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#!/usr/bin/env python
from vtkmodules.vtkCommonCore import (
vtkIntArray,
vtkPoints,
)
from vtkmodules.vtkCommonDataModel import (
vtkPath,
)
from vtkmodules.vtkViewsContext2D import (
vtkContextView,
)
from vtkmodules.vtkRenderingContext2D import (
vtkContext2D,
vtkContextItem,
vtkContextScene,
vtkPen,
)
from vtkmodules.vtkRenderingCore import (
vtkRenderer,
vtkRenderWindow,
vtkRenderWindowInteractor,
vtkTextProperty,
)
from vtkmodules.vtkRenderingFreeType import (
vtkMathTextUtilities,
)
from vtkmodules.vtkPythonContext2D import (
vtkPythonItem,
)
import vtkmodules.vtkRenderingContextOpenGL2
import vtkmodules.vtkRenderingMatplotlib
import vtkmodules.vtkRenderingOpenGL2
import vtkmodules.vtkRenderingUI
#------------------------------------------------------------------------------
class StringToPathContextTest(object):
def __init__(self):
self.Path = None
def SetPath(self, path):
self.Path = path
def Initialize(self, vtkSelf):
return True
def Paint(self, vtkSelf, painter):
# Paint event for the chart, called whenever the chart needs to be drawn
# This function aims to test the primitives provided by the 2D API.
# RGB color lookup table by path point code:
color = [(), (), (), ()]
color[vtkPath.MOVE_TO] = (1.0, 0.0, 0.0)
color[vtkPath.LINE_TO] = (0.0, 1.0, 0.0)
color[vtkPath.CONIC_CURVE] = (0.0, 0.0, 1.0)
color[vtkPath.CUBIC_CURVE] = (1.0, 0.0, 1.0)
points = self.Path.GetPoints()
codes = self.Path.GetCodes()
if points.GetNumberOfPoints() != codes.GetNumberOfTuples():
return False
# scaling factor and offset to ensure that the points will fit the view:
scale = 5.16591
offset = 20.0
# Draw the control points, colored by codes:
point = [0.0, 0.0, 0.0]
painter.GetPen().SetWidth(2)
for i in range(points.GetNumberOfPoints()):
points.GetPoint(i, point)
code = codes.GetValue(i)
painter.GetPen().SetColorF(color[code])
painter.DrawPoint(point[0] * scale + offset, point[1] * scale + offset)
return True
#------------------------------------------------------------------------------
# Set up a 2D context view, context test object and add it to the scene
view = vtkContextView()
ren = view.GetRenderer()
ren.SetBackground(1.0, 1.0, 1.0)
renWin = view.GetRenderWindow()
renWin.SetSize(325, 150)
test = vtkPythonItem()
testObject = StringToPathContextTest()
test.SetPythonObject(testObject)
view.GetScene().AddItem(test)
path = vtkPath()
tprop = vtkTextProperty()
vtkMathTextUtilities.GetInstance().StringToPath(
"$\\frac{-b\\pm\\sqrt{b^2-4ac}}{2a}$", path, tprop, view.GetRenderWindow().GetDPI())
testObject.SetPath(path)
renWin.SetMultiSamples(0)
iren = view.GetInteractor()
iren.Initialize()
if 'rtTester' not in locals() or rtTester.IsInteractiveModeSpecified():
iren.Start()
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