def __init__(self):
super(TransferFunctionWidget, self).__init__()
self.nodes = []
self.lines = []
self.histogram = Histogram()
self.histogram.enabled = False
# Create a histogram widget for the background of the transfer function editor
self.histogramWidget = HistogramWidget()
self.histogramWidget.setHistogram(self.histogram)
self.histogramWidget.setAxeMode(bottom=HistogramWidget.AxeClear,
left=HistogramWidget.AxeLog)
self.histogramWidget.update()
self.histogramWidget._histogramItem.delegate = self
Style.styleWidgetForTab(self.histogramWidget)
# Invisible item that catches mouse events on top of the histogram
self.transferfunctionItem = TransferFunctionItem()
self.transferfunctionItem.setZValue(250)
self.transferfunctionItem.delegate = self
self.histogramWidget.addItem(self.transferfunctionItem)
# Create a widget for editing the selected node of the transfer function
self.nodeItemWidget = NodeItemWidget()
self.nodeItemWidget.setEnabled(False)
self.nodeItemWidget.nodeUpdated.connect(self.updateNode)
self.nodeItemWidget.removePoint.connect(self.removePoint)
layout = QGridLayout()
layout.setSpacing(0)
layout.setContentsMargins(0, 0, 0, 0)
layout.addWidget(self.histogramWidget, 0, 0)
layout.addWidget(self.nodeItemWidget, 1, 0)
self.setLayout(layout)
def __init__(self): super(TransferFunctionWidget, self).__init__() self.nodes = [] self.lines = [] self.histogram = Histogram() self.histogram.enabled = False # Create a histogram widget for the background of the transfer function editor self.histogramWidget = HistogramWidget() self.histogramWidget.setHistogram(self.histogram) self.histogramWidget.setAxeMode(bottom=HistogramWidget.AxeClear, left=HistogramWidget.AxeLog) self.histogramWidget.update() self.histogramWidget._histogramItem.delegate = self Style.styleWidgetForTab(self.histogramWidget) # Invisible item that catches mouse events on top of the histogram self.transferfunctionItem = TransferFunctionItem() self.transferfunctionItem.setZValue(250) self.transferfunctionItem.delegate = self self.histogramWidget.addItem(self.transferfunctionItem) # Create a widget for editing the selected node of the transfer function self.nodeItemWidget = NodeItemWidget() self.nodeItemWidget.setEnabled(False) self.nodeItemWidget.nodeUpdated.connect(self.updateNode) self.nodeItemWidget.removePoint.connect(self.removePoint) layout = QGridLayout() layout.setSpacing(0) layout.setContentsMargins(0, 0, 0, 0) layout.addWidget(self.histogramWidget, 0, 0) layout.addWidget(self.nodeItemWidget, 1, 0) self.setLayout(layout)
class TransferFunctionWidget(QWidget): """ TransferFunctionWidget """ valueChanged = Signal(object) def __init__(self): super(TransferFunctionWidget, self).__init__() self.nodes = [] self.lines = [] self.histogram = Histogram() self.histogram.enabled = False # Create a histogram widget for the background of the transfer function editor self.histogramWidget = HistogramWidget() self.histogramWidget.setHistogram(self.histogram) self.histogramWidget.setAxeMode(bottom=HistogramWidget.AxeClear, left=HistogramWidget.AxeLog) self.histogramWidget.update() self.histogramWidget._histogramItem.delegate = self Style.styleWidgetForTab(self.histogramWidget) # Invisible item that catches mouse events on top of the histogram self.transferfunctionItem = TransferFunctionItem() self.transferfunctionItem.setZValue(250) self.transferfunctionItem.delegate = self self.histogramWidget.addItem(self.transferfunctionItem) # Create a widget for editing the selected node of the transfer function self.nodeItemWidget = NodeItemWidget() self.nodeItemWidget.setEnabled(False) self.nodeItemWidget.nodeUpdated.connect(self.updateNode) self.nodeItemWidget.removePoint.connect(self.removePoint) layout = QGridLayout() layout.setSpacing(0) layout.setContentsMargins(0, 0, 0, 0) layout.addWidget(self.histogramWidget, 0, 0) layout.addWidget(self.nodeItemWidget, 1, 0) self.setLayout(layout) def setImageData(self, imageData): # Clear any previous nodes for node in self.nodes: self.histogramWidget.scene().removeItem(node) self.nodes = [] # Clear any previous lines for line in self.lines: self.histogramWidget.scene().removeItem(line) self.lines = [] bins = DataAnalyzer.histogramForData(imageData, 256) self.histogram.bins = bins self.histogram.enabled = True self.range = imageData.GetScalarRange() # Create and add nodes from the transfer