强制画布中的元素按像素对齐。仅在 renderMode 为屏幕空间时适用。
启用 pixelPerfect 可使元素看起来更清晰,避免出现模糊。但是,如果许多元素被缩放或旋转过,或者使用了微妙的动画位置或缩放,则禁用 pixelPerfect 可能比较好,这样可使移动更为平滑。
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