Level.m

/*
 * CocosBuilder: http://www.cocosbuilder.com
 *
 * Copyright (c) 2012 Zynga Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#import "Level.h"
#import "Dragon.h"
#import "GameObject.h"

#define kCJScrollFilterFactor 0.1
#define kCJDragonTargetOffset 80

@implementation Level

- (void) onEnter
{
    [super onEnter];
    
    // Schedule a selector that is called every frame
    [self schedule:@selector(update:)];
    
    // Make sure touches are enabled
    self.isTouchEnabled = YES;
}

- (void) onExit
{
    [super onExit];
    
    // Remove the scheduled selector
    [self unscheduleAllSelectors];
}

- (void) update:(ccTime)delta
{
    // Iterate through all objects in the level layer
    CCNode* child;
    CCARRAY_FOREACH(self.children, child)
    {
        // Check if the child is a game object
        if ([child isKindOfClass:[GameObject class]])
        {
            GameObject* gameObject = (GameObject*)child;
            
            // Update all game objects
            [gameObject update];
            
            // Check for collisions with dragon
            if (gameObject != dragon)
            {
                if (ccpDistance(gameObject.position, dragon.position) < gameObject.radius + dragon.radius)
                {
                    // Notify the game objects that they have collided
                    [gameObject handleCollisionWith:dragon];
                    [dragon handleCollisionWith:gameObject];
                }
            }
        }
    }
    
    // Check for objects to remove
    NSMutableArray* gameObjectsToRemove = [NSMutableArray array];
    CCARRAY_FOREACH(self.children, child)
    {
        if ([child isKindOfClass:[GameObject class]])
        {
            GameObject* gameObject = (GameObject*)child;
            
            if (gameObject.isScheduledForRemove)
            {
                [gameObjectsToRemove addObject:gameObject];
            }
        }
    }
    
    for (GameObject* gameObject in gameObjectsToRemove)
    {
        [self removeChild:gameObject cleanup:YES];
    }
    
    // Adjust the position of the layer so dragon is visible
    float yTarget = kCJDragonTargetOffset - dragon.position.y;
    CGPoint oldLayerPosition = self.position;
    
    float xNew = oldLayerPosition.x;
    float yNew = yTarget * kCJScrollFilterFactor + oldLayerPosition.y * (1.0f - kCJScrollFilterFactor);
    
    self.position = ccp(xNew, yNew);
}

- (void) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch* touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInView: [touch view]];
    
    dragon.xTarget = touchLocation.x;
}

- (void) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch* touch = [touches anyObject];
    CGPoint touchLocation = [touch locationInView: [touch view]];
    
    dragon.xTarget = touchLocation.x;
}

@end