用一个正方形格子来表示建筑物，将前景与背景画在统一的平面上，依照格子的平行线排好。
By representing a building on an isometric grid, the drawing can present details in the foreground and background on a uniform plane, aligned to the parallel lines of the grid.
如果目标区域与源区域不相交，则使用当前前景色和背景色将源区域填充为空白。
If the destination area does not intersect the source area, the source area is filled with blanks using the current foreground and background colors.
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