function self.updateNodes() self.valueChanged.emit(self) def resizeEvent(self, event): self.histogramWidget.update() self.updateNodes() def updateNodes(self): for index in range(len(self.transferFunction.points)): point = self.transferFunction.points[index] if index < len(self.nodes): # Just update the node item nodeItem = self.nodes[index] else: # Create a new node item nodeItem = TransferFunctionNodeItem() nodeItem.setSceneBoundsItem(self.histogramWidget._histogramItem) nodeItem.setZValue(300) nodeItem.delegate = self self.histogramWidget.scene().addItem(nodeItem) self.nodes.append(nodeItem) nodeItem.setPosition([(point.value - self.range[0]) / (self.range[1] - self.range[0]), point.opacity]) nodeItem.updateColor(point.color) nodeItem.node = point if nodeItem.isSelected(): self.selectedNode(nodeItem) # Clean up redundant node items if len(self.nodes) > len(self.transferFunction.points): # Remove node items from scene for index in range(len(self.transferFunction.points), len(self.nodes)): nodeItem = self.nodes[index] self.histogramWidget.scene().removeItem(nodeItem) # Remove them from the nodes del self.nodes[len(self.transferFunction.points):] assert len(self.nodes) == len(self.transferFunction.points) self.updateLines() def updateLines(self): pen = QPen(QColor.fromHsl(0, 100, 100)) sortedNodes = sorted(self.nodes, key=lambda x: x.pos().x()) for index in range(len(self.nodes)-1): node = sortedNodes[index] nextNode = sortedNodes[index+1] if index < len(self.lines): # Just update the line segment lineItem = self.lines[index] else: # Create a new line segment lineItem = QGraphicsLineItem() lineItem.setZValue(250) lineItem.setPen(pen) self.histogramWidget.scene().addItem(lineItem) self.lines.append(lineItem) line = QLineF(node.pos(), nextNode.pos()) lineItem.setLine(line) # Clean up redundent lines if len(self.lines) >= len(self.nodes): # Remove the redundant line segments from the scene for index in range(len(self.nodes)-1, len(self.lines)): lineItem = self.lines[index] self.histogramWidget.scene().removeItem(lineItem) # Delete the line segments from the list del self.lines[len(self.nodes)-1:] assert len(self.lines) == len(self.nodes) - 1 self.histogramWidget._scene.update() def nodeUpdated(self, node): position = node.getPosition() index = self._indexForNode(node) self.transferFunction.updatePointAtIndex(index, position) self.nodeItemWidget.setNode(self.transferFunction.points[index]) self.updateNodes() self.valueChanged.emit(self) @Slot(object) def updateNode(self, point): index = self._indexForPoint(point) nodeItem = self.nodes[index] nodeItem.updateColor(point.color) self.transferFunction.updateTransferFunction() self.valueChanged.emit(self) def selectedNode(self, nodeItem): self.nodeItemWidget.setNode(nodeItem.node) def addNodeAtCoord(self, coord): self.transferFunction.addPointAtCoord(coord, [1, 1, 1]) self.updateNodes() self.valueChanged.emit(self) def removePoint(self, point): index = self._indexForPoint(point) self.transferFunction.removePointAtIndex(index) self.updateNodes() def unselect(self): for node in self.nodes: if node.isSelected(): node.setSelected(False) self.nodeItemWidget.setNode(None) self.updateNodes() def _indexForPoint(self, point): for index in range(len(self.transferFunction.points)): if point == self.transferFunction.points[index]: return index def _indexForNode(self, node): for index in range(len(self.nodes)): if node == self.nodes[index]: return index
class TransferFunctionWidget(QWidget):
"""
TransferFunctionWidget
"""
valueChanged = Signal(object)
def __init__(self):
super(TransferFunctionWidget, self).__init__()
self.nodes = []
self.lines = []
self.histogram = Histogram()
self.histogram.enabled = False
# Create a histogram widget for the background of the transfer function editor
self.histogramWidget = HistogramWidget()
self.histogramWidget.setHistogram(self.histogram)
self.histogramWidget.setAxeMode(bottom=HistogramWidget.AxeClear,
left=HistogramWidget.AxeLog)
self.histogramWidget.update()
self.histogramWidget._histogramItem.delegate = self
Style.styleWidgetForTab(self.histogramWidget)
# Invisible item that catches mouse events on top of the histogram
self.transferfunctionItem = TransferFunctionItem()
self.transferfunctionItem.setZValue(250)
self.transferfunctionItem.delegate = self
self.histogramWidget.addItem(self.transferfunctionItem)
