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July 4, 2016 19:27
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Picking of 2D Actors in VTK-Python
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| import vtk | |
| class CustomInteractor(vtk.vtkInteractorStyleTrackballCamera): | |
| def __init__(self, renderer, renWin): | |
| self.AddObserver('LeftButtonPressEvent', self.OnLeftButtonDown) | |
| self.AddObserver('LeftButtonReleaseEvent', self.OnLeftButtonRelease) | |
| self.AddObserver('MouseMoveEvent', self.OnMouseMove) | |
| self.renderer = renderer | |
| self.chosenPiece = None | |
| self.renWin = renWin | |
| def OnLeftButtonRelease(self, obj, eventType): | |
| self.chosenPiece = None | |
| vtk.vtkInteractorStyleTrackballCamera.OnLeftButtonUp(self) | |
| def OnLeftButtonDown(self, obj, eventType): | |
| clickPos = self.GetInteractor().GetEventPosition() | |
| picker = vtk.vtkPropPicker() | |
| picker.Pick(clickPos[0], clickPos[1], 0, self.renderer) | |
| actor = picker.GetActor2D() | |
| self.chosenPiece = actor | |
| vtk.vtkInteractorStyleTrackballCamera.OnLeftButtonDown(self) | |
| def OnMouseMove(self, obj, eventType): | |
| if self.chosenPiece is not None: | |
| mousePos = self.GetInteractor().GetEventPosition() | |
| self.chosenPiece.SetPosition(mousePos[0], mousePos[1]) | |
| self.renWin.Render() | |
| else : | |
| vtk.vtkInteractorStyleTrackballCamera.OnMouseMove(self) | |
| def buildDiskActor(inner_radius = 10, outer_radius = 20, position = (100, 20), color = (1, 1, 1)): | |
| disk = vtk.vtkDiskSource() | |
| disk.SetInnerRadius(inner_radius) | |
| disk.SetOuterRadius(outer_radius) | |
| disk.SetRadialResolution(100) | |
| disk.SetCircumferentialResolution(100) | |
| disk.Update() | |
| mapper = vtk.vtkPolyDataMapper2D() | |
| mapper.SetInputConnection(disk.GetOutputPort()) | |
| actor = vtk.vtkActor2D() | |
| actor.SetMapper(mapper) | |
| actor.SetPosition(position[0], position[1]) | |
| actor.GetProperty().SetColor(color) | |
| return actor | |
| ren = vtk.vtkRenderer() | |
| renWin = vtk.vtkRenderWindow() | |
| renWin.AddRenderer(ren) | |
| renWin.SetSize(600, 600) | |
| elements = [ | |
| buildDiskActor(position = (200, 400), color=(1, 0, 0)), | |
| buildDiskActor(position = (400, 400), color=(0, 1, 0)), | |
| buildDiskActor(position = (300, 200), color=(0, 0, 1)), | |
| ] | |
| for actor in elements: | |
| ren.AddActor(actor) | |
| iren = vtk.vtkRenderWindowInteractor() | |
| iren.SetRenderWindow(renWin) | |
| inStyle = CustomInteractor(ren, renWin) | |
| iren.SetInteractorStyle(inStyle) | |
| renWin.Render() | |
| iren.Start() |
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