Equation about isometric polygon curve is set up with differential geometry theory. The curve is proved to be convex curve which the distance between any parallel tangent lines is equal.
应用微分几何理论，导出了等距曲线的方程，证明了它是具有任意两条平行切线之间距离都相等的卵形线。
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.
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。
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