qt5base-lts/examples/painting/basicdrawing/renderarea.cpp

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtWidgets>
#include "renderarea.h"
//! [0]
RenderArea::RenderArea(QWidget *parent)
: QWidget(parent)
{
shape = Polygon;
antialiased = false;
transformed = false;
pixmap.load(":/images/qt-logo.png");
setBackgroundRole(QPalette::Base);
setAutoFillBackground(true);
}
//! [0]
//! [1]
QSize RenderArea::minimumSizeHint() const
{
return QSize(100, 100);
}
//! [1]
//! [2]
QSize RenderArea::sizeHint() const
{
return QSize(400, 200);
}
//! [2]
//! [3]
void RenderArea::setShape(Shape shape)
{
this->shape = shape;
update();
}
//! [3]
//! [4]
void RenderArea::setPen(const QPen &pen)
{
this->pen = pen;
update();
}
//! [4]
//! [5]
void RenderArea::setBrush(const QBrush &brush)
{
this->brush = brush;
update();
}
//! [5]
//! [6]
void RenderArea::setAntialiased(bool antialiased)
{
this->antialiased = antialiased;
update();
}
//! [6]
//! [7]
void RenderArea::setTransformed(bool transformed)
{
this->transformed = transformed;
update();
}
//! [7]
//! [8]
void RenderArea::paintEvent(QPaintEvent * /* event */)
{
static const QPoint points[4] = {
QPoint(10, 80),
QPoint(20, 10),
QPoint(80, 30),
QPoint(90, 70)
};
QRect rect(10, 20, 80, 60);
QPainterPath path;
path.moveTo(20, 80);
path.lineTo(20, 30);
path.cubicTo(80, 0, 50, 50, 80, 80);
int startAngle = 20 * 16;
int arcLength = 120 * 16;
//! [8]
//! [9]
QPainter painter(this);
painter.setPen(pen);
painter.setBrush(brush);
if (antialiased)
painter.setRenderHint(QPainter::Antialiasing, true);
//! [9]
//! [10]
for (int x = 0; x < width(); x += 100) {
for (int y = 0; y < height(); y += 100) {
painter.save();
painter.translate(x, y);
//! [10] //! [11]
if (transformed) {
painter.translate(50, 50);
painter.rotate(60.0);
painter.scale(0.6, 0.9);
painter.translate(-50, -50);
}
//! [11]
//! [12]
switch (shape) {
case Line:
painter.drawLine(rect.bottomLeft(), rect.topRight());
break;
case Points:
painter.drawPoints(points, 4);
break;
case Polyline:
painter.drawPolyline(points, 4);
break;
case Polygon:
painter.drawPolygon(points, 4);
break;
case Rect:
painter.drawRect(rect);
break;
case RoundedRect:
painter.drawRoundedRect(rect, 25, 25, Qt::RelativeSize);
break;
case Ellipse:
painter.drawEllipse(rect);
break;
case Arc:
painter.drawArc(rect, startAngle, arcLength);
break;
case Chord:
painter.drawChord(rect, startAngle, arcLength);
break;
case Pie:
painter.drawPie(rect, startAngle, arcLength);
break;
case Path:
painter.drawPath(path);
break;
case Text:
painter.drawText(rect, Qt::AlignCenter, tr("Qt by\nNokia"));
break;
case Pixmap:
painter.drawPixmap(10, 10, pixmap);
}
//! [12] //! [13]
painter.restore();
}
}
painter.setRenderHint(QPainter::Antialiasing, false);
painter.setPen(palette().dark().color());
painter.setBrush(Qt::NoBrush);
painter.drawRect(QRect(0, 0, width() - 1, height() - 1));
}
//! [13]