def legendIcon(self, index, size):
"""
:param int index: Index of the legend entry (ignored as there is only one)
:param QSizeF size: Icon size
:return: Icon representing the marker on the legend
.. seealso::
:py:meth:`qwt.plot.QwtPlotItem.setLegendIconSize()`,
:py:meth:`qwt.plot.QwtPlotItem.legendData()`
"""
if size.isEmpty():
return QwtGraphic()
icon = QwtGraphic()
icon.setDefaultSize(size)
icon.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(icon)
painter.setRenderHint(QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.style != QwtPlotMarker.NoLine:
painter.setPen(self.__data.pen)
if self.__data.style in (QwtPlotMarker.HLine, QwtPlotMarker.Cross):
y = .5*size.height()
painter.drawLine(0., y, size.width(), y)
if self.__data.style in (QwtPlotMarker.VLine, QwtPlotMarker.Cross):
x = .5*size.width()
painter.drawLine(x, 0., x, size.height())
if self.__data.symbol:
r = QRect(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return icon
def drawColorBar(self, painter, colorMap, interval, scaleMap, orientation,
rect):
colorTable = []
if colorMap.format() == QwtColorMap.Indexed:
colorTable = colorMap.colorTable(interval)
c = QColor()
devRect = rect.toAlignedRect()
pixmap = QPixmap(devRect.size())
pixmap.fill(Qt.transparent)
pmPainter = QPainter(pixmap)
pmPainter.translate(-devRect.x(), -devRect.y())
if orientation == Qt.Horizontal:
sMap = scaleMap
sMap.setPaintInterval(rect.left(), rect.right())
for x in range(devRect.left(), devRect.right() + 1):
value = sMap.invTransform(x)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(x, devRect.top(), devRect.bottom())
else:
sMap = scaleMap
sMap.setPaintInterval(rect.bottom(), rect.top())
for y in range(devRect.top(), devRect.bottom() + 1):
value = sMap.invTransform(y)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(devRect.left(), y, devRect.right(), y)
pmPainter.end()
self.drawPixmap(painter, rect, pixmap)
def legendIcon(self, index, size):
if size.isEmpty():
return QwtGraphic()
graphic = QwtGraphic()
graphic.setDefaultSize(size)
graphic.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(graphic)
painter.setRenderHint(QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.legendAttributes == 0 or\
(self.__data.legendAttributes & QwtPlotCurve.LegendShowBrush):
brush = self.__data.brush
if brush.style() == Qt.NoBrush and self.__data.legendAttributes == 0:
if self.style() != QwtPlotCurve.NoCurve:
brush = QBrush(self.pen().color())
elif self.__data.symbol and\
self.__data.symbol.style() != QwtSymbol.NoSymbol:
brush = QBrush(self.__data.symbol.pen().color())
if brush.style() != Qt.NoBrush:
r = QRectF(0, 0, size.width(), size.height())
painter.fillRect(r, brush)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowLine:
if self.pen() != Qt.NoPen:
pn = self.pen()
# pn.setCapStyle(Qt.FlatCap)
painter.setPen(pn)
y = .5*size.height()
QwtPainter.drawLine(painter, 0., y, size.width(), y)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowSymbol:
if self.__data.symbol:
r = QRectF(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return graphic
def legendIcon(self, index, size):
"""
:param int index: Index of the legend entry (ignored as there is only one)
:param QSizeF size: Icon size
:return: Icon representing the marker on the legend
.. seealso::
:py:meth:`qwt.plot.QwtPlotItem.setLegendIconSize()`,
:py:meth:`qwt.plot.QwtPlotItem.legendData()`
"""
if size.isEmpty():
return QwtGraphic()
icon = QwtGraphic()
icon.setDefaultSize(size)
icon.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(icon)
painter.setRenderHint(
QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.style != QwtPlotMarker.NoLine:
painter.setPen(self.__data.pen)
if self.__data.style in (QwtPlotMarker.HLine, QwtPlotMarker.Cross):
y = .5 * size.height()
painter.drawLine(0., y, size.width(), y)
if self.__data.style in (QwtPlotMarker.VLine, QwtPlotMarker.Cross):
x = .5 * size.width()
painter.drawLine(x, 0., x, size.height())
if self.__data.symbol:
r = QRect(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return icon
def legendIcon(self, index, size):
if size.isEmpty():
return QwtGraphic()
graphic = QwtGraphic()
graphic.setDefaultSize(size)
graphic.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(graphic)
painter.setRenderHint(
QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.legendAttributes == 0 or\
