This paper presents a new method of drawing perspective shade and shadow in parallel rays, which makes use of plane trace and geometricaldrawing method.
探讨了一种利用平面迹线和几何作图法，作无灭光线下透视阴影的新方法。
2
You cannot optimize pictures that have a drawing type of format vector graphics vector graphics: The representation of graphic objects such as lines, arcs, and squares by using geometrical formulas.
不能优化具有绘图类型格式矢量图形向量图形：使用几何公式的图形对象的表示形式，如线条、弧形和正方形。
3
He was drawing in this circle geometrical lines, and seemed as much absorbed in his problem as Archimedes was when the soldier of Marcellus slew him.