XkbComputeShapeBounds − Updates the bounding box of a shape
Bool XkbComputeShapeBounds |
(XkbShapePtr shape); |
shape |
shape to be examined |
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.
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 {
x1,y1; |
/* upper left corner of the bounds, in mm/10 */ | |||||
x2,y2; |
/* lower right corner of the bounds, in mm/10 */ |
} XkbBoundsRec, *XkbBoundsPtr;
XkbComputeRowBounds(3)