当水平座标从0移到200时，椭圆形和矩形也会从红色逐渐变成蓝色。
The ellipse and the rectangle also change gradually from red to blue as the horizontal coordinate goes from 0 to 200.
绘制弧形，表示由一对座标、宽度和高度所指定的椭圆形的一部分。
Draws an arc representing a portion of an ellipse specified by a pair of coordinates, a width, and a height.
绘制由椭圆形所定义的派形，该椭圆形是由座标对、宽度、高度和两条放射线所指定。
Draws a pie shape defined by an ellipse specified by a coordinate pair, a width, a height, and two radial lines.
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