def paintEvent(self, event):
option = QStyleOption()
option.initFrom(self)
contents_rect = self.style().subElementRect(QStyle.SE_FrameContents, option, self) or self.contentsRect() # the SE_FrameContents rect is Null unless the stylesheet defines decorations
if self.graphStyle == self.BarStyle:
graph_width = self.__dict__['graph_width'] = int(ceil(float(contents_rect.width()) / self.horizontalPixelsPerUnit))
else:
graph_width = self.__dict__['graph_width'] = int(ceil(float(contents_rect.width() - 1) / self.horizontalPixelsPerUnit) + 1)
max_value = self.__dict__['max_value'] = max(chain([0], *(islice(reversed(graph.data), graph_width) for graph in self.graphs if graph.enabled)))
if self.graphHeight == self.AutomaticHeight or self.graphHeight < 0:
graph_height = self.__dict__['graph_height'] = max(self.scaler.get_height(max_value), self.minHeight)
else:
graph_height = self.__dict__['graph_height'] = max(self.graphHeight, self.minHeight)
if self.graphStyle == self.BarStyle:
height_scaling = float(contents_rect.height()) / graph_height
else:
height_scaling = float(contents_rect.height() - self.lineThickness) / graph_height
painter = QStylePainter(self)
painter.drawPrimitive(QStyle.PE_Widget, option)
painter.setClipRect(contents_rect)
painter.save()
painter.translate(contents_rect.x() + contents_rect.width() - 1, contents_rect.y() + contents_rect.height() - 1)
painter.scale(-1, -1)
painter.setRenderHint(QStylePainter.Antialiasing, self.graphStyle != self.BarStyle)
for graph in (graph for graph in self.graphs if graph.enabled and graph.data):
if self.boundary is not None and 0 < self.boundary < graph_height:
boundary_width = min(5.0/height_scaling, self.boundary-0, graph_height-self.boundary)
pen_color = QLinearGradient(0, (self.boundary - boundary_width) * height_scaling, 0, (self.boundary + boundary_width) * height_scaling)
pen_color.setColorAt(0, graph.color)
pen_color.setColorAt(1, graph.over_boundary_color)
brush_color = QLinearGradient(0, (self.boundary - boundary_width) * height_scaling, 0, (self.boundary + boundary_width) * height_scaling)
brush_color.setColorAt(0, self.color_with_alpha(graph.color, self.fillTransparency))
brush_color.setColorAt(1, self.color_with_alpha(graph.over_boundary_color, self.fillTransparency))
else:
pen_color = graph.color
brush_color = self.color_with_alpha(graph.color, self.fillTransparency)
dataset = islice(reversed(graph.data), graph_width)
if self.graphStyle == self.BarStyle:
lines = [QLine(x*self.horizontalPixelsPerUnit, 0, x*self.horizontalPixelsPerUnit, y*height_scaling) for x, y in enumerate(dataset)]
painter.setPen(QPen(pen_color, self.lineThickness))
painter.drawLines(lines)
else:
painter.translate(0, +self.lineThickness/2 - 1)
if self.smoothEnvelope and self.smoothFactor > 0:
min_value = 0
max_value = graph_height * height_scaling
cx_offset = self.horizontalPixelsPerUnit / 3.0
smoothness = self.smoothFactor
last_values = deque(3*[dataset.next() * height_scaling], maxlen=3) # last 3 values: 0 last, 1 previous, 2 previous previous
envelope = QPainterPath()
envelope.moveTo(0, last_values[0])
for x, y in enumerate(dataset, 1):
x = x * self.horizontalPixelsPerUnit
y = y * height_scaling * (1 - smoothness) + last_values[0] * smoothness
last_values.appendleft(y)
c1x = x - cx_offset * 2
c2x = x - cx_offset
c1y = limit((1 + smoothness) * last_values[1] - smoothness * last_values[2], min_value, max_value) # same gradient as previous previous value to previous value
c2y = limit((1 - smoothness) * last_values[0] + smoothness * last_values[1], min_value, max_value) # same gradient as previous value to last value
envelope.cubicTo(c1x, c1y, c2x, c2y, x, y)
else:
envelope = QPainterPath()
envelope.addPolygon(QPolygonF([QPointF(x*self.horizontalPixelsPerUnit, y*height_scaling) for x, y in enumerate(dataset)]))
if self.fillEnvelope or graph.fill_envelope:
first_element = envelope.elementAt(0)
last_element = envelope.elementAt(envelope.elementCount() - 1)
fill_path = QPainterPath()
fill_path.moveTo(last_element.x, last_element.y)
fill_path.lineTo(last_element.x + 1, last_element.y)
fill_path.lineTo(last_element.x + 1, -self.lineThickness)
fill_path.lineTo(-self.lineThickness, -self.lineThickness)
fill_path.lineTo(-self.lineThickness, first_element.y)
fill_path.connectPath(envelope)
painter.fillPath(fill_path, brush_color)
painter.strokePath(envelope, QPen(pen_color, self.lineThickness, join=Qt.RoundJoin))
painter.translate(0, -self.lineThickness/2 + 1)
if self.boundary is not None and self.boundaryColor:
painter.setRenderHint(QStylePainter.Antialiasing, False)
painter.setPen(QPen(self.boundaryColor, 1.0))
painter.drawLine(0, self.boundary*height_scaling, contents_rect.width(), self.boundary*height_scaling)
painter.restore()
# queue the 'updated' signal to be emited after returning to the main loop
QMetaObject.invokeMethod(self, 'updated', Qt.QueuedConnection)
