A subclass of Shader that draws a sweep gradient around a center point.
Parameters
cx
| The x-coordinate of the center |
cy
| The y-coordinate of the center |
colors
| The colors to be distributed between around the center.
There must be at least 2 colors in the array. |
positions
| May be NULL. The relative position of
each corresponding color in the colors array, beginning
with 0 and ending with 1.0. If the values are not
monotonic, the drawing may produce unexpected results.
If positions is NULL, then the colors are automatically
spaced evenly.
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