def calculateDatasets(self, scene, axes, datasets):
"""
Builds the datasets for this renderer. Each renderer will need to
subclass and implemenent this method, otherwise, no data will be
shown in the chart.
:param scene | <XChartScene>
axes | [<
datasets | [<XChartDataset>, ..]
"""
items = self.calculateDatasetItems(scene, datasets)
if not items:
scene.clear()
return
rect = self.buildData('axis_rect')
half_size = self.maximumBarSize() / 2.0
for dataset, item in items.items():
path = QPainterPath()
subpaths = []
for value in dataset.values():
pos = self.pointAt(axes, value)
radius = min(rect.bottom() - pos.y(), 8)
subpath = QPainterPath()
# create a vertical bar graph
if self.orientation() == Qt.Vertical:
subpath.moveTo(pos.x() - half_size, rect.bottom())
subpath.lineTo(pos.x() - half_size, pos.y() + radius)
subpath.quadTo(pos.x() - half_size, pos.y(),
pos.x() - half_size + radius, pos.y())
subpath.lineTo(pos.x() + half_size - radius, pos.y())
subpath.quadTo(pos.x() + half_size, pos.y(),
pos.x() + half_size,
pos.y() + radius)
subpath.lineTo(pos.x() + half_size, rect.bottom())
subpath.lineTo(pos.x() - half_size, rect.bottom())
# create a horizontal bar graph
else:
subpath.moveTo(rect.left(), pos.y() - half_size)
subpath.lineTo(pos.x(), pos.y() - half_size)
subpath.lineTo(pos.x(), pos.y() + half_size)
subpath.lineTo(rect.left(), pos.y() + half_size)
subpath.lineTo(rect.left(), pos.y() - half_size)
path.addPath(subpath)
subpaths.append(subpath)
item.setPath(path)
item.setBuildData('subpaths', subpaths)
def calculateDatasets(self, scene, axes, datasets):
"""
Builds the datasets for this renderer. Each renderer will need to
subclass and implemenent this method, otherwise, no data will be
shown in the chart.
:param scene | <XChartScene>
axes | [<
datasets | [<XChartDataset>, ..]
"""
items = self.calculateDatasetItems(scene, datasets)
if not items:
scene.clear()
return
rect = self.buildData('axis_rect')
half_size = self.maximumBarSize() / 2.0
for dataset, item in items.items():
path = QPainterPath()
subpaths = []
for value in dataset.values():
pos = self.pointAt(axes, value)
radius = min(rect.bottom() - pos.y(), 8)
subpath = QPainterPath()
# create a vertical bar graph
if self.orientation() == Qt.Vertical:
subpath.moveTo(pos.x() - half_size, rect.bottom())
subpath.lineTo(pos.x() - half_size, pos.y() + radius)
subpath.quadTo(pos.x() - half_size, pos.y(),
pos.x() - half_size + radius, pos.y())
subpath.lineTo(pos.x() + half_size - radius, pos.y())
subpath.quadTo(pos.x() + half_size, pos.y(),
pos.x() + half_size, pos.y() + radius)
subpath.lineTo(pos.x() + half_size, rect.bottom())
subpath.lineTo(pos.x() - half_size, rect.bottom())
# create a horizontal bar graph
else:
subpath.moveTo(rect.left(), pos.y() - half_size)
subpath.lineTo(pos.x(), pos.y() - half_size)
subpath.lineTo(pos.x(), pos.y() + half_size)
subpath.lineTo(rect.left(), pos.y() + half_size)
subpath.lineTo(rect.left(), pos.y() - half_size)
path.addPath(subpath)
subpaths.append(subpath)
item.setPath(path)
item.setBuildData('subpaths', subpaths)
def rebuild(self):
"""
Rebuilds the item based on the current points.
"""
scene = self.scene()
if not scene:
return
self._subpaths = []
grid = scene.gridRect()
typ = self.chartType()
hruler = scene.horizontalRuler()
vruler = scene.verticalRuler()
path = QPainterPath()
area = QPainterPath()
self._buildData.clear()
self._buildData['path_area'] = area
self.setPos(0, 0)
# draw a line item
if typ == XChartScene.Type.Line:
first = True
pos = None
home = None
self._ellipses = []
points = self.points()
if (self.orientation() == Qt.Horizontal):
points.sort(hruler.compareValues, key=lambda x: x[0])
else:
points.sort(vruler.compareValues, key=lambda y: y[1])
points.reverse()
for x, y in self.points():
pos = scene.mapFromChart(x, y)
if first:
home = QPointF(pos.x(), grid.bottom())
area.moveTo(home)
area.lineTo(pos)
path.moveTo(pos)
self._ellipses.append(pos)
first = False
else:
path.lineTo(pos)
area.lineTo(pos)
self._ellipses.append(pos)
if pos and home:
area.lineTo(pos.x(), grid.bottom())
area.lineTo(home)
# draw a bar item
elif typ == XChartScene.Type.Bar:
barsize = self.barSize()
horiz = self.orientation() == Qt.Horizontal
for x, y in self.points():
pos = scene.mapFromChart(x, y)
subpath = QPainterPath()
if horiz:
r = min(grid.bottom() - pos.y(), 8)
subpath.moveTo(pos.x() - barsize / 2.0, grid.bottom())
subpath.lineTo(pos.x() - barsize / 2.0, pos.y() + r)
subpath.quadTo(pos.x() - barsize / 2.0, pos.y(),
pos.x() - barsize / 2.0 + r, pos.y())
subpath.lineTo(pos.x() + barsize / 2.0 - r, pos.y())
subpath.quadTo(pos.x() + barsize / 2.0, pos.y(),
pos.x() + barsize / 2.0,
pos.y() + r)
subpath.lineTo(pos.x() + barsize / 2.0, grid.bottom())
