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#!/usr/bin/python3
import sys
import random
from PyQt5 import Qwt
from PyQt5.QtCore import Qt, QSize
from PyQt5.QtGui import QPalette, QColor
from PyQt5.QtWidgets import QApplication, QMainWindow, QToolBar, QComboBox, QSizePolicy, QToolButton
colours={"DarkOrchid":QColor(153, 50, 204),
"Gold":QColor(255, 215, 0),
"LemonChiffon":QColor(255, 250, 205),
"SteelBlue":QColor( 70, 130, 180) }
class BarChart( Qwt.QwtPlot ):
def __init__(self, parent):
Qwt.QwtPlot.__init__(self, parent)
self.setAutoFillBackground( True )
self.setPalette( QPalette(Qt.white) )
self.canvas().setPalette( QPalette( colours["LemonChiffon"]))
self.setTitle( "Bar Chart" )
self.setAxisTitle( Qwt.QwtPlot.yLeft, "Whatever" )
self.setAxisTitle( Qwt.QwtPlot.xBottom, "Whatever" )
self.d_barChartItem = Qwt.QwtPlotMultiBarChart( "Bar Chart" )
self.d_barChartItem.setLayoutPolicy( Qwt.QwtPlotMultiBarChart.AutoAdjustSamples )
self.d_barChartItem.setSpacing( 20 )
self.d_barChartItem.setMargin( 3 )
self.d_barChartItem.attach( self )
self.insertLegend( Qwt.QwtLegend() )
self.populate()
self.setOrientation( 0 )
self.setAutoReplot( True )
def populate(self):
colors = [colours["DarkOrchid"], colours["SteelBlue"], colours["Gold"]]
numSamples = 5
numBars = len(colors )
titles = []
for i in range(numBars):
titles.append(Qwt.QwtText("Bar %d"%i))
self.d_barChartItem.setBarTitles( titles )
self.d_barChartItem.setLegendIconSize( QSize( 10, 14 ) )
for i in range(numBars):
symbol = Qwt.QwtColumnSymbol( Qwt.QwtColumnSymbol.Box )
symbol.setLineWidth( 2 )
symbol.setFrameStyle( Qwt.QwtColumnSymbol.Raised )
symbol.setPalette( QPalette( colors[i] ) )
self.d_barChartItem.setSymbol( i, symbol )
self.series = []
for i in range(numSamples):
values = []
for j in range(numBars):
values.append( 2.0 + random.randint(0, 8) % 8 )
self.series.append(values)
print(self.series)
self.d_barChartItem.setSamples( self.series )
def setMode( self, mode ):
if ( mode == 0 ):
self.d_barChartItem.setStyle( Qwt.QwtPlotMultiBarChart.Grouped )
else:
self.d_barChartItem.setStyle( Qwt.QwtPlotMultiBarChart.Stacked )
def setOrientation( self, orientation ):
axis1 = Qwt.QwtPlot.Axis()
axis2 = Qwt.QwtPlot.Axis()
if ( orientation == 0 ):
axis1 = Qwt.QwtPlot.xBottom
axis2 = Qwt.QwtPlot.yLeft
self.d_barChartItem.setOrientation( Qt.Vertical )
else:
axis1 = Qwt.QwtPlot.yLeft
axis2 = Qwt.QwtPlot.xBottom
self.d_barChartItem.setOrientation( Qt.Horizontal )
self.setAxisScale( axis1, 0, len(self.series) -1, 1.0 )
self.setAxisAutoScale( axis2 )
self.scaleDraw1 = self.axisScaleDraw( axis1 )
self.scaleDraw1.enableComponent( Qwt.QwtScaleDraw.Backbone, False )
self.scaleDraw1.enableComponent( Qwt.QwtScaleDraw.Ticks, False )
self.scaleDraw2 = self.axisScaleDraw( axis2 )
self.scaleDraw2.enableComponent( Qwt.QwtScaleDraw.Backbone, True )
self.scaleDraw2.enableComponent( Qwt.QwtScaleDraw.Ticks, True )
self.plotLayout().setAlignCanvasToScale( axis1, True )
self.plotLayout().setAlignCanvasToScale( axis2, False )
self.plotLayout().setCanvasMargin( 0 )
self.updateCanvasMargins()
self.replot()
def exportChart(self):
renderer = Qwt.QwtPlotRenderer()
renderer.exportTo( self, "barchart.pdf" )
class MainWindow(QMainWindow):
def __init__(self, parent=None):
QMainWindow.__init__(self, parent)
self.d_chart = BarChart( self )
self.setCentralWidget( self.d_chart )
self.toolBar = QToolBar( self )
self.typeBox = QComboBox( self.toolBar )
self.typeBox.addItem( "Grouped" )
self.typeBox.addItem( "Stacked" )
self.typeBox.setSizePolicy( QSizePolicy.Fixed, QSizePolicy.Fixed )
self.orientationBox = QComboBox( self.toolBar )
self.orientationBox.addItem( "Vertical" )
self.orientationBox.addItem( "Horizontal" )
self.orientationBox.setSizePolicy( QSizePolicy.Fixed, QSizePolicy.Fixed )
self.btnExport = QToolButton(self.toolBar )
self.btnExport.setText( "Export" )
self.btnExport.setToolButtonStyle( Qt.ToolButtonTextUnderIcon )
self.btnExport.clicked.connect(self.d_chart.exportChart)
self.toolBar.addWidget( self.typeBox )
self.toolBar.addWidget( self.orientationBox )
self.toolBar.addWidget( self.btnExport )
self.addToolBar( self.toolBar )
self.d_chart.setMode( self.typeBox.currentIndex() )
self.typeBox.currentIndexChanged['int'].connect(self.d_chart.setMode )
self.d_chart.setOrientation( self.orientationBox.currentIndex() )
self.orientationBox.currentIndexChanged['int'].connect(self.d_chart.setOrientation)
a = QApplication(sys.argv)
m = MainWindow()
m.resize( 600, 400 )
m.show()
sys.exit(a.exec_())
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