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POShooting the targets - Cocos2D
 

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    <p>I was going through the <a href="http://www.raywenderlich.com/352/how-to-make-a-simple-iphone-game-with-cocos2d-tutorial" rel="nofollow">tutorial</a> which guides us to create a simple game in which user can shoot a ninjas.<br> In the tutorial the shooting projectile has been implemented as follws : </p> <pre><code>- (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]; // Set up initial location of projectile CGSize winSize = [[CCDirector sharedDirector] winSize]; CCSprite *projectile = [CCSprite spriteWithFile:@"Projectile.png" rect:CGRectMake(0, 0, 20, 20)]; projectile.position = ccp(20, winSize.height/2); // Determine offset of location to projectile int offX = location.x - projectile.position.x; int offY = location.y - projectile.position.y; // Bail out if we are shooting down or backwards if (offX &lt;= 0) return; // Ok to add now - we've double checked position [self addChild:projectile]; // Determine where we wish to shoot the projectile to int realX = winSize.width + (projectile.contentSize.width/2); float ratio = (float) offY / (float) offX; int realY = (realX * ratio) + projectile.position.y; CGPoint realDest = ccp(realX, realY); // Determine the length of how far we're shooting int offRealX = realX - projectile.position.x; int offRealY = realY - projectile.position.y; float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY)); float velocity = 480/1; // 480pixels/1sec float realMoveDuration = length/velocity; // Move projectile to actual endpoint [projectile runAction:[CCSequence actions: [CCMoveTo actionWithDuration:realMoveDuration position:realDest], [CCCallFuncN actionWithTarget:self selector:@selector(spriteMoveFinished:)], nil]]; } </code></pre> <p>All what is confusing about this part is the calculation of ratio and its purpose.Why we have to calculate the ratio in the above case or let me put it in this way, what does ratio signify? </p> <p>Regards,<br> Stone</p>
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