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# -*- 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 numpy as np
from qtpy.QtWidgets import QFrame
from qtpy.QtGui import QPen, QBrush, QFont, QPainter
from qtpy.QtCore import QSize, Qt
from qwt import QwtSymbol, QwtPlotCurve, QwtPlotItem, QwtScaleMap
class CurveDemo1(QFrame):
def __init__(self, *args):
QFrame.__init__(self, *args)
self.xMap = QwtScaleMap()
self.xMap.setScaleInterval(-0.5, 10.5)
self.yMap = QwtScaleMap()
self.yMap.setScaleInterval(-1.1, 1.1)
# frame style
self.setFrameStyle(QFrame.Box | QFrame.Raised)
self.setLineWidth(2)
self.setMidLineWidth(3)
# calculate values
self.x = np.arange(0, 10.0, 10.0 / 27)
self.y = np.sin(self.x) * np.cos(2 * self.x)
# make curves with different styles
self.curves = []
self.titles = []
# curve 1
self.titles.append("Style: Sticks, Symbol: Ellipse")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.red))
curve.setStyle(QwtPlotCurve.Sticks)
curve.setSymbol(
QwtSymbol(QwtSymbol.Ellipse, QBrush(Qt.yellow), QPen(Qt.blue), QSize(5, 5))
)
self.curves.append(curve)
# curve 2
self.titles.append("Style: Lines, Symbol: None")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkBlue))
curve.setStyle(QwtPlotCurve.Lines)
self.curves.append(curve)
# curve 3
self.titles.append("Style: Lines, Symbol: None, Antialiased")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkBlue))
curve.setStyle(QwtPlotCurve.Lines)
curve.setRenderHint(QwtPlotItem.RenderAntialiased)
self.curves.append(curve)
# curve 4
self.titles.append("Style: Steps, Symbol: None")
curve = QwtPlotCurve()
curve.setPen(QPen(Qt.darkCyan))
curve.setStyle(QwtPlotCurve.Steps)
self.curves.append(curve)
# curve 5
self.titles.append("Style: NoCurve, Symbol: XCross")
curve = QwtPlotCurve()
curve.setStyle(QwtPlotCurve.NoCurve)
curve.setSymbol(
QwtSymbol(QwtSymbol.XCross, QBrush(), QPen(Qt.darkMagenta), QSize(5, 5))
)
self.curves.append(curve)
# attach data, using Numeric
for curve in self.curves:
curve.setData(self.x, self.y)
def shiftDown(self, rect, offset):
rect.translate(0, offset)
def paintEvent(self, event):
QFrame.paintEvent(self, event)
painter = QPainter(self)
painter.setClipRect(self.contentsRect())
self.drawContents(painter)
def drawContents(self, painter):
# draw curves
r = self.contentsRect()
dy = int(r.height() / len(self.curves))
r.setHeight(dy)
for curve in self.curves:
self.xMap.setPaintInterval(r.left(), r.right())
self.yMap.setPaintInterval(r.top(), r.bottom())
painter.setRenderHint(
QPainter.Antialiasing,
curve.testRenderHint(QwtPlotItem.RenderAntialiased),
)
curve.draw(painter, self.xMap, self.yMap, r)
self.shiftDown(r, dy)
# draw titles
r = self.contentsRect()
r.setHeight(dy)
painter.setFont(QFont("Helvetica", 8))
painter.setPen(Qt.black)
for title in self.titles:
painter.drawText(
0,
r.top(),
r.width(),
painter.fontMetrics().height(),
Qt.AlignTop | Qt.AlignHCenter,
title,
)
self.shiftDown(r, dy)
if __name__ == "__main__":
from qwt import tests
tests.test_widget(CurveDemo1, size=(300, 600), options=False)
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