The graphics engine maintains the coordinates of geometric shapes in a path in world coordinate space.

图形引擎在世界坐标空间中维护路径内的几何形状的坐标.

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Before we can start drawing , we need to talk about the canvas grid or coordinate space.

在真正开始之前, 我们需要先探讨canvas的网格(grid)或者坐标空间(coordinatespace).

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