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#!/usr/bin/env python
import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
# demonstrate use of point labeling and the selection window
# Create the RenderWindow, Renderer and both Actors
#
ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
# Create a selection window
xmin = 200
xLength = 100
xmax = xmin + xLength
ymin = 200
yLength = 100
ymax = ymin + yLength
pts = vtk.vtkPoints()
pts.InsertPoint(0, xmin, ymin, 0)
pts.InsertPoint(1, xmax, ymin, 0)
pts.InsertPoint(2, xmax, ymax, 0)
pts.InsertPoint(3, xmin, ymax, 0)
rect = vtk.vtkCellArray()
rect.InsertNextCell(5)
rect.InsertCellPoint(0)
rect.InsertCellPoint(1)
rect.InsertCellPoint(2)
rect.InsertCellPoint(3)
rect.InsertCellPoint(0)
selectRect = vtk.vtkPolyData()
selectRect.SetPoints(pts)
selectRect.SetLines(rect)
rectMapper = vtk.vtkPolyDataMapper2D()
rectMapper.SetInputData(selectRect)
rectActor = vtk.vtkActor2D()
rectActor.SetMapper(rectMapper)
# Create asphere
sphere = vtk.vtkSphereSource()
sphereMapper = vtk.vtkPolyDataMapper()
sphereMapper.SetInputConnection(sphere.GetOutputPort())
sphereActor = vtk.vtkActor()
sphereActor.SetMapper(sphereMapper)
# Generate ids for labeling
ids = vtk.vtkIdFilter()
ids.SetInputConnection(sphere.GetOutputPort())
ids.PointIdsOn()
ids.CellIdsOn()
ids.FieldDataOn()
# Create labels for points
visPts = vtk.vtkSelectVisiblePoints()
visPts.SetInputConnection(ids.GetOutputPort())
visPts.SetRenderer(ren1)
visPts.SelectionWindowOn()
visPts.SetSelection(xmin, xmin + xLength, ymin, ymin + yLength)
ldm = vtk.vtkLabeledDataMapper()
ldm.SetInputConnection(visPts.GetOutputPort())
# ldm.SetLabelFormat.("%g")
# ldm.SetLabelModeToLabelScalars()
# ldm.SetLabelModeToLabelNormals()
ldm.SetLabelModeToLabelFieldData()
# ldm.SetLabeledComponent(0)
pointLabels = vtk.vtkActor2D()
pointLabels.SetMapper(ldm)
# Create labels for cells
cc = vtk.vtkCellCenters()
cc.SetInputConnection(ids.GetOutputPort())
visCells = vtk.vtkSelectVisiblePoints()
visCells.SetInputConnection(cc.GetOutputPort())
visCells.SetRenderer(ren1)
visCells.SelectionWindowOn()
visCells.SetSelection(xmin, xmin + xLength, ymin, ymin + yLength)
cellMapper = vtk.vtkLabeledDataMapper()
cellMapper.SetInputConnection(visCells.GetOutputPort())
# cellMapper.SetLabelFormat("%g")
# cellMapper.SetLabelModeToLabelScalars()
# cellMapper.SetLabelModeToLabelNormals()
cellMapper.SetLabelModeToLabelFieldData()
cellMapper.GetLabelTextProperty().SetColor(0, 1, 0)
cellLabels = vtk.vtkActor2D()
cellLabels.SetMapper(cellMapper)
# Add the actors to the renderer, set the background and size
#
ren1.AddActor(sphereActor)
ren1.AddActor2D(rectActor)
ren1.AddActor2D(pointLabels)
ren1.AddActor2D(cellLabels)
ren1.SetBackground(1, 1, 1)
renWin.SetSize(500, 500)
renWin.Render()
# render the image
#
def PlaceWindow (xmin, ymin):
global xLength, yLength
xmax = xmin + xLength
ymax = ymin + yLength
visPts.SetSelection(xmin, xmax, ymin, ymax)
visCells.SetSelection(xmin, xmax, ymin, ymax)
pts.InsertPoint(0, xmin, ymin, 0)
pts.InsertPoint(1, xmax, ymin, 0)
pts.InsertPoint(2, xmax, ymax, 0)
pts.InsertPoint(3, xmin, ymax, 0)
pts.Modified()
# because insertions don't modify object - performance reasons
renWin.Render()
def MoveWindow ():
y = 100
while y < 300:
x = 100
while x < 300:
PlaceWindow(x, y)
x += 25
y += 25
MoveWindow()
PlaceWindow(xmin, ymin)
#iren.Start()
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