Clear a rectangular area back to transparent black.
The clip region may limit the area cleared. The current path
is not affected by this clearing. The current transform at the
time that this is called will affect the given point and
rectangle. The width and/or the height may be negative or
zero. If either is zero, or the current transform is not
invertible, this does nothing.
Clear a rectangular area back to transparent black.
The clip region may limit the area cleared. The current path is not affected by this clearing. The current transform at the time that this is called will affect the given point and rectangle. The width and/or the height may be negative or zero. If either is zero, or the current transform is not invertible, this does nothing.