def __init__(self, parent=None):
Qwt.QwtPlot.__init__(self, parent )
self.grid=None
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" )
self.legend = Qwt.QwtLegend()
self.legend.setDefaultItemMode( Qwt.QwtLegendData.Checkable )
self.insertLegend( self.legend, Qwt.QwtPlot.RightLegend )
self.populate()
self.legend.checked['QVariant','bool','int'].connect(self.showItem )
self.replot() # creating the legend items
"""self.items = Qwt.QwtPlotDict.itemList( Qwt.QwtPlotItem.Rtti_PlotHistogram )
for i in range(len(self.items)):
if ( i == 0 ):
#const QVariant
itemInfo = 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 __init__(self, parent=None):
Qwt.QwtPlot.__init__(self, parent)
self.setAutoReplot(False)
self.setTitle("Frequency Response of a Second-Order System")
canvas = Qwt.QwtPlotCanvas()
canvas.setBorderRadius(10)
self.setCanvas(canvas)
self.setCanvasBackground(QColor("MidnightBlue"))
# legend
legend = Qwt.QwtLegend()
self.insertLegend(legend, Qwt.QwtPlot.BottomLegend)
# grid
grid = Qwt.QwtPlotGrid()
grid.enableXMin(True)
grid.setMajorPen(Qt.white, 0, Qt.DotLine)
grid.setMinorPen(Qt.gray, 0, Qt.DotLine)
grid.attach(self)
# axes
self.enableAxis(Qwt.QwtPlot.yRight)
self.setAxisTitle(Qwt.QwtPlot.xBottom, "Normalized Frequency")
self.setAxisTitle(Qwt.QwtPlot.yLeft, "Amplitude [dB]")
self.setAxisTitle(Qwt.QwtPlot.yRight, "Phase [deg]")
self.setAxisMaxMajor(Qwt.QwtPlot.xBottom, 6)
self.setAxisMaxMinor(Qwt.QwtPlot.xBottom, 9)
self.setAxisScaleEngine(Qwt.QwtPlot.xBottom, Qwt.QwtLogScaleEngine())
# curves
self.d_curve1 = Qwt.QwtPlotCurve("Amplitude")
self.d_curve1.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
self.d_curve1.setPen(Qt.yellow)
self.d_curve1.setLegendAttribute(Qwt.QwtPlotCurve.LegendShowLine)
self.d_curve1.setYAxis(Qwt.QwtPlot.yLeft)
self.d_curve1.attach(self)
self.d_curve2 = Qwt.QwtPlotCurve("Phase")
self.d_curve2.setRenderHint(Qwt.QwtPlotItem.RenderAntialiased)
self.d_curve2.setPen(Qt.cyan)
self.d_curve2.setLegendAttribute(Qwt.QwtPlotCurve.LegendShowLine)
self.d_curve2.setYAxis(Qwt.QwtPlot.yRight)
self.d_curve2.attach(self)
# marker
self.d_marker1 = Qwt.QwtPlotMarker()
self.d_marker1.setValue(0.0, 0.0)
self.d_marker1.setLineStyle(Qwt.QwtPlotMarker.VLine)
self.d_marker1.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
self.d_marker1.setLinePen(Qt.green, 0, Qt.DashDotLine)
self.d_marker1.attach(self)
self.d_marker2 = Qwt.QwtPlotMarker()
self.d_marker2.setLineStyle(Qwt.QwtPlotMarker.HLine)
self.d_marker2.setLabelAlignment(Qt.AlignRight | Qt.AlignBottom)
self.d_marker2.setLinePen(QColor(200, 150, 0), 0, Qt.DashDotLine)
self.d_marker2.setSymbol(
Qwt.QwtSymbol(Qwt.QwtSymbol.Diamond, QColor(Qt.yellow),
QColor(Qt.green), QSize(8, 8)))
self.d_marker2.attach(self)
self.setDamp(0)
self.setAutoReplot(True)
def updateCurves(self):
speed = 2 * 3.14159 / 25000.0 # a cycle every 25 seconds
phase = self.d_time.elapsed() * speed
for i in range(len(self.d_curves)):
self.d_curves[i].updateSamples( phase )
#QApplication a( argc, argv );
if __name__ == '__main__':
a = QApplication(sys.argv)
plot = Plot()
#if USE_OPENGL
#canvas = Qwt.QwtPlotGLCanvas()
#canvas.setFrameStyle( Qwt.QwtPlotGLCanvas.NoFrame )
#else
canvas = Qwt.QwtPlotCanvas();
canvas.setFrameStyle( QFrame.NoFrame );
canvas.setPaintAttribute( Qwt.QwtPlotCanvas.BackingStore, False )
#endif
plot.setCanvas( canvas )
plot.setCanvasBackground( QColor( 30, 30, 50 ) )
plot.resize( 400, 400 )
plot.show()
sys.exit(a.exec_())