# Create a widget for editing the selected node of the transfer function
self.nodeItemWidget = NodeItemWidget()
self.nodeItemWidget.setEnabled(False)
self.nodeItemWidget.nodeUpdated.connect(self.updateNode)
self.nodeItemWidget.removePoint.connect(self.removePoint)
layout = QGridLayout()
layout.setSpacing(0)
layout.setContentsMargins(0, 0, 0, 0)
layout.addWidget(self.histogramWidget, 0, 0)
layout.addWidget(self.nodeItemWidget, 1, 0)
self.setLayout(layout)
def setImageData(self, imageData):
# Clear any previous nodes
for node in self.nodes:
self.histogramWidget.scene().removeItem(node)
self.nodes = []
# Clear any previous lines
for line in self.lines:
self.histogramWidget.scene().removeItem(line)
self.lines = []
bins = DataAnalyzer.histogramForData(imageData, 256)
self.histogram.bins = bins
self.histogram.enabled = True
self.range = imageData.GetScalarRange()
# Create and add nodes from the transfer function
self.updateNodes()
self.valueChanged.emit(self)
def resizeEvent(self, event):
self.histogramWidget.update()
self.updateNodes()
def updateNodes(self):
for index in range(len(self.transferFunction.points)):
point = self.transferFunction.points[index]
if index < len(self.nodes):
# Just update the node item
nodeItem = self.nodes[index]
else:
# Create a new node item
nodeItem = TransferFunctionNodeItem()
nodeItem.setSceneBoundsItem(
self.histogramWidget._histogramItem)
nodeItem.setZValue(300)
nodeItem.delegate = self
self.histogramWidget.scene().addItem(nodeItem)
self.nodes.append(nodeItem)
nodeItem.setPosition([(point.value - self.range[0]) /
(self.range[1] - self.range[0]),
point.opacity])
nodeItem.updateColor(point.color)
nodeItem.node = point
if nodeItem.isSelected():
self.selectedNode(nodeItem)
# Clean up redundant node items
if len(self.nodes) > len(self.transferFunction.points):
# Remove node items from scene
for index in range(len(self.transferFunction.points),
len(self.nodes)):
nodeItem = self.nodes[index]
self.histogramWidget.scene().removeItem(nodeItem)
# Remove them from the nodes
del self.nodes[len(self.transferFunction.points):]
assert len(self.nodes) == len(self.transferFunction.points)
self.updateLines()
def updateLines(self):
pen = QPen(QColor.fromHsl(0, 100, 100))
sortedNodes = sorted(self.nodes, key=lambda x: x.pos().x())
for index in range(len(self.nodes) - 1):
node = sortedNodes[index]
nextNode = sortedNodes[index + 1]
if index < len(self.lines):
# Just update the line segment
lineItem = self.lines[index]
else:
# Create a new line segment
lineItem = QGraphicsLineItem()
lineItem.setZValue(250)
lineItem.setPen(pen)
self.histogramWidget.scene().addItem(lineItem)
self.lines.append(lineItem)
line = QLineF(node.pos(), nextNode.pos())
lineItem.setLine(line)
# Clean up redundent lines
if len(self.lines) >= len(self.nodes):
# Remove the redundant line segments from the scene
for index in range(len(self.nodes) - 1, len(self.lines)):
lineItem = self.lines[index]
self.histogramWidget.scene().removeItem(lineItem)
# Delete the line segments from the list
del self.lines[len(self.nodes) - 1:]
assert len(self.lines) == len(self.nodes) - 1
self.histogramWidget._scene.update()
def nodeUpdated(self, node):
position = node.getPosition()
index = self._indexForNode(node)
self.transferFunction.updatePointAtIndex(index, position)
self.nodeItemWidget.setNode(self.transferFunction.points[index])
self.updateNodes()
self.valueChanged.emit(self)
@Slot(object)
def updateNode(self, point):
index = self._indexForPoint(point)
nodeItem = self.nodes[index]
nodeItem.updateColor(point.color)
self.transferFunction.updateTransferFunction()
self.valueChanged.emit(self)
def selectedNode(self, nodeItem):
self.nodeItemWidget.setNode(nodeItem.node)
def addNodeAtCoord(self, coord):
self.transferFunction.addPointAtCoord(coord, [1, 1, 1])
self.updateNodes()
self.valueChanged.emit(self)
def removePoint(self, point):
index = self._indexForPoint(point)
self.transferFunction.removePointAtIndex(index)
self.updateNodes()
def unselect(self):
for node in self.nodes:
if node.isSelected():
node.setSelected(False)
self.nodeItemWidget.setNode(None)
self.updateNodes()
def _indexForPoint(self, point):
for index in range(len(self.transferFunction.points)):
if point == self.transferFunction.points[index]:
return index
def _indexForNode(self, node):
for index in range(len(self.nodes)):
if node == self.nodes[index]:
return index
