examples/opengl/2dpainting.py

#!/usr/bin/env python


#############################################################################
##
## Copyright (C) 2015 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
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## This file is part of the examples of PyQt.
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##   * Redistributions in binary form must reproduce the above copyright
##     notice, this list of conditions and the following disclaimer in
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##     the names of its contributors may be used to endorse or promote
##     products derived from this software without specific prior written
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#############################################################################


import sys
import math

from PyQt5.QtCore import QPointF, QRect, QRectF, Qt, QTimer
from PyQt5.QtGui import (QBrush, QColor, QFont, QLinearGradient, QPainter,
        QPen, QSurfaceFormat)
from PyQt5.QtWidgets import (QApplication, QGridLayout, QLabel, QOpenGLWidget,
        QWidget)


class Helper(object):
    def __init__(self):
        gradient = QLinearGradient(QPointF(50, -20), QPointF(80, 20))
        gradient.setColorAt(0.0, Qt.white)
        gradient.setColorAt(1.0, QColor(0xa6, 0xce, 0x39))

        self.background = QBrush(QColor(64, 32, 64))
        self.circleBrush = QBrush(gradient)
        self.circlePen = QPen(Qt.black)
        self.circlePen.setWidth(1)
        self.textPen = QPen(Qt.white)
        self.textFont = QFont()
        self.textFont.setPixelSize(50)

    def paint(self, painter, event, elapsed):
        painter.fillRect(event.rect(), self.background)
        painter.translate(100, 100)

        painter.save()
        painter.setBrush(self.circleBrush)
        painter.setPen(self.circlePen)
        painter.rotate(elapsed * 0.030)

        r = elapsed / 1000.0
        n = 30
        for i in range(n):
            painter.rotate(30)
            radius = 0 + 120.0*((i+r)/n)
            circleRadius = 1 + ((i+r)/n)*20
            painter.drawEllipse(QRectF(radius, -circleRadius,
                    circleRadius*2, circleRadius*2))

        painter.restore()

        painter.setPen(self.textPen)
        painter.setFont(self.textFont)
        painter.drawText(QRect(-50, -50, 100, 100), Qt.AlignCenter, "Qt")


class Widget(QWidget):
    def __init__(self, helper, parent):
        super(Widget, self).__init__(parent)

        self.helper = helper
        self.elapsed = 0
        self.setFixedSize(200, 200)

    def animate(self):
        self.elapsed = (self.elapsed + self.sender().interval()) % 1000
        self.repaint()

    def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self)
        painter.setRenderHint(QPainter.Antialiasing)
        self.helper.paint(painter, event, self.elapsed)
        painter.end()


class GLWidget(QOpenGLWidget):
    def __init__(self, helper, parent):
        super(GLWidget, self).__init__(parent)

        self.helper = helper
        self.elapsed = 0
        self.setFixedSize(200, 200)
        self.setAutoFillBackground(False)

    def animate(self):
        self.elapsed = (self.elapsed + self.sender().interval()) % 1000
        self.update()

    def paintEvent(self, event):
        painter = QPainter()
        painter.begin(self)
        painter.setRenderHint(QPainter.Antialiasing)
        self.helper.paint(painter, event, self.elapsed)
        painter.end()


class Window(QWidget):
    def __init__(self):
        super(Window, self).__init__()

        self.setWindowTitle("2D Painting on Native and OpenGL Widgets")

        helper = Helper()
        native = Widget(helper, self)
        openGL = GLWidget(helper, self)
        nativeLabel = QLabel("Native")
        nativeLabel.setAlignment(Qt.AlignHCenter)
        openGLLabel = QLabel("OpenGL")
        openGLLabel.setAlignment(Qt.AlignHCenter)

        layout = QGridLayout()
        layout.addWidget(native, 0, 0)
        layout.addWidget(openGL, 0, 1)
        layout.addWidget(nativeLabel, 1, 0)
        layout.addWidget(openGLLabel, 1, 1)
        self.setLayout(layout)

        timer = QTimer(self)
        timer.timeout.connect(native.animate)
        timer.timeout.connect(openGL.animate)
        timer.start(50)


if __name__ == '__main__':

    app = QApplication(sys.argv)

    fmt = QSurfaceFormat()
    fmt.setSamples(4)
    QSurfaceFormat.setDefaultFormat(fmt)

    window = Window()
    window.show()
    sys.exit(app.exec_())