Curve demo 1

import numpy as np
from qtpy.QtCore import QSize, Qt
from qtpy.QtGui import QBrush, QFont, QPainter, QPen
from qtpy.QtWidgets import QFrame

from qwt import QwtPlotCurve, QwtPlotItem, QwtScaleMap, QwtSymbol
from qwt.tests import utils


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)


def test_curvedemo1():
    """Curve demo 1"""
    utils.test_widget(CurveDemo1, size=(300, 600), options=False)


if __name__ == "__main__":
    test_curvedemo1()