(self.__data.legendAttributes & QwtPlotCurve.LegendShowBrush):
brush = self.__data.brush
if brush.style(
) == Qt.NoBrush and self.__data.legendAttributes == 0:
if self.style() != QwtPlotCurve.NoCurve:
brush = QBrush(self.pen().color())
elif self.__data.symbol and\
self.__data.symbol.style() != QwtSymbol.NoSymbol:
brush = QBrush(self.__data.symbol.pen().color())
if brush.style() != Qt.NoBrush:
r = QRectF(0, 0, size.width(), size.height())
painter.fillRect(r, brush)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowLine:
if self.pen() != Qt.NoPen:
pn = self.pen()
# pn.setCapStyle(Qt.FlatCap)
painter.setPen(pn)
y = .5 * size.height()
QwtPainter.drawLine(painter, 0., y, size.width(), y)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowSymbol:
if self.__data.symbol:
r = QRectF(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return graphic
def drawColorBar(self, painter, colorMap, interval, scaleMap,
orientation, rect):
colorTable = []
if colorMap.format() == QwtColorMap.Indexed:
colorTable = colorMap.colorTable(interval)
c = QColor()
devRect = rect.toAlignedRect()
pixmap = QPixmap(devRect.size())
pixmap.fill(Qt.transparent)
pmPainter = QPainter(pixmap)
pmPainter.translate(-devRect.x(), -devRect.y())
if orientation == Qt.Horizontal:
sMap = scaleMap
sMap.setPaintInterval(rect.left(), rect.right())
for x in range(devRect.left(), devRect.right()+1):
value = sMap.invTransform(x)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(x, devRect.top(), devRect.bottom())
else:
sMap = scaleMap
sMap.setPaintInterval(rect.bottom(), rect.top())
for y in range(devRect.top(), devRect.bottom()+1):
value = sMap.invTransform(y)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(devRect.left(), y, devRect.right(), y)
pmPainter.end()
self.drawPixmap(painter, rect, pixmap)
def qwtPathGraphic(path, pen, brush):
graphic = QwtGraphic()
graphic.setRenderHint(QwtGraphic.RenderPensUnscaled)
painter = QPainter(graphic)
painter.setPen(pen)
painter.setBrush(brush)
painter.drawPath(path)
painter.end()
return graphic
def qwtPathGraphic(path, pen, brush):
graphic = QwtGraphic()
graphic.setRenderHint(QwtGraphic.RenderPensUnscaled)
painter = QPainter(graphic)
painter.setPen(pen)
painter.setBrush(brush)
painter.drawPath(path)
painter.end()
return graphic
def toImage(self, xMap, yMap, series, from_, to, pen, antialiased,
numThreads):
if USE_THREADS:
if numThreads == 0:
numThreads = QThread.idealThreadCount()
if numThreads <= 0:
numThreads = 1
rect = self.__data.boundingRect.toAlignedRect()
image = QImage(rect.size(), QImage.Format_ARGB32)
image.fill(Qt.transparent)
if pen.width() <= 1 and pen.color().alpha() == 255:
command = QwtDotsCommand()
command.series = series
command.rgb = pen.color().rgba()
if USE_THREADS:
numPoints = int((to - from_ + 1) / numThreads)
futures = []
for i in range(numThreads):
pos = rect.topLeft()
index0 = from_ + i * numPoints
if i == numThreads - 1:
command.from_ = index0
command.to = to
qwtRenderDots(xMap, yMap, command, pos, image)
else:
command.from_ = index0
command.to = index0 + numPoints - 1
futures += [
QtConcurrent.run(qwtRenderDots, xMap, yMap,
command, pos, image)
]
for future in futures:
future.waitForFinished()
else:
command.from_ = from_
command.to = to
qwtRenderDots(xMap, yMap, command, rect.topLeft(), image)
else:
painter = QPainter(image)
painter.setPen(pen)
painter.setRenderHint(QPainter.Antialiasing, antialiased)
chunkSize = 1000
for i in range(chunkSize):
indexTo = min([i + chunkSize - 1, to])
points = self.toPoints(xMap, yMap, series, i, indexTo)
painter.drawPoints(points)
return image
def legendIcon(self, index, size):
"""
:param int index: Index of the legend entry (ignored as there is only one)
:param QSizeF size: Icon size
:return: Icon representing the curve on the legend
.. seealso::
:py:meth:`qwt.plot.QwtPlotItem.setLegendIconSize()`,
:py:meth:`qwt.plot.QwtPlotItem.legendData()`
"""
if size.isEmpty():
return QwtGraphic()
graphic = QwtGraphic()
graphic.setDefaultSize(size)
graphic.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(graphic)
painter.setRenderHint(
QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.legendAttributes == 0 or\
(self.__data.legendAttributes & QwtPlotCurve.LegendShowBrush):
brush = self.__data.brush
if brush.style(
