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	<title>Program &#38; Design &#187; opengl</title>
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		<title>Draw an Unfilled Circle</title>
		<link>http://programanddesign.com/cpp/draw-an-unfilled-circle/</link>
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		<pubDate>Wed, 15 Apr 2009 02:38:00 +0000</pubDate>
		<dc:creator>Mark</dc:creator>
				<category><![CDATA[C++]]></category>
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		<description><![CDATA[OpenGL doesn't seem to have any functions for drawing an unfilled circle, so you can use this code instead. It uses lines, so you can adjust the line thickness with glLineWidth and anti-alias it with glEnable(GL_LINE_SMOOTH) if you want. void drawCircle&#40;GLfloat x, GLfloat y, GLfloat r&#41; &#123; &#160; &#160; static const double inc = M_PI [...]]]></description>
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