/[escript]/trunk/pyvisi/py_src/arrows.py
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Contents of /trunk/pyvisi/py_src/arrows.py

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Revision 835 - (show annotations)
Mon Sep 4 22:20:28 2006 UTC (14 years, 2 months ago) by jongui
File MIME type: text/x-python
File size: 1745 byte(s)
Added more docstrings and updated the way positions, focal point and view angle are specified.


1 """
2 Class that shows a vector field by arrows.
3 """
4
5 import vtk
6 from common import *
7
8 class Arrows(Common):
9 """
10 @author: John Ngui
11 @author: Lutz Gross
12 """
13
14 def __init__(self, open_scene, data_collector):
15 """
16 @type open_scene: L{OpenScene <openscene.OpenScene>} object
17 @param open_scene: Scene in which components are to be added to
18 @type data_collector: L{DataCollector <datacollector.DataCollector>}
19 object
20 @param data_collector: Source of data for visualization
21 """
22
23 Common.__init__(self, open_scene, data_collector)
24 self.vtk_glyph = None
25 self.setArrows()
26
27 Common.setMapper(self, "self.vtk_glyph.GetOutput()")
28 Common.setActor(self)
29 Common.addActor(self)
30
31 def setArrows(self):
32 """
33 Set up the glyph and use arrows as the source.
34 """
35
36 vtk_arrows = vtk.vtkArrowSource()
37
38 self.vtk_glyph = vtk.vtkGlyph3D()
39 self.vtk_glyph.SetInput(self.data_collector.getReader().GetOutput())
40 self.vtk_glyph.SetSource(vtk_arrows.GetOutput())
41 self.vtk_glyph.SetVectorModeToUseVector() # Default vector mode
42 self.vtk_glyph.SetScaleModeToScaleByVector() # Default scale mode
43 self.setColorMode("Scalar") # Default color mode
44 self.setScaleFactor(0.2) # Default scale factor
45
46 def setScaleFactor(self, scale_factor):
47 """
48 Set the scale factor for the arrows.
49
50 @type scale_factor: Number
51 @param scale_factor: Scale factor
52 """
53
54 self.vtk_glyph.SetScaleFactor(scale_factor)
55
56 def setColorMode(self, color_mode):
57 """
58 Set the color mode for the arrows.
59
60 @type color_mode: String
61 @param color_mode: Color mode for the arrows (I{Scalar or Vector})
62 """
63
64 eval("self.vtk_glyph.SetColorModeToColorBy%s()" % color_mode)
65
66 """
67 class ArrowsOnPlane:
68 shows a vector field by arrows on a plane
69 """
70 pass

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