1. A method of rendering a shape defined at least in part by a cubic curve on a computer comprising a display device, the method comprising: identifying Bezier control points for the cubic curve, the Bezier control points defining a polygon around the cubic curve; creating a projection of the cubic curve and the polygon into a texture space; for each of a plurality of pixels inside the polygon, determining on which side of the curve the pixel lies in the polygon based on the projection of the pixel into the texture space; and rendering the shape in an image by, for each of the plurality of pixels, choosing a color at least in part according to which side of the curve the pixel lies on in the polygon and rendering the pixel in the chosen color;, and displaying the image on the display device.