Andrea, > Basically I have a set of x, y data (around 1,000 elements each) and I > want to create 2 parallel "curves" (offset curves) to the original > one; "parallel" means curves which are displaced from the base curve > by a constant offset, either positive or negative, in the direction of > the curve's normal. Something like this: > > http://pyx.sourceforge.net/examples/drawing2/parallel.html
THis is called "buffering" in GIS parlance -- there are functions available to do it in GIS an computational geometry libraries: you might look in the shapely package: https://github.com/sgillies/shapely or CGAL http://www.cgal.org/ If the overhead of these packages is too much, and you still want to write your own code, try googling: "buffering a line GIS algorithm" or something like that, and you'll find pointers. > But by plotting these thing out with matplotlib it seems to me they > don't really look very parallel nor very constant-distance. as we say on the wxPython list -- post a fully functional example, so we can check it out. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
