Initial ripple effect implementation
This ripple effect will be used by the WaterAnimation to generate a cool simulation of water flowing inside a plasma widget :) svn path=/trunk/KDE/kdelibs/; revision=1116473
This commit is contained in:
Bruno de Oliveira Abinader
parent
1d8d908d9b
commit
ea49b36874
@ -115,6 +115,7 @@ set(plasma_LIB_SRCS
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private/windowpreview.cpp
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private/kineticscroll.cpp
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private/effects/halopainter.cpp
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private/effects/ripple.cpp
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querymatch.cpp
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remote/accessmanager.cpp
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remote/accessappletjob.cpp
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210
private/effects/ripple.cpp
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210
private/effects/ripple.cpp
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@ -0,0 +1,210 @@
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/*
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* Copyright (C) 2010 Bruno Abinader <bruno.abinader@indt.org.br>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <QtCore/QObject>
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#include <QtGui/QPainter>
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#include <KDebug>
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#include "ripple_p.h"
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/**
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* Allocates an integer matrix with the given size.
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* @param size Matrix size
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* @return integer matrix
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*/
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int **allocateWaveMap(const QSize &size)
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{
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int **waveMap = new int *[size.width()];
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if (!waveMap) {
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kDebug() << "could not allocate wave map";
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return 0;
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}
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for (int x = 0; x < size.width(); ++x) {
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waveMap[x] = new int[size.height()];
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if (!waveMap[x]) {
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kDebug() << "could not allocate wave map";
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return 0;
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}
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}
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return waveMap;
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}
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/**
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* Deallocates an integer matrix
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* @param waveMap integer matrix
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*/
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void deallocateWaveMap(int **waveMap)
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{
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if (waveMap) {
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delete [] *waveMap;
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delete [] waveMap;
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}
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}
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namespace Plasma
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{
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RippleEffect::RippleEffect(QObject *parent)
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: QGraphicsEffect(parent),
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m_offset(1),
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m_damping(16),
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m_heigth(1),
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m_opacity(0.0),
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m_mapSize(boundingRect().size().toSize()),
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m_previousMap(0),
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m_currentMap(0)
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{
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}
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RippleEffect::~RippleEffect()
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{
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deallocateWaveMap(m_previousMap);
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deallocateWaveMap(m_currentMap);
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}
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qint8 RippleEffect::offset() const
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{
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return m_offset;
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}
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qint8 RippleEffect::damping() const
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{
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return m_damping;
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}
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qint8 RippleEffect::heigth() const
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{
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return m_heigth;
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}
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qreal RippleEffect::opacity() const
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{
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return m_opacity;
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}
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void RippleEffect::setOffset(qint8 offset)
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{
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m_offset = offset;
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emit offsetChanged(m_offset);
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}
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void RippleEffect::setDamping(qint8 damping)
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{
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m_damping = damping;
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emit dampingChanged(m_damping);
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}
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void RippleEffect::setHeigth(qint8 heigth)
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{
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m_heigth = heigth;
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emit heigthChanged(m_heigth);
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}
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void RippleEffect::setOpacity(qreal opacity)
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{
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m_opacity = opacity;
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update();
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}
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void RippleEffect::draw(QPainter *painter)
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{
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QPoint offset;
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const QImage currentImage = sourcePixmap(Qt::LogicalCoordinates, &offset).toImage();
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QImage modifiedImage = currentImage;
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if (!m_previousMap && !m_currentMap) {
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m_previousMap = allocateWaveMap(currentImage.size());
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m_currentMap = allocateWaveMap(currentImage.size());
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}
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qint8 x, y;
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if (qFuzzyCompare(m_opacity, 0.0)) {
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for (x = 0; x < currentImage.width(); ++x) {
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memset(m_currentMap[x], 0, sizeof(int) * currentImage.height());
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memset(m_previousMap[x], 0, sizeof(int) * currentImage.height());
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}
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m_mapSize = currentImage.size();
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int waveLength = m_mapSize.width() > m_mapSize.height() ? m_mapSize.width() : m_mapSize.height();
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m_currentMap[m_mapSize.width() >> 1][m_mapSize.height() >> 1] = waveLength << m_heigth;
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} else if (m_mapSize != currentImage.size()) {
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const qreal scaleFactorX = qreal(currentImage.width()) / qreal(m_mapSize.width());
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const qreal scaleFactorY = qreal(currentImage.height()) / qreal(m_mapSize.height());
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int **newPreviousMap = allocateWaveMap(currentImage.size());
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int **newCurrentMap = allocateWaveMap(currentImage.size());
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qint8 i, j;
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for (y = 0; y < currentImage.height(); ++y) {
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for (x = 0; x < currentImage.width(); ++x) {
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i = x / scaleFactorX;
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j = y / scaleFactorY;
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newPreviousMap[x][y] = m_previousMap[i][j];
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newCurrentMap[x][y] = m_currentMap[i][j];
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}
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}
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deallocateWaveMap(m_previousMap);
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deallocateWaveMap(m_currentMap);
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m_mapSize = currentImage.size();
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m_previousMap = newPreviousMap;
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m_currentMap = newCurrentMap;
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}
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const int width = m_mapSize.width();
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const int height = m_mapSize.height();
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int neighbours;