subpath.lineTo(pos.x() - barsize / 2.0, grid.bottom())
else:
subpath.moveTo(grid.left(), pos.y() - barsize / 2.0)
subpath.lineTo(pos.x(), pos.y() - barsize / 2.0)
subpath.lineTo(pos.x(), pos.y() + barsize / 2.0)
subpath.lineTo(grid.left(), pos.y() + barsize / 2.0)
subpath.lineTo(grid.left(), pos.y() - barsize / 2.0)
path.addPath(subpath)
self._subpaths.append((x, y, subpath))
# draw a pie chart
elif typ == XChartScene.Type.Pie:
if self.orientation() == Qt.Horizontal:
key_index = 0
value_index = 1
value_ruler = self.verticalRuler()
else:
key_index = 1
value_index = 0
value_ruler = self.horizontalRuler()
pie_values = {}
for point in self.points():
key = point[key_index]
value = point[value_index]
pie_values.setdefault(key, [])
pie_values[key].append(value)
for key, values in pie_values.items():
pie_values[key] = value_ruler.calcTotal(values)
total = max(1, value_ruler.calcTotal(pie_values.values()))
# calculate drawing parameters
center = self.pieCenter()
radius = self.radius()
diameter = radius * 2
angle = 0
bound = QRectF(-radius, -radius, diameter, diameter)
for key, value in sorted(pie_values.items(), key=lambda x: x[1]):
# calculate the percentage
perc = float(value) / total
# calculate the angle as the perc * 360
item_angle = perc * 360
self.setPos(center)
sub_path = QPainterPath()
sub_path.arcTo(bound, angle, item_angle)
sub_path.lineTo(0, 0)
path.addPath(sub_path)
self._subpaths.append((key, value, sub_path))
angle += item_angle
self.setPath(path)
self._dirty = False
def rebuild( self ):
"""
Rebuilds the item based on the current points.
"""
scene = self.scene()
if not scene:
return
self._subpaths = []
grid = scene.gridRect()
typ = self.chartType()
hruler = scene.horizontalRuler()
vruler = scene.verticalRuler()
path = QPainterPath()
area = QPainterPath()
self._buildData.clear()
self._buildData['path_area'] = area
self.setPos(0, 0)
# draw a line item
if typ == XChartScene.Type.Line:
first = True
pos = None
home = None
self._ellipses = []
points = self.points()
if ( self.orientation() == Qt.Horizontal ):
points.sort(hruler.compareValues, key = lambda x: x[0])
else:
points.sort(vruler.compareValues, key = lambda y: y[1])
points.reverse()
for x, y in self.points():
pos = scene.mapFromChart(x, y)
if first:
home = QPointF(pos.x(), grid.bottom())
area.moveTo(home)
area.lineTo(pos)
path.moveTo(pos)
self._ellipses.append(pos)
first = False
else:
path.lineTo(pos)
area.lineTo(pos)
self._ellipses.append(pos)
if pos and home:
area.lineTo(pos.x(), grid.bottom())
area.lineTo(home)
# draw a bar item
elif typ == XChartScene.Type.Bar:
barsize = self.barSize()
horiz = self.orientation() == Qt.Horizontal
for x, y in self.points():
pos = scene.mapFromChart(x, y)
subpath = QPainterPath()
if horiz:
r = min(grid.bottom() - pos.y(), 8)
subpath.moveTo(pos.x() - barsize / 2.0, grid.bottom())
subpath.lineTo(pos.x() - barsize / 2.0, pos.y() + r)
subpath.quadTo(pos.x() - barsize / 2.0, pos.y(),
pos.x() - barsize / 2.0 + r, pos.y())
subpath.lineTo(pos.x() + barsize / 2.0 - r, pos.y())
subpath.quadTo(pos.x() + barsize / 2.0, pos.y(),
pos.x() + barsize / 2.0, pos.y() + r)
subpath.lineTo(pos.x() + barsize / 2.0, grid.bottom())
subpath.lineTo(pos.x() - barsize / 2.0, grid.bottom())
else:
subpath.moveTo(grid.left(), pos.y() - barsize / 2.0)
subpath.lineTo(pos.x(), pos.y() - barsize / 2.0)
subpath.lineTo(pos.x(), pos.y() + barsize / 2.0)
subpath.lineTo(grid.left(), pos.y() + barsize / 2.0)
subpath.lineTo(grid.left(), pos.y() - barsize / 2.0)
path.addPath(subpath)
self._subpaths.append((x, y, subpath))
# draw a pie chart
elif typ == XChartScene.Type.Pie:
if self.orientation() == Qt.Horizontal:
key_index = 0
value_index = 1
value_ruler = self.verticalRuler()
else:
key_index = 1
value_index = 0
value_ruler = self.horizontalRuler()
pie_values = {}
for point in self.points():
key = point[key_index]
value = point[value_index]
pie_values.setdefault(key, [])
pie_values[key].append(value)
for key, values in pie_values.items():
pie_values[key] = value_ruler.calcTotal(values)
total = max(1, value_ruler.calcTotal(pie_values.values()))
# calculate drawing parameters
center = self.pieCenter()
radius = self.radius()
diameter = radius * 2
angle = 0
bound = QRectF(-radius, -radius, diameter, diameter)
for key, value in sorted(pie_values.items(), key = lambda x: x[1]):
# calculate the percentage
perc = float(value) / total
# calculate the angle as the perc * 360
item_angle = perc * 360
self.setPos(center)
sub_path = QPainterPath()
sub_path.arcTo(bound, angle, item_angle)
sub_path.lineTo(0, 0)
path.addPath(sub_path)
self._subpaths.append((key, value, sub_path))
angle += item_angle
self.setPath(path)
self._dirty = False
