1.Achieved a shift point, draw line, draw arc, draw a circle, draw a rectangle and the combination of graphics rendering.
实现了移点、画线、画弧、画圆、画矩形和组合图形的绘制。
2.Objects to draw line segments, curves, and the outlines of shapes.
对象绘制线段、曲线和形状的轮廓线。
3.Analyze the Essentiality of The Exigency Stop in the Draw Line
急停在牵伸线安全生产中的重要性分析