void CCParallaxScrollNode::updateWithVelocity(const CCPoint &vel, float dt) {
CCSize screen = CCDirector::sharedDirector()->getWinSize();
CCPoint vel2 = ccpMult(vel, PTM_RATIO);
for (int i=scrollOffsets->num - 1; i >= 0; i--) {
CCParallaxScrollOffset *scrollOffset = (CCParallaxScrollOffset*)scrollOffsets->arr[i];
CCNode *child = scrollOffset->getChild();
CCPoint relVel = ccpMult(scrollOffset->getRelVelocity(), PTM_RATIO);
CCPoint totalVel = ccpAdd(vel2, relVel);
CCPoint tmp = ccpMult(totalVel, dt);
CCPoint offset = ccpCompMult(tmp, scrollOffset->getRatio());
child->setPosition(ccpAdd(child->getPosition(), offset));
if ( (vel2.x < 0 && child->getPosition().x + child->getContentSize().width < 0) ||
(vel2.x > 0 && child->getPosition().x > screen.width) ) {
child->setPosition(ccpAdd(child->getPosition(), ccp(-SIGN(vel2.x) * fabs(scrollOffset->getScrollOffset().x), 0)));
}
// Positive y indicates upward movement in cocos2d
if ( (vel2.y < 0 && child->getPosition().y + child->getContentSize().height < 0) ||
(vel2.y > 0 && child->getPosition().y > screen.height) ) {
child->setPosition(ccpAdd(child->getPosition(), ccp(0, -SIGN(vel2.y) * fabs(scrollOffset->getScrollOffset().y))));
}
}
}
void CCParallaxScrollNode::updateWithYPosition(float y, float dt)
{
for (int i=scrollOffsets->num - 1; i >= 0; i--) {
CCParallaxScrollOffset *scrollOffset = (CCParallaxScrollOffset*)scrollOffsets->arr[i];
CCNode *child = scrollOffset->getChild();
float offset = y * scrollOffset->getRatio().y;//ccpCompMult(pos, scrollOffset.ratio);
child->setPosition(ccp(child->getPosition().x, scrollOffset->getOrigPosition().y + offset));
}
}
void CCParallaxScrollNode::removeChild(CCSprite *node, bool cleanup)
{
for (int i=0; i < scrollOffsets->num; i++) {
CCParallaxScrollOffset *scrollOffset = (CCParallaxScrollOffset*)scrollOffsets->arr[i];
if(scrollOffset->getChild()->isEqual(node)) {
ccArrayRemoveObjectAtIndex(scrollOffsets, i);
break;
}
}
if (batch) {
batch->removeChild(node, cleanup);
}
}
