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| View Original: | Torus cycles.svg (100x100) | |||
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| Keywords: Torus cycles.svg torus Radius of magenta circle is <math>R 15</math> and radius of red circle is <math>r 5</math> Image created in python and subsequently cropped and rotated manually using a text editor 2014-04-14 12 34 14 own Krishnavedala 150px valid SVG This plot was created using python Created with Matplotlib <syntaxhighlight lang python > from mpl_toolkits mplot3d import axes3d from matplotlib patches import Circle import matplotlib pyplot as plt import mpl_toolkits mplot3d art3d as art3d import numpy as np R r 15 5 def get_x phi theta global r R return R + r np cos phi np cos theta def get_y phi theta global r R return R + r np cos phi np sin theta def get_z phi theta global r return r np sin phi if __name__ __main__ fig plt figure figsize 10 10 ax fig add_subplot 111 projection '3d' ph th np linspace -np pi np pi 30 phi theta np meshgrid ph th x np array get_x p t for p t in zip np ravel phi np ravel theta X x reshape phi shape y np array get_y p t for p t in zip np ravel phi np ravel theta Y y reshape phi shape z np array get_z p t for p t in zip np ravel phi np ravel theta Z z reshape phi shape C1 Circle R 0 radius r fc 'none' ec 'red' C2 Circle 0 0 radius R fc 'none' ec 'magenta' ax plot_wireframe X Y Z color ' CCCCCC' ax add_patch C1 ax add_patch C2 art3d pathpatch_2d_to_3d C1 z 0 zdir 'y' art3d pathpatch_2d_to_3d C2 z r zdir 'z' ax set_xlim3d -20 20 ax set_ylim3d -20 20 ax set_zlim3d -20 20 ax set_xlabel 'X' ax set_ylabel 'Y' ax set_zlabel 'Z' ax set_axis_off ax view_init elev 30 azim -45 plt show plt savefig 'torus svg' bbox_inches 'tight' pad_inches 15 \ bbox_extra_artists C1 C2 transparent 'true' </syntaxhighlight> cob cc-zero Torus Fundamental group SVG mathematics Images with Python source code | ||||