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int wave;
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int xOffset, yOffset;
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for (y = m_offset; y < height - m_offset - 1; ++y) {
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for (x = m_offset; x < width - m_offset - 1; ++x) {
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neighbours = m_previousMap[x+m_offset][y] +
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m_previousMap[x-m_offset][y] +
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m_previousMap[x][y+m_offset] +
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m_previousMap[x][y-m_offset];
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if (!neighbours && !m_currentMap[x][y]) {
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continue;
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}
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wave = (neighbours >> 1) - m_currentMap[x][y];
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wave -= wave >> m_damping;
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m_currentMap[x][y] = wave;
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xOffset = x + m_currentMap[x+m_offset][y] - wave;
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yOffset = y + m_currentMap[x][y+m_offset] - wave;
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modifiedImage.setPixel(x, y, currentImage.pixel(
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qBound(0, xOffset, width - 1),
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qBound(0, yOffset, height - 1)));
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}
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}
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// Swap wave maps
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int **pointer = m_previousMap;
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m_previousMap = m_currentMap;
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m_currentMap = pointer;
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// Restart wave if image center has no wave
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if (m_currentMap[width >> 1][height >> 1] == 0) {
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int waveLength = width > height ? width : height;
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m_currentMap[width >> 1][height >> 1] = waveLength << m_heigth;
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}
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painter->drawImage(offset, currentImage);
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painter->setOpacity(1 - m_opacity);
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painter->drawImage(offset, modifiedImage);
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}
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} // namespace Plasma
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132
private/effects/ripple_p.h
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132
private/effects/ripple_p.h
Normal file
@ -0,0 +1,132 @@
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/*
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* Copyright (C) 2010 Bruno Abinader <bruno.abinader@indt.org.br>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef PLASMA_EFFECTS_RIPPLE_P_H
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#define PLASMA_EFFECTS_RIPPLE_P_H
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#include <QtGui/QGraphicsEffect>
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class QObject;
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class QPainter;
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namespace Plasma
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{
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/**
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* @class RippleEffect plasma/private/effects/ripple_p.h
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* @short Ripple effect.
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*
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* Simulates a ripple effect on the source. This class can be used to simulate a "water" animation.
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*/
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class RippleEffect : public QGraphicsEffect
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{
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Q_OBJECT
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Q_PROPERTY(qint8 offset READ offset WRITE setOffset)
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Q_PROPERTY(qint8 damping READ damping WRITE setDamping)
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Q_PROPERTY(qint8 heigth READ heigth WRITE setHeigth)
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Q_PROPERTY(qreal opacity READ opacity WRITE setOpacity)
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public:
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/**
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* Default constructor
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*
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* @param parent Effect object parent.
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*/
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RippleEffect(QObject *parent = 0);
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/** Destructor */
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~RippleEffect();
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/**
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* Returns the ripple offset. The offset is used to calculate the distande between
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* neighbour pixels.
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* @return ripple offset
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*/
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qint8 offset() const;
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/** Returns the ripple damping factor. The damping factor is used to reduce the wave height
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* through each pass.
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* @return ripple damping factor
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*/
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qint8 damping() const;
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/** Returns the ripple wave heigth factor. The heigth factor is used to enlarge or reduce the
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* initial wave heigth.
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* @return ripple wave heigth factor
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*/
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qint8 heigth() const;
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/** Returns the ripple opacity. The opacity is used to reduce the effect opacity when
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* animating.
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* @return ripple opacity level
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*/
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qreal opacity() const;
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public slots:
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/**
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* Set ripple offset (e.g. 1).
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*/
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void setOffset(qint8 offset);
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/**
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* Set ripple damping factor (e.g. 16).
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*/
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void setDamping(qint8 damping);
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/**
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* Set ripple wave heigth factor (e.g. 1).
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*/
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void setHeigth(qint8 heigth);
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/**
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* Set ripple opacity level (e.g. 1.0).
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*/
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void setOpacity(qreal opacity);
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signals:
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/**
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* Emitted when the ripple offset has changed.
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* @param offset the ripple offset
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*/
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void offsetChanged(qint8 offset);
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/**
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* Emitted when the ripple damping factor has changed.
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* @param damping the ripple damping factor
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*/
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void dampingChanged(qint8 damping);
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/**
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* Emitted when the ripple wave heigth factor has changed.
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* @param heigth the ripple wave heigth factor
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*/
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void heigthChanged(qint8 heigth);
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protected:
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/**
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* Reimplemented from QGraphicsEffect::draw().
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* @param painter source painter
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*/
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void draw(QPainter *painter);
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private:
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Q_DISABLE_COPY(RippleEffect)
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qint8 m_offset; /** Ripple offset (default is 1) */
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qint8 m_damping; /** Ripple damping factor (default is 16) */
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qint8 m_heigth; /** Ripple wave heigth factor (default is 1) */
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qreal m_opacity; /** Ripple opacity level (default is 0.0) */
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QSize m_mapSize; /** Ripple matrix wave size */
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int **m_previousMap; /** Last ripple matrix wave */
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int **m_currentMap; /** Current ripple matrix wave */
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};
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} // namespace Plasma
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#endif // PLASMA_EFFECTS_RIPPLE_P_H
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