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chart.py
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chart.py
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from itertools import cycle
from PyQt4.Qt import *
DEFAULT_COLORS = [0x3366cc, 0xdc3912, 0xff9900, 0x109618, 0x990099,
0x0099c6, 0xdd4477, 0x66aa00, 0xb82e2e, 0x316395,
0x994499, 0x22aa99, 0xaaaa11, 0x6633cc, 0x16d620]
class Chart(object):
def __init__(self, data, colors=None):
self.data = data
self.colors = colors
self._ref_col = 0
self._ref_isv = True
def setVerticalAxisColumn(self, column):
self._ref_col = column
self._ref_isv = True
def setHorizontalAxisColumn(self, column):
self._ref_col = column
self._ref_isv = False
def save(self, filename, chart_size, legend_width=None):
image_size = chart_size
if legend_width is not None:
image_size = image_size + QSize(legend_width, 0)
image = QImage(image_size, QImage.Format_ARGB32_Premultiplied)
painter = QPainter(image)
painter.setRenderHint(QPainter.Antialiasing)
painter.fillRect(image.rect(), Qt.white)
self.draw(painter, QRect(QPoint(0, 0), chart_size))
if legend_width is not None:
self.drawLegend(painter, QRect(QPoint(chart_size.width(), 10), QSize(legend_width, chart_size.height())))
painter.end()
return image.save(filename)
def draw(self, painter, rectangle):
raise NotImplementedError
def drawLegend(self, painter, rectangle):
SPACE = 2
font_metrics = painter.fontMetrics()
size = font_metrics.xHeight() * 2
y = SPACE
x0 = SPACE
x1 = x0 + size + SPACE * 3
w = rectangle.width() - size - SPACE
tw = w - x1
painter.save()
painter.translate(rectangle.x(), rectangle.y())
color = self._icolors()
for i, column in enumerate(self._fetchLegendData()):
if (y + size + SPACE * 2) >= (rectangle.y() + rectangle.height()) and i < (len(self.data.columns) - 1):
painter.drawText(x1, y, tw, size, Qt.AlignLeft | Qt.AlignVCenter, "...")
y += size + SPACE
break
text = font_metrics.elidedText(column, Qt.ElideRight, tw)
painter.fillRect(x0, y, size, size, QColor(next(color)))
painter.drawText(x1, y, tw, size, Qt.AlignLeft | Qt.AlignVCenter, text)
y += size + SPACE
painter.setPen(Qt.lightGray)
painter.drawRect(0, 0, w, y)
painter.restore()
def _fetchLegendData(self):
for i, column in enumerate(self.data.columns):
if i != self._ref_col:
yield column
def _icolors(self):
if self.colors is None:
return cycle(DEFAULT_COLORS)
return cycle(self.colors)
class PieChart(Chart):
def draw(self, painter, rectangle):
painter.save()
painter.translate(rectangle.x(), rectangle.y())
# Calculate Values
vtotal = float(sum(row[not self._ref_col] for row in self.data.rows))
values = [row[not self._ref_col] / vtotal for row in self.data.rows]
# Draw Char
start_angle = 90 * 16
for color, v in zip(self._icolors(), values):
span_angle = v * -360.0 * 16
painter.setPen(Qt.white)
painter.setBrush(QColor(color))
painter.drawPie(rectangle, start_angle, span_angle)
start_angle += span_angle
painter.restore()
def _fetchLegendData(self):
for row in self.data.rows:
yield row[self._ref_col]
class ScatterChart(Chart):
SPAN = 10
def __init__(self, data, **kwargs):
super(ScatterChart, self).__init__(data, **kwargs)
self.haxis_title = None
self.haxis_vmin = None
self.haxis_vmax = None
self.haxis_step = None
