Python vtk学习(1)

Vtk，（visualization toolkit）是一个开源的免费软件系统，主要用于三维计算机图形学、图像处理和可视化。Vtk是在面向对象原理的基础上设计和实现的，它的内核是用C++构建的，包含有大约250,000行代码，2000多个类，还包含有几个转换界面，因此也可以自由的通过Java，Tcl/Tk和Python各种语言使用vtk。以下介绍VTK对于STL图像的基本操作

STL图像加载、缩放、旋转

import os

import vtk

base_file = "E:\\study\\company\\model"
test_file = "dongmai.stl"
actor = vtk.vtkActor()

def show(file_name):
# load stl file
reader = vtk.vtkSTLReader()
reader.SetFileName(file_name)

mapper = vtk.vtkPolyDataMapper()
mapper.SetInputConnection(reader.GetOutputPort())

actor.SetMapper(mapper)
# actor.RotateY(45)

# Create a rendering window and renderer
ren = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren)

# Create a renderwindowinteractor
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)

# Assign actor to the renderer
ren.AddActor(actor)

# Enable user interface interactor
iren.Initialize()
renWin.Render()
iren.Start()
return iren

# 绕x轴旋转
def rotate_x(num):
actor.RotateX(num)

def rotate_y(num):
actor.RotateY(num)

def rotate_z(num):
actor.RotateZ(num)

# 设置方向
def set_origin(x, y, z):
actor.SetOrientation(x, y, z)

def get_origin():
return actor.GetOrientation()

# 缩放
def set_scale(x, y, z):
actor.SetScale(x, y, z)

def main():
show(os.path.join(base_file, test_file))

if __name__ == '__main__':
main()

显示结果

鼠标事件监听

# 监听事件
class MyEvent(vtk.vtkInteractorStyleTrackballCamera):

def __init__(self, parent=None):
# 鼠标中键
self.AddObserver("MiddleButtonPressEvent", self.middle_button_press_event)
self.AddObserver("MiddleButtonReleaseEvent", self.middle_button_release_event)
# 鼠标左键
self.AddObserver("LeftButtonPressEvent", self.left_button_press_event)
self.AddObserver("LeftButtonReleaseEvent", self.left_button_release_event)
# 鼠标右键
self.AddObserver("RightButtonPressEvent", self.right_button_press_event)
self.AddObserver("RightButtonReleaseEvent", self.right_button_release_event)

def middle_button_press_event(self, obj, event):
print("Middle Button pressed")
self.OnMiddleButtonDown()
return

def middle_button_release_event(self, obj, event):
print("Middle Button released")
self.OnMiddleButtonUp()
return

def left_button_press_event(self, obj, event):
print("Left Button pressed")
self.OnLeftButtonDown()
return

def left_button_release_event(self, obj, event):
print("Left Button released")
self.OnLeftButtonUp()
return

def right_button_press_event(self, obj, event):
print("right Button pressed")
self.OnRightButtonDown()
return

def right_button_release_event(self, obj, event):
print("right Button released")
self.OnLeftButtonUp()
return

# 引入上一段代码调用
iren.SetInteractorStyle(MyEvent())

结果

参考文档

Python VTK Example
VTK笔记——模型的空间变换(Transform).平移、旋转和缩放