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#!/usr/bin/python
import sys
import math
import numpy as np
from PyQt5 import Qwt
from PyQt5.QtCore import Qt, QSize, QRectF
from PyQt5.QtGui import QPen, QBrush, QPainter, QFont
from PyQt5.QtWidgets import QApplication, QFrame
Size = 27
CurvCnt = 6
xval = np.zeros(Size,float)
yval = np.zeros(Size,float)
xMap = Qwt.QwtScaleMap()
yMap = Qwt.QwtScaleMap()
class MainWin(QFrame):
def __init__(self):
QFrame.__init__(self)
self.d_curves = [None]*CurvCnt
xMap.setScaleInterval( -0.5, 10.5 )
yMap.setScaleInterval( -1.1, 1.1 )
# Frame style FIXME This doesn't seem to work properly
self.setFrameStyle( QFrame.Box | QFrame.Raised )
self.setLineWidth( 2 )
self.setMidLineWidth( 3 )
# Calculate values
for i in range(Size):
xval[i] = i * 10.0 / ( Size - 1.0 )
yval[i] = math.sin( xval[i] ) * math.cos( 2.0 * xval[i] )
# define curve styles
i = 0
self.d_curves[i] = Qwt.QwtPlotCurve()
self.d_curves[i].setSymbol( Qwt.QwtSymbol( Qwt.QwtSymbol.Cross, QBrush(Qt.NoBrush),
QPen( Qt.black ), QSize( 5, 5 ) ) )
self.d_curves[i].setPen( Qt.darkGreen )
self.d_curves[i].setStyle( Qwt.QwtPlotCurve.Lines )
self.d_curves[i].setCurveAttribute( Qwt.QwtPlotCurve.Fitted )
i += 1
self.d_curves[i] = Qwt.QwtPlotCurve()
self.d_curves[i].setSymbol( Qwt.QwtSymbol( Qwt.QwtSymbol.Ellipse, Qt.yellow,
QPen( Qt.blue ), QSize( 5, 5 ) ) )
self.d_curves[i].setPen( Qt.red )
self.d_curves[i].setStyle( Qwt.QwtPlotCurve.Sticks )
i += 1
self.d_curves[i] = Qwt.QwtPlotCurve()
self.d_curves[i].setPen( Qt.darkBlue )
self.d_curves[i].setStyle( Qwt.QwtPlotCurve.Lines )
i += 1
self.d_curves[i] = Qwt.QwtPlotCurve()
self.d_curves[i].setPen( Qt.darkBlue )
self.d_curves[i].setStyle( Qwt.QwtPlotCurve.Lines )
self.d_curves[i].setRenderHint( Qwt.QwtPlotItem.RenderAntialiased )
i += 1
self.d_curves[i] = Qwt.QwtPlotCurve()
self.d_curves[i].setPen( Qt.darkCyan )
self.d_curves[i].setStyle( Qwt.QwtPlotCurve.Steps )
i += 1
self.d_curves[i] = Qwt.QwtPlotCurve()
self.d_curves[i].setSymbol( Qwt.QwtSymbol( Qwt.QwtSymbol.XCross, QBrush(Qt.NoBrush),
QPen( Qt.darkMagenta ), QSize( 5, 5 ) ) )
self.d_curves[i].setStyle( Qwt.QwtPlotCurve.NoCurve )
# attach data
for i in range(CurvCnt):
self.d_curves[i].setSamples( xval, yval )
def shiftDown(self, rect, offset ):
rect.translate( 0, offset )
def paintEvent( self, event ):
#QFrame.paintEvent( event )
painter = QPainter( self )
painter.setClipRect( self.contentsRect() )
self.drawContents( painter )
# REDRAW CONTENTS
def drawContents( self, painter ):
r = self.contentsRect()
deltay = r.height() // CurvCnt - 1
r.setHeight( deltay )
# draw curves
for i in range( CurvCnt ):
xMap.setPaintInterval( r.left(), r.right() )
yMap.setPaintInterval( r.top(), r.bottom() )
painter.setRenderHint( QPainter.Antialiasing,
self.d_curves[i].testRenderHint( Qwt.QwtPlotItem.RenderAntialiased ) )
self.d_curves[i].draw( painter, xMap, yMap, QRectF(r) )
self.shiftDown( r, deltay )
# draw titles
r = self.contentsRect() # reset r
painter.setFont( QFont( "Helvetica", 8 ) )
alignment = Qt.AlignTop | Qt.AlignHCenter
painter.setPen( Qt.black )
painter.drawText( 0, r.top(), r.width(), painter.fontMetrics().height(),
alignment, "Style: Line/Fitted, Symbol: Cross" )
self.shiftDown( r, deltay )
painter.drawText( 0, r.top(), r.width(), painter.fontMetrics().height(),
alignment, "Style: Sticks, Symbol: Ellipse" )
self.shiftDown( r, deltay )
painter.drawText( 0 , r.top(), r.width(), painter.fontMetrics().height(),
alignment, "Style: Lines, Symbol: None" )
self.shiftDown( r, deltay )
painter.drawText( 0 , r.top(), r.width(), painter.fontMetrics().height(),
alignment, "Style: Lines, Symbol: None, Antialiased" )
self.shiftDown( r, deltay )
painter.drawText( 0, r.top(), r.width(), painter.fontMetrics().height(),
alignment, "Style: Steps, Symbol: None" )
self.shiftDown( r, deltay )
painter.drawText( 0, r.top(), r.width(), painter.fontMetrics().height(),
alignment, "Style: NoCurve, Symbol: XCross" )
if __name__ == '__main__':
a = QApplication(sys.argv)
a.setStyle( "Windows" )
w = MainWin()
w.resize( 300, 600 )
w.show()
sys.exit(a.exec_())
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