How to give effect like throwing a ball in a Bucket? - iphone

Question

I am new to Cocos2d and hence not aware of most of the classes and also the functions. In my application, I want to implement a module like touching and dragging the ball in a direction of a barrel will pass the ball and will put the ball in the barrel. I am able to pass the ball in the direction but then it just would go out of the screen following the coordinates(x.y).
- (void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
// Choose one of the touches to work with
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
// Determine offset of location to projectile
int offX = location.x - ball.position.x;
int offY = location.y - ball.position.y;
// Bail out if we are shooting down or backwards
if (offX <= 0)
return;
// Determine where we wish to shoot the projectile to
int realX = winSize.width + (ball.contentSize.height/2);
float ratio = (float) offY / (float) offX;
int realY = (realX * ratio) + ball.position.y;
CGPoint realDest = ccp(realX, realY);
if(realX>=320)
realX = 320;
if(realY>=480)
realY = 480;
CGPoint realDest = ccp(realX, realY);
int good = goodBarrel.position.x;
int bad = badBarrel.position.x;
int destY = realDest.x;
if(destY<=good)
destY = good;
if(destY>=bad)
destY = bad;
realDest.x = destY+10;
// Determine the length of how far we're shooting
int offRealX = realX - ball.position.x;
int offRealY = realY - ball.position.y;
float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY));
float velocity = 480/1; // 480pixels/1sec
float realMoveDuration = length/velocity;
// Move projectile to actual endpoint
[ball runAction:[CCSequence actions:
[CCMoveTo actionWithDuration:realMoveDuration position:realDest],
[CCCallFuncN actionWithTarget:self selector:#selector(spriteMoveFinished:)],
nil]];
}
I need to do something like it will get the idea of barrels position and finding the top of the barrel and will put the ball in the center of the barrel and also while moving the ball,the size of the ball gets reduced to give effect of throwing the ball to a distant place. GoodBarrel and BadBarrel are the two barrels I have put in the opposite of ball to put the ball in the same. Is there any function or method I can work on?

Answer 1

Immediately after the [ball runAction: .... ]; line, you can run another action on the same object, simultaneously. Add a
[ball runAction:[CCScaleTo actionWithDuration:realMoveDuration scale:0.4f];
both actions will complete at the same time, providing the 'illusion' of distance you are seeking to create.

Answer 2

You can use collision detection, or in other words check to see if the CGRect of ball and barrel intersect
- (void)collisionDetection:(ccTime)dt{
CGRect ballRect = CGRectMake(
ball.position.x,
ball.position.y,
10,
10);
CGRect barrelRect = CGRectMake(
barrel.position.x,
barrel.position.y,
50,
10);
if (CGRectIntersectsRect(ballRect, barrelRect))
{
// Run Animation of Ball Dropping in the Barrel
[self removeChild:ball cleanup: YES];
}
}
hope this is what you need.