/[escript]/trunk/pyvisi/examples/meshPlot.py
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Contents of /trunk/pyvisi/examples/meshPlot.py

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Revision 337 - (show annotations)
Mon Dec 12 01:57:07 2005 UTC (13 years, 9 months ago) by cochrane
File MIME type: text/x-python
File size: 1899 byte(s)
Initial merge of pyvisi into esys repository.
1 # $Id: meshPlot.py,v 1.3 2005/11/08 08:23:45 paultcochrane Exp $
2
3 """
4 Example of plotting meshed surfaces with pyvisi
5 """
6
7 import sys
8 numArgs = len(sys.argv)
9 if numArgs == 1:
10 ren_mod = "gnuplot"
11 else:
12 ren_mod = sys.argv[1]
13
14 # set up some data to plot
15 from Numeric import *
16
17 # the x and y axes
18 x = arange(-2,2,0.2, typecode=Float)
19 y = arange(-2,3,0.2, typecode=Float)
20
21 # pick some interesting function to generate the data in the third dimension
22 # this is the one used in the matlab docs: z = x*exp(-x^2-y^2)
23 z = zeros((len(x),len(y)), typecode=Float)
24
25 # boy do *I* feel old fashioned writing it this way
26 # surely there's another way to do it: - something to do later
27 for i in range(len(x)):
28 for j in range(len(y)):
29 z[i,j] = x[i]*exp(-x[i]*x[i] - y[j]*y[j])
30
31 # import the general pyvisi stuff
32 from pyvisi import *
33 if ren_mod == "gnuplot":
34 from pyvisi.renderers.gnuplot import *
35 elif ren_mod == "vtk":
36 from pyvisi.renderers.vtk import *
37 else:
38 raise ValueError, "Unknown renderer module"
39
40 # define a scene object
41 # a Scene is a container for all of the kinds of things you want to put
42 # into your plot, for instance, images, meshes, arrow/vector/quiver
43 # plots, contour plots, spheres etc.
44 scene = Scene()
45
46 # create a MeshPlot object
47 plot = MeshPlot(scene)
48
49 # add some helpful info to the plot
50 plot.title = 'Example mesh plot'
51 plot.xlabel = 'x'
52 plot.ylabel = 'y'
53 plot.zlabel = 'z'
54
55 # assign the data to the plot
56 # this version assumes that we have x, then y, then z and that z is 2D
57 # and that x and y are 1D arrays
58 plot.setData(x,y,z)
59 # alternative syntax
60 #plot.setData(xData=x, yData=y, zData=z)
61 # or (but more confusing depending upon one's naming conventions)
62 #plot.setData(x=x, y=y, z=z)
63
64 # render the scene to screen
65 scene.render(pause=True, interactive=True)
66
67 # save the scene to file
68 scene.save(fname="meshPlot.png", format=PngImage())
69
70 # vim: expandtab shiftwidth=4:

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