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Tk_Alloc3DBorderFromObj(3) Tk Library Procedures Tk_Alloc3DBorderFromObj(3) ________________________________________________________________________________ NAME Tk_Alloc3DBorderFromObj, Tk_Get3DBorder, Tk_Get3DBorderFromObj, Tk_Draw3DRectangle, Tk_Fill3DRectangle, Tk_Draw3DPolygon, Tk_Fill3DPolygon, Tk_3DVerticalBevel, Tk_3DHorizontalBevel, Tk_SetBackgroundFromBorder, Tk_NameOf3DBorder, Tk_3DBorderColor, Tk_3DBorderGC, Tk_Free3DBorderFromObj, Tk_Free3DBorder - draw borders with three-dimensional appearance SYNOPSIS #include <tk.h> Tk_3DBorder Tk_Alloc3DBorderFromObj(interp, tkwin, objPtr) Tk_3DBorder Tk_Get3DBorder(interp, tkwin, colorName) Tk_3DBorder Tk_Get3DBorderFromObj(tkwin, objPtr) Tk_Draw3DRectangle(tkwin, drawable, border, x, y, width, height, borderWidth, relief) Tk_Fill3DRectangle(tkwin, drawable, border, x, y, width, height, borderWidth, relief) Tk_Draw3DPolygon(tkwin, drawable, border, pointPtr, numPoints, polyBorderWidth, leftRelief) Tk_Fill3DPolygon(tkwin, drawable, border, pointPtr, numPoints, polyBorderWidth, leftRelief) Tk_3DVerticalBevel(tkwin, drawable, border, x, y, width, height, leftBevel, relief) Tk_3DHorizontalBevel(tkwin, drawable, border, x, y, width, height, leftIn, rightIn, topBevel, relief) Tk_SetBackgroundFromBorder(tkwin, border) const char * Tk_NameOf3DBorder(border) XColor * Tk_3DBorderColor(border) GC * Tk_3DBorderGC(tkwin, border, which) Tk_Free3DBorderFromObj(tkwin, objPtr) Tk_Free3DBorder(border) ARGUMENTS Tcl_Interp *interp (in) Interpreter to use for error report- ing. Tk_Window tkwin (in) Token for window (for all procedures except Tk_Get3DBorder, must be the window for which the border was allo- cated). Tcl_Obj *objPtr (in) Pointer to value whose value de- scribes color corresponding to back- ground (flat areas). Illuminated edges will be brighter than this and shadowed edges will be darker than this. const char *colorName (in) Same as objPtr except value is sup- plied as a string rather than a value. Drawable drawable (in) X token for window or pixmap; indi- cates where graphics are to be drawn. Must either be the X window for tkwin or a pixmap with the same screen and depth as tkwin. Tk_3DBorder border (in) Token for border previously allocated in call to Tk_Get3DBorder. int x (in) X-coordinate of upper-left corner of rectangle describing border or bevel, in pixels. int y (in) Y-coordinate of upper-left corner of rectangle describing border or bevel, in pixels. int width (in) Width of rectangle describing border or bevel, in pixels. int height (in) Height of rectangle describing border or bevel, in pixels. int borderWidth (in) Width of border in pixels. Positive means border is inside rectangle given by x, y, width, height, nega- tive means border is outside rectan- gle. int relief (in) Indicates 3-D position of interior of value relative to exterior; should be TK_RELIEF_RAISED, TK_RELIEF_SUNKEN, TK_RELIEF_GROOVE, TK_RELIEF_SOLID, or TK_RELIEF_RIDGE (may also be TK_RE- LIEF_FLAT for Tk_Fill3DRectangle). XPoint *pointPtr (in) Pointer to array of points describing the set of vertices in a polygon. The polygon need not be closed (it will be closed automatically if it is not). int numPoints (in) Number of points at *pointPtr. int polyBorderWidth (in) Width of border in pixels. If posi- tive, border is drawn to left of tra- jectory given by pointPtr; if nega- tive, border is drawn to right of trajectory. If leftRelief is TK_RE- LIEF_GROOVE or TK_RELIEF_RIDGE then the border is centered on the trajec- tory. int leftRelief (in) Height of left side of polygon's path relative to right. TK_RELIEF_RAISED means left side should appear higher and TK_RELIEF_SUNKEN means right side should appear higher; TK_RE- LIEF_GROOVE and TK_RELIEF_RIDGE mean the obvious things. For Tk_Fill3DPolygon, TK_RELIEF_FLAT may also be specified to indicate no dif- ference in height. int leftBevel (in) Non-zero means this bevel forms the left side of the value; zero means it forms the right side. int leftIn (in) Non-zero means that the left edge of the horizontal bevel angles in, so that the bottom of the edge is far- ther to the right than the top. Zero