) == Qt.NoBrush and self.__data.legendAttributes == 0:
if self.style() != QwtPlotCurve.NoCurve:
brush = QBrush(self.pen().color())
elif self.__data.symbol and\
self.__data.symbol.style() != QwtSymbol.NoSymbol:
brush = QBrush(self.__data.symbol.pen().color())
if brush.style() != Qt.NoBrush:
r = QRectF(0, 0, size.width(), size.height())
painter.fillRect(r, brush)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowLine:
if self.pen() != Qt.NoPen:
pn = self.pen()
# pn.setCapStyle(Qt.FlatCap)
painter.setPen(pn)
y = .5 * size.height()
painter.drawLine(0., y, size.width(), y)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowSymbol:
if self.__data.symbol:
r = QRectF(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return graphic
def drawColorBar(self, painter, colorMap, interval, scaleMap, orientation,
rect):
"""
Draw a color bar into a rectangle
:param QPainter painter: Painter
:param qwt.color_map.QwtColorMap colorMap: Color map
:param qwt.interval.QwtInterval interval: Value range
:param qwt.scalemap.QwtScaleMap scaleMap: Scale map
:param Qt.Orientation orientation: Orientation
:param QRectF rect: Target rectangle
"""
colorTable = []
if colorMap.format() == QwtColorMap.Indexed:
colorTable = colorMap.colorTable(interval)
c = QColor()
devRect = rect.toAlignedRect()
pixmap = QPixmap(devRect.size())
pixmap.fill(Qt.transparent)
pmPainter = QPainter(pixmap)
pmPainter.translate(-devRect.x(), -devRect.y())
if orientation == Qt.Horizontal:
sMap = QwtScaleMap(scaleMap)
sMap.setPaintInterval(rect.left(), rect.right())
for x in range(devRect.left(), devRect.right() + 1):
value = sMap.invTransform(x)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(x, devRect.top(), x, devRect.bottom())
else:
sMap = QwtScaleMap(scaleMap)
sMap.setPaintInterval(rect.bottom(), rect.top())
for y in range(devRect.top(), devRect.bottom() + 1):
value = sMap.invTransform(y)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(devRect.left(), y, devRect.right(), y)
pmPainter.end()
self.drawPixmap(painter, rect, pixmap)
def drawColorBar(self, painter, colorMap, interval, scaleMap,
orientation, rect):
"""
Draw a color bar into a rectangle
:param QPainter painter: Painter
:param qwt.color_map.QwtColorMap colorMap: Color map
:param qwt.interval.QwtInterval interval: Value range
:param qwt.scalemap.QwtScaleMap scaleMap: Scale map
:param Qt.Orientation orientation: Orientation
:param QRectF rect: Target rectangle
"""
colorTable = []
if colorMap.format() == QwtColorMap.Indexed:
colorTable = colorMap.colorTable(interval)
c = QColor()
devRect = rect.toAlignedRect()
pixmap = QPixmap(devRect.size())
pixmap.fill(Qt.transparent)
pmPainter = QPainter(pixmap)
pmPainter.translate(-devRect.x(), -devRect.y())
if orientation == Qt.Horizontal:
sMap = QwtScaleMap(scaleMap)
sMap.setPaintInterval(rect.left(), rect.right())
for x in range(devRect.left(), devRect.right()+1):
value = sMap.invTransform(x)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(x, devRect.top(), x, devRect.bottom())
else:
sMap = QwtScaleMap(scaleMap)
sMap.setPaintInterval(rect.bottom(), rect.top())
for y in range(devRect.top(), devRect.bottom()+1):
value = sMap.invTransform(y)
if colorMap.format() == QwtColorMap.RGB:
c.setRgba(colorMap.rgb(interval, value))
else:
c = colorTable[colorMap.colorIndex(interval, value)]
pmPainter.setPen(c)
pmPainter.drawLine(devRect.left(), y, devRect.right(), y)
pmPainter.end()
self.drawPixmap(painter, rect, pixmap)
def qwtDrawBackground(painter, canvas):
painter.save()
borderClip = canvas.borderPath(canvas.rect())
if not borderClip.isEmpty():
painter.setClipPath(borderClip, Qt.IntersectClip)
brush = canvas.palette().brush(canvas.backgroundRole())
if brush.style() == Qt.TexturePattern:
pm = QPixmap(canvas.size())
QwtPainter.fillPixmap(canvas, pm)
painter.drawPixmap(0, 0, pm)
elif brush.gradient():
rects = []
if brush.gradient().coordinateMode() == QGradient.ObjectBoundingMode:
rects += [canvas.rect()]
else:
rects += [painter.clipRegion().rects()]
useRaster = False
if painter.paintEngine().type() == QPaintEngine.X11:
useRaster = True
if useRaster:
format_ = QImage.Format_RGB32
stops = brush.gradient().stops()
for stop in stops:
if stop.second.alpha() != 255:
format_ = QImage.Format_ARGB32
break
image = QImage(canvas.size(), format_)
p = QPainter(image)
p.setPen(Qt.NoPen)
p.setBrush(brush)
