--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/ui/widget/bgwidget.cpp	Wed Sep 28 19:27:56 2011 +0200
@@ -0,0 +1,143 @@
+/*
+ * 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();
+}