author | koda |
Tue, 18 Jan 2011 22:42:06 +0100 | |
changeset 4853 | afe24c4491ef |
parent 4666 | 34551d8639cf |
child 4937 | 55b9145fea94 |
permissions | -rw-r--r-- |
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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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} |