL, resultPtr, objPtr); } } return resultPtr; } /* *-------------------------------------------------------------- * * Tk_Get3BorderColors -- * * Given a Tk_3DBorder determine its 3 colors. * * Results: * None. * * Side effects: * None. * *-------------------------------------------------------------- */ void Tk_Get3DBorderColors( Tk_3DBorder border, XColor *bgColorPtr, XColor *darkColorPtr, XColor *lightColorPtr) { if (bgColorPtr) { *bgColorPtr = *((TkBorder *)border)->bgColorPtr; } if (darkColorPtr) { *darkColorPtr = *((TkBorder *) border)->darkColorPtr; } if (lightColorPtr) { *lightColorPtr = *((TkBorder *) border)->lightColorPtr; } } /* * Local Variables: * mode: c * c-basic-offset: 4 * fill-column: 78 * End: */