+
−#include <QDebug>
+
−#include <QGraphicsSceneMouseEvent>
+
−#include <QGraphicsPathItem>
+
−#include <QtEndian>
+
−
+
−#include "drawmapscene.h"
+
−
+
−template <class T> T sqr(const T & x)
+
−{
+
−    return x*x;
+
−}
+
−
+
−DrawMapScene::DrawMapScene(QObject *parent) :
+
−    QGraphicsScene(parent),
+
−    m_pen(Qt::yellow),
+
−    m_brush(Qt::yellow)
+
−{
+
−    setSceneRect(0, 0, 4096, 2048);
+
−
+
−    QLinearGradient gradient(0, 0, 0, 2048);
+
−    gradient.setColorAt(0, QColor(60, 60, 155));
+
−    gradient.setColorAt(1, QColor(155, 155, 60));
+
−    setBackgroundBrush(QBrush(gradient));
+
−
+
−    m_pen.setWidth(67);
+
−    m_pen.setJoinStyle(Qt::RoundJoin);
+
−    m_pen.setCapStyle(Qt::RoundCap);
+
−    m_currPath = 0;
+
−}
+
−
+
−void DrawMapScene::mouseMoveEvent(QGraphicsSceneMouseEvent * mouseEvent)
+
−{
+
−
+
−    qDebug() << "move" << mouseEvent->scenePos();
+
−
+
−    if(m_currPath && (mouseEvent->buttons() & Qt::LeftButton))
+
−    {
+
−        QPainterPath path = m_currPath->path();
+
−        path.lineTo(mouseEvent->scenePos());
+
−        paths.first().append(mouseEvent->scenePos().toPoint());
+
−        m_currPath->setPath(path);
+
−
+
−        emit pathChanged();
+
−    }
+
−}
+
−
+
−void DrawMapScene::mousePressEvent(QGraphicsSceneMouseEvent * mouseEvent)
+
−{
+
−    qDebug() << "press" << mouseEvent->scenePos();
+
−
+
−    m_currPath = addPath(QPainterPath(), m_pen);
+
−
+
−    QPainterPath path = m_currPath->path();
+
−    QPointF p = mouseEvent->scenePos();
+
−    p += QPointF(0.01, 0.01);
+
−    path.moveTo(p);
+
−    path.lineTo(mouseEvent->scenePos());
+
−    paths.prepend(QList<QPoint>() << mouseEvent->scenePos().toPoint());
+
−    m_currPath->setPath(path);
+
−
+
−    emit pathChanged();
+
−}
+
−
+
−void DrawMapScene::mouseReleaseEvent(QGraphicsSceneMouseEvent * mouseEvent)
+
−{
+
−    qDebug() << "release" << mouseEvent->scenePos();
+
−
+
−    simplifyLast();
+
−
+
−    m_currPath = 0;
+
−}
+
−
+
−void DrawMapScene::undo()
+
−{
+
−    if(items().size())
+
−    {
+
−        removeItem(items().first());
+
−        paths.removeFirst();
+
−
+
−        emit pathChanged();
+
−    }
+
−}
+
−
+
−QByteArray DrawMapScene::encode()
+
−{
+
−    QByteArray b;
+
−
+
−    foreach(QList<QPoint> points, paths)
+
−    {
+
−        int cnt = 0;
+
−        foreach(QPoint point, points)
+
−        {
+
−            qint16 px = qToBigEndian((qint16)point.x());
+
−            qint16 py = qToBigEndian((qint16)point.y());
+
−            quint8 flags = 2;
+
−            if(!cnt) flags |= 0x80;
+
−            b.append((const char *)&px, 2);
+
−            b.append((const char *)&py, 2);
+
−            b.append((const char *)&flags, 1);
+
−
+
−            ++cnt;
+
−        }
+
−
+
−    }
+
−
+
−    return b;
+
−}
+
−
+
−void DrawMapScene::decode(QByteArray data)
+
−{
+
−    clear();
+
−    paths.clear();
+
−
+
−    QList<QPoint> points;
+
−
+
−    while(data.size() >= 5)
+
−    {
+
−        qint16 px = qFromBigEndian(*(qint16 *)data.data());
+
−        data.remove(0, 2);
+
−        qint16 py = qFromBigEndian(*(qint16 *)data.data());
+
−        data.remove(0, 2);
+
−        quint8 flags = *(quint8 *)data.data();
+
−        data.remove(0, 1);
+
−
+
−        //last chunk or first point
+
−        if((data.size() < 5) || (flags & 0x80))
+
−        {
+
−            if(points.size())
+
−            {
+
−                qDebug() << points;
+
−                addPath(pointsToPath(points), m_pen);
+
−                paths.prepend(points);
+
−
+
−                points.clear();
+
−            }
+
−        }
+
−
+
−        points.append(QPoint(px, py));
+
−    }
+
−}
+
−
+
−void DrawMapScene::simplifyLast()
+
−{
+
−    QList<QPoint> points = paths[0];
+
−
+
−    QPoint prevPoint = points.first();
+
−    int i = 1;
+
−    while(i < points.size())
+
−    {
+
−        if( (i != points.size() - 1)
+
−            && (sqr(prevPoint.x() - points[i].x()) + sqr(prevPoint.y() - points[i].y()) < 1000)
+
−          )
+
−            points.removeAt(i);
+
−        else
+
−        {
+
−            prevPoint = points[i];
+
−            ++i;
+
−        }
+
−    }
+
−
+
−    paths[0] = points;
+
−
+
−
+
−    // redraw path
+
−    {
+
−        QGraphicsPathItem * pathItem = static_cast<QGraphicsPathItem *>(items()[0]);
+
−        pathItem->setPath(pointsToPath(paths[0]));
+
−    }
+
−
+
−    emit pathChanged();
+
−}
+
−
+
−QPainterPath DrawMapScene::pointsToPath(const QList<QPoint> points)
+
−{
+
−    QPainterPath path;
+
−
+
−    if(points.size())
+
−    {
+
−        QPointF p = points[0] + QPointF(0.01, 0.01);
+
−        path.moveTo(p);
+
−
+
−        foreach(QPoint p, points)
+
−            path.lineTo(p);
+
−    }
+
−
+
−    return path;
+
−}