def _renderChart(self, cx):
"""Renders a pie chart"""
cx.set_line_join(cairo.LINE_JOIN_ROUND)
if self.options.stroke.shadow:
cx.save()
cx.set_source_rgba(0, 0, 0, 0.15)
cx.new_path()
cx.move_to(self.centerx, self.centery)
cx.arc(self.centerx + 1, self.centery + 2, self.radius + 1, 0,
math.pi * 2)
cx.line_to(self.centerx, self.centery)
cx.close_path()
cx.fill()
cx.restore()
cx.save()
for slice in self.slices:
if slice.isBigEnough():
cx.set_source_rgb(*self.colorScheme[slice.name])
if self.options.shouldFill:
slice.draw(cx, self.centerx, self.centery, self.radius)
cx.fill()
if not self.options.stroke.hide:
slice.draw(cx, self.centerx, self.centery, self.radius)
cx.set_line_width(self.options.stroke.width)
cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
cx.stroke()
cx.restore()
def _renderLegend(self, cx):
"""This function adds a legend to the chart"""
if self.options.legend.hide:
return
surface_width, surface_height = self.getSurfaceSize()
# Compute legend dimensions
padding = 4
bullet = 15
width = 0
height = padding
keys = self._getDatasetsKeys()
for key in keys:
extents = cx.text_extents(key)
width = max(extents[2], width)
height += max(extents[3], bullet) + padding
width = padding + bullet + padding + width + padding
# Compute legend position
legend = self.options.legend
if legend.position.right is not None:
legend.position.left = (surface_width
- legend.position.right
- width)
if legend.position.bottom is not None:
legend.position.top = (surface_height
- legend.position.bottom
- height)
# Draw the legend
cx.save()
cx.rectangle(self.options.legend.position.left,
self.options.legend.position.top,
width, height)
cx.set_source_rgba(1, 1, 1, self.options.legend.opacity)
cx.fill_preserve()
cx.set_line_width(self.options.stroke.width)
cx.set_source_rgb(*hex2rgb(self.options.legend.borderColor))
cx.stroke()
def drawKey(key, x, y, text_height):
cx.rectangle(x, y, bullet, bullet)
cx.set_source_rgb(*self.colorScheme[key])
cx.fill_preserve()
cx.set_source_rgb(0, 0, 0)
cx.stroke()
cx.move_to(x + bullet + padding,
y + bullet / 2.0 + text_height / 2.0)
cx.show_text(key)
cx.set_line_width(1)
x = self.options.legend.position.left + padding
y = self.options.legend.position.top + padding
for key in keys:
extents = cx.text_extents(key)
drawKey(key, x, y, extents[3])
y += max(extents[3], bullet) + padding
cx.restore()
def _renderChart(self, cx):
"""Renders a pie chart"""
cx.set_line_join(cairo.LINE_JOIN_ROUND)
if self.options.stroke.shadow:
cx.save()
cx.set_source_rgba(0, 0, 0, 0.15)
cx.new_path()
cx.move_to(self.centerx, self.centery)
cx.arc(self.centerx + 1, self.centery + 2, self.radius + 1, 0,
math.pi * 2)
cx.line_to(self.centerx, self.centery)
cx.close_path()
cx.fill()
cx.restore()
cx.save()
for slice in self.slices:
if slice.isBigEnough():
cx.set_source_rgb(*self.colorScheme[slice.name])
if self.options.shouldFill:
slice.draw(cx, self.centerx, self.centery, self.radius)
cx.fill()
if not self.options.stroke.hide:
slice.draw(cx, self.centerx, self.centery, self.radius)
cx.set_line_width(self.options.stroke.width)
cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
cx.stroke()
cx.restore()
def drawBar(bar):
stroke_width = self.options.stroke.width
ux, uy = cx.device_to_user_distance(stroke_width, stroke_width)
if ux < uy:
ux = uy
cx.set_line_width(ux)
# gather bar proportions
x = self.area.x + self.area.w * bar.x