self.haxis_grid = True
self.vaxis_title = None
self.vaxis_vmin = None
self.vaxis_vmax = None
self.vaxis_step = None
self.vaxis_grid = True
def draw(self, painter, rectangle):
self._setupDefaultValues()
font_metrics = painter.fontMetrics()
h = font_metrics.xHeight() * 2
x = font_metrics.width(self._vToString(self.vaxis_vmax))
# Calculate X steps
nxstep = int(round((self.haxis_vmax - self.haxis_vmin) / self.haxis_step))
nystep = int(round((self.vaxis_vmax - self.vaxis_vmin) / self.vaxis_step))
# Calculate chart space
xmin = h + self.SPAN + x
xstep = (rectangle.width() - xmin - (h + self.SPAN)) / nxstep
xmax = xmin + xstep * nxstep
# Calculate Y steps
ymin = h + self.SPAN
ystep = (rectangle.height() - ymin - (h * 2 + self.SPAN)) / nystep
ymax = ymin + ystep * nystep
painter.save()
painter.translate(rectangle.x(), rectangle.y())
# Draw Axis Titles
painter.save()
self._drawAxisTitles(painter, xmin, xmax, ymin, ymax)
painter.restore()
# Draw Axis Labels
painter.save()
self._drawAxisLabels(painter, xmin, xmax, ymin, ymax, xstep, nxstep, ystep, nystep)
painter.restore()
# Draw Data
painter.save()
painter.setClipRect(xmin + 1, ymin, xmax - xmin - 2, ymax - ymin - 1)
self._drawData(painter, xmin, xmax, ymin, ymax)
painter.restore()
# Draw Border
painter.setPen(Qt.black)
painter.drawLine(xmin, ymin, xmin, ymax)
painter.drawLine(xmin, ymax, xmax, ymax)
painter.restore()
def _drawAxisTitles(self, painter, xmin, xmax, ymin, ymax):
font_metrics = painter.fontMetrics()
h = font_metrics.xHeight() * 2
hspan = self.SPAN / 2
font = painter.font()
font.setItalic(True)
painter.setFont(font)
if self.haxis_title is not None:
painter.drawText(xmin + ((xmax - xmin) / 2 - font_metrics.width(self.haxis_title) / 2), ymax + h * 2 + hspan, self.haxis_title)
if self.vaxis_title is not None:
painter.rotate(90)
painter.drawText(ymin + (ymax - ymin) / 2 - font_metrics.width(self.vaxis_title) / 2, -hspan, self.vaxis_title)
def _drawAxisLabels(self, painter, xmin, xmax, ymin, ymax, xstep, nxstep, ystep, nystep):
font_metrics = painter.fontMetrics()
h = font_metrics.xHeight() * 2
# Draw Internal Grid
painter.setPen(Qt.lightGray)
x = xmin + xstep
ys = ymin if self.haxis_grid else ymax - 4
for _ in xrange(nxstep):
painter.drawLine(x, ys, x, ymax)
x += xstep
y = ymin
xe = xmax if self.vaxis_grid else xmin + 4
for _ in xrange(nystep):
painter.drawLine(xmin, y, xe, y)
y += ystep
# Draw Axis Labels
painter.setPen(Qt.black)
for i in xrange(1 + nxstep):
x = xmin + (i * xstep)
v = self._hToString(self.haxis_vmin + i * self.haxis_step)
painter.drawText(x - font_metrics.width(v) / 2, 2 + ymax + h, v)
for i in xrange(1 + nystep):
y = ymin + (i * ystep)
v = self._vToString(self.vaxis_vmin + (nystep - i) * self.vaxis_step)
painter.drawText(xmin - font_metrics.width(v) - 2, y, v)
def _drawData(self, painter, xmin, xmax, ymin, ymax):
c = 0
color = self._icolors()
while c < len(self.data.columns):
if c != self._ref_col:
if self._ref_isv:
a, b = c, self._ref_col
else:
a, b = self._ref_col, c
self._drawColumnData(painter, next(color), a, b, xmin, xmax, ymin, ymax)
c += 1
def _drawColumnData(self, painter, color, xcol, ycol, xmin, xmax, ymin, ymax):
painter.setPen(QPen(QColor(color), 7, Qt.SolidLine, Qt.RoundCap))
