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#!/usr/bin/env python
# This example demonstrates cell picking using vtkCellPicker. It
# displays the results of picking using a vtkTextMapper.
from __future__ import print_function
import vtk
# create a sphere source, mapper, and actor
sphere = vtk.vtkSphereSource()
sphereMapper = vtk.vtkPolyDataMapper()
sphereMapper.SetInputConnection(sphere.GetOutputPort())
sphereMapper.GlobalImmediateModeRenderingOn()
sphereActor = vtk.vtkLODActor()
sphereActor.SetMapper(sphereMapper)
# create the spikes by glyphing the sphere with a cone. Create the
# mapper and actor for the glyphs.
cone = vtk.vtkConeSource()
glyph = vtk.vtkGlyph3D()
glyph.SetInputConnection(sphere.GetOutputPort())
glyph.SetSourceConnection(cone.GetOutputPort())
glyph.SetVectorModeToUseNormal()
glyph.SetScaleModeToScaleByVector()
glyph.SetScaleFactor(0.25)
spikeMapper = vtk.vtkPolyDataMapper()
spikeMapper.SetInputConnection(glyph.GetOutputPort())
spikeActor = vtk.vtkLODActor()
spikeActor.SetMapper(spikeMapper)
# Create a text mapper and actor to display the results of picking.
textMapper = vtk.vtkTextMapper()
tprop = textMapper.GetTextProperty()
tprop.SetFontFamilyToArial()
tprop.SetFontSize(10)
tprop.BoldOn()
tprop.ShadowOn()
tprop.SetColor(1, 0, 0)
textActor = vtk.vtkActor2D()
textActor.VisibilityOff()
textActor.SetMapper(textMapper)
# Create a cell picker.
picker = vtk.vtkCellPicker()
# Create a Python function to create the text for the text mapper used
# to display the results of picking.
def annotatePick(object, event):
print("pick")
global picker, textActor, textMapper
if picker.GetCellId() < 0:
textActor.VisibilityOff()
else:
selPt = picker.GetSelectionPoint()
pickPos = picker.GetPickPosition()
textMapper.SetInput("(%.6f, %.6f, %.6f)"%pickPos)
textActor.SetPosition(selPt[:2])
textActor.VisibilityOn()
# Now at the end of the pick event call the above function.
picker.AddObserver("EndPickEvent", annotatePick)
# Create the Renderer, RenderWindow, etc. and set the Picker.
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
iren.SetPicker(picker)
# Add the actors to the renderer, set the background and size
ren.AddActor2D(textActor)
ren.AddActor(sphereActor)
ren.AddActor(spikeActor)
ren.SetBackground(1, 1, 1)
renWin.SetSize(300, 300)
# Get the camera and zoom in closer to the image.
ren.ResetCamera()
cam1 = ren.GetActiveCamera()
cam1.Zoom(1.4)
iren.Initialize()
# Initially pick the cell at this location.
picker.Pick(85, 126, 0, ren)
renWin.Render()
iren.Start()
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