精灵的轴心点，相对于其边界矩形。
轴心点通常以 (0-1) 范围内的 (x, y) 值指定。例如：矩形左上角为 (0,0)；矩形右下角为 (1,1)，而矩形中心为 (0.5,0.5)。
轴心点也可以位于边界矩形之外。使用 (0-1) 范围之外的值可实现这一点。例如：位于中心但远高于边界矩形的位置为 (0.5,-2)。与边界矩形的底部成一直线但在矩形边界最右侧的位置为 (3,1)。
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