#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
## Contact: http://www.qt-project.org/legal
##
## This file is part of the documentation of the Qt Toolkit.
##
## $QT_BEGIN_LICENSE:LGPL21$
## Commercial License Usage
## Licensees holding valid commercial Qt licenses may use this file in
## accordance with the commercial license agreement provided with the
## Software or, alternatively, in accordance with the terms contained in
## a written agreement between you and Digia. For licensing terms and
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## use the contact form at http://qt.digia.com/contact-us.
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## 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 or version 3 as published by the Free
## Software Foundation and appearing in the file LICENSE.LGPLv21 and
## LICENSE.LGPLv3 included in the packaging of this file. Please review the
## following information to ensure the GNU Lesser General Public License
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## In addition, as a special exception, Digia gives you certain additional
## rights. These rights are described in the Digia Qt LGPL Exception
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#############################################################################

import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtSvg import QSvgGenerator

if __name__ == "__main__":

    app = QApplication(sys.argv)

    #device = QSvgGenerator()
    #device.setFileName("qpen-dashpattern.svg")
    #device.setSize(QSize(216, 144))
    #device.setResolution(72)

    device = QImage(192, 144, QImage.Format_ARGB32)
    device.fill(qRgba(0, 0, 0, 0))

    #resolution = device.resolution() # dpi
    #dpp = resolution / 72.0

    p = QPainter()
    p.begin(device)

    width = 8

    pen = QPen()
    pen.setWidth(width)
    pen.setDashPattern([4, 2])
    pen.setCapStyle(Qt.FlatCap)

    faded_pen = QPen()
    faded_pen.setWidth(width)
    faded_pen.setDashPattern([4, 2])
    faded_pen.setColor(QColor(160, 160, 160))
    faded_pen.setCapStyle(Qt.FlatCap)

    font = QFont("Monospace")
    font.setPointSize(12)
    p.setFont(font)
    p.setBrush(QColor(160, 0, 0))

    for x in range(-6, 9):

        if x % 4 == 0:
            length = 6
        else:
            length = 2

        p.drawLine(64 + x * width, 4, 64 + x * width, 4 + length)
        p.drawLine(64 + x * width, 136, 64 + x * width, 136 - length)

    offsets = (0, 2, 3.5, 4, 5, 6)
    for i in range(len(offsets)):

        offset = offsets[i]
        pen.setDashOffset(offset)

        p.setPen(faded_pen)
        p.drawLine(64 - offset * width, 20 + (i * 20), 64, 20 + (i * 20))

        p.setPen(pen)
        p.drawLine(64, 20 + (i * 20), 128, 20 + (i * 20))

        p.drawText(150, 25 + (i * 20), str(offset))

    p.end()
    device.save("qpen-dashpattern.png")
    sys.exit()
