如何使用Python VTK绘制线条

主要函数介绍：

vtk.vtkPoints() 在VTK中用于定义点的类，使用points.InsertPoint(index, x, y, z) 即可插入点集。函数中，第一个参数是点的序号，后面是三个参数是点的坐标。

vtk.vtkLineSource() 在VTK中定义直线的类，通过SetPoints(points),输入直线经过的点。

vtk.vtkParametricSpline() 在VTK中定义曲线的类，通过SetPoints(points),输入曲线经过的点。

vtk.vtkParametricFunctionSource() 曲线插值拟合函数，可以将输入的点集拟合成一条曲线。有很多生成方法。我们可以简单的看一下VTK官方文档介绍

S\CALAR_NONE - Scalars are not generated (default).
SCALAR_U - The scalar is set to the u-value.
SCALAR_V - The scalar is set to the v-value.
SCALAR_U0 - The scalar is set to 1 if u = (u_max - u_min)/2 = u_avg, 0 otherwise.
SCALAR_V0 - The scalar is set to 1 if v = (v_max - v_min)/2 = v_avg, 0 otherwise.
SCALAR_U0V0 - The scalar is set to 1 if u == u_avg, 2 if v == v_avg, 3 if u = u_avg && v = v_avg, 0 otherwise.
SCALAR_MODULUS - The scalar is set to (sqrt(uu+vv)), this is measured relative to (u_avg,v_avg).
SCALAR_PHASE - The scalar is set to (atan2(v,u)) (in degrees, 0 to 360), this is measured relative to (u_avg,v_avg).
SCALAR_QUADRANT - The scalar is set to 1, 2, 3 or 4. depending upon the quadrant of the point (u,v).
SCALAR_X - The scalar is set to the x-value.
SCALAR_Y - The scalar is set to the y-value.
SCALAR_Z - The scalar is set to the z-value.
SCALAR_DISTANCE - The scalar is set to (sqrt(xx+yy+z*z)). I.e. distance from the origin.
SCALAR_USER_DEFINED - The scalar is set to the value returned from EvaluateScalar().

actor.GetProperty().SetColor() 线条颜色配置

actor.GetProperty().SetLineWidth() 线条宽度配置

拟合曲线代码：

import vtk

points = vtk.vtkPoints()  # 定义一个点工具
points.InsertPoint(0, 329, 338, 45)  # 使用InsertPoint可以插入点
# 注意：points.InsertPoint(a, b, c, d)
# 其中a表示点的序号，(b,c,d)表示点的三维坐标
points.InsertPoint(1, 328, 319, 46)
points.InsertPoint(2, 300, 329, 96)
# 定义曲线工具
# 将前面的几个点插值拟合成一条曲线
spline = vtk.vtkParametricSpline()
spline.SetPoints(points)

splineSource = vtk.vtkParametricFunctionSource()
splineSource.SetParametricFunction(spline)
splineSource.Update()

splineMapper = vtk.vtkPolyDataMapper()
splineMapper.SetInputConnection(splineSource.GetOutputPort())

splineActor = vtk.vtkActor()
splineActor.SetMapper(splineMapper)
# 设置线条颜色
splineActor.GetProperty().SetColor(0.3800, 0.7000, 0.1600)
# 设置线条宽度
splineActor.GetProperty().SetLineWidth(5)

ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
ren1.AddActor(splineActor)

ren1.SetBackground(1, 1, 1)
renWin.SetSize(250, 250)
renWin.Render()
iren.Start()

绘制直线代码

import vtk

points = vtk.vtkPoints()  # 定义一个点工具
points.InsertPoint(0, 329, 338, 45)  # 使用InsertPoint可以插入点
# 注意：points.InsertPoint(a, b, c, d)
# 其中a表示点的序号，(b,c,d)表示点的三维坐标
points.InsertPoint(1, 328, 319, 46)
points.InsertPoint(2, 300, 329, 96)
# 定义直线工具

lineSource = vtk.vtkLineSource()
lineSource.SetPoints(points)

lineSource.Update()

lineMapper = vtk.vtkPolyDataMapper()
lineMapper.SetInputConnection(lineSource.GetOutputPort())

splineActor = vtk.vtkActor()
splineActor.SetMapper(lineMapper)
# 设置线条颜色
splineActor.GetProperty().SetColor(0.3800, 0.7000, 0.1600)
# 设置线条宽度
splineActor.GetProperty().SetLineWidth(5)

ren1 = vtk.vtkRenderer()
renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(ren1)
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)
ren1.AddActor(splineActor)

ren1.SetBackground(1, 1, 1)
renWin.SetSize(250, 250)
renWin.Render()
iren.Start()

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