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An agg http://antigrain.com/ backend
Features that are implemented
* capstyles and join styles
* dashes
* linewidth
* lines, rectangles, ellipses
* clipping to a rectangle
* output to RGBA and PNG
* alpha blending
* DPI scaling properly - everything scales properly (dashes, linewidths, etc)
* draw polygon
* freetype2 w/ ft2font
TODO:
* allow save to file handle
* integrate screen dpi w/ ppi and text
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The renderer handles all the drawing primitives using a graphics
context instance that controls the colors/styles
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Render the text
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get the width and height in display coords of the string s
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Create a new figure manager instance
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The canvas the figure renders into. Calls the draw and print fig
methods, creates the renderers, etc...
Public attribute
figure - A Figure instance
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Draw the figure using the renderer
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