/*

     File: APLBlendingSprites.m

 Abstract: 

 This scene shows how to use a blend mode other than the default blend mode.

  Version: 1.0

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 */

#import "APLBlendingSprites.h"

#import "APLAnimatingSprites.h"

// Useful random functions.

static inline CGFloat myRandf()

{

    return rand() / (CGFloat) RAND_MAX;

}

static inline CGFloat myRand(CGFloat low, CGFloat high)

{

    return myRandf() * (high - low) + low;

}

@implementation APLBlendingSprites

- (void)createSceneContents

{

    [self addSceneDescriptionLabel];

    /*

     The scene is a node, so it can run actions. In this scene, it periodically creates

     a new light and adds it to itself.

     */

    [self runAction: [self newAddLightAction]];

}

- (SKAction *)newAddLightAction

{

    // This sequence uses a custom method to add the light, then it waits for a random period of time.

    SKAction *sequence = [SKAction sequence: @[

                            [SKAction performSelector:@selector(addLight) onTarget:self],

                            [SKAction waitForDuration:0.50 withRange:0.10]

                            ]];

    return [SKAction repeatActionForever:sequence];

}

- (void)addLight

{

/*

    Create a new light and add it to the scene. The light uses an additive blend mode.

 */

    SKSpriteNode* sprite = [SKSpriteNode spriteNodeWithImageNamed:@"spark.png"];

    sprite.position = CGPointMake(myRand(-150,150)+CGRectGetMidX(self.frame),

                                  myRand(-150,150)+CGRectGetMidY(self.frame));

    sprite.blendMode = SKBlendModeAdd;

    // these values were chosen only for the aesthetic effect.

    sprite.alpha = 0.5;

    [sprite setScale:2.0];

    [self addChild:sprite];

}

- (void)addSceneDescriptionLabel

{

    SKLabelNode *myLabel = [SKLabelNode labelNodeWithFontNamed:@"Helvetica"];

    myLabel.text = NSLocalizedString(@"These textured sprite nodes are combined using an additive blend.", @"");

    myLabel.fontSize = 18;

    myLabel.position = CGPointMake(CGRectGetMidX(self.frame),100);

    [self addChild:myLabel];

}

@end