/*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2009 Kristian Lehmann <email@thexception.net>

 * Copyright (c) 2009-2011 Andrey Korotaev <unC0Rr@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; version 2 of the License

 *

 * 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA

 */

#include "bgwidget.h"

SpritePosition::SpritePosition(QWidget * parent, int sh)

{

    wParent = parent;

    iSpriteHeight = sh;

    reset();

}

SpritePosition::~SpritePosition()

{

}

void SpritePosition::move()

{

    fX += fXMov;

    fY += fYMov;

    iAngle += 4;

    if (iAngle >= 360) iAngle = 0;

    if (fY > wParent->height()) reset();

}

void SpritePosition::reset()

{

    fY = -1 * iSpriteHeight;

    fX = (qrand() % ((int)(wParent->width() * 1.5))) - wParent->width()/2;

    fYMov = ((qrand() % 400)+300) / 100.0f;

    fXMov = fYMov * 0.2f+((qrand()%100)/100.0f * 0.6f); //so between 0.2 and 0.6, or 0.5 +/- 0.3

    iAngle = qrand() % 360;

}

QPoint SpritePosition::pos()

{

    return QPoint((int)fX,(int)fY);

}

int SpritePosition::getAngle()

{

    return iAngle;

}

void SpritePosition::init()

{

    fY = qrand() % (wParent->height() + 1);

    fX = qrand() % (wParent->width() + 1);

}

BGWidget::BGWidget(QWidget * parent) : QWidget(parent)

{

    setAttribute(Qt::WA_NoSystemBackground, true);

    sprite.load(":/res/Star.png");

    setAutoFillBackground(false);

    for (int i = 0; i < SPRITE_MAX; i++) spritePositions[i] = new SpritePosition(this, sprite.height());

    for (int i = 0; i < 360; i++)

    {

        rotatedSprites[i] = new QImage(sprite.width(), sprite.height(), QImage::Format_ARGB32);

        rotatedSprites[i]->fill(0);

        QPoint translate(sprite.width()/2, sprite.height()/2);

        QPainter p;

        p.begin(rotatedSprites[i]);

    //  p.setRenderHint(QPainter::Antialiasing);

        p.setRenderHint(QPainter::SmoothPixmapTransform);

        p.translate(translate.x(), translate.y());

        p.rotate(i);

        p.translate(-1*translate.x(), -1*translate.y());

        p.drawImage(0, 0, sprite);

    }

    timerAnimation = new QTimer();

    connect(timerAnimation, SIGNAL(timeout()), this, SLOT(animate()));

    timerAnimation->setInterval(ANIMATION_INTERVAL);

}

BGWidget::~BGWidget()

{

    for (int i = 0; i < SPRITE_MAX; i++) delete spritePositions[i];

    for (int i = 0; i < 360; i++) delete rotatedSprites[i];

    delete timerAnimation;

}

void BGWidget::paintEvent(QPaintEvent *event)

{

    Q_UNUSED(event);

    QPainter p;

    p.begin(this);

    //p.setRenderHint(QPainter::Antialiasing);

    for (int i = 0; i < SPRITE_MAX; i++)

    {

        QPoint point = spritePositions[i]->pos();

        p.drawImage(point.x(), point.y(), *rotatedSprites[spritePositions[i]->getAngle()]);

    }

    p.end();

}

void BGWidget::animate()

{

    for (int i = 0; i < SPRITE_MAX; i++)

    {

        // bottom edge of star *seems* clipped, but in fact, if I switch to just plain old repaint()/update() it is still clipped - artifact of transform?  As for 5, is arbitrary number. 4 was noticeably clipping, 5 seemed same as update() - I assume extra room is due to rotation and value really should be calculated proportional to width/height

        update(spritePositions[i]->pos().x(),spritePositions[i]->pos().y(), sprite.width()+5, sprite.height()+5);

        spritePositions[i]->move();

    }

}

void BGWidget::startAnimation()

{

    timerAnimation->start();

}

void BGWidget::stopAnimation()

{

    timerAnimation->stop();

}

void BGWidget::init()

{

    for (int i = 0; i < SPRITE_MAX; i++) spritePositions[i]->init();

}