.. _units-ellipse_with_units: units example code: ellipse_with_units.py ========================================= .. plot:: /home/tcaswell/source/p/matplotlib/doc/mpl_examples/units/ellipse_with_units.py :: """ Compare the ellipse generated with arcs versus a polygonal approximation """ from basic_units import cm import numpy as np from matplotlib import patches import matplotlib.pyplot as plt xcenter, ycenter = 0.38*cm, 0.52*cm #xcenter, ycenter = 0., 0. width, height = 1e-1*cm, 3e-1*cm angle = -30 theta = np.arange(0.0, 360.0, 1.0)*np.pi/180.0 x = 0.5 * width * np.cos(theta) y = 0.5 * height * np.sin(theta) rtheta = np.radians(angle) R = np.array([ [np.cos(rtheta), -np.sin(rtheta)], [np.sin(rtheta), np.cos(rtheta)], ]) x, y = np.dot(R, np.array([x, y])) x += xcenter y += ycenter fig = plt.figure() ax = fig.add_subplot(211, aspect='auto') ax.fill(x, y, alpha=0.2, facecolor='yellow', edgecolor='yellow', linewidth=1, zorder=1) e1 = patches.Ellipse((xcenter, ycenter), width, height, angle=angle, linewidth=2, fill=False, zorder=2) ax.add_patch(e1) ax = fig.add_subplot(212, aspect='equal') ax.fill(x, y, alpha=0.2, facecolor='green', edgecolor='green', zorder=1) e2 = patches.Ellipse((xcenter, ycenter), width, height, angle=angle, linewidth=2, fill=False, zorder=2) ax.add_patch(e2) #fig.savefig('ellipse_compare.png') fig.savefig('ellipse_compare') fig = plt.figure() ax = fig.add_subplot(211, aspect='auto') ax.fill(x, y, alpha=0.2, facecolor='yellow', edgecolor='yellow', linewidth=1, zorder=1) e1 = patches.Arc((xcenter, ycenter), width, height, angle=angle, linewidth=2, fill=False, zorder=2) ax.add_patch(e1) ax = fig.add_subplot(212, aspect='equal') ax.fill(x, y, alpha=0.2, facecolor='green', edgecolor='green', zorder=1) e2 = patches.Arc((xcenter, ycenter), width, height, angle=angle, linewidth=2, fill=False, zorder=2) ax.add_patch(e2) #fig.savefig('arc_compare.png') fig.savefig('arc_compare') plt.show() Keywords: python, matplotlib, pylab, example, codex (see :ref:`how-to-search-examples`)