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 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 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
