touchpoints.h

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/*
    KWin - the KDE window manager
    This file is part of the KDE project.
 
    SPDX-FileCopyrightText: 2012 Filip Wieladek <wattos@gmail.com>
    SPDX-FileCopyrightText: 2016 Martin Gräßlin <mgraesslin@kde.org>
 
    SPDX-License-Identifier: GPL-2.0-or-later
*/
 
#pragma once
 
#include "effect/effect.h"
 
namespace KWin
{
 
class TouchPointsEffect
    : public Effect
{
    Q_OBJECT
    Q_PROPERTY(qreal lineWidth READ lineWidth)
    Q_PROPERTY(int ringLife READ ringLife)
    Q_PROPERTY(int ringSize READ ringSize)
    Q_PROPERTY(int ringCount READ ringCount)
public:
    TouchPointsEffect();
    ~TouchPointsEffect() override;
    void prePaintScreen(ScreenPrePaintData &data, std::chrono::milliseconds presentTime) override;
    void paintScreen(const RenderTarget &renderTarget, const RenderViewport &viewport, int mask, const QRegion &region, Output *screen) override;
    void postPaintScreen() override;
    bool isActive() const override;
    bool touchDown(qint32 id, const QPointF &pos, std::chrono::microseconds time) override;
    bool touchMotion(qint32 id, const QPointF &pos, std::chrono::microseconds time) override;
    bool touchUp(qint32 id, std::chrono::microseconds time) override;
 
    // for properties
    qreal lineWidth() const
    {
        return m_lineWidth;
    }
    int ringLife() const
    {
        return m_ringLife;
    }
    int ringSize() const
    {
        return m_ringMaxSize;
    }
    int ringCount() const
    {
        return m_ringCount;
    }
 
private:
    inline void drawCircle(const RenderViewport &viewport, const QColor &color, float cx, float cy, float r);
 
    void repaint();
 
    float computeAlpha(int time, int ring);
    float computeRadius(int time, bool press, int ring);
    void drawCircleGl(const RenderViewport &viewport, const QColor &color, float cx, float cy, float r);
    void drawCircleQPainter(const QColor &color, float cx, float cy, float r);
    void paintScreenSetupGl(const RenderTarget &renderTarget, const QMatrix4x4 &projectionMatrix);
    void paintScreenFinishGl();
 
    Qt::GlobalColor colorForId(quint32 id);
 
    int m_ringCount = 2;
    float m_lineWidth = 1.0;
    int m_ringLife = 300;
    float m_ringMaxSize = 20.0;
 
    struct TouchPoint
    {
        QPointF pos;
        int time = 0;
        bool press;
        QColor color;
    };
    QList<TouchPoint> m_points;
    QHash<quint32, QPointF> m_latestPositions;
    QHash<quint32, Qt::GlobalColor> m_colors;
    std::chrono::milliseconds m_lastPresentTime = std::chrono::milliseconds::zero();
};
 
} // namespace