Cocos2d Shooting Method - xcode

Question

ok i am new to coding and cocos2d
i have this shooting code that will fire a projectile and when i try to fire on the left side of the screen it the projectile is fired down and right from the position of the ball?
heres my GamePlay.m
#import "GamePlay.h"
CCSprite *player;
CCSprite *grass;
CCSprite *gameBg;
#implementation GamePlay
+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];
// 'layer' is an autorelease object.
GamePlay *layer = [GamePlay node];
// add layer as a child to scene
[scene addChild: layer];
// return the scene
return scene;
}
-(id) init
{
// always call "super" init
// Apple recommends to re-assign "self" with the "super" return value
if( (self=[super init]))
{
self.isTouchEnabled = YES;
gameBg = [CCSprite spriteWithFile:#"backgroundGame1.png"];
gameBg.position = ccp(240,160);
[self addChild:gameBg];
grass = [CCSprite spriteWithFile:#"grass.jpg"];
grass.position = ccp(240,25);
[self addChild:grass];
player = [CCSprite spriteWithFile:#"ball.png"];
player.position = ccp(27,95);
[self addChild:player];
x = 5;
y = 5;
}
return self;
}
- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *myTouch = [touches anyObject];
CGPoint point = [myTouch locationInView:[myTouch view]];
point = [[CCDirector sharedDirector] convertToGL:point];
if (point.x > 240 && point.y < 150)
{
[self unschedule:#selector(moveLeft)];
[self schedule:#selector(moveRight) interval:.01];
}
if (point.x < 240 && point.y < 150)
{
[self unschedule:#selector(moveRight)];
[self schedule:#selector(moveLeft) interval:.01];
}
NSLog(#"Touch Began");
// Choose one of the touches to work with
if (point.y > 150)
{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
CGSize winSize = [[CCDirector sharedDirector]winSize];
CCSprite *projectile = [CCSprite spriteWithFile:#"projectile.png"];
projectile.position = ccp(player.position.x,player.position.y);
int offX = location.x - projectile.position.x;
int offY = location.y - projectile.position.y;
[self addChild:projectile];
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);
int offRealX = realX - projectile.position.x;
int offRealY = realY - projectile.position.y;
float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY));
float velocity = 480/1;
float realMoveDuration = length/velocity;
[projectile runAction:[CCMoveTo actionWithDuration:realMoveDuration position:realDest]];
NSLog(#"Shoot!");
}
}
-(void)ccTouchesEnded:(NSSet *) touches withEvent:(UIEvent *)event
{
UITouch *myTouch = [touches anyObject];
CGPoint point = [myTouch locationInView:[myTouch view]];
point = [[CCDirector sharedDirector] convertToGL:point];
[self unschedule:#selector(moveLeft)];
[self unschedule:#selector(moveRight)];
NSLog(#"Touch Ended");
}
-(void) spriteMoveFinished: (id) sender
{
}
-(void)moveLeft
{
player.position = ccp(player.position.x - x, player.position.y);
if (player.position.x < 15)
{
player.position = ccp(16,player.position.y);
}
}
-(void)moveRight
{
player.position = ccp(player.position.x + x, player.position.y);
if (player.position.x > 465)
{
player.position = ccp(464,player.position.y);
}
}
#end
this is the shooting method (i think it has something to do with the x & y offset?)
if (point.y > 150)
{
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInView:[touch view]];
location = [[CCDirector sharedDirector] convertToGL:location];
CGSize winSize = [[CCDirector sharedDirector]winSize];
CCSprite *projectile = [CCSprite spriteWithFile:#"projectile.png"];
projectile.position = ccp(player.position.x,player.position.y);
int offX = location.x - projectile.position.x;
int offY = location.y - projectile.position.y;
[self addChild:projectile];
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);
int offRealX = realX - projectile.position.x;
int offRealY = realY - projectile.position.y;
float length = sqrtf((offRealX*offRealX)+(offRealY*offRealY));
float velocity = 480/1;
float realMoveDuration = length/velocity;
[projectile runAction:[CCMoveTo actionWithDuration:realMoveDuration position:realDest]];
NSLog(#"Shoot!");
}

Answer 1

The best resource is here
Just give it a try.
Cheers

Answer 2

I found the answer here Projectiles/Bullets direction Cocos2d
you needed to do this,
// After adding the projectile:
[self addChild:projectile];
// Add a scalar float:
float scalarX = 1.0f;
// And make it negative if the touch is left of the character:
if (offX < 0.0f) scalar = -1.0f;
// Then just multiply the realX by this scalar to make it point the correct way
int realX = scalar * (winSize.width + (projectile.contentSize.width/2));