CurveDemo2.py

# -*- coding: utf-8 -*-
#
# Licensed under the terms of the PyQwt License
# Copyright (C) 2003-2009 Gerard Vermeulen, for the original PyQwt example
# Copyright (c) 2015 Pierre Raybaut, for the PyQt5/PySide port and further 
# developments (e.g. ported to PythonQwt API)
# (see LICENSE file for more details)

SHOW = True # Show test in GUI-based test launcher

import sys
import numpy as np

from qwt.qt.QtGui import (QApplication, QPen, QBrush, QFrame, QColor, QPainter,
                          QPalette)
from qwt.qt.QtCore import QSize
from qwt.qt.QtCore import Qt
from qwt import QwtScaleMap, QwtSymbol, QwtPlotCurve

Size = 15
USize = 13

class CurveDemo(QFrame):

    def __init__(self, *args):
        QFrame.__init__(self, *args)

        self.setFrameStyle(QFrame.Box | QFrame.Raised)
        self.setLineWidth(2)
        self.setMidLineWidth(3)

        p = QPalette()
        p.setColor(self.backgroundRole(), QColor(30, 30, 50))
        self.setPalette(p)
        # make curves and maps
        self.tuples = []
        # curve 1
        curve = QwtPlotCurve()
        curve.setPen(QPen(QColor(150, 150, 200), 2))
        curve.setStyle(QwtPlotCurve.Lines)
        curve.setSymbol(QwtSymbol(QwtSymbol.XCross,
                                      QBrush(),
                                      QPen(Qt.yellow, 2),
                                      QSize(7, 7)))
        self.tuples.append((curve,
                            QwtScaleMap(0, 100, -1.5, 1.5),
                            QwtScaleMap(0, 100, 0.0, 2*np.pi)))
        # curve 2
        curve = QwtPlotCurve()
        curve.setPen(QPen(QColor(200, 150, 50),
                                1,
                                Qt.DashDotDotLine))
        curve.setStyle(QwtPlotCurve.Sticks)
        curve.setSymbol(QwtSymbol(QwtSymbol.Ellipse,
                                      QBrush(Qt.blue),
                                      QPen(Qt.yellow),
                                      QSize(5, 5)))
        self.tuples.append((curve,
                            QwtScaleMap(0, 100, 0.0, 2*np.pi),
                            QwtScaleMap(0, 100, -3.0, 1.1)))
        # curve 3
        curve = QwtPlotCurve()
        curve.setPen(QPen(QColor(100, 200, 150)))
        curve.setStyle(QwtPlotCurve.Lines)
        self.tuples.append((curve,
                            QwtScaleMap(0, 100, -1.1, 3.0),
                            QwtScaleMap(0, 100, -1.1, 3.0)))
        # curve 4
        curve = QwtPlotCurve()
        curve.setPen(QPen(Qt.red))
        curve.setStyle(QwtPlotCurve.Lines)
        self.tuples.append((curve,
                            QwtScaleMap(0, 100, -5.0, 1.1),
                            QwtScaleMap(0, 100, -1.1, 5.0)))
        # data
        self.phase = 0.0
        self.base = np.arange(0.0, 2.01*np.pi, 2*np.pi/(USize-1))
        self.uval = np.cos(self.base)
        self.vval = np.sin(self.base)
        self.uval[1::2] *= 0.5
        self.vval[1::2] *= 0.5
        self.newValues()
        # start timer
        self.tid = self.startTimer(250)

    def paintEvent(self, event):
        QFrame.paintEvent(self,event)
        painter = QPainter(self)
        painter.setClipRect(self.contentsRect())
        self.drawContents(painter)

    def drawContents(self, painter):
        r = self.contentsRect()
        for curve, xMap, yMap in self.tuples:
            xMap.setPaintInterval(r.left(), r.right())
            yMap.setPaintInterval(r.top(), r.bottom())
            curve.draw(painter, xMap, yMap, r)

    def timerEvent(self, event):
        self.newValues()
        self.repaint()
        
    def newValues(self):
        phase = self.phase
        
        self.xval = np.arange(0, 2.01*np.pi, 2*np.pi/(Size-1))
        self.yval = np.sin(self.xval - phase)
        self.zval = np.cos(3*(self.xval + phase))
    
        s = 0.25 * np.sin(phase)
        c = np.sqrt(1.0 - s*s)
        u = self.uval
        self.uval = c*self.uval-s*self.vval
        self.vval = c*self.vval+s*u

        self.tuples[0][0].setData(self.yval, self.xval)
        self.tuples[1][0].setData(self.xval, self.zval)
        self.tuples[2][0].setData(self.yval, self.zval)
        self.tuples[3][0].setData(self.uval, self.vval)
        
        self.phase += 2*np.pi/100
        if self.phase>2*np.pi:
            self.phase = 0.0


def make():
    demo = CurveDemo()
    demo.resize(600, 600)
    demo.show()
    return demo


if __name__ == '__main__':
    app = QApplication(sys.argv)
    demo = make()
    sys.exit(app.exec_())