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Diffstat (limited to 'examples/statemachine/tankgame/tankitem.cpp')
| -rw-r--r-- | examples/statemachine/tankgame/tankitem.cpp | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/examples/statemachine/tankgame/tankitem.cpp b/examples/statemachine/tankgame/tankitem.cpp new file mode 100644 index 0000000..393d65f --- /dev/null +++ b/examples/statemachine/tankgame/tankitem.cpp @@ -0,0 +1,302 @@ +/**************************************************************************** +** +** 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 "tankitem.h" + +#include <QPainter> +#include <QGraphicsScene> +#include <QDebug> + +#include <math.h> + +#ifndef M_PI +#define M_PI 3.14159265358979323846 +#endif + +class Action +{ +public: + Action(TankItem *item) : m_item(item) + { + } + + TankItem *item() const { return m_item; } + void setItem(TankItem *item) { m_item = item; } + + virtual bool apply(qreal timeDelta) = 0; + +private: + TankItem *m_item; +}; + +class MoveAction: public Action +{ +public: + MoveAction(TankItem *item, qreal distance) + : Action(item), m_distance(distance) + { + m_reverse = m_distance < 0.0; + } + + bool apply(qreal timeDelta) + { + qreal dist = timeDelta * item()->speed() * (m_reverse ? -1.0 : 1.0); + + bool done = false; + if (qAbs(m_distance) < qAbs(dist)) { + done = true; + dist = m_distance; + } + m_distance -= dist; + + qreal a = item()->direction() * M_PI / 180.0; + + qreal yd = dist * sin(a); + qreal xd = dist * sin(M_PI / 2.0 - a); + + item()->setPos(item()->pos() + QPointF(xd, yd)); + return !done; + } + +private: + qreal m_distance; + bool m_reverse; +}; + +class TurnAction: public Action +{ +public: + TurnAction(TankItem *item, qreal distance) + : Action(item), m_distance(distance) + { + m_reverse = m_distance < 0.0; + } + + bool apply(qreal timeDelta) + { + qreal dist = timeDelta * item()->angularSpeed() * (m_reverse ? -1.0 : 1.0); + bool done = false; + if (qAbs(m_distance) < qAbs(dist)) { + done = true; + dist = m_distance; + } + m_distance -= dist; + + item()->setDirection(item()->direction() + dist); + return !done; + } + +private: + qreal m_distance; + bool m_reverse; +}; + +TankItem::TankItem(QObject *parent) + : GameItem(parent), m_currentAction(0), m_currentDirection(0.0), m_enabled(true) +{ + connect(this, SIGNAL(cannonFired()), this, SIGNAL(actionCompleted())); +} + +void TankItem::idle(qreal elapsed) +{ + if (m_enabled) { + if (m_currentAction != 0) { + if (!m_currentAction->apply(elapsed)) { + setAction(0); + emit actionCompleted(); + } + + QGraphicsItem *item = 0; + qreal distance = distanceToObstacle(&item); + if (TankItem *tankItem = qgraphicsitem_cast<TankItem *>(item)) + emit tankSpotted(tankItem->direction(), distance); + } + } +} + +void TankItem::hitByRocket() +{ + emit aboutToBeDestroyed(); + deleteLater(); +} + +void TankItem::setAction(Action *newAction) +{ + if (m_currentAction != 0) + delete m_currentAction; + + m_currentAction = newAction; +} + +void TankItem::fireCannon() +{ + emit cannonFired(); +} + +void TankItem::moveForwards(qreal length) +{ + setAction(new MoveAction(this, length)); +} + +void TankItem::moveBackwards(qreal length) +{ + setAction(new MoveAction(this, -length)); +} + +void TankItem::turn(qreal degrees) +{ + setAction(new TurnAction(this, degrees)); +} + +void TankItem::turnTo(qreal degrees) +{ + setAction(new TurnAction(this, degrees - direction())); +} + +void TankItem::stop() +{ + setAction(0); +} + +QVariant TankItem::itemChange(QGraphicsItem::GraphicsItemChange change, const QVariant &value) +{ + if (change == ItemPositionChange && scene()) { + QPointF requestedPosition = value.toPointF(); + QLineF collidedLine; + QPointF nextPoint = tryMove(requestedPosition, &collidedLine); + if (nextPoint != requestedPosition) + emit collision(collidedLine); + return nextPoint; + } else { + return QGraphicsItem::itemChange(change, value); + } +} + + +void TankItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *) +{ + QRectF brect = boundingRect(); + + painter->setBrush(m_color); + painter->setPen(Qt::black); + + // body + painter->drawRect(brect.adjusted(0.0, 4.0, -2.0, -4.0)); + + // cannon + QRectF cannonBase = brect.adjusted(10.0, 6.0, -12.0, -6.0); + painter->drawEllipse(cannonBase); + + painter->drawRect(QRectF(QPointF(cannonBase.center().x(), cannonBase.center().y() - 2.0), + QPointF(brect.right(), cannonBase.center().y() + 2.0))); + + // left track + painter->setBrush(QBrush(Qt::black, Qt::VerPattern)); + QRectF leftTrackRect = QRectF(brect.topLeft(), QPointF(brect.right() - 2.0, brect.top() + 4.0)); + painter->fillRect(leftTrackRect, Qt::darkYellow); + painter->drawRect(leftTrackRect); + + // right track + QRectF rightTrackRect = QRectF(QPointF(brect.left(), brect.bottom() - 4.0), + QPointF(brect.right() - 2.0, brect.bottom())); + painter->fillRect(rightTrackRect, Qt::darkYellow); + painter->drawRect(rightTrackRect); + + if (!m_enabled) { + painter->setPen(QPen(Qt::red, 5)); + + painter->drawEllipse(brect); + + QPainterPath path; + path.addEllipse(brect); + painter->setClipPath(path); + painter->drawLine(brect.topRight(), brect.bottomLeft()); + } +} + +QRectF TankItem::boundingRect() const +{ + return QRectF(-20.0, -10.0, 40.0, 20.0); +} + +qreal TankItem::direction() const +{ + return m_currentDirection; +} + +void TankItem::setDirection(qreal newDirection) +{ + int fullRotations = int(newDirection) / 360; + newDirection -= fullRotations * 360.0; + + qreal diff = newDirection - m_currentDirection; + m_currentDirection = newDirection; + rotate(diff); +} + +qreal TankItem::distanceToObstacle(QGraphicsItem **obstacle) const +{ + qreal dist = sqrt(pow(scene()->sceneRect().width(), 2) + pow(scene()->sceneRect().height(), 2)); + + qreal a = m_currentDirection * M_PI / 180.0; + + qreal yd = dist * sin(a); + qreal xd = dist * sin(M_PI / 2.0 - a); + + QPointF requestedPosition = pos() + QPointF(xd, yd); + QGraphicsItem *collidedItem = 0; + QPointF nextPosition = tryMove(requestedPosition, 0, &collidedItem); + if (collidedItem != 0) { + if (obstacle != 0) + *obstacle = collidedItem; + + QPointF d = nextPosition - pos(); + return sqrt(pow(d.x(), 2) + pow(d.y(), 2)); + } else { + return 0.0; + } +} + +qreal TankItem::distanceToObstacle() const +{ + return distanceToObstacle(0); +} + |