Warning, file /plasma/khotkeys/kcm_hotkeys/helper_widgets/gesture_drawer.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
     SPDX-License-Identifier: GPL-2.0-only
     SPDX-FileCopyrightText: 2003 Mike Pilone <mpilone@slac.com>
     SPDX-FileCopyrightText: 2003 Lubos Lunak <l.lunak@kde.org>
     SPDX-FileCopyrightText: 2009 Michael Jansen <kde@michael-jansen.biz>
  */
 
 #include <QColor>
 #include <QGradient>
 #include <QPaintEvent>
 #include <QPainter>
 
 #include "gesture_drawer.h"
 
 GestureDrawer::GestureDrawer(QWidget *parent, const char *name)
     : QFrame(parent)
     , _data(KHotKeys::StrokePoints())
 {
     setObjectName(name);
     QPalette p;
     p.setColor(backgroundRole(), palette().color(QPalette::Base));
     setPalette(p);
     setFrameStyle(QFrame::Panel | QFrame::Sunken);
     setMinimumSize(30, 30);
 }
 
 GestureDrawer::~GestureDrawer()
 {
 }
 
 KHotKeys::StrokePoints GestureDrawer::pointData() const
 {
     return _data;
 }
 
 void GestureDrawer::setPointData(const KHotKeys::StrokePoints &data)
 {
     _data = data;
 
     repaint();
 }
 
 void GestureDrawer::paintEvent(QPaintEvent *ev)
 {
     const int n = _data.size();
 
     if (n < 2) {
         QFrame::paintEvent(ev);
         return;
     }
 
     const int border = 6;
 
     const int l = width() < height() ? width() : height();
     const int x_offset = border + (width() - l) / 2;
     const int y_offset = border + (height() - l) / 2;
 
     QPainter p(this);
     p.setRenderHint(QPainter::Antialiasing);
     QPen pen;
     pen.setWidth(4);
     pen.setCapStyle(Qt::RoundCap);
 
     // starting point
     double x = x_offset + _data[0].x * (l - 2 * border);
     double y = y_offset + _data[0].y * (l - 2 * border);
 
     for (int i = 0; i < n - 1; i++) {
         double nextx = x_offset + _data[i + 1].x * (l - 2 * border);
         double nexty = y_offset + _data[i + 1].y * (l - 2 * border);
 
         QLinearGradient grad(x, y, nextx, nexty);
         const int startRed = 0;
         const int startGreen = (1 - _data[i].s) * 255;
         const int startBlue = _data[i].s * 255;
         const int endRed = 0;
         const int endGreen = (1 - _data[i + 1].s) * 255;
         const int endBlue = _data[i + 1].s * 255;
         QColor startColor(startRed, startGreen, startBlue);
         QColor endColor(endRed, endGreen, endBlue);
         grad.setColorAt(0, startColor);
         grad.setColorAt(1, endColor);
 
         pen.setBrush(grad);
         p.setPen(pen);
         p.drawLine(x, y, nextx, nexty);
 
         x = nextx;
         y = nexty;
     }
 
     QFrame::paintEvent(ev);
 }
 
 #include "moc_gesture_drawer.cpp"