/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, 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 The Qt Company Ltd 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 <cmath>#include <stdlib.h>#include "basictoolsplugin.h"constfloat Pi =3.14159f;
QStringList BasicToolsPlugin::brushes() const
{
returnQStringList() << tr("Pencil") << tr("Air Brush")
<< tr("Random Letters");
}
QRect BasicToolsPlugin::mousePress(constQString&brush,QPainter&painter,constQPoint&pos)
{
return mouseMove(brush, painter, pos, pos);
}
QRect BasicToolsPlugin::mouseMove(constQString&brush,QPainter&painter,constQPoint&oldPos,constQPoint&newPos)
{
painter.save();
int rad = painter.pen().width() /2;
QRect boundingRect =QRect(oldPos, newPos).normalized()
.adjusted(-rad,-rad,+rad,+rad);
QColor color = painter.pen().color();
int thickness = painter.pen().width();
QColor transparentColor(color.red(), color.green(), color.blue(),0);
if (brush == tr("Pencil")) {
painter.drawLine(oldPos, newPos);
} elseif (brush == tr("Air Brush")) {
int numSteps =2+ (newPos - oldPos).manhattanLength() /2;
painter.setBrush(QBrush(color,Qt::Dense6Pattern));
painter.setPen(Qt::NoPen);
for (int i =0; i < numSteps; ++i) {
int x = oldPos.x() + i * (newPos.x() - oldPos.x()) / (numSteps -1);
int y = oldPos.y() + i * (newPos.y() - oldPos.y()) / (numSteps -1);
painter.drawEllipse(x - (thickness /2), y - (thickness /2),
thickness, thickness);
}
} elseif (brush == tr("Random Letters")) {
QChar ch('A'+ (qrand() %26));
QFont biggerFont = painter.font();
biggerFont.setBold(true);
biggerFont.setPointSize(biggerFont.pointSize() + thickness);
painter.setFont(biggerFont);
painter.drawText(newPos,QString(ch));
QFontMetrics metrics(painter.font());
boundingRect = metrics.boundingRect(ch);
boundingRect.translate(newPos);
boundingRect.adjust(-10,-10,+10,+10);
}
painter.restore();
return boundingRect;
}
QRect BasicToolsPlugin::mouseRelease(constQString&/* brush */,QPainter&/* painter */,constQPoint&/* pos */)
{
returnQRect(0,0,0,0);
}
QStringList BasicToolsPlugin::shapes() const
{
returnQStringList() << tr("Circle") << tr("Star") << tr("Text...");
}
QPainterPath BasicToolsPlugin::generateShape(constQString&shape,QWidget*parent)
{
QPainterPath path;
if (shape == tr("Circle")) {
path.addEllipse(0,0,50,50);
} elseif (shape == tr("Star")) {
path.moveTo(90,50);
for (int i =1; i <5; ++i) {
path.lineTo(50+40* std::cos(0.8* i * Pi),50+40* std::sin(0.8* i * Pi));
}
path.closeSubpath();
} elseif (shape == tr("Text...")) {
QString text =QInputDialog::getText(parent, tr("Text Shape"),
tr("Enter text:"),QLineEdit::Normal, tr("Qt"));
if (!text.isEmpty()) {
QFont timesFont("Times",50);
timesFont.setStyleStrategy(QFont::ForceOutline);
path.addText(0,0, timesFont, text);
}
}
return path;
}
QStringList BasicToolsPlugin::filters() const
{
returnQStringList() << tr("Invert Pixels") << tr("Swap RGB")
<< tr("Grayscale");
}
QImage BasicToolsPlugin::filterImage(constQString&filter,constQImage&image,QWidget*/* parent */)
{
QImage result = image.convertToFormat(QImage::Format_RGB32);
if (filter == tr("Invert Pixels")) {
result.invertPixels();
} elseif (filter == tr("Swap RGB")) {
result = result.rgbSwapped();
} elseif (filter == tr("Grayscale")) {
for (int y =0; y < result.height(); ++y) {
for (int x =0; x < result.width(); ++x) {
int pixel = result.pixel(x, y);
int gray =qGray(pixel);
int alpha =qAlpha(pixel);
result.setPixel(x, y,qRgba(gray, gray, gray, alpha));
}
}
}
return result;
}
