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#!/usr/bin/env python
import sys
import vtk
from vtk.util.misc import vtkGetDataRoot
VTK_DATA_ROOT = vtkGetDataRoot()
def affine(val, inmin, inmax, outmin, outmax):
return (((val - inmin) / (inmax - inmin)) * (outmax - outmin)) + outmin
def buildSpiralPolyDataItem(drawOpts):
xmin, xmax, ymin, ymax = drawOpts['vp']
color = drawOpts['color']
lineWidth = drawOpts['lineWidth']
stippleType = drawOpts['stippleType']
spiralPoints = [
[0.1, 0.1],
[0.1, 0.9],
[0.9, 0.9],
[0.9, 0.2],
[0.2, 0.2],
[0.2, 0.8],
[0.8, 0.8],
[0.8, 0.3],
[0.3, 0.3],
[0.3, 0.7],
[0.7, 0.7],
[0.7, 0.4],
[0.4, 0.4],
[0.4, 0.6],
[0.6, 0.6],
[0.6, 0.5]
]
xformedPoints = [[
affine(p[0], 0.0, 1.0, xmin, xmax),
affine(p[1], 0.0, 1.0, ymin, ymax),
0.0
] for p in spiralPoints]
pd = vtk.vtkPolyData()
pd.Allocate(50)
pts = vtk.vtkPoints()
for pt in xformedPoints:
pts.InsertNextPoint(pt)
pd.SetPoints(pts)
numpts = len(xformedPoints)
pd.InsertNextCell(vtk.VTK_POLY_LINE, numpts, [idx for idx in range(numpts)])
colors = vtk.vtkUnsignedCharArray()
colors.SetNumberOfComponents(4)
colors.SetNumberOfTuples(1)
colors.SetTuple4(0, color[0], color[1], color[2], 255)
# Specify line width
floatValue = vtk.vtkFloatArray()
floatValue.SetNumberOfComponents(1)
floatValue.SetName("LineWidth")
floatValue.InsertNextValue(lineWidth)
pd.GetFieldData().AddArray(floatValue)
# Specify stipple pattern
intValue = vtk.vtkIntArray()
intValue.SetNumberOfComponents(1)
intValue.SetName("StippleType")
intValue.InsertNextValue(stippleType)
pd.GetFieldData().AddArray(intValue)
item = vtk.vtkPolyDataItem()
item.SetPolyData(pd)
item.SetMappedColors(colors)
item.SetScalarMode(vtk.VTK_SCALAR_MODE_USE_CELL_DATA)
item.SetVisible(True)
return item
polyDataItemList = [
buildSpiralPolyDataItem({
'vp': [0.0, 0.5, 0.0, 0.5],
'color': [255, 0, 0],
'lineWidth': 3.5,
'stippleType': vtk.vtkPen.DASH_DOT_DOT_LINE
}),
buildSpiralPolyDataItem({
'vp': [0.0, 0.5, 0.5, 1.0],
'color': [0, 255, 0],
'lineWidth': 2.5,
'stippleType': vtk.vtkPen.DASH_LINE
}),
buildSpiralPolyDataItem({
'vp': [0.5, 1.0, 0.5, 1.0],
'color': [0, 0, 255],
'lineWidth': 1.5,
'stippleType': vtk.vtkPen.DASH_DOT_LINE
}),
buildSpiralPolyDataItem({
'vp': [0.5, 1.0, 0.0, 0.5],
'color': [255, 0, 255],
'lineWidth': 0.5,
'stippleType': vtk.vtkPen.SOLID_LINE
})
]
width = 400
height = 400
view = vtk.vtkContextView()
renWin = view.GetRenderWindow()
renWin.SetSize(width, height)
area = vtk.vtkInteractiveArea()
view.GetScene().AddItem(area)
drawAreaBounds = vtk.vtkRectd(0.0, 0.0, 1.0, 1.0)
vp = [0.0, 1.0, 0.0, 1.0]
screenGeometry = vtk.vtkRecti(int(vp[0] * width),
int(vp[2] * height),
int((vp[1] - vp[0]) * width),
int((vp[3] - vp[2]) * height))
for item in polyDataItemList:
area.GetDrawAreaItem().AddItem(item)
area.SetDrawAreaBounds(drawAreaBounds)
area.SetGeometry(screenGeometry)
area.SetFillViewport(False)
area.SetShowGrid(False)
axisLeft = area.GetAxis(vtk.vtkAxis.LEFT)
axisRight = area.GetAxis(vtk.vtkAxis.RIGHT)
axisBottom = area.GetAxis(vtk.vtkAxis.BOTTOM)
axisTop = area.GetAxis(vtk.vtkAxis.TOP)
axisTop.SetVisible(False)
axisRight.SetVisible(False)
axisLeft.SetVisible(False)
axisBottom.SetVisible(False)
axisTop.SetMargins(0, 0)
axisRight.SetMargins(0, 0)
axisLeft.SetMargins(0, 0)
axisBottom.SetMargins(0, 0)
renWin.Render()
# iren = view.GetInteractor()
# iren.Initialize()
# iren.GetInteractorStyle().SetCurrentRenderer(view.GetRenderer());
# iren.Start()
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