tools/drawMapTest/drawmapscene.cpp
author nemo
Sun, 25 Jan 2015 14:48:02 -0500 (2015-01-25)
changeset 10808 1e39630d7c2e
parent 4471 220d44cb8659
permissions -rw-r--r--
Add a couple of more variable bindings, make all the set visual gear values optional, to allow skipping trailing params or specifying ones in the middle as nil to not set. Should make using it more convenient in simple cases.
#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;
}