Fills the interior of an ellipse defined by a bounding rectangle specified by a pair of coordinates, a width, and a height.
填充边框所定义的椭圆的内部，该边框由一对坐标、一个宽度和一个高度指定。
An ellipse is defined by its bounding rectangle; an arc is a portion of an ellipse defined by a starting Angle and a sweep Angle.
椭圆是由其边框定义的；弧是椭圆的一部分，由一个起始角和一个扫描角定义。
If not every point within the bounding rectangle is clickable, and you perform specialized hit testing, then override and provide a clickable point.
如果无法点选周框内的每个点，而且您执行的是特殊的点击测试，则请覆写并提供可按的点。
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