宜配屋

Python Grid使用和布局详解

yipeiwu_com6年前Python基础

本文实例为大家分享了Python Grid使用和布局的具体代码，供大家参考，具体内容如下

#!/usr/bin/env python
 
import vtk
 
# 这个示例主要用于将不同的图像对象显示到指定的Grid中
 
def main():
 colors = vtk.vtkNamedColors()
 
 # Set the background color.
 colors.SetColor("BkgColor", [51, 77, 102, 255])
 
 titles = list()
 textMappers = list()
 textActors = list()
 
 uGrids = list()
 mappers = list()
 actors = list()
 renderers = list()
 
 uGrids.append(MakeHexagonalPrism())
 titles.append('Hexagonal Prism')
 uGrids.append(MakeHexahedron())
 titles.append('Hexahedron')
 uGrids.append(MakePentagonalPrism())
 titles.append('Pentagonal Prism')
 
 uGrids.append(MakePolyhedron())
 titles.append('Polyhedron')
 uGrids.append(MakePyramid())
 titles.append('Pyramid')
 uGrids.append(MakeTetrahedron())
 titles.append('Tetrahedron')
 
 uGrids.append(MakeVoxel())
 titles.append('Voxel')
 uGrids.append(MakeWedge())
 titles.append('Wedge')
 
 renWin = vtk.vtkRenderWindow()
 renWin.SetWindowName('Cell3D Demonstration')
 
 iRen = vtk.vtkRenderWindowInteractor()
 iRen.SetRenderWindow(renWin)
 
 # Create one text property for all
 textProperty = vtk.vtkTextProperty()
 textProperty.SetFontSize(16)
 textProperty.SetJustificationToCentered()
 
 # Create and link the mappers actors and renderers together.
 # 为每个独立的文本图形对象创建独立的Mapper和Actors，并绑定至每个grid中
 for i in range(0, len(uGrids)):
  textMappers.append(vtk.vtkTextMapper())
  textActors.append(vtk.vtkActor2D())#
 
  mappers.append(vtk.vtkDataSetMapper())
  actors.append(vtk.vtkActor())
  renderers.append(vtk.vtkRenderer())
 
  mappers[i].SetInputData(uGrids[i])
  actors[i].SetMapper(mappers[i])
  actors[i].GetProperty().SetColor(
   colors.GetColor3d("Seashell"))
  renderers[i].AddViewProp(actors[i])
 
  textMappers[i].SetInput(titles[i])
  textMappers[i].SetTextProperty(textProperty)
 
  textActors[i].SetMapper(textMappers[i])
  textActors[i].SetPosition(120, 16)
  renderers[i].AddViewProp(textActors[i])
 
  renWin.AddRenderer(renderers[i])
 
 gridDimensions = 3
 rendererSize = 300
 
 renWin.SetSize(rendererSize * gridDimensions,
     rendererSize * gridDimensions)
 
 # 渲染图形对象至不同的显示区域
 for row in range(0, gridDimensions):
  for col in range(0, gridDimensions):
   index = row * gridDimensions + col
 
   # (xmin, ymin, xmax, ymax)
   viewport = [
    float(col) * rendererSize /
    (gridDimensions * rendererSize),
    float(gridDimensions - (row + 1)) * rendererSize /
    (gridDimensions * rendererSize),
    float(col + 1) * rendererSize /
    (gridDimensions * rendererSize),
    float(gridDimensions - row) * rendererSize /
    (gridDimensions * rendererSize)]
 
   if index > len(actors) - 1:
    # Add a renderer even if there is no actor.
    # This makes the render window background all the same color.
    ren = vtk.vtkRenderer()
    ren.SetBackground(colors.GetColor3d("BkgColor"))
    ren.SetViewport(viewport)
    renWin.AddRenderer(ren)
    continue
 
   renderers[index].SetViewport(viewport)
   renderers[index].SetBackground(colors.GetColor3d("BkgColor"))
   renderers[index].ResetCamera()
   renderers[index].GetActiveCamera().Azimuth(30)
   renderers[index].GetActiveCamera().Elevation(-30)
   renderers[index].GetActiveCamera().Zoom(0.85)
   renderers[index].ResetCameraClippingRange()
 
 iRen.Initialize()
 renWin.Render()
 iRen.Start()
 
