File indexing completed on 2024-04-21 15:24:03

 // This file is part of Washi Pad
 // SPDX-FileCopyrightText: 2018 Kevin Ottens <ervin@kde.org>
 // SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
 
 #include "strokepainter.h"
 
 #include <QPainter>
 #include <QPainterPath>
 #include <QVector2D>
 
 #include "stroke.h"
 
 void StrokePainter::render(const Stroke &stroke, QPainter *painter)
 {
     const auto samples = stroke.samples();
     if (samples.size() < 2)
         return;
 
     auto it = std::cbegin(samples);
     auto lastSample = *it;
     ++it;
 
     auto forwardPoints = QVector<QVector2D>{};
     auto backwardPoints = QVector<QVector2D>{};
 
     while (it != std::cend(samples)) {
         const auto currentSample = *it;
 
         const auto penWidth = currentSample.width;
 
         const auto currentPos = currentSample.position;
         const auto lastPos = lastSample.position;
 
         const auto direction = currentPos - lastPos;
         const auto ortho = QVector2D(direction.y(), -direction.x()).normalized();
 
         const auto p1 = (lastPos - penWidth * ortho / 2.0f);
         const auto p2 = (lastPos + penWidth * ortho / 2.0f);
         const auto p3 = (currentPos - penWidth * ortho / 2.0f);
         const auto p4 = (currentPos + penWidth * ortho / 2.0f);
 
         forwardPoints << p1 << p3;
         backwardPoints << p2 << p4;
 
         lastSample = currentSample;
         ++it;
     }
 
     auto path = QPainterPath();
     path.moveTo(static_cast<qreal>(forwardPoints[0].x()),
                 static_cast<qreal>(forwardPoints[0].y()));
     for (auto it = forwardPoints.cbegin() + 1; it != forwardPoints.cend(); ++it) {
         path.lineTo(static_cast<qreal>(it->x()),
                     static_cast<qreal>(it->y()));
     }
     for (auto it = backwardPoints.crbegin(); it != backwardPoints.crend(); ++it) {
         path.lineTo(static_cast<qreal>(it->x()),
                     static_cast<qreal>(it->y()));
     }
     path.closeSubpath();
     path.setFillRule(Qt::WindingFill);
 
     painter->setPen(Qt::NoPen);
     painter->setBrush(stroke.color());
     painter->drawPath(path);
 }