This is a small project written very quickly trying to show some OpenGLES tricks to draw an EKG curve on an iPhone.
A question for some tips for this was posted by Jont Olof Lyttkens on http://groups.google.com/group/cocoaheads-stockholm
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The curve is drawn three times with different colors and width
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Each vertex is also drawn as a point to get a smoother line
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A texture is used to draw the halo and also used when drawing the lit grid
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GL_LINE_SMOOTH does not exist in pre-3GS devices. FBO could perhaps be used to create a nicer line
Note: cloned and compiled with latest Xcode, worked on SDK 3.0