这意味着，它不是一个圆形坐标系统。
给定一组坐标和结束帧，circleSetPixels 将画出一系列重叠圆形。
For a given set of coordinates and an ending frame, the circleSetPixels function will draw a series of overlapping circles.
类似于标绘上面的世界地图，后续命令将在州渐变地图中标绘大型蓝色椭圆形，同时在图像中记录各自的像素坐标。
Similar to the plotting of the world map above, the succeeding command plots large blue ellipses on the state shaded map, while recording the respective pixel coordinates in the image.
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