Trifinder事件实例
实例展示Trifinder对象对的使用。当鼠标移动到一个被分割的三角形上,这个三角形高亮显示,并且它的标签在图标题显示。
展示下演示结果:
完整代码:
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import matplotlib.pyplot as plt from matplotlib.tri import Triangulation from matplotlib.patches import Polygon import numpy as np def update_polygon(tri): if tri = = - 1 : points = [ 0 , 0 , 0 ] else : points = triang.triangles[tri] xs = triang.x[points] ys = triang.y[points] polygon.set_xy( list ( zip (xs, ys))) def motion_notify(event): if event.inaxes is None : tri = - 1 else : tri = trifinder(event.xdata, event.ydata) update_polygon(tri) plt.title( 'In triangle %i' % tri) event.canvas.draw() # Create a Triangulation. n_angles = 16 n_radii = 5 min_radius = 0.25 radii = np.linspace(min_radius, 0.95 , n_radii) angles = np.linspace( 0 , 2 * np.pi, n_angles, endpoint = False ) angles = np.repeat(angles[..., np.newaxis], n_radii, axis = 1 ) angles[:, 1 :: 2 ] + = np.pi / n_angles x = (radii * np.cos(angles)).flatten() y = (radii * np.sin(angles)).flatten() triang = Triangulation(x, y) triang.set_mask(np.hypot(x[triang.triangles].mean(axis = 1 ), y[triang.triangles].mean(axis = 1 )) < min_radius) # Use the triangulation's default TriFinder object. trifinder = triang.get_trifinder() # Setup plot and callbacks. plt.subplot( 111 , aspect = 'equal' ) plt.triplot(triang, 'bo-' ) polygon = Polygon([[ 0 , 0 ], [ 0 , 0 ]], facecolor = 'y' ) # dummy data for xs,ys update_polygon( - 1 ) plt.gca().add_patch(polygon) plt.gcf().canvas.mpl_connect( 'motion_notify_event' , motion_notify) plt.show() |
总结
本文所示是一个Python+matplotlib实现的简单实例,希望对大家有所帮助。感兴趣的朋友可以继续参阅本站其他相关专题,如有不足之处,欢迎留言指出。感谢朋友们对本站的支持!
原文链接:https://matplotlib.org/index.html#