y = self.area.y + self.area.h * bar.y
w = self.area.w * bar.w
h = self.area.h * bar.h
if w < 1 or h < 1:
return # don't draw when the bar is too small
if self.options.stroke.shadow:
cx.set_source_rgba(0, 0, 0, 0.15)
rectangle = self._getShadowRectangle(x, y, w, h)
cx.rectangle(*rectangle)
cx.fill()
if self.options.shouldFill or (not self.options.stroke.hide):
if self.options.shouldFill:
cx.set_source_rgb(*self.colorScheme[bar.name])
cx.rectangle(x, y, w, h)
cx.fill()
if not self.options.stroke.hide:
cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
cx.rectangle(x, y, w, h)
cx.stroke()
# render yvals above/beside bars
if self.options.yvals.show:
cx.save()
cx.set_font_size(self.options.yvals.fontSize)
cx.set_source_rgb(*hex2rgb(self.options.yvals.fontColor))
label = unicode(bar.yval)
extents = cx.text_extents(label)
labelW = extents[2]
labelH = extents[3]
self._renderYVal(cx, label, labelW, labelH, x, y, w, h)
cx.restore()
def _renderLegend(self, cx):
"""This function adds a legend to the chart"""
if self.options.legend.hide:
return
surface_width, surface_height = self.getSurfaceSize()
# Compute legend dimensions
padding = 4
bullet = 15
width = 0
height = padding
keys = self._getDatasetsKeys()
for key in keys:
extents = cx.text_extents(key)
width = max(extents[2], width)
height += max(extents[3], bullet) + padding
width = padding + bullet + padding + width + padding
# Compute legend position
legend = self.options.legend
if legend.position.right is not None:
legend.position.left = (surface_width - legend.position.right -
width)
if legend.position.bottom is not None:
legend.position.top = (surface_height - legend.position.bottom -
height)
# Draw the legend
cx.save()
cx.rectangle(self.options.legend.position.left,
self.options.legend.position.top, width, height)
cx.set_source_rgba(1, 1, 1, self.options.legend.opacity)
cx.fill_preserve()
cx.set_line_width(self.options.stroke.width)
cx.set_source_rgb(*hex2rgb(self.options.legend.borderColor))
cx.stroke()
def drawKey(key, x, y, text_height):
cx.rectangle(x, y, bullet, bullet)
cx.set_source_rgb(*self.colorScheme[key])
cx.fill_preserve()
cx.set_source_rgb(0, 0, 0)
cx.stroke()
cx.move_to(x + bullet + padding,
y + bullet / 2.0 + text_height / 2.0)
cx.show_text(key)
cx.set_line_width(1)
x = self.options.legend.position.left + padding
y = self.options.legend.position.top + padding
for key in keys:
extents = cx.text_extents(key)
drawKey(key, x, y, extents[3])
y += max(extents[3], bullet) + padding
cx.restore()
def _renderBackground(self, cx):
"""Renders the background area of the chart"""
if self.options.background.hide:
return
cx.save()
if self.options.background.baseColor:
cx.set_source_rgb(*hex2rgb(self.options.background.baseColor))
cx.paint()
if self.options.background.chartColor:
cx.set_source_rgb(*hex2rgb(self.options.background.chartColor))
cx.rectangle(self.area.x, self.area.y, self.area.w, self.area.h)
cx.fill()
if self.options.background.lineColor:
cx.set_source_rgb(*hex2rgb(self.options.background.lineColor))
cx.set_line_width(self.options.axis.lineWidth)
self._renderLines(cx)
cx.restore()
def _renderBackground(self, cx):
"""Renders the background area of the chart"""
if self.options.background.hide:
return
cx.save()
if self.options.background.baseColor:
cx.set_source_rgb(*hex2rgb(self.options.background.baseColor))
cx.paint()
if self.options.background.chartColor:
