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/****************************************************************************
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of a Qt Solutions component.
**
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Solutions 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.
**
** Please note Third Party Software included with Qt Solutions may impose
** additional restrictions and it is the user's responsibility to ensure
** that they have met the licensing requirements of the GPL, LGPL, or Qt
** Solutions Commercial license and the relevant license of the Third
** Party Software they are using.
**
** If you are unsure which license is appropriate for your use, please
** contact Nokia at qt-info@nokia.com.
**
****************************************************************************/
#include "drawboard.h"
#include "dump.xpm"
#include "draw.h"
#include <QtGui/QPixmap>
#include <QtGui/QPainter>
#include <qtcolorpicker.h>
#include <QtGui/QCursor>
#include <QtGui/QImage>
#include <QtGui/QSizePolicy>
#include <QtGui/QMouseEvent>
#include <QtGui/QResizeEvent>
#include <QtGui/QPaintEvent>
#include <stdlib.h>
/* \class DrawBoard
\brief The DrawBoard class provides a widget that the user can
draw on with the mouse cursor.
*/
/*
Constructs a draw board. Gives it a white background color.
*/
DrawBoard::DrawBoard(QWidget *parent)
: QWidget(parent), f(0.0), pixmapLoaded(false)
{
QPalette p = palette();
p.setColor(backgroundRole(), Qt::white);
setPalette(p);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
setCursor(Qt::CrossCursor);
}
/* \reimp
*/
void DrawBoard::paintEvent(QPaintEvent *)
{
// Lazy load of the initial background pixmap.
if (!pixmapLoaded)
pix = QPixmap((const char **)dump_xpm);
// Only repaint the rects that need repainting.
QPainter p(this);
p.drawPixmap(rect(), pix, pix.rect());
}
/* \reimp
Keeps the original QPixmap contents when enlarging, but clear the
parts that are not drawn when shrinking.
*/
void DrawBoard::resizeEvent(QResizeEvent *e)
{
QWidget::resizeEvent(e);
if (size().isEmpty())
return;
QPixmap copy(pixmapLoaded ? pix : QPixmap((const char **)dump_xpm));
pixmapLoaded = true;
pix = QPixmap(size());
pix.fill(Qt::white);
QPainter p(&pix);
p.drawPixmap(copy.rect(), copy, copy.rect());
update();
}
/*
If the mouse button is held, draws on 30 random points surrounding
the cursor. This gives a chalky look.
*/
void DrawBoard::mouseMoveEvent(QMouseEvent *e)
{
QPainter p(&pix);
p.setPen(QPen(QColor(col)));
for (int i = 0; i < 30; ++i) {
p.drawPoint(e->x() + rand() % 5 - rand() % 5,
e->y() + rand() % 4 - rand() % 4);
}
update();
}
/*
Draws on 30 random points surrounding the cursor. This gives a
chalky look.
*/
void DrawBoard::mousePressEvent(QMouseEvent *e)
{
if (e->button() & Qt::RightButton) {
QColor col = QtColorPicker::getColor(mapToGlobal(e->pos()), true);
if (col.isValid())
setColor(col);
}
if (e->button() & Qt::LeftButton) {
QPainter p(&pix);
p.setPen(QPen(QColor(col)));
for (int i = 0; i < 30; ++i) {
p.drawPoint(e->x() + rand() % 5 - rand() % 5,
e->y() + rand() % 4 - rand() % 4);
}
update();
}
}
/* \fn DrawBoard::colorChanged(const QColor &color)
This signal is emitted when the DrawBoard's color is changed.
\a color is the new color.
*/
/*
Sets the color used for drawing on the draw board.
*/
void DrawBoard::setColor(const QColor &c)
{
if (c == col)
return;
col = c;
emit colorChanged(c);
}
/*
Clears the draw board, giving it a white background.
*/
void DrawBoard::clear()
{
pix.fill(Qt::white);
update();
}
/* \reimp
*/
QSize DrawBoard::sizeHint() const
{
return QSize(200, 220);
}
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