绘画透视学的原理及其应用（续一）陆仰豪六、曲线透视图的画法及其应用曲线可分为平面曲线与立体曲线。平面曲线限制在一个平面内曲，立体曲线在一个体积范围内曲。在这两种曲线中，各自可分为有规则的曲线和无规则的任意曲线。根据应用上的需要，这里只讲平面曲线中的圆... Painting perspective theory and its application (continued) Lu Yanghao VI, the curve perspective drawing method and its application curve can be divided into plane curve and three-dimensional curve. The plane curve is limited to a plane curve, the curve curve in a volume range. In these two kinds of curves, each can be divided into a regular curve and an arbitrary random curve. According to the needs of the application, here only talk about the plane curve of the circle ...