... Basic Structure of Objects_物体的基础结构 Drawing Straight Lines_画直线 Drawing Lines Freehand_随手画线 ...
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You use it for drawing straight lines.
你用它来画直线。
VC NET development of CAD source, including drawing straight lines, arcs, and polygons, graphics printing.
用VC NET实现的CAD开发源程序， 包括画直线，圆弧，多边形，图形打印等。
A vector drawing is like a pencil drawing where you take a pencil from one point to another and connect the points with straight lines, curved lines, rectangles, and ellipses.
矢量作图更像是用铅笔画画，先拿铅笔确定一些点，然后用直线、曲线、方框和椭圆框连接这些点。
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