here is an example. This brings back my mapNode to the left border, for example when a LHS menu is popped out. Move duration and acceleration are computed as a function of the expected displacement :
- (void)setLeftClamp:(float)leftClamp {
_leftClamp = leftClamp;
CGPoint currentPosition = self.mapNode.position;
if (currentPosition.x > self.maxX) {
// ease right back in position
CGPoint delta = ccp (self.maxX - currentPosition.x, 0);
id move = [CCMoveBy actionWithDuration:[self moveDuration:delta] position:delta];
id ease = [CCEaseIn actionWithAction:move rate:[self moveAcceleration:delta]];
id delay = [CCDelayTime actionWithDuration:.1f];
id easeAndCenter = [CCSequence actions:ease, delay, [CCCallFunc actionWithTarget:self selector:@selector(onMoveComplete)], nil];
[self.mapNode runAction:easeAndCenter];
targetMapLocation_ = ccpAdd(self.mapNode.position, delta);
mapDisplacement_ = delta;
isMapMoving_ = YES;
}
}