1. NAME

XkbComputeShapeBounds - Updates the bounding box of a shape

2. SYNOPSIS

Bool XkbComputeShapeBounds (XkbShapePtr shape );

3. ARGUMENTS

  • - shape
        shape to be examined

4. DESCRIPTION

Xkb provides a number of convenience functions to help use a keyboard geometry. These include functions to return the bounding box of a shape's top surface and to update the bounding box of a shape row or section. A shape is made up of a number of outlines. Each outline is a polygon made up of a number of points. The bounding box of a shape is a rectangle that contains all the outlines of that shape. A ShapeRec contains a BoundsRec that describes the bounds of the shape. If you add or delete an outline to or from a shape, the bounding box must be updated. XkbComputeShapeBounds updates the BoundsRec contained in the shape by examining all the outlines of the shape and setting the BoundsRec to the minimum x and minimum y, and maximum x and maximum y values found in those outlines. XkbComputeShapeBounds returns False if shape is NULL or if there are no outlines for the shape; otherwise, it returns True. If you add or delete a key to or from a row, or if you update the shape of one of the keys in that row, you may need to update the bounding box of that row. To update the bounding box of a row, use XkbComputeRowBounds.

5. STRUCTURES

 
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typedef struct _XkbShape {
    Atom           name;         /(** shape's name */
    unsigned short num_outlines; /(** number of outlines for the shape */
    unsigned short sz_outlines;  /(** size of the outlines array */
    XkbOutlinePtr  outlines;     /(** array of outlines for the shape */
    XkbOutlinePtr  approx;       /(** pointer into the array to the approximating outline */
    XkbOutlinePtr  primary;      /(** pointer into the array to the primary outline */
    XkbBoundsRec   bounds;       /(** bounding box for the shape; encompasses all outlines */
} XkbShapeRec, *XkbShapePtr;
typedef struct _XkbBounds {
    short	x1,y1;	/(** upper left corner of the bounds, in mm/10 */
    short	x2,y2;	/(** lower right corner of the bounds, in mm/10 */
} XkbBoundsRec, *XkbBoundsPtr;

6. SEE ALSO

R XkbComputeRowBounds (3)