pyqt example scanitem (snippet)

Python pyqt (gui) example 'scanitem'

scanitem

Python pyqt example: scanitem

#############################################################################
##
## Copyright (C) 2013 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:LGPL$
## Commercial Usage
## Licensees holding valid Qt Commercial licenses may use this file in
## accordance with the Qt Commercial License Agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and Nokia.
##
## GNU Lesser General Public License Usage
## Alternatively, this file may be used under the terms of the GNU Lesser
## General Public License version 2.1 as published by the Free Software
## Foundation and appearing in the file LICENSE.LGPL included in the
## packaging of this file.  Please review the following information to
## ensure the GNU Lesser General Public License version 2.1 requirements
## will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
##
## In addition, as a special exception, Nokia gives you certain additional
## rights.  These rights are described in the Nokia Qt LGPL Exception
## version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
##
## GNU General Public License Usage
## Alternatively, this file may be used under the terms of the GNU
## General Public License version 3.0 as published by the Free Software
## Foundation and appearing in the file LICENSE.GPL included in the
## packaging of this file.  Please review the following information to
## ensure the GNU General Public License version 3.0 requirements will be
## met: http://www.gnu.org/copyleft/gpl.html.
##
## If you have questions regarding the use of this file, please contact
## Nokia at [email protected].
## $QT_END_LICENSE$
##
#############################################################################


from PyQt5.QtCore import QRect
from PyQt5.QtGui import QColor, QImage, QPainter, QPen

from colors import Colors
from demoitem import DemoItem


class ScanItem(DemoItem):
    ITEM_WIDTH = 16
    ITEM_HEIGHT = 16

    def __init__(self, parent=None):
        super(ScanItem, self).__init__(parent)

        self.useSharedImage(__file__)

    def createImage(self, transform):
        scaledRect = transform.mapRect(QRect(0, 0, ScanItem.ITEM_WIDTH, ScanItem.ITEM_HEIGHT))
        image = QImage(scaledRect.width(), scaledRect.height(),
                QImage.Format_ARGB32_Premultiplied)
        image.fill(QColor(0, 0, 0, 0).rgba())
        painter = QPainter(image)
        painter.setRenderHint(QPainter.Antialiasing)

        if Colors.useEightBitPalette:
            painter.setPen(QPen(QColor(100, 100, 100), 2))
            painter.setBrush(QColor(206, 246, 117))
            painter.drawEllipse(1, 1, scaledRect.width() - 2,
                    scaledRect.height() - 2)
        else:
            painter.setPen(QPen(QColor(0, 0, 0, 15), 1))
            painter.setBrush(QColor(0, 0, 0, 15))
            painter.drawEllipse(1, 1, scaledRect.width() - 2,
                    scaledRect.height() - 2)

        return image

Useful links

• Learn PyQt: https://pythonbasics.org/pyqt-hello-world/
• Install PyQt: https://pythonbasics.org/install-pyqt/