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Added tripcolor triangle-centred colour values. #850

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Merged
merged 7 commits into from
Aug 16, 2012
Merged

Added tripcolor triangle-centred colour values. #850

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7c7b037
Added tripcolor triangle-centred colour values.
ianthomas23 Apr 22, 2012
b1812f7
tripcolor shading='faceted' deprecated in favour of edgecolors.
ianthomas23 Aug 13, 2012
8a21c57
Removed confusing tripcolor kwarg colorpoints and using facecolors
ianthomas23 Aug 14, 2012
f5f357e
Added tripcolor facecolors example.
ianthomas23 Aug 14, 2012
ece0fb1
Added tripcolor unit test.
ianthomas23 Aug 14, 2012
cd9212d
Corrected tripcolor documentation.
ianthomas23 Aug 16, 2012
4f5d3ce
Replaced backslash line continuators with parentheses.
ianthomas23 Aug 16, 2012
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Added tripcolor facecolors example.
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@ianthomas23
ianthomas23 committed Aug 15, 2012
commit f5f357e8fdb107963416b4caf579cbb75b9eb1f3
20 changes: 12 additions & 8 deletions examples/pylab_examples/tripcolor_demo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,19 +32,19 @@
mask = np.where(xmid*xmid + ymid*ymid < min_radius*min_radius, 1, 0)
triang.set_mask(mask)

# pcolor plot.
# tripcolor plot.
plt.figure()
plt.gca().set_aspect('equal')
plt.tripcolor(triang, z, shading='flat', cmap=plt.cm.rainbow)
plt.colorbar()
plt.title('tripcolor of Delaunay triangulation: flat')
plt.title('tripcolor of Delaunay triangulation, flat shading')

# Illustrate Gouraud shading.
plt.figure()
plt.gca().set_aspect('equal')
plt.tripcolor(triang, z, shading='gouraud', cmap=plt.cm.rainbow)
plt.colorbar()
plt.title('tripcolor with Gouraud shading')
plt.title('tripcolor of Delaunay triangulation, gouraud shading')


# You can specify your own triangulation rather than perform a Delaunay
Expand All @@ -70,9 +70,6 @@
[-0.057,0.916],[-0.025,0.933],[-0.077,0.990],[-0.059,0.993] ])
x = xy[:,0]*180/3.14159
y = xy[:,1]*180/3.14159
x0 = -5
y0 = 52
z = np.exp(-0.01*( (x-x0)*(x-x0) + (y-y0)*(y-y0) ))

triangles = np.asarray([
[67,66, 1],[65, 2,66],[ 1,66, 2],[64, 2,65],[63, 3,64],[60,59,57],
Expand All @@ -90,14 +87,21 @@
[32,31,33],[39,38,72],[33,72,38],[33,38,34],[37,35,38],[34,38,35],
[35,37,36] ])

xmid = x[triangles].mean(axis=1)
ymid = y[triangles].mean(axis=1)
x0 = -5
y0 = 52
zfaces = np.exp(-0.01*( (xmid-x0)*(xmid-x0) + (ymid-y0)*(ymid-y0) ))

# Rather than create a Triangulation object, can simply pass x, y and triangles
# arrays to tripcolor directly. It would be better to use a Triangulation object
# if the same triangulation was to be used more than once to save duplicated
# calculations.
# Can specify one color value per face rather than one per point by using the
# facecolors kwarg.
plt.figure()
plt.gca().set_aspect('equal')
plt.tripcolor(x, y, triangles, z, shading='flat', edgecolors='k',
cmap='summer')
plt.tripcolor(x, y, triangles, facecolors=zfaces, edgecolors='k')
plt.colorbar()
plt.title('tripcolor of user-specified triangulation')
plt.xlabel('Longitude (degrees)')
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