On Fri, Mar 12, 2010 at 7:45 AM, othererik <othere...@gmail.com> wrote: > Here's a short example that does the opposite of what I'm looking for. The > goal is to take a the polygon "poly_patch" and "cut" regions out of it. > All I've managed to achieve so far has been to show regions of the > "poly_patch". >
With clip_path set, things inside the clip_path is only drawn. So, I think you're misusing clip_path. To draw a rectangle with a hole in it, you need to create a compound path. And, this requires some understanding of how path system works in general. See this, http://matplotlib.sourceforge.net/users/path_tutorial.html and http://old.nabble.com/Compound-paths-to19278422.html#a19296862 Here is modified version of your script that draws a rectangle with a hole. It concatenates two existing paths. But, often it is better to start from scratch (but again you need to understand how path works). And of course, the resulting compound path can be set as a clip_path of other artist. Regards, -JJ import matplotlib from matplotlib import patches import pylab fig=pylab.figure() ax=fig.add_subplot(111) # background line line = ax.plot( [ 1, 2, 3], [ 1, 2, 3 ] ) # mask polygon that should cover/hide the area not intersecting the poly_patch = patches.Polygon(((1,1),(1,3),(3,3), (3,1))) # part I would like to see through hole_patch = patches.Circle((2,2), radius=.5, facecolor='red') from matplotlib.bezier import make_path_regular, concatenate_paths from matplotlib.path import Path from matplotlib.patches import PathPatch poly_path = make_path_regular(poly_patch.get_path()) # close the path closed_polygon_path = Path(list(poly_path.vertices)+[(0,0)], list(poly_path.codes)+[Path.CLOSEPOLY]) # circle with coordinate transformed hole_path = hole_patch.get_path() hole_path_transformed = hole_patch.get_patch_transform().transform_path(hole_path) # make polygon with a hole poly_with_hole_path = concatenate_paths([closed_polygon_path, hole_path_transformed]) poly_with_hole_patch = PathPatch(poly_with_hole_path) ax.add_patch(poly_with_hole_patch) ax.set_xlim(0, 4) ax.set_ylim(0, 4) pylab.show() ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
