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import cairo
import draw
def render(res, format, filename):
handlers = {
"png": (lambda w,h: cairo.ImageSurface(cairo.FORMAT_ARGB32,w,h), lambda sfc: sfc.write_to_png(filename)),
"pdf": (lambda w,h: cairo.PDFSurface(filename, w, h), lambda sfc: 0),
"svg": (lambda w,h: cairo.SVGSurface(filename, w, h), lambda sfc: 0)
}
if not(handlers.has_key(format)):
print "Unknown format '%s'." % format
return 10
make_surface, write_surface = handlers[format]
w,h = draw.extents(*res)
w = max(w, draw.MIN_IMG_W)
surface = make_surface(w,h)
ctx = cairo.Context(surface)
draw.render(ctx, *res)
write_surface(surface)
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