我在Python-VTK(7)中有一个简单的程序,该程序具有3D 2D磁盘,可以单击并移动它们。
我通过创建自定义的交互器样式来做到这一点,在该样式中,我将选定的元素存储在LeftButtonClick
事件中,更改先前选定的元素在MouseMove
事件中的位置,并将选定的元素设置为None
onLeftButtonRelease
事件。
这是完整的VTK代码(理想情况下)应该这样做:
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()
结果看起来像这样:
即,无论我选择哪个磁盘,都只会选择绿色的磁盘vtkPropPicker
。
由于某些原因,当我使用Python2-VTK6.3.0而不是Python3-VTK7时,事情按预期工作。这是VTK7中的错误吗?还是以某种方式更改了实现?或者是别的什么?
VTK 7切换到新的渲染后端。在7.0中,渲染后端存在一个选择2D actor的错误。
该错误已在7.1中修复;请参阅Kitware / VTK @5559c11
。
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