Python Grid使用和布局詳解
更新時(shí)間：2018年06月30日 08:37:07 作者：genispan
這篇文章主要為大家詳細(xì)介紹了Python Grid使用和布局，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下
本文實(shí)例為大家分享了Python Grid使用和布局的具體代碼，供大家參考，具體內(nèi)容如下
#!/usr/bin/env python
import vtk
# 這個(gè)示例主要用于將不同的圖像對(duì)象顯示到指定的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.
# 為每個(gè)獨(dú)立的文本圖形對(duì)象創(chuàng)建獨(dú)立的Mapper和Actors，并綁定至每個(gè)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)
# 渲染圖形對(duì)象至不同的顯示區(qū)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?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。
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