如果外接椭圆的宽度或高度是0，则不绘制椭圆。

If either the width or the height of the bounding rectangle is 0, no ellipse is drawn.

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本实用新型可根据所需绘制椭圆的长、短轴的长度直接在图纸上一次绘成。

The utility model can directly draw an ellipse for once on paper according to the lengths of the long shaft and the short shaft of the ellipse which is required.

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清单3显示了如何绘制线、矩形、圆(使用椭圆)及椭圆。

Listing 3 shows how to draw lines, rectangles, circles (using the ellipse), and ellipses.

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