for row in self.data.rows:
x, y = self._xyFromData(row[xcol], row[ycol], xmin, xmax, ymin, ymax)
painter.drawPoint(x, y)
def _xyFromData(self, xdata, ydata, xmin, xmax, ymin, ymax):
x = xmin + (float(xdata - self.haxis_vmin) / (self.haxis_vmax - self.haxis_vmin)) * (xmax - xmin)
y = ymin + (1.0 - (float(ydata - self.vaxis_vmin) / (self.vaxis_vmax - self.vaxis_vmin))) * (ymax - ymin)
return x, y
def _vToString(self, value):
if isinstance(self.vaxis_step, float):
return '%.2f' % value
if isinstance(self.vaxis_step, int):
return '%d' % value
return '%s' % value
def _hToString(self, value):
if isinstance(self.haxis_step, float):
return '%.2f' % value
if isinstance(self.haxis_step, int):
return '%d' % value
return '%s' % value
def _setupDefaultValues(self):
def _minMaxDelta(col):
vmin = None
vmax = None
vdelta = 0
ndelta = 1
last_value = self.data.rows[0][col]
vmin = vmax = last_value
for row in self.data.rows[1:]:
vdelta += abs(row[col] - last_value)
ndelta += 1
if row[col] > vmax:
vmax = row[col]
elif row[col] < vmin:
vmin = row[col]
return vmin, vmax, vdelta / ndelta
ref_min, ref_max, ref_step = _minMaxDelta(self._ref_col)
oth_min = oth_max = oth_step = None
for col in xrange(len(self.data.columns)):
if col == self._ref_col:
continue
cmin, cmax, cstep = _minMaxDelta(col)
oth_min = cmin if oth_min is None else min(cmin, oth_min)
oth_max = cmax if oth_max is None else max(cmax, oth_max)
oth_step = cstep if oth_step is None else (oth_step + cstep) / 2
if self._ref_isv:
if self.vaxis_vmin is None: self.vaxis_vmin = ref_min
if self.vaxis_vmax is None: self.vaxis_vmax = ref_max
if self.vaxis_step is None: self.vaxis_step = ref_step
if self.haxis_vmin is None: self.haxis_vmin = oth_min
if self.haxis_vmax is None: self.haxis_vmax = oth_max
if self.haxis_step is None: self.haxis_step = oth_step
else:
if self.haxis_vmin is None: self.haxis_vmin = ref_min
if self.haxis_vmax is None: self.haxis_vmax = ref_max
if self.haxis_step is None: self.haxis_step = ref_step
if self.vaxis_vmin is None: self.vaxis_vmin = oth_min
if self.vaxis_vmax is None: self.vaxis_vmax = oth_max
if self.vaxis_step is None: self.vaxis_step = oth_step
class LineChart(ScatterChart):
def _drawColumnData(self, painter, color, xcol, ycol, xmin, xmax, ymin, ymax):
painter.setPen(QPen(QColor(color), 2, Qt.SolidLine, Qt.RoundCap))
path = QPainterPath()
row = self.data.rows[0]
x, y = self._xyFromData(row[xcol], row[ycol], xmin, xmax, ymin, ymax)
path.moveTo(x, y)
for row in self.data.rows[1:]:
x, y = self._xyFromData(row[xcol], row[ycol], xmin, xmax, ymin, ymax)
path.lineTo(x, y)
painter.drawPath(path)
class AreaChart(ScatterChart):
def _drawColumnData(self, painter, color, xcol, ycol, xmin, xmax, ymin, ymax):
painter.setPen(QPen(QColor(color), 2, Qt.SolidLine, Qt.RoundCap))
color = QColor(color)
color.setAlpha(40)
painter.setBrush(color)
path = QPainterPath()
path.moveTo(xmin, ymax)
for row in self.data.rows:
x, y = self._xyFromData(row[xcol], row[ycol], xmin, xmax, ymin, ymax)
path.lineTo(x, y)
path.lineTo(xmax, ymax)
path.moveTo(xmin, ymax)
painter.drawPath(path)
class Viewer(QWidget):
def __init__(self):
QWidget.__init__(self)
self.graph = None
def setGraph(self, func):
self.graph = func
