QTfrontend/drawmapscene.cpp
author koda
Mon, 17 Jan 2011 23:22:52 +0100
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permissions -rw-r--r--
merge latest 0.9.15 changes into head
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#include <QGraphicsSceneMouseEvent>
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#include <QGraphicsPathItem>
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#include <QtEndian>
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#include "drawmapscene.h"
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template <class T> T sqr(const T & x)
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{
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    return x*x;
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}
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DrawMapScene::DrawMapScene(QObject *parent) :
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    QGraphicsScene(parent),
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    m_pen(Qt::yellow),
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    m_brush(Qt::yellow)
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{
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    setSceneRect(0, 0, 4096, 2048);
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    QLinearGradient gradient(0, 0, 0, 2048);
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    gradient.setColorAt(0, QColor(60, 60, 155));
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    gradient.setColorAt(1, QColor(155, 155, 60));
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    setBackgroundBrush(QBrush(gradient));
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    m_pen.setWidth(67);
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    m_pen.setJoinStyle(Qt::RoundJoin);
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    m_pen.setCapStyle(Qt::RoundCap);
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    m_currPath = 0;
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}
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void DrawMapScene::mouseMoveEvent(QGraphicsSceneMouseEvent * mouseEvent)
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{
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    if(m_currPath && (mouseEvent->buttons() & Qt::LeftButton))
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    {
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        QPainterPath path = m_currPath->path();
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        path.lineTo(mouseEvent->scenePos());
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        paths.first().append(mouseEvent->scenePos().toPoint());
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        m_currPath->setPath(path);
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        emit pathChanged();
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    }
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}
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void DrawMapScene::mousePressEvent(QGraphicsSceneMouseEvent * mouseEvent)
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{
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    m_currPath = addPath(QPainterPath(), m_pen);
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    QPainterPath path = m_currPath->path();
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    QPointF p = mouseEvent->scenePos();
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    p += QPointF(0.01, 0.01);
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    path.moveTo(p);
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    path.lineTo(mouseEvent->scenePos());
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    paths.prepend(QList<QPoint>() << mouseEvent->scenePos().toPoint());
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    m_currPath->setPath(path);
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    emit pathChanged();
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}
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void DrawMapScene::mouseReleaseEvent(QGraphicsSceneMouseEvent * mouseEvent)
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{
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    Q_UNUSED(mouseEvent);
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    simplifyLast();
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    m_currPath = 0;
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}
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void DrawMapScene::undo()
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{
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    if(items().size())
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    {
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        removeItem(items().first());
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        paths.removeFirst();
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        emit pathChanged();
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    }
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}
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void DrawMapScene::clearMap()
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{
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    clear();
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    paths.clear();
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    emit pathChanged();
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}
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QByteArray DrawMapScene::encode()
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{
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    QByteArray b;
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    for(int i = paths.size() - 1; i >= 0; --i)
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    {
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        int cnt = 0;
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        QList<QPoint> points = paths.at(i);
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        foreach(QPoint point, points)
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        {
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            qint16 px = qToBigEndian((qint16)point.x());
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            qint16 py = qToBigEndian((qint16)point.y());
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            quint8 flags = 2;
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            if(!cnt) flags |= 0x80;
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            b.append((const char *)&px, 2);
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            b.append((const char *)&py, 2);
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            b.append((const char *)&flags, 1);
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            ++cnt;
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        }
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    }
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    return b;
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}
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void DrawMapScene::decode(QByteArray data)
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{
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    clear();
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    paths.clear();
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    QList<QPoint> points;
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    while(data.size() >= 5)
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    {
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        qint16 px = qFromBigEndian(*(qint16 *)data.data());
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        data.remove(0, 2);
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        qint16 py = qFromBigEndian(*(qint16 *)data.data());
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        data.remove(0, 2);
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        quint8 flags = *(quint8 *)data.data();
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        data.remove(0, 1);
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        if((flags & 0x80) && points.size())
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        {
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            addPath(pointsToPath(points), m_pen);
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            paths.prepend(points);
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            points.clear();
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        }
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        points.append(QPoint(px, py));
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    }
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    if(points.size())
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    {
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        addPath(pointsToPath(points), m_pen);
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        paths.prepend(points);
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    }
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    emit pathChanged();
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}
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void DrawMapScene::simplifyLast()
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{
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    if(!paths.size()) return;
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    QList<QPoint> points = paths.at(0);
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    QPoint prevPoint = points.first();
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    int i = 1;
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    while(i < points.size())
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    {
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        if( (i != points.size() - 1)
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            && (sqr(prevPoint.x() - points[i].x()) + sqr(prevPoint.y() - points[i].y()) < 1000)
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          )
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            points.removeAt(i);
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        else
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        {
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            prevPoint = points[i];
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            ++i;
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        }
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    }
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    paths[0] = points;
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    // redraw path
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    {
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        QGraphicsPathItem * pathItem = static_cast<QGraphicsPathItem *>(items()[0]);
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        pathItem->setPath(pointsToPath(paths[0]));
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    }
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    emit pathChanged();
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}
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QPainterPath DrawMapScene::pointsToPath(const QList<QPoint> points)
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{
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    QPainterPath path;
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    if(points.size())
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    {
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        QPointF p = points[0] + QPointF(0.01, 0.01);
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        path.moveTo(p);
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        foreach(QPoint p, points)
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            path.lineTo(p);
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    }
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    return path;
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}