renderarea.cpp Example Filepainting/transformations/renderarea.cpp/**************************************************************************** ** ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies). ** Contact: http://www.qt-project.org/ ** ** 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" RenderArea::RenderArea(QWidget *parent) : QWidget(parent) { QFont newFont = font(); newFont.setPixelSize(12); setFont(newFont); QFontMetrics fontMetrics(newFont); xBoundingRect = fontMetrics.boundingRect(tr("x")); yBoundingRect = fontMetrics.boundingRect(tr("y")); } void RenderArea::setOperations(const QList<Operation> &operations) { this->operations = operations; update(); } void RenderArea::setShape(const QPainterPath &shape) { this->shape = shape; update(); } QSize RenderArea::minimumSizeHint() const { return QSize(182, 182); } QSize RenderArea::sizeHint() const { return QSize(232, 232); } void RenderArea::paintEvent(QPaintEvent *event) { QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); painter.fillRect(event->rect(), QBrush(Qt::white)); painter.translate(66, 66); painter.save(); transformPainter(painter); drawShape(painter); painter.restore(); drawOutline(painter); transformPainter(painter); drawCoordinates(painter); } void RenderArea::drawCoordinates(QPainter &painter) { painter.setPen(Qt::red); painter.drawLine(0, 0, 50, 0); painter.drawLine(48, -2, 50, 0); painter.drawLine(48, 2, 50, 0); painter.drawText(60 - xBoundingRect.width() / 2, 0 + xBoundingRect.height() / 2, tr("x")); painter.drawLine(0, 0, 0, 50); painter.drawLine(-2, 48, 0, 50); painter.drawLine(2, 48, 0, 50); painter.drawText(0 - yBoundingRect.width() / 2, 60 + yBoundingRect.height() / 2, tr("y")); } void RenderArea::drawOutline(QPainter &painter) { painter.setPen(Qt::darkGreen); painter.setPen(Qt::DashLine); painter.setBrush(Qt::NoBrush); painter.drawRect(0, 0, 100, 100); } void RenderArea::drawShape(QPainter &painter) { painter.fillPath(shape, Qt::blue); } void RenderArea::transformPainter(QPainter &painter) { for (int i = 0; i < operations.size(); ++i) { switch (operations[i]) { case Translate: painter.translate(50, 50); break; case Scale: painter.scale(0.75, 0.75); break; case Rotate: painter.rotate(60); break; case NoTransformation: default: ; } } } |