cx.set_source_rgb(*hex2rgb(self.options.background.chartColor))
cx.rectangle(self.area.x, self.area.y, self.area.w, self.area.h)
cx.fill()
if self.options.background.lineColor:
cx.set_source_rgb(*hex2rgb(self.options.background.lineColor))
cx.set_line_width(self.options.axis.lineWidth)
self._renderLines(cx)
cx.restore()
def _renderAxis(self, cx):
"""Renders axis"""
if self.options.axis.x.hide and self.options.axis.y.hide:
return
cx.save()
cx.set_source_rgb(*hex2rgb(self.options.axis.lineColor))
cx.set_line_width(self.options.axis.lineWidth)
if not self.options.axis.y.hide:
if self.yticks:
for tick in self.yticks:
self._renderYTick(cx, tick)
if self.options.axis.y.label:
cx.save()
rotate = self.options.axis.y.rotate
tickWidth, tickHeight = self._getTickSize(
cx, self.yticks, rotate)
label = unicode(self.options.axis.y.label)
x = self.area.x - tickWidth - 4.0
y = self.area.y + 0.5 * self.area.h
self._renderAxisLabel(cx, tickWidth, tickHeight, label, x, y,
True)
cx.restore()
self._renderYAxis(cx)
if not self.options.axis.x.hide:
fontAscent = cx.font_extents()[0]
if self.xticks:
for tick in self.xticks:
self._renderXTick(cx, tick, fontAscent)
if self.options.axis.x.label:
cx.save()
rotate = self.options.axis.x.rotate
tickWidth, tickHeight = self._getTickSize(
cx, self.xticks, rotate)
label = unicode(self.options.axis.x.label)
x = self.area.x + self.area.w / 2.0
y = self.area.y + self.area.h + tickHeight + 4.0
self._renderAxisLabel(cx, tickWidth, tickHeight, label, x, y,
False)
cx.restore()
self._renderXAxis(cx)
cx.restore()
def _renderAxis(self, cx):
"""Renders axis"""
if self.options.axis.x.hide and self.options.axis.y.hide:
return
cx.save()
cx.set_source_rgb(*hex2rgb(self.options.axis.lineColor))
cx.set_line_width(self.options.axis.lineWidth)
if not self.options.axis.y.hide:
if self.yticks:
for tick in self.yticks:
self._renderYTick(cx, tick)
if self.options.axis.y.label:
cx.save()
rotate = self.options.axis.y.rotate
tickWidth, tickHeight = self._getTickSize(cx, self.yticks,
rotate)
label = unicode(self.options.axis.y.label)
x = self.area.x - tickWidth - 4.0
y = self.area.y + 0.5 * self.area.h
self._renderAxisLabel(cx, tickWidth, tickHeight, label, x, y,
True)
cx.restore()
self._renderYAxis(cx)
if not self.options.axis.x.hide:
fontAscent = cx.font_extents()[0]
if self.xticks:
for tick in self.xticks:
self._renderXTick(cx, tick, fontAscent)
if self.options.axis.x.label:
cx.save()
rotate = self.options.axis.x.rotate
tickWidth, tickHeight = self._getTickSize(cx, self.xticks,
rotate)
label = unicode(self.options.axis.x.label)
x = self.area.x + self.area.w / 2.0
y = self.area.y + self.area.h + tickHeight + 4.0
self._renderAxisLabel(cx, tickWidth, tickHeight, label, x, y,
False)
cx.restore()
self._renderXAxis(cx)
cx.restore()
def _renderBackground(self, cx):
"""Renders the background of the chart"""
if self.options.background.hide:
return
cx.save()
if self.options.background.baseColor:
cx.set_source_rgb(*hex2rgb(self.options.background.baseColor))
x, y, w, h = 0, 0, self.area.w, self.area.h
w += self.options.padding.left + self.options.padding.right
h += self.options.padding.top + self.options.padding.bottom
cx.rectangle(x, y, w, h)
cx.fill()
cx.restore()
def _renderBackground(self, cx):
"""Renders the background of the chart"""
if self.options.background.hide:
return
cx.save()
if self.options.background.baseColor:
