kwin/effects/_test/drunken.cpp

/*****************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2007 Lubos Lunak <l.lunak@kde.org>

You can Freely distribute this program under the GNU General Public
License. See the file "COPYING" for the exact licensing terms.
******************************************************************/

#include "drunken.h"

#include <math.h>

namespace KWin
{

KWIN_EFFECT(drunken, DrunkenEffect)

void DrunkenEffect::prePaintScreen(ScreenPrePaintData& data, int time)
{
    if (!windows.isEmpty())
        data.mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
    effects->prePaintScreen(data, time);
}

void DrunkenEffect::prePaintWindow(EffectWindow* w, WindowPrePaintData& data, int time)
{
    if (windows.contains(w)) {
        windows[ w ] += time / 1000.;
        if (windows[ w ] < 1)
            data.setTransformed();
        else
            windows.remove(w);
    }
    effects->prePaintWindow(w, data, time);
}

void DrunkenEffect::paintWindow(EffectWindow* w, int mask, QRegion region, WindowPaintData& data)
{
    if (!windows.contains(w)) {
        effects->paintWindow(w, mask, region, data);
        return;
    }
    WindowPaintData d1 = data;
    // 4 cycles, decreasing amplitude
    int diff = int(sin(windows[ w ] * 8 * M_PI) * (1 - windows[ w ]) * 10);
    d1.xTranslate -= diff;
    d1.opacity *= 0.5;
    effects->paintWindow(w, mask, region, d1);
    WindowPaintData d2 = data;
    d2.xTranslate += diff;
    d2.opacity *= 0.5;
    effects->paintWindow(w, mask, region, d2);
}

void DrunkenEffect::postPaintWindow(EffectWindow* w)
{
    if (windows.contains(w))
        w->addRepaintFull();
    effects->postPaintWindow(w);
}

void DrunkenEffect::windowAdded(EffectWindow* w)
{
    windows[ w ] = 0;
    w->addRepaintFull();
}

void DrunkenEffect::windowClosed(EffectWindow* w)
{
    windows.remove(w);
}

} // namespace