self.update()
def paintEvent(self, event):
painter = QPainter(self)
painter.setRenderHint(QPainter.Antialiasing)
if self.graph is not None:
self.graph.draw(painter, QRect(0, 0, event.rect().width() - 120, event.rect().height()))
self.graph.drawLegend(painter, QRect(event.rect().width() - 120, 20, 120, event.rect().height() - 20))
painter.end()
class DialogViewer(QDialog):
def __init__(self):
QDialog.__init__(self)
self.viewer = Viewer()
self.setLayout(QVBoxLayout())
self.layout().setContentsMargins(0, 0, 0, 0)
self.layout().addWidget(self.viewer)
def setGraph(self, func):
self.viewer.setGraph(func)
class DataTable(object):
def __init__(self):
self.columns = []
self.rows = []
def addColumn(self, label):
self.columns.append(label)
def addRow(self, row):
assert len(row) == len(self.columns)
self.rows.append(row)
def _pieChartDemo():
table = DataTable()
table.addColumn('Lang')
table.addColumn('Rating')
table.addRow(['Java', 17.874])
table.addRow(['C', 17.322])
table.addRow(['C++', 8.084])
table.addRow(['C#', 7.319])
table.addRow(['PHP', 6.096])
chart = PieChart(table)
#chart.save('pie.png', QSize(240, 240), 100)
view = DialogViewer()
view.setGraph(chart)
view.resize(360, 240)
view.exec_()
def _scatterChartDemo():
table = DataTable()
table.addColumn('Quality')
table.addColumn('Test 1')
table.addColumn('Test 2')
table.addRow([ 92, 4.9, 8.0])
table.addRow([ 94, 2.0, 2.5])
table.addRow([ 96, 7.2, 6.9])
table.addRow([ 98, 3.5, 1.2])
table.addRow([100, 8.0, 5.3])
table.addRow([102, 15.0, 14.2])
chart = ScatterChart(table)
chart.haxis_title = 'Process input'
chart.haxis_vmin = 0
chart.haxis_vmax = 16
chart.haxis_step = 2
chart.vaxis_title = 'Quality'
chart.vaxis_vmin = 90
chart.vaxis_vmax = 104
chart.vaxis_step = 1
#chart.save('scatter.png', QSize(400, 240), 100)
view = DialogViewer()
view.setGraph(chart)
view.resize(400, 240)
view.exec_()
def _lineChartDemo():
table = DataTable()
table.addColumn('Time')
table.addColumn('Site 1')
table.addColumn('Site 2')
table.addColumn('Site 3')
table.addRow([ 4.00, 120, 80, 400])
table.addRow([ 6.00, 270, 850, 320])
table.addRow([ 8.30, 50, 1200, 280])
table.addRow([10.15, 320, 1520, 510])
table.addRow([12.00, 150, 930, 1100])
table.addRow([18.20, 62, 1100, 240])
chart = LineChart(table)
chart.setHorizontalAxisColumn(0)
chart.haxis_title = 'Time'
chart.haxis_vmin = 0.0
chart.haxis_vmax = 20.0
chart.haxis_step = 2
#chart.save('line.png', QSize(400, 240), 100)
view = DialogViewer()
view.setGraph(chart)
view.resize(400, 240)
view.exec_()
def _areaChartDemo():
table = DataTable()
table.addColumn('Time')
table.addColumn('Site 1')
table.addColumn('Site 2')
table.addRow([ 4.00, 120, 500])
table.addRow([ 6.00, 270, 460])
table.addRow([ 8.30, 1260, 1120])
table.addRow([10.15, 2030, 540])
table.addRow([12.00, 520, 890])
table.addRow([18.20, 1862, 1500])
chart = AreaChart(table)
chart.setHorizontalAxisColumn(0)
chart.haxis_title = 'Time'
chart.haxis_vmin = 0.0
chart.haxis_vmax = 20.0
chart.haxis_step = 5
#chart.save('area.png', QSize(400, 240), 100)
view = DialogViewer()
view.setGraph(chart)
view.resize(400, 240)
view.exec_()
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
_pieChartDemo()
_scatterChartDemo()
_lineChartDemo()
_areaChartDemo()