diff options
Diffstat (limited to 'examples/statemachine/tankgame/gameitem.cpp')
| -rw-r--r-- | examples/statemachine/tankgame/gameitem.cpp | 129 |
1 files changed, 129 insertions, 0 deletions
diff --git a/examples/statemachine/tankgame/gameitem.cpp b/examples/statemachine/tankgame/gameitem.cpp new file mode 100644 index 0000000..ad8b37c --- /dev/null +++ b/examples/statemachine/tankgame/gameitem.cpp @@ -0,0 +1,129 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "gameitem.h" + +#include <QGraphicsScene> +#include <QDebug> + +GameItem::GameItem(QObject *parent) : QObject(parent) +{ +} + +QPointF GameItem::tryMove(const QPointF &requestedPosition, QLineF *collidedLine, + QGraphicsItem **collidedItem) const +{ + QLineF movementPath(pos(), requestedPosition); + + qreal cannonLength = 0.0; + { + QPointF p1 = boundingRect().center(); + QPointF p2 = QPointF(boundingRect().right() + 10.0, p1.y()); + + cannonLength = QLineF(mapToScene(p1), mapToScene(p2)).length(); + } + + movementPath.setLength(movementPath.length() + cannonLength); + + QRectF boundingRectPath(QPointF(qMin(movementPath.x1(), movementPath.x2()), qMin(movementPath.y1(), movementPath.y2())), + QPointF(qMax(movementPath.x1(), movementPath.x2()), qMax(movementPath.y1(), movementPath.y2()))); + + QList<QGraphicsItem *> itemsInRect = scene()->items(boundingRectPath, Qt::IntersectsItemBoundingRect); + + QPointF nextPoint = requestedPosition; + QRectF sceneRect = scene()->sceneRect(); + + foreach (QGraphicsItem *item, itemsInRect) { + if (item == static_cast<const QGraphicsItem *>(this)) + continue; + + QPolygonF mappedBoundingRect = item->mapToScene(item->boundingRect()); + for (int i=0; i<mappedBoundingRect.size(); ++i) { + QPointF p1 = mappedBoundingRect.at(i == 0 ? mappedBoundingRect.size()-1 : i-1); + QPointF p2 = mappedBoundingRect.at(i); + + QLineF rectLine(p1, p2); + QPointF intersectionPoint; + QLineF::IntersectType intersectType = movementPath.intersect(rectLine, &intersectionPoint); + + if (intersectType == QLineF::BoundedIntersection) { + movementPath.setP2(intersectionPoint); + movementPath.setLength(movementPath.length() - cannonLength); + nextPoint = movementPath.p2(); + + if (collidedLine != 0) + *collidedLine = rectLine; + + if (collidedItem != 0) + *collidedItem = item; + } + } + } + + + // Don't go outside of map + if (nextPoint.x() < sceneRect.left()) { + nextPoint.rx() = sceneRect.left(); + if (collidedLine != 0) + *collidedLine = QLineF(scene()->sceneRect().topLeft(), scene()->sceneRect().bottomLeft()); + } + + if (nextPoint.x() > sceneRect.right()) { + nextPoint.rx() = sceneRect.right(); + if (collidedLine != 0) + *collidedLine = QLineF(scene()->sceneRect().topRight(), scene()->sceneRect().bottomRight()); + } + + if (nextPoint.y() < sceneRect.top()) { + nextPoint.ry() = sceneRect.top(); + if (collidedLine != 0) + *collidedLine = QLineF(scene()->sceneRect().topLeft(), scene()->sceneRect().topRight()); + } + + if (nextPoint.y() > sceneRect.bottom()) { + nextPoint.ry() = sceneRect.bottom(); + if (collidedLine != 0) + *collidedLine = QLineF(scene()->sceneRect().bottomLeft(), scene()->sceneRect().bottomRight()); + } + + return nextPoint; +} + |