cx.set_source_rgb(*hex2rgb(self.options.background.baseColor))
x, y, w, h = 0, 0, self.area.w, self.area.h
w += self.options.padding.left + self.options.padding.right
h += self.options.padding.top + self.options.padding.bottom
cx.rectangle(x, y, w, h)
cx.fill()
cx.restore()
def _renderAxis(self, cx):
"""Renders the axis for pie charts"""
if self.options.axis.x.hide or not self.xticks:
return
self.xlabels = []
lookup = dict([(slice.xval, slice) for slice in self.slices])
cx.select_font_face(self.options.axis.tickFont,
cairo.FONT_SLANT_NORMAL,
cairo.FONT_WEIGHT_NORMAL)
cx.set_font_size(self.options.axis.tickFontSize)
cx.set_source_rgb(*hex2rgb(self.options.axis.labelColor))
for tick in self.xticks:
slice = lookup[tick[0]]
normalisedAngle = slice.getNormalisedAngle()
big_radius = self.radius + 10
labelx = self.centerx + math.sin(normalisedAngle) * big_radius
labely = self.centery - math.cos(normalisedAngle) * big_radius
label = tick[1]
extents = cx.text_extents(label)
labelWidth = extents[2]
labelHeight = extents[3]
x = y = 0
if normalisedAngle <= math.pi * 0.5:
x = labelx
y = labely - labelHeight
elif math.pi * 0.5 < normalisedAngle <= math.pi:
x = labelx
y = labely
elif math.pi < normalisedAngle <= math.pi * 1.5:
x = labelx - labelWidth
y = labely
else:
x = labelx - labelWidth
y = labely - labelHeight
# draw label with text tick[1]
cx.move_to(x, y)
cx.show_text(label)
self.xlabels.append(label)
def _renderAxis(self, cx):
"""Renders the axis for pie charts"""
if self.options.axis.x.hide or not self.xticks:
return
self.xlabels = []
lookup = dict([(slice.xval, slice) for slice in self.slices])
cx.select_font_face(self.options.axis.tickFont,
cairo.FONT_SLANT_NORMAL, cairo.FONT_WEIGHT_NORMAL)
cx.set_font_size(self.options.axis.tickFontSize)
cx.set_source_rgb(*hex2rgb(self.options.axis.labelColor))
for tick in self.xticks:
slice = lookup[tick[0]]
normalisedAngle = slice.getNormalisedAngle()
big_radius = self.radius + 10
labelx = self.centerx + math.sin(normalisedAngle) * big_radius
labely = self.centery - math.cos(normalisedAngle) * big_radius
label = tick[1]
extents = cx.text_extents(label)
labelWidth = extents[2]
labelHeight = extents[3]
x = y = 0
if normalisedAngle <= math.pi * 0.5:
x = labelx
y = labely - labelHeight
elif math.pi * 0.5 < normalisedAngle <= math.pi:
x = labelx
y = labely
elif math.pi < normalisedAngle <= math.pi * 1.5:
x = labelx - labelWidth
y = labely
else:
x = labelx - labelWidth
y = labely - labelHeight
# draw label with text tick[1]
cx.move_to(x, y)
cx.show_text(label)
self.xlabels.append(label)
def drawLine(storeName):
if self.options.stroke.shadow:
# draw shadow
cx.save()
cx.set_source_rgba(0, 0, 0, 0.15)
cx.translate(2, -2)
preparePath(storeName)
cx.fill()
cx.restore()
# fill the line
cx.set_source_rgb(*self.colorScheme[storeName])
preparePath(storeName)
cx.fill()
if not self.options.stroke.hide:
# draw stroke
cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
preparePath(storeName)
cx.stroke()
def drawLine(storeName):
if self.options.stroke.shadow:
# draw shadow
cx.save()
cx.set_source_rgba(0, 0, 0, 0.15)
cx.translate(2, -2)
preparePath(storeName)
cx.fill()
cx.restore()
# fill the line
cx.set_source_rgb(*self.colorScheme[storeName])
preparePath(storeName)
cx.fill()
if not self.options.stroke.hide:
# draw stroke
cx.set_source_rgb(*hex2rgb(self.options.stroke.color))
preparePath(storeName)
cx.stroke()