means the edge angles out, so that the bottom is farther to the left than the top. int rightIn (in) Non-zero means that the right edge of the horizontal bevel angles in, so that the bottom of the edge is far- ther to the left than the top. Zero means the edge angles out, so that the bottom is farther to the right than the top. int topBevel (in) Non-zero means this bevel forms the top side of the value; zero means it forms the bottom side. int which (in) Specifies which of the border's graphics contexts is desired. Must be TK_3D_FLAT_GC, TK_3D_LIGHT_GC, or TK_3D_DARK_GC. ________________________________________________________________________________ DESCRIPTION These procedures provide facilities for drawing window borders in a way that produces a three-dimensional appearance. Tk_Alloc3DBorderFromObj al- locates colors and Pixmaps needed to draw a border in the window given by the tkwin argument. The value of objPtr is a standard Tk color name that determines the border colors. The color indicated by objPtr will not actu- ally be used in the border; it indicates the background color for the win- dow (i.e. a color for flat surfaces). The illuminated portions of the bor- der will appear brighter than indicated by objPtr, and the shadowed por- tions of the border will appear darker than objPtr. Tk_Alloc3DBorderFromObj returns a token that may be used in later calls to Tk_Draw3DRectangle. If an error occurs in allocating information for the border (e.g. a bogus color name was given) then NULL is returned and an er- ror message is left as the result of interpreter interp. If it returns successfully, Tk_Alloc3DBorderFromObj caches information about the return value in objPtr, which speeds up future calls to Tk_Alloc3DBorderFromObj with the same objPtr and tkwin. Tk_Get3DBorder is identical to Tk_Alloc3DBorderFromObj except that the color is specified with a string instead of a value. This prevents Tk_Get3DBorder from caching the return value, so Tk_Get3DBorder is less ef- ficient than Tk_Alloc3DBorderFromObj. Tk_Get3DBorderFromObj returns the token for an existing border, given the window and color name used to create the border. Tk_Get3DBorderFromObj does not actually create the border; it must already have been created with a previous call to Tk_Alloc3DBorderFromObj or Tk_Get3DBorder. The return value is cached in objPtr, which speeds up future calls to Tk_Get3DBorder- FromObj with the same objPtr and tkwin. Once a border structure has been created, Tk_Draw3DRectangle may be invoked to draw the border. The tkwin argument specifies the window for which the border was allocated, and drawable specifies a window or pixmap in which the border is to be drawn. Drawable need not refer to the same window as tkwin, but it must refer to a compatible pixmap or window: one associated with the same screen and with the same depth as tkwin. The x, y, width, and height arguments define the bounding box of the border region within drawable (usually x and y are zero and width and height are the dimensions of the window), and borderWidth specifies the number of pixels actually oc- cupied by the border. The relief argument indicates which of several three-dimensional effects is desired: TK_RELIEF_RAISED means that the inte- rior of the rectangle should appear raised relative to the exterior of the rectangle, and TK_RELIEF_SUNKEN means that the interior should appear de- pressed. TK_RELIEF_GROOVE and TK_RELIEF_RIDGE mean that there should ap- pear to be a groove or ridge around the exterior of the rectangle. Tk_Fill3DRectangle is somewhat like Tk_Draw3DRectangle except that it first fills the rectangular area with the background color (one corresponding to the color used to create border). Then it calls Tk_Draw3DRectangle to draw a border just inside the outer edge of the rectangular area. The argument relief indicates the desired effect (TK_RELIEF_FLAT means no border should be drawn; all that happens is to fill the rectangle with the background color). The procedure Tk_Draw3DPolygon may be used to draw more complex shapes with a three-dimensional appearance. The pointPtr and numPoints arguments de- fine a trajectory, polyBorderWidth indicates