p.drawRects(_rects_conv_PyQt5(rects))
p.end()
painter.drawImage(0, 0, image)
else:
painter.setPen(Qt.NoPen)
painter.setBrush(brush)
painter.drawRects(_rects_conv_PyQt5(rects))
else:
painter.setPen(Qt.NoPen)
painter.setBrush(brush)
painter.drawRects(_rects_conv_PyQt5(painter.clipRegion().rects()))
painter.restore()
def qwtDrawBackground(painter, canvas):
painter.save()
borderClip = canvas.borderPath(canvas.rect())
if not borderClip.isEmpty():
painter.setClipPath(borderClip, Qt.IntersectClip)
brush = canvas.palette().brush(canvas.backgroundRole())
if brush.style() == Qt.TexturePattern:
pm = QPixmap(canvas.size())
QwtPainter.fillPixmap(canvas, pm)
painter.drawPixmap(0, 0, pm)
elif brush.gradient():
rects = []
if brush.gradient().coordinateMode() == QGradient.ObjectBoundingMode:
rects += [canvas.rect()]
else:
rects += [painter.clipRegion().rects()]
useRaster = False
if painter.paintEngine().type() == QPaintEngine.X11:
useRaster = True
if useRaster:
format_ = QImage.Format_RGB32
stops = brush.gradient().stops()
for stop in stops:
if stop.second.alpha() != 255:
format_ = QImage.Format_ARGB32
break
image = QImage(canvas.size(), format_)
p = QPainter(image)
p.setPen(Qt.NoPen)
p.setBrush(brush)
p.drawRects(_rects_conv_PyQt5(rects))
p.end()
painter.drawImage(0, 0, image)
else:
painter.setPen(Qt.NoPen)
painter.setBrush(brush)
painter.drawRects(_rects_conv_PyQt5(rects))
else:
painter.setPen(Qt.NoPen)
painter.setBrush(brush)
painter.drawRects(_rects_conv_PyQt5(painter.clipRegion().rects()))
painter.restore()
def legendIcon(self, index, size):
"""
:param int index: Index of the legend entry (ignored as there is only one)
:param QSizeF size: Icon size
:return: Icon representing the curve on the legend
.. seealso::
:py:meth:`qwt.plot.QwtPlotItem.setLegendIconSize()`,
:py:meth:`qwt.plot.QwtPlotItem.legendData()`
"""
if size.isEmpty():
return QwtGraphic()
graphic = QwtGraphic()
graphic.setDefaultSize(size)
graphic.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(graphic)
painter.setRenderHint(QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.legendAttributes == 0 or\
(self.__data.legendAttributes & QwtPlotCurve.LegendShowBrush):
brush = self.__data.brush
if brush.style() == Qt.NoBrush and self.__data.legendAttributes == 0:
if self.style() != QwtPlotCurve.NoCurve:
brush = QBrush(self.pen().color())
elif self.__data.symbol and\
self.__data.symbol.style() != QwtSymbol.NoSymbol:
brush = QBrush(self.__data.symbol.pen().color())
if brush.style() != Qt.NoBrush:
r = QRectF(0, 0, size.width(), size.height())
painter.fillRect(r, brush)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowLine:
if self.pen() != Qt.NoPen:
pn = self.pen()
# pn.setCapStyle(Qt.FlatCap)
painter.setPen(pn)
y = .5*size.height()
painter.drawLine(0., y, size.width(), y)
if self.__data.legendAttributes & QwtPlotCurve.LegendShowSymbol:
if self.__data.symbol:
r = QRectF(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return graphic
def legendIcon(self, index, size):
if size.isEmpty():
return QwtGraphic()
icon = QwtGraphic()
icon.setDefaultSize(size)
icon.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(icon)
painter.setRenderHint(QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.style != QwtPlotMarker.NoLine:
painter.setPen(self.__data.pen)
if self.__data.style in (QwtPlotMarker.HLine, QwtPlotMarker.Cross):
y = .5*size.height()
QwtPainter.drawLine(painter, 0., y, size.width(), y)
if self.__data.style in (QwtPlotMarker.VLine, QwtPlotMarker.Cross):
x = .5*size.width()
QwtPainter.drawLine(painter, x, 0., x, size.height())
if self.__data.symbol:
r = QRect(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return icon
def toImage(self, xMap, yMap, series, from_, to, pen, antialiased):
"""
Translate a series into a QImage
:param qwt.scale_map.QwtScaleMap xMap: x map
:param qwt.scale_map.QwtScaleMap yMap: y map
:param series: Series of points to be mapped
:param int from_: Index of the first point to be painted
:param int to: Index of the last point to be painted
:param QPen pen: Pen used for drawing a point of the image, where a point is mapped to
:param bool antialiased: True, when the dots should be displayed antialiased
:return: Image displaying the series
"""
#TODO: rewrite this method to fix performance issue (litteral translation from C++!)
