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1.掌握矩形和椭圆的绘制方法

2.掌握正多边形和文字的绘制方法

3.掌握曲线过渡的绘制方法

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• 呆扳手由三部分组成，左边是基本图素，中间部分可以通过作平行线和圆弧过渡生成，难点在于右端形状的绘制。本着先定位后定形的原则，在画出R20的圆和正六边形后，再过正六边形的一个顶点和圆的切点画两段R10的圆弧。

1．两点矩形：给定矩形的对角线上两点绘制矩形。

2．中心-长-宽：给定长度和宽度值来绘制矩形。

1．长半轴：椭圆的长半轴尺寸值。

2．短半轴：椭圆的短半轴尺寸值。

3．旋转角：椭圆的长轴与默认起始基准（X轴正方向）间的夹角。

4．起始角：画椭圆弧时起始位置与默认起始基准所夹的角度。

5．终止角：画椭圆弧时终止位置与默认起始基准所夹的角度。

1．圆弧过渡

2．倒角

3．尖角