KeyPressInteractorStyle
在vtk 中有时我们需要监听 键盘或鼠标做一些事；
1. 创建 Actor；
Sphere = vtk.vtkSphereSource()
Sphere.SetRadius(10)mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(Sphere.GetOutputPort())
actor = vtk.vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetColor(0.0, 1.0, 0.0)2.创建 vtkRenderer vtkRenderWindow vtkRenderWindowInteractor
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)3.重写交互器 Style
class KeyPressInteractorStyle(vtk.vtkInteractorStyleTrackballCamera):def __init__(self, parent=None):self.parent = vtk.vtkRenderWindowInteractor()if (parent is not None):self.parent = parentself.AddObserver("KeyReleaseEvent", self.keyRelease)def keyRelease(self, obj, event):key = self.parent.GetKeySym()if key == 'Up':pt = actor.GetPosition()actor.SetPosition(pt[0],pt[1]+5,pt[2])elif key == 'Down':pt = actor.GetPosition()actor.SetPosition(pt[0],pt[1]-5,pt[2])if key == 'Left':pt = actor.GetPosition()actor.SetPosition(pt[0]-5,pt[1],pt[2])elif key == 'Right':pt = actor.GetPosition()actor.SetPosition(pt[0]+5,pt[1],pt[2])elif key== 'c':# 产生随机颜色r = vtk.vtkMath.Random()g = vtk.vtkMath.Random()b = vtk.vtkMath.Random()actor.GetProperty().SetColor(r, g, b)renWin.Render()
4.添加交互器：
iren.SetInteractorStyle(KeyPressInteractorStyle(parent=iren))ren.AddActor(actor)