 
def MakeHexagonalPrism():
 """
  3D: hexagonal prism: a wedge with an hexagonal base.
  Be careful, the base face ordering is different from wedge.
 """
 
 numberOfVertices = 12
 
 points = vtk.vtkPoints()
 
 points.InsertNextPoint(0.0, 0.0, 1.0)
 points.InsertNextPoint(1.0, 0.0, 1.0)
 points.InsertNextPoint(1.5, 0.5, 1.0)
 points.InsertNextPoint(1.0, 1.0, 1.0)
 points.InsertNextPoint(0.0, 1.0, 1.0)
 points.InsertNextPoint(-0.5, 0.5, 1.0)
 
 points.InsertNextPoint(0.0, 0.0, 0.0)
 points.InsertNextPoint(1.0, 0.0, 0.0)
 points.InsertNextPoint(1.5, 0.5, 0.0)
 points.InsertNextPoint(1.0, 1.0, 0.0)
 points.InsertNextPoint(0.0, 1.0, 0.0)
 points.InsertNextPoint(-0.5, 0.5, 0.0)
 
 hexagonalPrism = vtk.vtkHexagonalPrism()
 for i in range(0, numberOfVertices):
  hexagonalPrism.GetPointIds().SetId(i, i)
 
 ug = vtk.vtkUnstructuredGrid()
 ug.InsertNextCell(hexagonalPrism.GetCellType(),
      hexagonalPrism.GetPointIds())
 ug.SetPoints(points)
 
 return ug
 
 
def MakeHexahedron():
 """
  A regular hexagon (cube) with all faces square and three squares around
  each vertex is created below.
  Setup the coordinates of eight points
  (the two faces must be in counter clockwise
  order as viewed from the outside).
  As an exercise you can modify the coordinates of the points to create
  seven topologically distinct convex hexahedras.
 """
 numberOfVertices = 8
 
 # Create the points
 points = vtk.vtkPoints()
 points.InsertNextPoint(0.0, 0.0, 0.0)
 points.InsertNextPoint(1.0, 0.0, 0.0)
 points.InsertNextPoint(1.0, 1.0, 0.0)
 points.InsertNextPoint(0.0, 1.0, 0.0)
 points.InsertNextPoint(0.0, 0.0, 1.0)
 points.InsertNextPoint(1.0, 0.0, 1.0)
 points.InsertNextPoint(1.0, 1.0, 1.0)
 points.InsertNextPoint(0.0, 1.0, 1.0)
 
 # Create a hexahedron from the points
 hex_ = vtk.vtkHexahedron()
 for i in range(0, numberOfVertices):
  hex_.GetPointIds().SetId(i, i)
 
 # Add the points and hexahedron to an unstructured grid
 uGrid = vtk.vtkUnstructuredGrid()
 uGrid.SetPoints(points)
 uGrid.InsertNextCell(hex_.GetCellType(), hex_.GetPointIds())
 
 return uGrid
 
 
def MakePentagonalPrism():
 numberOfVertices = 10
 
 # Create the points
 points = vtk.vtkPoints()
 points.InsertNextPoint(11, 10, 10)
 points.InsertNextPoint(13, 10, 10)
 points.InsertNextPoint(14, 12, 10)
 points.InsertNextPoint(12, 14, 10)
 points.InsertNextPoint(10, 12, 10)
 points.InsertNextPoint(11, 10, 14)
 points.InsertNextPoint(13, 10, 14)
 points.InsertNextPoint(14, 12, 14)
 points.InsertNextPoint(12, 14, 14)
 points.InsertNextPoint(10, 12, 14)
 
 # Pentagonal Prism
 pentagonalPrism = vtk.vtkPentagonalPrism()
 for i in range(0, numberOfVertices):
  pentagonalPrism.GetPointIds().SetId(i, i)
 
