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	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;

SEE ALSO¶

XkbComputeRowBounds(3)