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Help me with drawing a perfect arc

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I use GL_LINE_STRIP to draw an arc. http://www.zaitian.com/UploadFile/20041131151142631.gif But when line width is greater than 1.0, the curve becomes so ugly. The curve has some injurys and not smooth. How can I overcome this? The ugly curve: http://www.zaitian.com/UploadFile/20041131151142631.gif In the gif, horizontal line and vertical line is so perfect, but oblique lines and the arc look ugly.

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