 # Add the points and hexahedron to an unstructured grid
 uGrid = vtk.vtkUnstructuredGrid()
 uGrid.SetPoints(points)
 uGrid.InsertNextCell(pentagonalPrism.GetCellType(),
       pentagonalPrism.GetPointIds())
 
 return uGrid
 
 
def MakePolyhedron():
 """
  Make a regular dodecahedron. It consists of twelve regular pentagonal
  faces with three faces meeting at each vertex.
 """
 # numberOfVertices = 20
 numberOfFaces = 12
 # numberOfFaceVertices = 5
 
 points = vtk.vtkPoints()
 points.InsertNextPoint(1.21412, 0, 1.58931)
 points.InsertNextPoint(0.375185, 1.1547, 1.58931)
 points.InsertNextPoint(-0.982247, 0.713644, 1.58931)
 points.InsertNextPoint(-0.982247, -0.713644, 1.58931)
 points.InsertNextPoint(0.375185, -1.1547, 1.58931)
 points.InsertNextPoint(1.96449, 0, 0.375185)
 points.InsertNextPoint(0.607062, 1.86835, 0.375185)
 points.InsertNextPoint(-1.58931, 1.1547, 0.375185)
 points.InsertNextPoint(-1.58931, -1.1547, 0.375185)
 points.InsertNextPoint(0.607062, -1.86835, 0.375185)
 points.InsertNextPoint(1.58931, 1.1547, -0.375185)
 points.InsertNextPoint(-0.607062, 1.86835, -0.375185)
 points.InsertNextPoint(-1.96449, 0, -0.375185)
 points.InsertNextPoint(-0.607062, -1.86835, -0.375185)
 points.InsertNextPoint(1.58931, -1.1547, -0.375185)
 points.InsertNextPoint(0.982247, 0.713644, -1.58931)
 points.InsertNextPoint(-0.375185, 1.1547, -1.58931)
 points.InsertNextPoint(-1.21412, 0, -1.58931)
 points.InsertNextPoint(-0.375185, -1.1547, -1.58931)
 points.InsertNextPoint(0.982247, -0.713644, -1.58931)
 
 # Dimensions are [numberOfFaces][numberOfFaceVertices]
 dodechedronFace = [
  [0, 1, 2, 3, 4],
  [0, 5, 10, 6, 1],
  [1, 6, 11, 7, 2],
  [2, 7, 12, 8, 3],
  [3, 8, 13, 9, 4],
  [4, 9, 14, 5, 0],
  [15, 10, 5, 14, 19],
  [16, 11, 6, 10, 15],
  [17, 12, 7, 11, 16],
  [18, 13, 8, 12, 17],
  [19, 14, 9, 13, 18],
  [19, 18, 17, 16, 15]
 ]
 
 dodechedronFacesIdList = vtk.vtkIdList()
 # Number faces that make up the cell.
 dodechedronFacesIdList.InsertNextId(numberOfFaces)
 for face in dodechedronFace:
  # Number of points in the face == numberOfFaceVertices
  dodechedronFacesIdList.InsertNextId(len(face))
  # Insert the pointIds for that face.
  [dodechedronFacesIdList.InsertNextId(i) for i in face]
 
 uGrid = vtk.vtkUnstructuredGrid()
 uGrid.InsertNextCell(vtk.VTK_POLYHEDRON, dodechedronFacesIdList)
 uGrid.SetPoints(points)
 
 return uGrid
 
 
def MakePyramid():
 """
  Make a regular square pyramid.
 """
 numberOfVertices = 5
 
 points = vtk.vtkPoints()
 
 p = [
  [1.0, 1.0, 0.0],
  [-1.0, 1.0, 0.0],
  [-1.0, -1.0, 0.0],
  [1.0, -1.0, 0.0],
  [0.0, 0.0, 1.0]
 ]
 for pt in p:
  points.InsertNextPoint(pt)
 
 pyramid = vtk.vtkPyramid()
 for i in range(0, numberOfVertices):
  pyramid.GetPointIds().SetId(i, i)
 
 ug = vtk.vtkUnstructuredGrid()
 ug.SetPoints(points)
 ug.InsertNextCell(pyramid.GetCellType(), pyramid.GetPointIds())
 
 return ug
 
 
def MakeTetrahedron():
 """
  Make a tetrahedron.
 """
 numberOfVertices = 4
 
 points = vtk.vtkPoints()
 points.InsertNextPoint(0, 0, 0)
 points.InsertNextPoint(1, 0, 0)
 points.InsertNextPoint(1, 1, 0)
 points.InsertNextPoint(0, 1, 1)
 
 tetra = vtk.vtkTetra()
 for i in range(0, numberOfVertices):
  tetra.GetPointIds().SetId(i, i)
 
 cellArray = vtk.vtkCellArray()
 cellArray.InsertNextCell(tetra)
 
