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04_connect_pick_events.py
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04_connect_pick_events.py
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from __future__ import print_function
import os
import vtk
from vtk.qt4.QVTKRenderWindowInteractor import QVTKRenderWindowInteractor
from PyQt4 import QtCore, QtGui, uic
class GlyphViewerApp(QtGui.QMainWindow):
def __init__(self, data_dir):
#Parent constructor
super(GlyphViewerApp,self).__init__()
self.vtk_widget = None
self.ui = None
self.setup(data_dir)
def setup(self, data_dir):
import glyph_ui
self.ui = glyph_ui.Ui_MainWindow()
self.ui.setupUi(self)
self.vtk_widget = QGlyphViewer(self.ui.vtk_panel, data_dir)
self.ui.vtk_layout = QtGui.QHBoxLayout()
self.ui.vtk_layout.addWidget(self.vtk_widget)
self.ui.vtk_layout.setContentsMargins(0,0,0,0)
self.ui.vtk_panel.setLayout(self.ui.vtk_layout)
self.ui.threshold_slider.setValue(50)
self.ui.threshold_slider.valueChanged.connect(self.vtk_widget.set_threshold)
self.vtk_widget.arrow_picked.connect(self.update_magnitude)
def initialize(self):
self.vtk_widget.start()
def update_magnitude(self, magnitude):
print(magnitude)
self.ui.vector_size.setText("%.2f"%magnitude)
class QGlyphViewer(QtGui.QFrame):
arrow_picked = QtCore.pyqtSignal(float)
def __init__(self, parent, data_dir):
super(QGlyphViewer,self).__init__(parent)
# Make tha actual QtWidget a child so that it can be re parented
interactor = QVTKRenderWindowInteractor(self)
self.layout = QtGui.QHBoxLayout()
self.layout.addWidget(interactor)
self.layout.setContentsMargins(0,0,0,0)
self.setLayout(self.layout)
# Read the data
xyx_file = os.path.join(data_dir, "combxyz.bin")
q_file = os.path.join(data_dir, "combq.bin")
pl3d = vtk.vtkMultiBlockPLOT3DReader()
pl3d.SetXYZFileName(xyx_file)
pl3d.SetQFileName(q_file)
pl3d.SetScalarFunctionNumber(100)
pl3d.SetVectorFunctionNumber(202)
pl3d.Update()
blocks = pl3d.GetOutput()
b0 = blocks.GetBlock(0)
# Setup VTK environment
renderer = vtk.vtkRenderer()
render_window = interactor.GetRenderWindow()
render_window.AddRenderer(renderer)
interactor.SetInteractorStyle(vtk.vtkInteractorStyleTrackballCamera())
render_window.SetInteractor(interactor)
renderer.SetBackground(0.2,0.2,0.2)
# Draw Outline
outline = vtk.vtkStructuredGridOutlineFilter()
outline.SetInputData(b0)
outline_mapper = vtk.vtkPolyDataMapper()
outline_mapper.SetInputConnection(outline.GetOutputPort())
outline_actor = vtk.vtkActor()
outline_actor.SetMapper(outline_mapper)
outline_actor.GetProperty().SetColor(1,1,1)
renderer.AddActor(outline_actor)
renderer.ResetCamera()
# Draw Outline
outline = vtk.vtkStructuredGridOutlineFilter()
outline.SetInputData(b0)
outline_mapper = vtk.vtkPolyDataMapper()
outline_mapper.SetInputConnection(outline.GetOutputPort())
outline_actor = vtk.vtkActor()
outline_actor.SetMapper(outline_mapper)
outline_actor.GetProperty().SetColor(1,1,1)
renderer.AddActor(outline_actor)
renderer.ResetCamera()
# Threshold points
threshold = vtk.vtkThresholdPoints()
threshold.SetInputData(b0)
threshold.ThresholdByUpper(0.5)
# Draw arrows
arrow = vtk.vtkArrowSource()
glyphs = vtk.vtkGlyph3D()
glyphs.SetInputData(b0)
glyphs.SetSourceConnection(arrow.GetOutputPort())
glyphs.SetInputConnection(threshold.GetOutputPort())
glyphs.SetVectorModeToUseVector()
glyphs.SetScaleModeToScaleByVector()
glyphs.SetScaleFactor(0.005)
glyphs.SetColorModeToColorByVector()
# Mapper
glyph_mapper = vtk.vtkPolyDataMapper()
glyph_mapper.SetInputConnection(glyphs.GetOutputPort())
glyph_actor = vtk.vtkActor()
glyph_actor.SetMapper(glyph_mapper)
glyph_mapper.UseLookupTableScalarRangeOn()
renderer.AddActor(glyph_actor)
# Set color lookuptable
glyphs.Update()
s0,sf = glyphs.GetOutput().GetScalarRange()
lut = vtk.vtkColorTransferFunction()
lut.AddRGBPoint(s0, 1,0,0)
lut.AddRGBPoint(sf, 0,1,0)
glyph_mapper.SetLookupTable(lut)
# Register pick listener
self.b0 = b0
self.renderer = renderer
self.interactor = interactor
self.threshold = threshold
self.render_window = render_window
self.picker = vtk.vtkCellPicker()
self.picker.AddObserver("EndPickEvent", self.process_pick)
self.interactor.SetPicker(self.picker)
self.glyphs=glyphs
def start(self):
self.interactor.Initialize()
self.interactor.Start()
self.interactor.AddObserver(vtk.vtkCommand.LeftButtonPressEvent, self.click_to_pick, 10)
def set_threshold(self, new_value):
float_value = new_value/100.0
print(float_value)
self.threshold.ThresholdByUpper(float_value)
self.render_window.Render()
def process_pick(self, object, event):
point_id = object.GetPointId()
if point_id >= 0:
vector_magnitude = self.glyphs.GetOutput().GetPointData().GetScalars().GetTuple(point_id)
self.arrow_picked.emit(vector_magnitude[0])
def click_to_pick(self, object, event):
x, y = object.GetEventPosition()
self.picker.Pick(x,y,0, self.renderer)
if __name__ == "__main__":
os.chdir(os.path.dirname(__file__))
# Recompile ui
with open("glyph_view.ui") as ui_file:
with open("glyph_ui.py","w") as py_ui_file:
uic.compileUi(ui_file,py_ui_file)
app = QtGui.QApplication([])
main_window = GlyphViewerApp("volume")
main_window.show()
main_window.initialize()
app.exec_()