Hi, matplotlib can make a contour plot on a masked array z using contourf(x,y,z).but it seems that it draws in a raster mode.there is sawtooth at the edge of the picture when it is zoomed.can contour be drawed in a vector mode? i means that 1) give an array z which has not been masked. 2) contourf 3) using a ploygon array as a mask instead of using a masked grid array. the part out of the polygon will be clipped.it seems that cairo and agg can both work in this way.
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