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POmatplotlib path linewidth connected to figure zoom
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2013-03-27T22:44:29.993
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Body
Is it possible to tie the linewidth of a matplotlib path to the figure zoom/scale level? I am drawing a map where the matplotlib path (with bezier curves) draws the road on the map. Upon zooming in I would like the width of the path to zoom in. In attached script, the polygonal approximation can properly zoom, but the path (red line) cannot zoom (in width). Is it possible to tie the linewidth to some scale transformation and redraw via callback ? <pre><code>import matplotlib.pyplot as plt from matplotlib.path import Path import matplotlib.patches as patches import numpy as np def main(): ax = plt.subplot(111) verts = np.array([ (0., 0.), (0.5, .5), (1., 0.8), (0.8, 0.)]) codes = np.array([Path.MOVETO, Path.CURVE4, Path.CURVE4, Path.LINETO ]) # Can this curve have zoomable width path = Path(verts, codes) patch = patches.PathPatch(path, fc='none', color='r', lw=4, zorder=3) ax.add_patch(patch) ax.plot(verts[:,0], verts[:,1], 'o--', lw=2, color='k', zorder=2) # these will be polygonal approx that will have proper zoom v=np.array([]).reshape((-1,2)) c=[] for i in range(len(verts)-1): vtmp, ctmp = line2poly(verts[[i,i+1],:],0.03) v = np.vstack( (v,vtmp) ) c = np.concatenate( (c,ctmp) ) path_zoom = Path(v,c) patch_zoom = patches.PathPatch(path_zoom, fc='r', ec='k', zorder=1, alpha=0.4) ax.add_patch(patch_zoom) ax.set_xlim(-0.1, 1.1) ax.set_ylim(-0.1, 1.1) plt.show() def line2poly(line, width): dx,dy = np.hstack(np.diff(line,axis=0)).tolist() theta = np.arctan2(dy,dx) print(np.hstack(np.diff(line,axis=0)).tolist()) print(np.degrees(theta)) s = width/2 * np.sin(theta) c = width/2 * np.cos(theta) trans = np.array([(-s,c),(s,-c),(s,-c),(-s,c)]) verts = line[[0,0,1,1],:]+trans verts = np.vstack((verts, verts[0,:])) codes = np.array([Path.MOVETO, Path.LINETO, Path.LINETO, Path.LINETO, Path.CLOSEPOLY]) return verts,codes if __name__=='__main__': main() </code></pre>
Tags
<python><python-3.x><matplotlib>
Title
matplotlib path linewidth connected to figure zoom
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1. PO
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