Next, the center of the pie is erased by drawing a white circle, and another arc is drawn to provide a visual border between the interior circle and the peripheral pie slices.
接下来，将绘制一个白色圆形擦掉饼图的中心，并且绘制另一条弧线来提供内部圆形与外围饼图分区之间的可视边界。
To see the illusion, look at the center of the circle and notice the peripheral shimmering.
想看到这个幻视，盯住圆心，注意边缘的闪烁。
The center panel is centered about a longitudinal axis (50) and has a peripheral edge.
中心面板环绕纵向轴线(50)定位并具有周边边缘。
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