如何使用Python VTK繪製線條

2022-04-18 16:00:02

主要函數介紹：

vtk.vtkPoints() 在VTK中用於定義點的類，使用points.InsertPoint(index, x, y, z) 即可插入點集。函數中，第一個引數是點的序號，後面是三個引數是點的座標。

vtk.vtkLineSource() 在VTK中定義直線的類，通過SetPoints(points),輸入直線經過的點。

vtk.vtkParametricSpline() 在VTK中定義曲線的類，通過SetPoints(points),輸入曲線經過的點。

vtk.vtkParametricFunctionSource() 曲線插值擬合函數，可以將輸入的點集擬合成一條曲線。有很多生成方法。我們可以簡單的看一下VTK官方檔案介紹

SCALAR_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() 線條顏色設定

actor.GetProperty().SetLineWidth() 線條寬度設定

擬合曲線程式碼：

import vtk

points = vtk.vtkPoints()  # 定義一個點工具
points.InsertPoint(0, 329, 338, 45)  # 使用InsertPoint可以插入點
# 注意：points.InsertPoint(a, b, c, d)
# 其中a表示點的序號，(b,c,d)表示點的三維座標
points.InsertPoint(1, 328, 319, 46)
points.InsertPoint(2, 300, 329, 96)
# 定義曲線工具
# 將前面的幾個點插值擬合成一條曲線
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)
# 設定線條顏色
splineActor.GetProperty().SetColor(0.3800, 0.7000, 0.1600)
# 設定線條寬度
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()

繪製直執行緒式碼

import vtk

points = vtk.vtkPoints()  # 定義一個點工具
points.InsertPoint(0, 329, 338, 45)  # 使用InsertPoint可以插入點
# 注意：points.InsertPoint(a, b, c, d)
# 其中a表示點的序號，(b,c,d)表示點的三維座標
points.InsertPoint(1, 328, 319, 46)
points.InsertPoint(2, 300, 329, 96)
# 定義直線工具

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

lineSource.Update()

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

splineActor = vtk.vtkActor()
splineActor.SetMapper(lineMapper)
# 設定線條顏色
splineActor.GetProperty().SetColor(0.3800, 0.7000, 0.1600)
# 設定線條寬度
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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如何使用Python VTK繪製線條

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