def updatePaintNode(self, old_node, _):
if not old_node:
self.node = QSGGeometryNode()
geometry = QSGGeometry(QSGGeometry.defaultAttributes_Point2D(),
self.m_segment_count)
geometry.setLineWidth(2)
geometry.setDrawingMode(QSGGeometry.DrawLineStrip)
self.node.setGeometry(geometry)
self.node.setFlag(QSGNode.OwnsGeometry)
material = QSGFlatColorMaterial()
material.setColor(QColor(255, 0, 0))
self.node.setMaterial(material)
self.node.setFlag(QSGNode.OwnsMaterial)
else:
geometry = self.node.geometry()
geometry.allocate(self.m_segment_count)
w = self.width()
h = self.height()
vertices = geometry.vertexDataAsPoint2D()
for i in range(self.m_segment_count):
t = i / (self.m_segment_count - 1)
invt = 1 - t
pos = invt * invt * invt * self.m_p1 \
+ 3 * invt * invt * t * self.m_p2 \
+ 3 * invt * t * t * self.m_p3 \
+ t * t * t * self.m_p4
vertices[i].set(pos.x() * w, pos.y() * h)
self.node.markDirty(QSGNode.DirtyGeometry)
return self.node
def updatePaintNode(self, oldNode: QSGGeometryNode, _):
if oldNode == None:
node = QSGGeometryNode()
geometry = QSGGeometry(QSGGeometry.defaultAttributes_Point2D(), self._segment_count)
geometry.setLineWidth(3)
geometry.setDrawingMode(QSGGeometry.DrawLineStrip)
node.setGeometry(geometry)
node.setFlag(QSGNode.OwnsGeometry)
material = QSGFlatColorMaterial()
material.setColor(QColor(45, 100, 120))
node.setMaterial(material)
node.setFlag(QSGNode.OwnsMaterial)
else:
node = oldNode
geometry = node.geometry()
geometry.allocate(self._segment_count)
itemSize = self.size()
vertices = geometry.vertexDataAsPoint2D()
x1 = self._p1.x()
y1 = self._p1.y()
vertices[0].set(x1, y1)
x2 = self._p2.x()
y2 = self._p2.y()
vertices[1].set(x2, y2)
print(vertices[1].x)
node.markDirty(QSGNode.DirtyGeometry)
return node
def updatePaintNode(self, oldNode, nodeData):
if self._root_node is None:
self._root_node = QSGGeometryNode()
geometry = QSGGeometry(
QSGGeometry.defaultAttributes_Point2D(), self._segmentCount
)
geometry.setLineWidth(2)
geometry.setDrawingMode(QSGGeometry.GL_LINE_STRIP)
self._root_node.setGeometry(geometry)
self._root_node.setFlag(QSGNode.OwnsGeometry)
material = QSGFlatColorMaterial()
material.setColor(QColor(255, 0, 0))
self._root_node.setMaterial(material)
self._root_node.setFlag(QSGNode.OwnsMaterial)
else:
geometry = self._root_node.geometry()
geometry.allocate(self._segmentCount)
w = self.width()
h = self.height()
vertices = geometry.vertexDataAsPoint2D()
for i in range(self._segmentCount):
t = i / float(self._segmentCount - 1)
invt = 1 - t
pos = (
invt * invt * invt * self._p1
+ 3 * invt * invt * t * self._p2
+ 3 * invt * t * t * self._p3
+ t * t * t * self._p4
)
vertices[i].set(pos.x() * w, pos.y() * h)
self._root_node.markDirty(QSGNode.DirtyGeometry)
return self._root_node
def updatePaintNode(self, oldNode, nodeData):
if self._root_node is None:
self._root_node = QSGGeometryNode()
geometry = QSGGeometry(QSGGeometry.defaultAttributes_Point2D(),
self._segmentCount)
geometry.setLineWidth(2)
geometry.setDrawingMode(QSGGeometry.GL_LINE_STRIP)
self._root_node.setGeometry(geometry)
self._root_node.setFlag(QSGNode.OwnsGeometry)
material = QSGFlatColorMaterial()
material.setColor(QColor(255, 0, 0))
self._root_node.setMaterial(material)
self._root_node.setFlag(QSGNode.OwnsMaterial)
else:
geometry = self._root_node.geometry()
geometry.allocate(self._segmentCount)
w = self.width()
h = self.height()
vertices = geometry.vertexDataAsPoint2D()
for i in range(self._segmentCount):
t = i / float(self._segmentCount - 1)
invt = 1 - t
pos = invt * invt * invt * self._p1 \
+ 3 * invt * invt * t * self._p2 \
+ 3 * invt * t * t * self._p3 \
+ t * t * t * self._p4
vertices[i].set(pos.x() * w, pos.y() * h)
self._root_node.markDirty(QSGNode.DirtyGeometry)
return self._root_node