 unstructuredGrid = vtk.vtkUnstructuredGrid()
 unstructuredGrid.SetPoints(points)
 unstructuredGrid.SetCells(vtk.VTK_TETRA, cellArray)
 
 return unstructuredGrid
 
 
def MakeVoxel():
 """
  A voxel is a representation of a regular grid in 3-D space.
 """
 numberOfVertices = 8
 
 points = vtk.vtkPoints()
 points.InsertNextPoint(0, 0, 0)
 points.InsertNextPoint(1, 0, 0)
 points.InsertNextPoint(0, 1, 0)
 points.InsertNextPoint(1, 1, 0)
 points.InsertNextPoint(0, 0, 1)
 points.InsertNextPoint(1, 0, 1)
 points.InsertNextPoint(0, 1, 1)
 points.InsertNextPoint(1, 1, 1)
 
 voxel = vtk.vtkVoxel()
 for i in range(0, numberOfVertices):
  voxel.GetPointIds().SetId(i, i)
 
 ug = vtk.vtkUnstructuredGrid()
 ug.SetPoints(points)
 ug.InsertNextCell(voxel.GetCellType(), voxel.GetPointIds())
 
 return ug
 
 
def MakeWedge():
 """
  A wedge consists of two triangular ends and three rectangular faces.
 """
 
 numberOfVertices = 6
 
 points = vtk.vtkPoints()
 
 points.InsertNextPoint(0, 1, 0)
 points.InsertNextPoint(0, 0, 0)
 points.InsertNextPoint(0, .5, .5)
 points.InsertNextPoint(1, 1, 0)
 points.InsertNextPoint(1, 0.0, 0.0)
 points.InsertNextPoint(1, .5, .5)
 
 wedge = vtk.vtkWedge()
 for i in range(0, numberOfVertices):
  wedge.GetPointIds().SetId(i, i)
 
 ug = vtk.vtkUnstructuredGrid()
 ug.SetPoints(points)
 ug.InsertNextCell(wedge.GetCellType(), wedge.GetPointIds())
 
 return ug
 
 
def WritePNG(renWin, fn, magnification=1):
 """
  Screenshot
  Write out a png corresponding to the render window.
  :param: renWin - the render window.
  :param: fn - the file name.
  :param: magnification - the magnification.
 """
 windowToImageFilter = vtk.vtkWindowToImageFilter()
 windowToImageFilter.SetInput(renWin)
 windowToImageFilter.SetMagnification(magnification)
 # Record the alpha (transparency) channel
 # windowToImageFilter.SetInputBufferTypeToRGBA()
 windowToImageFilter.SetInputBufferTypeToRGB()
 # Read from the back buffer
 windowToImageFilter.ReadFrontBufferOff()
 windowToImageFilter.Update()
 
 writer = vtk.vtkPNGWriter()
 writer.SetFileName(fn)
 writer.SetInputConnection(windowToImageFilter.GetOutputPort())
 writer.Write()
 
 
if __name__ == '__main__':
 main()

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持【听图阁-专注于Python设计】。

返回列表

上一篇：Python字符转换

下一篇：PHP生成静态页面详解

相关文章

Python实现接受任意个数参数的函数方法

这个功能倒也不是我多么急需的功能，只是恰好看到了，觉得或许以后会用的到。功能就是实现函数能够接受不同数目的参数。 其实，在C语言中这个功能是熟悉的，虽说实现的形式不太一样。C语言中的ma...

Python切片索引用法示例

本文实例讲述了Python切片索引用法。分享给大家供大家参考，具体如下： 在Python中，可以用用简单的方括号加一个下标的方式访问序列的每一个元素，这种方式称之为切片操作符，切片操作符...

python单链表实现代码实例

链表的定义：链表(linked list)是由一组被称为结点的数据元素组成的数据结构，每个结点都包含结点本身的信息和指向下一个结点的地址。由于每个结点都包含了可以链接起来的地址信息，所以...

python实现扫描ip地址的小程序

python实现扫描ip地址的小程序，具体代码如下所示： import os,time import sys start_Time=int(time.time()) ip_True...

pyqt和pyside开发图形化界面

复制代码 代码如下:#!/usr/bin/env pythonimport sysfrom PyQt4 import QtGui,QtCoreimport httplibfrom url...

© YiPeiWu.com 【宜配屋】 粤ICP备17031333号

Powered By Z-BlogPHP. Theme by TOYEAN.