/*

     File: APLSpriteAnchors.m

 Abstract: 

 This scene shows how to use anchor points to move the sprite's image relative to its position.

  Version: 1.0

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 */

#import "APLSpriteAnchors.h"

#import "APLBlendingSprites.h"

@implementation APLSpriteAnchors

- (void)createSceneContents

{

    [self addAnchorGrid];

    [self addAnimatedAnchor];

    [self addSceneDescriptionLabel];

}

- (void)addAnchorGrid

{

    /*

     Creates a 2-dimensional grid of sprites, each with a different anchor point.

     It shows how a sprite's image moves when the anchor point changes.

     */

    for (int x = 0; x <= 4; x++)

    {

        for (int y = 0; y<= 4; y++)

        {

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

            [sprite setScale: 0.25];

            sprite.anchorPoint = CGPointMake(0.25*x, 0.25*y);

            sprite.position = CGPointMake(CGRectGetMidX(self.frame)-400+100*x,

                                        CGRectGetMidY(self.frame)-200+100*y);

            [self addChild:sprite];

            [self addAnchorDotToSprite: sprite];

        }

    }

}

- (void)addAnimatedAnchor

{

    /*

     Creates a sprite and animates its anchor point.

     */

    SKSpriteNode *animatedSprite= [SKSpriteNode spriteNodeWithImageNamed:@"rocket.png"];

    animatedSprite.position = CGPointMake(CGRectGetMidX(self.frame)+200,

                                        CGRectGetMidY(self.frame));

    animatedSprite.anchorPoint = CGPointZero;

    [self addChild:animatedSprite];

    [self addAnchorDotToSprite: animatedSprite];

    [animatedSprite runAction:[self newAnimateAnchorAction]];

}

- (void) addAnchorDotToSprite: (SKSpriteNode*) sprite

{

    // We use a shape node for the dot, using a simple circle.

    SKShapeNode *dot = [[SKShapeNode alloc] init];

    CGMutablePathRef myPath = CGPathCreateMutable();

    CGPathAddArc(myPath, NULL, 0, 0, 3, 0, M_2_PI, YES);

    CGPathCloseSubpath(myPath);

    dot.path = myPath;

    dot.fillColor = [SKColor blueColor];

    dot.lineWidth = 0.0;

    [sprite addChild:dot];

}

- (SKAction *)newAnimateAnchorAction

{

    // Normally, you can't directly animate an anchor point, but you can build a custom action to so do.

    // This method builds a bunch of custom actions, then combines them in a repeating sequence.

    SKAction *moveAnchorRight = [SKAction customActionWithDuration:1.0 actionBlock:^(SKNode *node, CGFloat elapsedTime) {

        SKSpriteNode *sprite = (SKSpriteNode*) node;

        sprite.anchorPoint = CGPointMake(elapsedTime,0.0);

    }];

    SKAction *moveAnchorUp = [SKAction customActionWithDuration:1.0 actionBlock:^(SKNode *node, CGFloat elapsedTime) {

        SKSpriteNode *sprite = (SKSpriteNode*) node;

        sprite.anchorPoint = CGPointMake(1.0,elapsedTime);

    }];

    SKAction *moveAnchorLeft = [SKAction customActionWithDuration:1.0 actionBlock:^(SKNode *node, CGFloat elapsedTime) {

        SKSpriteNode *sprite = (SKSpriteNode*) node;

        sprite.anchorPoint = CGPointMake(1.0-elapsedTime,1.0);

    }];

    SKAction *moveAnchorDown = [SKAction customActionWithDuration:1.0 actionBlock:^(SKNode *node, CGFloat elapsedTime) {

        SKSpriteNode *sprite = (SKSpriteNode*) node;

        sprite.anchorPoint = CGPointMake(0,1.0-elapsedTime);

    }];

    SKAction *sequence = [SKAction sequence:@[moveAnchorRight, moveAnchorUp, moveAnchorLeft, moveAnchorDown]];

    return [SKAction repeatActionForever:sequence];

}

- (void)addSceneDescriptionLabel

{

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

    myLabel.text = NSLocalizedString(@"The dots mark the actual position of each sprite node.", @"");

    myLabel.fontSize = 18;

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

    [self addChild:myLabel];

}

@end