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)

void
Tk_Draw3DRectangle(tkwin, drawable, border, x, y, width, height, borderWidth, relief)

void
Tk_Fill3DRectangle(tkwin, drawable, border, x, y, width, height, borderWidth, relief)

void
Tk_Draw3DPolygon(tkwin, drawable, border, pointPtr, numPoints, polyBorderWidth, leftRelief)

void
Tk_Fill3DPolygon(tkwin, drawable, border, pointPtr, numPoints, polyBorderWidth, leftRelief)

void
Tk_3DVerticalBevel(tkwin, drawable, border, x, y, width, height, leftBevel, relief)

void
Tk_3DHorizontalBevel(tkwin, drawable, border, x, y, width, height, leftIn, rightIn, topBevel, relief)

void
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
Interpreter to use for error reporting. Token for window (for all procedures except Tk_Get3DBorder, must be the window for which the border was allocated). Pointer to object whose value describes color corresponding to background (flat areas). Illuminated edges will be brighter than this and shadowed edges will be darker than this. Same as objPtr except value is supplied as a string rather than an object. X token for window or pixmap; indicates 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. Token for border previously allocated in call to Tk_Get3DBorder. X-coordinate of upper-left corner of rectangle describing border or bevel, in pixels. Y-coordinate of upper-left corner of rectangle describing border or bevel, in pixels. Width of rectangle describing border or bevel, in pixels. Height of rectangle describing border or bevel, in pixels. Width of border in pixels. Positive means border is inside rectangle given by x, y, width, height, negative means border is outside rectangle. Indicates 3-D position of interior of object 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_RELIEF_FLAT for Tk_Fill3DRectangle). 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 isn't). Number of points at *pointPtr. Width of border in pixels. If positive, border is drawn to left of trajectory given by pointPtr; if negative, border is drawn to right of trajectory. If leftRelief is TK_RELIEF_GROOVE or TK_RELIEF_RIDGE then the border is centered on the trajectory. 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_RELIEF_GROOVE and TK_RELIEF_RIDGE mean the obvious things. For Tk_Fill3DPolygon, TK_RELIEF_FLAT may also be specified to indicate no difference in height. Non-zero means this bevel forms the left side of the object; zero means it forms the right side. Non-zero means that the left edge of the horizontal bevel angles in, so that the bottom of the edge is farther to the right than the top. Zero means the edge angles out, so that the bottom is farther to the left than the top. Non-zero means that the right edge of the horizontal bevel angles in, so that the bottom of the edge is farther to the left than the top. Zero means the edge angles out, so that the bottom is farther to the right than the top. Non-zero means this bevel forms the top side of the object; zero means it forms the bottom side. 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 allocates 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 actually be used in the border; it indicates the background color for the window (i.e. a color for flat surfaces). The illuminated portions of the border will appear brighter than indicated by objPtr, and the shadowed portions 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 error message is left in interp->result. 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 an object. This prevents Tk_Get3DBorder from caching the return value, so Tk_Get3DBorder is less efficient 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 doesn't 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_Get3DBorderFromObj 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 occupied by the border. The relief argument indicates which of several three-dimensional effects is desired: TK_RELIEF_RAISED means that the interior of the rectangle should appear raised relative to the exterior of the rectangle, and TK_RELIEF_SUNKEN means that the interior should appear depressed. TK_RELIEF_GROOVE and TK_RELIEF_RIDGE mean that there should appear 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 define 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 produce a three-dimensional appearance. If the trajectory is non-self-intersecting, the appearance will be a raised or sunken polygon shape. The trajectory 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_Draw3DRectangle. 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_3DHorizontalBevel draws a horizontal beveled edge, such as the top or bottom of a rectangle. Each procedure takes x, y, width, and height arguments that describe the rectangular area of the beveled edge (e.g., width is the border width for Tk_3DVerticalBevel). The leftBorder and topBorder arguments indicate the position of the border relative to the ``inside'' of the object, and relief indicates the relief of the inside of the object relative to the outside. Tk_3DVerticalBevel just draws a rectangular region. Tk_3DHorizontalBevel 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 arguments 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 returns the context for dark shadows.

When a border is no longer needed, Tk_Free3DBorderFromObj or Tk_Free3DBorder 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, object, polygon, raised, shadow, three-dimensional effect