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Calculate the bounding box for a control surface
PhRect_t *PtSurfaceCalcBoundingBox(
PtSurface_t *surface );
PhRect_t *PtSurfaceCalcBoundingBoxById(
PtWidget_t *widget,
unsigned char surface_id );
ph
These functions calculate the bounding box for a control surface.
They differ in the way they identify the control surface:
- PtSurfaceCalcBoundingBox()
- Uses the surface argument, which points to a
PtSurface_t structure that describes the control surface.
This pointer must not be NULL.
- PtSurfaceCalcBoundingBoxById()
- Searches the control surfaces belonging to the given widget for the one
with an ID of surface_id.
You should call one of these functions whenever you modify the points defining
a surface.
Although these functions are mainly targeted as a convenience function for
polygonal surfaces, they also ensure that the upper-left/lower-right
corners of a rectangular or elliptical surface never get inverted.
A pointer to a
PhRect_t
structure that defines
the bounding rectangle of the surface.
PtSurfaceCalcBoundingBoxById() returns NULL if
it couldn't find the control surface with the given ID.
Photon
Safety: | |
Interrupt handler |
No |
Signal handler |
No |
Thread |
No |
PhRect_t,
PtCalcSurface(),
PtCalcSurfaceByAction(),
PtCalcSurfaceById(),
PtSurfaceExtent(),
PtSurfaceExtentById(),
PtSurfaceRect(),
PtSurfaceRectById()
Control Surfaces
chapter of the Photon Programmer's Guide
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