cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   anothernoobie
   Member

   I'm relatively new to XCode and Obj C programming but I've been developing games for years now. It was only a month ago that I started learning game development for the iPhone/iPod and I went with Cocos 2D because its a pretty neat lib and it suits my needs well. However, being a total noob, I'm now stuck on tracking touch events w/in my app. I have a class "PlayerShip.m" and I wanted to rotate this ship from my "MainScene.m" file--how do I make a reference to it? Can you help a newbie? Below is my code:

   PlayerShip.m:

   #import "PlayerShip.h"
   #import "Sprite.h"
   #import "cocos2d.h"
   
   @implementation PlayerShip
   
   - (id) init
   {
       self = [super init];
       if (self != nil) {
           Sprite * ship01 = [Sprite spriteWithFile:@"ship01.png"];
   		ship01.position = ccp(240, 160);
           [self addChild:ship01];
   		//animate ship infinitely
   		id anim01 = [[[Animation alloc] initWithName:@"lit01" delay:1/6.0] autorelease];
   		[anim01 addFrame:@"ship01.png"];
   		[anim01 addFrame:@"ship01a.png"];
   		[anim01 addFrame:@"ship01b.png"];
   		[anim01 addFrame:@"ship01c.png"];
   		id ship01Action = [Animate actionWithAnimation: anim01];
   		id repeat01Action = [RepeatForever actionWithAction:ship01Action];
   		[ship01 runAction:repeat01Action];
   		//rotate ship
   		id myRotAction01 = [RotateBy actionWithDuration:12 angle:360];
   		id RepeatAction01 = [RepeatForever actionWithAction: myRotAction01];
   		[ship01 runAction: RepeatAction01];
   
   	}
       return self;
   }

   And below is my MainScene.m's touch event code:

   - (BOOL)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
     int i;
     NSSet *allTouches = [event allTouches];
     int touchcount = [allTouches count];
   
     BOOL handled = kEventIgnored;
   
     for (i = 0; i < touchcount; i++)
     {
       UITouch *touch = [[allTouches allObjects] objectAtIndex:i];
       if(touch == nil)
       {
         continue;
       }
   
       CGPoint point = [touch locationInView: [touch view]];
       point =  [[Director sharedDirector] convertCoordinate: point];
   
       CGRect rectLeft = CGRectMake(0, 0, 180, 320);
   	CGRect rectRight = CGRectMake(300, 0, 480, 320);
       if(CGRectContainsPoint(rectLeft, point)){
           Alien *alienship = [Alien node];
           alienship.position = ccp(point.x, point.y);
           [self addChild:alienship];
   		//move alien towards Earth
   		int speed = 1 + arc4random() % 12;
   		id moveAction = [MoveTo actionWithDuration:speed position:ccp(240, 160)];
   		[alienship runAction:moveAction];
           //PLAYER SHIP SHOULD ROTATE LEFT HERE
   
   		handled = kEventHandled;
       }
       else if(CGRectContainsPoint(rectRight, point)){
           Alien *alienship = [Alien node];
           alienship.position = ccp(point.x, point.y);
           [self addChild:alienship];
   		//move alien towards Earth
   		int speed = 1 + arc4random() % 12;
   		id moveAction = [MoveTo actionWithDuration:speed position:ccp(240, 160)];
   		[alienship runAction:moveAction];
   		//PLAYER SHIP SHOULD ROTATE RIGHT HERE
   
   		handled = kEventHandled;
       }
     }
   	return handled;
   }

   How can I rotate the ship to the appropriate direction when the left or right RECT is touched? Any help would be greatly appreciated! :)

   Posted 2 years ago #
2. 

   gravity
   Member

   What I would do (in other words, take it for what it's worth from another newbie):

   Include a pointer to a playerShip instantiation:

   > PlayerShip *player = [[PlayerShip alloc] init];

   And put a @property for the sprite, ship01, in your PlayerShip class so that you can access it within your mainsScene with a pointer:

   > Sprite *playerSprite = player.ship01;

   And setup an action to rotate the sprite:

   > id action = [RotateBy actionWithDuration:time angleOrSomething:angle]

   and tell the sprite to run the action:

   > [playerSprite runAction:action];

   and then update whatever else you need to change when you rotate your ship (like the direction a laser would fire).

   Hope this helps. Note: like I said, I'm also a newbie, so if anybody wants to correct me or give tips on how to make that better, thanks ahead of time.

   Posted 2 years ago #
3. 

   anothernoobie
   Member

   Thanks! I'll try your suggestion later tonight. :)

   Posted 2 years ago #

RSS feed for this topic

Reply

You must log in to post.