XkbComputeShapeBounds
XkbComputeShapeBounds
NAMESYNOPSIS
ARGUMENTS
DESCRIPTION
STRUCTURES
SEE ALSO
NAME
XkbComputeShapeBounds − Updates the bounding box of a shape
SYNOPSIS
|
Bool XkbComputeShapeBounds |
(XkbShapePtr shape); |
ARGUMENTS
− shape
shape to be examined
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.
STRUCTURES
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 /td> |
x1,y1; |
/∗ upper left corner of the bounds, in mm/10 */
| ||||
|
x2,y2; |
/∗ lower right corner of the bounds, in mm/10 */ |
} XkbBoundsRec, *XkbBoundsPtr;
SEE ALSO
XkbComputeRowBounds(3)
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