rect = self.__data.boundingRect.toAlignedRect()
image = QImage(rect.size(), QImage.Format_ARGB32)
image.fill(Qt.transparent)
if pen.width() <= 1 and pen.color().alpha() == 255:
bits = image.bits()
w = image.width()
h = image.height()
x0 = rect.topLeft().x()
y0 = rect.topLeft().y()
for i in range(from_, to+1):
sample = series.sample(i)
x = int(xMap.transform(sample.x())+0.5)-x0
y = int(yMap.transform(sample.y())+0.5)-y0
if x >= 0 and x < w and y >= 0 and y < h:
bits[y*w+x] = pen.color().rgba()
else:
painter = QPainter(image)
painter.setPen(pen)
painter.setRenderHint(QPainter.Antialiasing, antialiased)
chunkSize = 1000
for i in range(chunkSize):
indexTo = min([i+chunkSize-1, to])
points = self.toPoints(xMap, yMap, series, i, indexTo)
painter.drawPoints(points)
return image
def legendIcon(self, index, size):
if size.isEmpty():
return QwtGraphic()
icon = QwtGraphic()
icon.setDefaultSize(size)
icon.setRenderHint(QwtGraphic.RenderPensUnscaled, True)
painter = QPainter(icon)
painter.setRenderHint(
QPainter.Antialiasing,
self.testRenderHint(QwtPlotItem.RenderAntialiased))
if self.__data.style != QwtPlotMarker.NoLine:
painter.setPen(self.__data.pen)
if self.__data.style in (QwtPlotMarker.HLine, QwtPlotMarker.Cross):
y = .5 * size.height()
QwtPainter.drawLine(painter, 0., y, size.width(), y)
if self.__data.style in (QwtPlotMarker.VLine, QwtPlotMarker.Cross):
x = .5 * size.width()
QwtPainter.drawLine(painter, x, 0., x, size.height())
if self.__data.symbol:
r = QRect(0, 0, size.width(), size.height())
self.__data.symbol.drawSymbol(painter, r)
return icon
def toImage(self, xMap, yMap, series, from_, to, pen, antialiased):
"""
Translate a series into a QImage
:param qwt.scale_map.QwtScaleMap xMap: x map
:param qwt.scale_map.QwtScaleMap yMap: y map
:param series: Series of points to be mapped
:param int from_: Index of the first point to be painted
:param int to: Index of the last point to be painted
:param QPen pen: Pen used for drawing a point of the image, where a point is mapped to
:param bool antialiased: True, when the dots should be displayed antialiased
:return: Image displaying the series
"""
#TODO: rewrite this method to fix performance issue (litteral translation from C++!)
rect = self.__data.boundingRect.toAlignedRect()
image = QImage(rect.size(), QImage.Format_ARGB32)
image.fill(Qt.transparent)
if pen.width() <= 1 and pen.color().alpha() == 255:
bits = image.bits()
w = image.width()
h = image.height()
x0 = rect.topLeft().x()
y0 = rect.topLeft().y()
for i in range(from_, to + 1):
sample = series.sample(i)
x = int(xMap.transform(sample.x()) + 0.5) - x0
y = int(yMap.transform(sample.y()) + 0.5) - y0
if x >= 0 and x < w and y >= 0 and y < h:
bits[y * w + x] = pen.color().rgba()
else:
painter = QPainter(image)
painter.setPen(pen)
painter.setRenderHint(QPainter.Antialiasing, antialiased)
chunkSize = 1000
for i in range(chunkSize):
indexTo = min([i + chunkSize - 1, to])
points = self.toPoints(xMap, yMap, series, i, indexTo)
painter.drawPoints(points)
return image
