ghostitem.cpp

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/*
 * Copyright 2007-2008 Thomas Gallinari <tg8187@yahoo.fr>
 * Copyright 2007-2008 Pierre-Benoit Besse <besse.pb@gmail.com>
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of 
 * the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "ghostitem.h"
#include "game.h"

GhostItem::GhostItem(Ghost* p_model) : CharacterItem (p_model) {
    connect(p_model, SIGNAL(stateChanged()), this, SLOT(updateState()));

    // Calculations for the duration of blinking stuff
    int blinkTimerDuration = (int)(500 * Game::s_durationRatio);
    int startBlinkingTimerDuration = (int)(Game::s_preyStateDuration*Game::s_durationRatio - 5*blinkTimerDuration);

    // Define the timer which tells the ghosts to start blinking when about to leave prey state
    m_startBlinkingTimer = new QTimer(this);
    m_startBlinkingTimer->setInterval(startBlinkingTimerDuration);
    m_startBlinkingTimer->setSingleShot(true);
    connect(m_startBlinkingTimer, SIGNAL(timeout()), this, SLOT(startBlinking()));

    // Define the timer which sets the blinking frequency
    m_blinkTimer = new QTimer(this);
    m_blinkTimer->setInterval(blinkTimerDuration);
    connect(m_blinkTimer, SIGNAL(timeout()), this, SLOT(blink()));
}

GhostItem::~GhostItem() {
    delete m_startBlinkingTimer;
}

void GhostItem::updateBlinkTimersDuration() {
    // Set the timers duration depending on the prey state duration
    int blinkTimerDuration = (int)( (Game::s_preyStateDuration*Game::s_durationRatio) / 20);
    int startBlinkingTimerDuration = (int)(blinkTimerDuration * 15);
    m_blinkTimer->setInterval(blinkTimerDuration);
    m_startBlinkingTimer->setInterval(startBlinkingTimerDuration);
}

void GhostItem::update(qreal p_x, qreal p_y) {
    // Compute the top-right coordinates of the item
    qreal x = p_x - boundingRect().width() / 2;
    qreal y = p_y - boundingRect().height() / 2;
    // Updates the view coordinates
    setPos(x, y);
}

void GhostItem::updateState() {
    // Stop timers
    if (m_startBlinkingTimer->isActive()) {
        m_startBlinkingTimer->stop();
    }
    if (m_blinkTimer->isActive()) {
        m_blinkTimer->stop();
    }
    switch (((Ghost*)getModel())->getState()) { 
        case Ghost::PREY:
            updateBlinkTimersDuration();
            setElementId("scaredghost");
            m_startBlinkingTimer->start();
            // The ghosts are now weaker than the kapman, so they are under him
            setZValue(1);
            break;
        case Ghost::HUNTER:
            setElementId( ((Ghost*)getModel())->getImageId() );
            // The ghosts are stronger than the kapman, they are above him
            setZValue(3);
            break;
        case Ghost::EATEN:
            setElementId("ghosteye");
            // The ghosts are now weaker than the kapman, so they are under him
            setZValue(1);
            break;
    }
}

void GhostItem::blink() {
    CharacterItem::blink();
    if (m_nbBlinks % 2 == 0) {
        setElementId("scaredghost");
    } else {
        setElementId("whitescaredghost");
    }
}