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#!/usr/bin/python
import sys
from PyQt5 import Qwt
from PyQt5.QtCore import Qt, QSize
from PyQt5.QtGui import QColor, QPixmap, QFont, QBrush, QPalette, QPen
from PyQt5.QtWidgets import (QMainWindow, QWidget, QToolBar, QToolButton, QHBoxLayout, QLabel, QApplication, QComboBox, QSizePolicy)
class Histogram(Qwt.QwtPlotHistogram):
def __init__(self,title, symbolColor ):
Qwt.QwtPlotHistogram.__init__(self,title)
self.setStyle( Qwt.QwtPlotHistogram.Columns )
self.setColor( symbolColor )
def setValues(self, values ):
numValues = len(values)
#QVector<QwtIntervalSample> samples( numValues )
samples = []
for i in range(numValues):
interval = Qwt.QwtInterval( i , i + 1.0 )
interval.setBorderFlags( Qwt.QwtInterval.ExcludeMaximum )
samples.append(Qwt.QwtIntervalSample( values[i], interval ))
self.setSamples( samples )
def setColor(self, color ):
c = QColor(color)
c.setAlpha( 180 )
self.setBrush( QBrush( c ) )
class TVPlot( Qwt.QwtPlot):
def __init__(self, parent=None):
Qwt.QwtPlot.__init__(self, parent )
self.setTitle( "Watching TV during a weekend" )
canvas = Qwt.QwtPlotCanvas()
canvas.setPalette( QPalette(Qt.gray) )
canvas.setBorderRadius( 10 )
self.setCanvas( canvas )
self.plotLayout().setAlignCanvasToScales( True )
self.setAxisTitle( Qwt.QwtPlot.yLeft, "Number of People" )
self.setAxisTitle( Qwt.QwtPlot.xBottom, "Number of Hours" )
legend = Qwt.QwtLegend()
legend.setDefaultItemMode( Qwt.QwtLegendData.Checkable )
self.insertLegend( legend, Qwt.QwtPlot.RightLegend )
self.populate()
#connect( legend, SIGNAL( checked( const QVariant &, bool, int ) ), SLOT( showItem( const QVariant &, bool ) ) );
legend.checked['QVariant','bool','int'].connect(self.showItem )
self.replot() # creating the legend items
self.items = self.itemList( Qwt.QwtPlotItem.Rtti_PlotHistogram )
for i in range(len(self.items)):
if ( i == 0 ):
#const QVariant
itemInfo = self.itemToInfo( self.items[i] )
#QwtLegendLabel *
legendLabel = legend.legendWidget( itemInfo )
if ( legendLabel ):
legendLabel.setChecked( True )
self.items[i].setVisible( True )
else:
self.items[i].setVisible( False )
self.setAutoReplot( True )
def populate(self):
grid = Qwt.QwtPlotGrid()
grid.enableX( False )
grid.enableY( True )
grid.enableXMin( False )
grid.enableYMin( False )
grid.setMajorPen( Qt.black, 0, Qt.DotLine )
grid.attach( self )
juneValues = [ 7.0, 19.0, 24.0, 32.0, 10.0, 5.0, 3.0 ]
novemberValues = [ 4.0, 15.0, 22.0, 34.0, 13.0, 8.0, 4.0 ]
histogramJune = Histogram( "Summer", Qt.red )
histogramJune.setValues( juneValues )
histogramJune.attach( self )
histogramNovember = Histogram( "Winter", Qt.blue )
histogramNovember.setValues( novemberValues )
histogramNovember.attach( self )
def exportPlot(self):
print("Export Plot")
#renderer = Qwt.QwtPlotRenderer()
#renderer.exportTo( self, "tvplot.pdf" )
def setMode( self, mode):
#QwtPlotItemList
#print("Set mode %d"%mode)
items = self.itemList( Qwt.QwtPlotItem.Rtti_PlotHistogram )
for i in range(len(items)):
histogram = items[i]
if ( mode < 3 ):
histogram.setStyle(mode)
histogram.setSymbol( None)
pen = QPen( Qt.black, 0 )
if ( mode == Qwt.QwtPlotHistogram.Lines ):
pen.setBrush( histogram.brush() )
histogram.setPen( pen )
else:
histogram.setStyle( Qwt.QwtPlotHistogram.Columns )
symbol = Qwt.QwtColumnSymbol( Qwt.QwtColumnSymbol.Box )
symbol.setFrameStyle( Qwt.QwtColumnSymbol.Raised )
symbol.setLineWidth( 2 )
symbol.setPalette( QPalette( histogram.brush().color() ) )
histogram.setSymbol( symbol )
def showItem( self, plotItem, on ):
plotItem.setVisible( on )
class MainWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.d_plot = TVPlot(self)
self.setCentralWidget( self.d_plot )
self.toolBar = QToolBar( self )
self.typeBox = QComboBox( self.toolBar )
self.typeBox.addItem( "Outline" )
self.typeBox.addItem( "Columns" )
self.typeBox.addItem( "Lines" )
self.typeBox.addItem( "Column Symbol" )
self.typeBox.setCurrentIndex( self.typeBox.count() - 1 )
self.typeBox.setSizePolicy( QSizePolicy.Fixed, QSizePolicy.Fixed )
self.btnExport = QToolButton( self.toolBar )
self.btnExport.setText( "Export" )
self.btnExport.setToolButtonStyle( Qt.ToolButtonTextUnderIcon )
#connect( btnExport, SIGNAL( clicked() ), d_plot, SLOT( exportPlot() ) )
self.btnExport.clicked.connect(self.d_plot.exportPlot)
self.toolBar.addWidget( self.typeBox )
self.toolBar.addWidget( self.btnExport )
self.addToolBar( self.toolBar )
self.d_plot.setMode( self.typeBox.currentIndex() )
self.typeBox.currentIndexChanged['int'].connect(self.d_plot.setMode)
a = QApplication(sys.argv)
mainWindow = MainWindow()
mainWindow.resize( 600, 400 )
mainWindow.show()
sys.exit(a.exec_())
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