how wide the border should be (and on which side of the trajectory to draw it), and leftRelief indicates which side of the trajectory should appear raised. Tk_Draw3DPolygon draws a border around the given trajectory using the colors from border to pro- duce a three-dimensional appearance. If the trajectory is non-self-inter- secting, the appearance will be a raised or sunken polygon shape. The tra- jectory may be self-intersecting, although it's not clear how useful this is. Tk_Fill3DPolygon is to Tk_Draw3DPolygon what Tk_Fill3DRectangle is to Tk_Draw3DRectangle: it fills the polygonal area with the background color from border, then calls Tk_Draw3DPolygon to draw a border around the area (unless leftRelief is TK_RELIEF_FLAT; in this case no border is drawn). The procedures Tk_3DVerticalBevel and Tk_3DHorizontalBevel provide lower- level drawing primitives that are used by procedures such as Tk_Draw3DRec- tangle. These procedures are also useful in their own right for drawing rectilinear border shapes. Tk_3DVerticalBevel draws a vertical beveled edge, such as the left or right side of a rectangle, and Tk_3DHorizontal- Bevel draws a horizontal beveled edge, such as the top or bottom of a rec- tangle. Each procedure takes x, y, width, and height arguments that de- scribe the rectangular area of the beveled edge (e.g., width is the border width for Tk_3DVerticalBevel). The leftBorder and topBorder arguments in- dicate the position of the border relative to the "inside" of the value, and relief indicates the relief of the inside of the value relative to the outside. Tk_3DVerticalBevel just draws a rectangular region. Tk_3DHori- zontalBevel draws a trapezoidal region to generate mitered corners; it should be called after Tk_3DVerticalBevel (otherwise Tk_3DVerticalBevel will overwrite the mitering in the corner). The leftIn and rightIn argu- ments to Tk_3DHorizontalBevel describe the mitering at the corners; a value of 1 means that the bottom edge of the trapezoid will be shorter than the top, 0 means it will be longer. For example, to draw a rectangular border the top bevel should be drawn with 1 for both leftIn and rightIn, and the bottom bevel should be drawn with 0 for both arguments. The procedure Tk_SetBackgroundFromBorder will modify the background pixel and/or pixmap of tkwin to produce a result compatible with border. For color displays, the resulting background will just be the color specified when border was created; for monochrome displays, the resulting background will be a light stipple pattern, in order to distinguish the background from the illuminated portion of the border. Given a token for a border, the procedure Tk_NameOf3DBorder will return the color name that was used to create the border. The procedure Tk_3DBorderColor returns the XColor structure that will be used for flat surfaces drawn for its border argument by procedures like Tk_Fill3DRectangle. The return value corresponds to the color name that was used to create the border. The XColor, and its associated pixel value, will remain allocated as long as border exists. The procedure Tk_3DBorderGC returns one of the X graphics contexts that are used to draw the border. The argument which selects which one of the three possible GC's: TK_3D_FLAT_GC returns the context used for flat surfaces, TK_3D_LIGHT_GC returns the context for light shadows, and TK_3D_DARK_GC re- turns the context for dark shadows. When a border is no longer needed, Tk_Free3DBorderFromObj or Tk_Free3DBor- der should be called to release the resources associated with it. For Tk_Free3DBorderFromObj the border to release is specified with the window and color name used to create the border; for Tk_Free3DBorder the border to release is specified with the Tk_3DBorder token for the border. There should be exactly one call to Tk_Free3DBorderFromObj or Tk_Free3DBorder for each call to Tk_Alloc3DBorderFromObj or Tk_Get3DBorder. KEYWORDS 3D, background, border, color, depressed, illumination, value, polygon, raised, shadow, three-dimensional effect Tk 8.1 Tk_Alloc3DBorderFromObj(3)
NAME | SYNOPSIS | ARGUMENTS | DESCRIPTION | KEYWORDS
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