Creates a multi-point radial gradient color.
The color stops are defined as an array of offsets and colors in the following format:
offset0, color0, offset1, color1, .... offsetN, colorN
The first offset (offset0) should be 0, which represents the center of the gradient defining ellipse. The last offset (offsetN) can be any number not greater than 100000. It represents the perimeter of the gradient defining ellipse. The other offsets represent the positions of the color stops in between.
For example, the array (in hex):
000000, FF0000, 000080, FFFF00, 000100, 00FF00
means the center (000000) is red (FF0000), the mid-point (000080 in hex) is yellow (FFFF00), and the perimeter (000100 in hex) is green (00FF00).
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