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#############################################################################
##
## Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
## Contact: Qt Software Information (qt-info@nokia.com)
##
## This file is part of the Graphics Dojo project on Qt Labs.
##
## This file may be used under the terms of the GNU General Public
## License version 2.0 or 3.0 as published by the Free Software Foundation
## and appearing in the file LICENSE.GPL included in the packaging of
## this file. Please review the following information to ensure GNU
## General Public Licensing requirements will be met:
## http:#www.fsf.org/licensing/licenses/info/GPLv2.html and
## http:#www.gnu.org/copyleft/gpl.html.
##
## If you are unsure which license is appropriate for your use, please
## contact the sales department at qt-sales@nokia.com.
##
## This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
## WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
##
#############################################################################
import sys
from PyQt4.QtCore import QPointF, QSize, Qt
from PyQt4.QtGui import *
class BarChart(QWidget):
def __init__(self, parent = None):
QWidget.__init__(self, parent)
self.suffix = ""
def showEvent(self, event):
# find the maximum value and widest (pixel-wise) label and suffix
fm = QFontMetrics(self.font())
self.margin = 20
self.titleHeight = fm.height()
self.barHeight = 1.5 * fm.height()
self.barSpacing = 0.6 * fm.height()
self.maxValue = self.suffixWidth = self.labelWidth = 0
count = 0
for key, value in self.data.items():
self.labelWidth = max(self.labelWidth, fm.width(key))
self.maxValue = max(self.maxValue, value)
self.suffixWidth = max(self.suffixWidth, fm.width(str(value) + " " + self.suffix))
count += 1
self.startHue = 15
self.hueDelta = 360 / count
self.resize(QSize(640, self.titleHeight + 2 * self.margin + (self.barHeight + self.barSpacing) * count))
def paintEvent(self, event):
p = QPainter()
p.begin(self)
# background and title
p.fillRect(self.rect(), QBrush(QColor(255, 255, 255)))
p.drawText(0, 0, self.width(), self.margin + self.titleHeight, Qt.AlignCenter, self.windowTitle())
ofs = self.labelWidth + self.margin
ww = self.width() - self.suffixWidth - ofs - 2 * self.margin
hue = self.startHue
y = 0
p.translate(self.margin, self.titleHeight + 1.5 * self.margin)
for key, value in self.data.items():
# label on the left side
p.setPen(QColor(Qt.black))
p.drawText(0, y, self.labelWidth, self.barHeight, Qt.AlignVCenter + Qt.AlignRight, key)
# the colored bar
gradient = QLinearGradient(QPointF(ofs, y), QPointF(ofs, y + self.barHeight))
gradient.setColorAt(0, QColor.fromHsv(hue, 255, 240))
gradient.setColorAt(1, QColor.fromHsv(hue, 255, 92))
p.setBrush(QBrush(gradient))
p.setPen(QColor(96, 96, 96))
bw = value * ww / self.maxValue
p.drawRect(ofs, y, bw, self.barHeight)
# extra text at the end of the bar
text = str(value) + " " + self.suffix
p.setPen(QColor(Qt.black))
p.drawText(ofs + bw + self.margin/2, y, self.suffixWidth, self.barHeight, Qt.AlignVCenter + Qt.AlignLeft, text)
# for the next bar
y += (self.barHeight + self.barSpacing)
hue += self.hueDelta
if hue >= 360:
hue -= 360
p.end()
def wheelEvent(self, event):
self.startHue += event.delta() / 8 / 5
if self.startHue >= 360:
self.startHue -= 360
if self.startHue < 0:
self.startHue += 360
self.update()
event.ignore()
def mousePressEvent(self, event):
fname = QFileDialog.getSaveFileName(self, "Save", ".", "*.png", 0, 0)
if fname.length > 0:
img = QImage(self.size(), QImage.Format_ARGB32_Premultiplied)
self.render(img)
img.save(QFile(fname))
if __name__ == "__main__":
app = QApplication(sys.argv)
chart = BarChart()
chart.setWindowTitle("SquirrelFish Performance")
chart.suffix = "runs"
chart.data = {"WebKit 3.0" : 5.4,
"WebKit 3.1" : 18.8,
"SquirrelFish" : 29.9,
"SquirrelFish Extreme" : 63.6}
chart.show()
sys.exit(app.exec_())
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