def paintEvent(self, event):
option = QStyleOption()
option.initFrom(self)
contents_rect = self.style().subElementRect(QStyle.SE_FrameContents, option, self) or self.contentsRect() # the SE_FrameContents rect is Null unless the stylesheet defines decorations
if self.graphStyle == self.BarStyle:
graph_width = self.__dict__['graph_width'] = int(ceil(float(contents_rect.width()) / self.horizontalPixelsPerUnit))
else:
graph_width = self.__dict__['graph_width'] = int(ceil(float(contents_rect.width() - 1) / self.horizontalPixelsPerUnit) + 1)
max_value = self.__dict__['max_value'] = max(chain([0], *(islice(reversed(graph.data), graph_width) for graph in self.graphs if graph.enabled)))
if self.graphHeight == self.AutomaticHeight or self.graphHeight < 0:
graph_height = self.__dict__['graph_height'] = max(self.scaler.get_height(max_value), self.minHeight)
else:
graph_height = self.__dict__['graph_height'] = max(self.graphHeight, self.minHeight)
if self.graphStyle == self.BarStyle:
height_scaling = float(contents_rect.height()) / graph_height
else:
height_scaling = float(contents_rect.height() - self.lineThickness) / graph_height
painter = QStylePainter(self)
painter.drawPrimitive(QStyle.PE_Widget, option)
painter.setClipRect(contents_rect)
painter.save()
painter.translate(contents_rect.x() + contents_rect.width() - 1, contents_rect.y() + contents_rect.height() - 1)
painter.scale(-1, -1)
painter.setRenderHint(QStylePainter.Antialiasing, self.graphStyle != self.BarStyle)
for graph in (graph for graph in self.graphs if graph.enabled and graph.data):
if self.boundary is not None and 0 < self.boundary < graph_height:
boundary_width = min(5.0/height_scaling, self.boundary-0, graph_height-self.boundary)
pen_color = QLinearGradient(0, (self.boundary - boundary_width) * height_scaling, 0, (self.boundary + boundary_width) * height_scaling)
pen_color.setColorAt(0, graph.color)
pen_color.setColorAt(1, graph.over_boundary_color)
brush_color = QLinearGradient(0, (self.boundary - boundary_width) * height_scaling, 0, (self.boundary + boundary_width) * height_scaling)
brush_color.setColorAt(0, self.color_with_alpha(graph.color, self.fillTransparency))
brush_color.setColorAt(1, self.color_with_alpha(graph.over_boundary_color, self.fillTransparency))
else:
pen_color = graph.color
brush_color = self.color_with_alpha(graph.color, self.fillTransparency)
dataset = islice(reversed(graph.data), graph_width)
if self.graphStyle == self.BarStyle:
lines = [QLine(x*self.horizontalPixelsPerUnit, 0, x*self.horizontalPixelsPerUnit, y*height_scaling) for x, y in enumerate(dataset)]
painter.setPen(QPen(pen_color, self.lineThickness))
painter.drawLines(lines)
else:
painter.translate(0, +self.lineThickness/2 - 1)
if self.smoothEnvelope and self.smoothFactor > 0:
min_value = 0
max_value = graph_height * height_scaling
cx_offset = self.horizontalPixelsPerUnit / 3.0
smoothness = self.smoothFactor
last_values = deque(3*[dataset.next() * height_scaling], maxlen=3) # last 3 values: 0 last, 1 previous, 2 previous previous
envelope = QPainterPath()
envelope.moveTo(0, last_values[0])
for x, y in enumerate(dataset, 1):
x = x * self.horizontalPixelsPerUnit
y = y * height_scaling * (1 - smoothness) + last_values[0] * smoothness
last_values.appendleft(y)
c1x = x - cx_offset * 2
c2x = x - cx_offset
c1y = limit((1 + smoothness) * last_values[1] - smoothness * last_values[2], min_value, max_value) # same gradient as previous previous value to previous value
c2y = limit((1 - smoothness) * last_values[0] + smoothness * last_values[1], min_value, max_value) # same gradient as previous value to last value
envelope.cubicTo(c1x, c1y, c2x, c2y, x, y)
else:
envelope = QPainterPath()
envelope.addPolygon(QPolygonF([QPointF(x*self.horizontalPixelsPerUnit, y*height_scaling) for x, y in enumerate(dataset)]))
if self.fillEnvelope or graph.fill_envelope:
first_element = envelope.elementAt(0)
last_element = envelope.elementAt(envelope.elementCount() - 1)
fill_path = QPainterPath()
fill_path.moveTo(last_element.x, last_element.y)
fill_path.lineTo(last_element.x + 1, last_element.y)
fill_path.lineTo(last_element.x + 1, -self.lineThickness)
fill_path.lineTo(-self.lineThickness, -self.lineThickness)
fill_path.lineTo(-self.lineThickness, first_element.y)
fill_path.connectPath(envelope)
painter.fillPath(fill_path, brush_color)
painter.strokePath(envelope, QPen(pen_color, self.lineThickness, join=Qt.RoundJoin))
painter.translate(0, -self.lineThickness/2 + 1)
if self.boundary is not None and self.boundaryColor:
painter.setRenderHint(QStylePainter.Antialiasing, False)
painter.setPen(QPen(self.boundaryColor, 1.0))
painter.drawLine(0, self.boundary*height_scaling, contents_rect.width(), self.boundary*height_scaling)
painter.restore()
# queue the 'updated' signal to be emited after returning to the main loop
QMetaObject.invokeMethod(self, 'updated', Qt.QueuedConnection)