QTfrontend/drawmapscene.cpp
author Xeli
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/*
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 * Hedgewars, a free turn based strategy game
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 * Copyright (c) 2012 Andrey Korotaev <unC0Rr@gmail.com>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; version 2 of the License
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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 */
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#include <QGraphicsSceneMouseEvent>
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#include <QGraphicsPathItem>
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#include <QtEndian>
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#include <QDebug>
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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(76);
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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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        if(mouseEvent->modifiers() & Qt::ControlModifier)
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        {
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            int c = path.elementCount();
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            QPointF pos = mouseEvent->scenePos();
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            path.setElementPositionAt(c - 1, pos.x(), pos.y());
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        }
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        else
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        {
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            path.lineTo(mouseEvent->scenePos());
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            paths.first().second.append(mouseEvent->scenePos().toPoint());
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        }
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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(qMakePair(serializePenWidth(m_pen.width()), 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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    if (m_currPath)
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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().second.append(mouseEvent->scenePos().toPoint());
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        m_currPath->setPath(path);
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        simplifyLast();
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        m_currPath = 0;
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    }
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}
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void DrawMapScene::wheelEvent(QGraphicsSceneWheelEvent * wheelEvent)
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{
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    if(wheelEvent->delta() > 0 && m_pen.width() < 516)
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        m_pen.setWidth(m_pen.width() + 10);
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    else if(wheelEvent->delta() < 0 && m_pen.width() >= 16)
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        m_pen.setWidth(m_pen.width() - 10);
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    if(m_currPath)
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    {
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        m_currPath->setPen(m_pen);
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        paths.first().first = serializePenWidth(m_pen.width());
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    }
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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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    else if(oldItems.size())
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    {
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        while(oldItems.size())
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            addItem(oldItems.takeFirst());
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        paths = oldPaths;
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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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    // don't clear if already cleared
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    if(!items().size())
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        return;
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    oldItems.clear();
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    // do this since clear() would _destroy_ all items
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    while(items().size())
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    {
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        oldItems.push_front(items().first());
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        removeItem(items().first());
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    }
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    oldPaths = paths;
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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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        QPair<quint8, QList<QPoint> > points = paths.at(i);
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        foreach(QPoint point, points.second)
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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 = 0;
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            if(!cnt) flags = 0x80 + points.first;
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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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    oldItems.clear();
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    oldPaths.clear();
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    clear();
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    paths.clear();
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    QPair<quint8, 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)
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        {
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            if(points.second.size())
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            {
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                addPath(pointsToPath(points.second), m_pen);
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                paths.prepend(points);
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                points.second.clear();
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            }
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            quint8 penWidth = flags & 0x7f;
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            m_pen.setWidth(deserializePenWidth(penWidth));
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            points.first = penWidth;
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        }
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        points.second.append(QPoint(px, py));
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    }
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    if(points.second.size())
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    {
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        addPath(pointsToPath(points.second), 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).second;
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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].second = 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].second));
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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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}
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quint8 DrawMapScene::serializePenWidth(int width)
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{
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    return (width - 6) / 10;
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}
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int DrawMapScene::deserializePenWidth(quint8 width)
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{
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    return width * 10 + 6;
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}