SpriteKit component

GameControls.h

//
//  GameControls.h
//  Hiss
//
//  Created by Chad Scira on 6/21/14.
//  Copyright (c) 2014 Chad Scira. All rights reserved.
//

#import <SpriteKit/SpriteKit.h>

@class GameControls;
@protocol GameControlsDelegate <NSObject>
@optional
-(void)controlButtonPressed: (NSString *)button;
@end

@interface GameControls : SKNode <GameControlsDelegate> {
    SKAction *fadePulseAction;
    
    SKSpriteNode *upArrow;
    SKSpriteNode *rightArrow;
    SKSpriteNode *downArrow;
    SKSpriteNode *leftArrow;
    
    NSMutableArray *buttons;
}

@property (nonatomic, weak) id <GameControlsDelegate> delegate;
@property CGSize size;

+(GameControls*)controlsWithSize: (CGSize)size;
@end

GameControls.m

//
//  GameControls.m
//  Hiss
//
//  Created by Chad Scira on 6/21/14.
//  Copyright (c) 2014 Chad Scira. All rights reserved.
//

#import "GameControls.h"
#import "SKTween.h"

@implementation GameControls

-(id)initWithSize: (CGSize)size {
    if (self = [self init]) {
        buttons = [[NSMutableArray alloc]init];
        
        fadePulseAction = [SKTween tweenSet:@[
                                              @{@"duration": @.2, @"finish": @{@"fadeAlphaTo": @.8}},
                                              @{@"delay": @.1, @"duration": @.2, @"finish": @{@"fadeAlphaTo": @.4}}]];
        
        self.userInteractionEnabled = YES;
        
        self.size = size;
        [self addArrows];
    }
    
    return self;
}

+(GameControls*)controlsWithSize: (CGSize)size {
    GameControls *controls = [[self alloc] initWithSize:size];
    return controls;
}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    for (UITouch *touch in touches) {
        CGPoint point= [touch locationInNode: self];
        NSString *name;
        
        for (SKShapeNode *button in buttons) {
            if ([[UIBezierPath bezierPathWithCGPath: button.path] containsPoint: CGPointMake(point.x - button.position.x, point.y - button.position.y)]) {
                name = button.name;
                break;
            }
        }
        
//        NSLog(@"button pressed: %@ %f,%f %lu", name, point.x, point.y, (unsigned long)touches.count);
        
        if ([name isEqualToString:@"up"]) {
            [self.delegate controlButtonPressed: name];
            [upArrow runAction: fadePulseAction];
        } else if ([name isEqualToString:@"right"]) {
            [self.delegate controlButtonPressed: name];
            [rightArrow runAction: fadePulseAction];
        } else if ([name isEqualToString:@"down"]) {
            [self.delegate controlButtonPressed: name];
            [downArrow runAction: fadePulseAction];
        } else if ([name isEqualToString:@"left"]) {
            [self.delegate controlButtonPressed: name];
            [leftArrow runAction: fadePulseAction];
        }
    }
}

-(CGPoint)getNextPointWith: (CGPoint) pointA andPoint: (CGPoint) pointB atHeight: (float) height {
    float slope = atan2(pointB.y - pointA.y, pointB.x - pointA.x);
    float angle = M_PI - (slope + M_PI/2);
    float opposite = height;
    float adjacent = tan(angle) * opposite;
    float hypotenuse = sqrt(pow(opposite, 2) + pow(adjacent, 2));
    
    return CGPointMake(pointA.x + cos(slope) * hypotenuse, pointB.y + sin(slope) * hypotenuse);
}

-(void)addArrows {
    float scale = .25;
    float xButtonMargin = 5;
    
    SKShapeNode *overlayShape;
    UIBezierPath *overlayBezierPath;

    CGRect centerRect = CGRectMake(self.size.width/2 - 35/2, self.size.height/2 - 15, 35, 30);
    CGPoint centerRectCenterPoint = CGPointMake(centerRect.origin.x + centerRect.size.width/2, centerRect.origin.y + centerRect.size.height/2);
    
    // canculate points
    CGPoint bottomRight = [self getNextPointWith:centerRectCenterPoint andPoint:CGPointMake(centerRectCenterPoint.x + centerRect.size.width/2, centerRectCenterPoint.y + centerRect.size.height/2) atHeight:self.size.height/2];
    CGPoint bottomLeft = [self getNextPointWith:centerRectCenterPoint andPoint:CGPointMake(centerRectCenterPoint.x - centerRect.size.width/2, centerRectCenterPoint.y + centerRect.size.height/2) atHeight:self.size.height/2];
    CGPoint topRight = [self getNextPointWith:centerRectCenterPoint andPoint:CGPointMake(centerRectCenterPoint.x + centerRect.size.width/2, centerRectCenterPoint.y - centerRect.size.height/2) atHeight:self.size.height/2];
    CGPoint topLeft = [self getNextPointWith:centerRectCenterPoint andPoint:CGPointMake(centerRectCenterPoint.x - centerRect.size.width/2, centerRectCenterPoint.y - centerRect.size.height/2) atHeight:self.size.height/2];
    
    // up arrow
    upArrow = [SKSpriteNode spriteNodeWithImageNamed:@"pad-up-arrow"];
    [upArrow setScale: scale];
    upArrow.alpha = .6;
    upArrow.name = @"up";
    upArrow.position = CGPointMake(self.size.width/2, self.size.height/2 + upArrow.size.width);
    [self addChild: upArrow];

    overlayBezierPath = UIBezierPath.bezierPath;
    [overlayBezierPath moveToPoint: bottomLeft];
    [overlayBezierPath addLineToPoint:centerRectCenterPoint];
    [overlayBezierPath addLineToPoint:bottomRight];
    [overlayBezierPath addLineToPoint: bottomLeft];

    overlayShape = [SKShapeNode node];
    overlayShape.path = overlayBezierPath.CGPath;
    overlayShape.strokeColor = [UIColor clearColor];
    overlayShape.antialiased = NO;
    overlayShape.name = @"up";
    overlayShape.zPosition = 1;
    [self addChild:overlayShape];
    [buttons addObject: overlayShape];

    // right arrow
    rightArrow = [SKSpriteNode spriteNodeWithImageNamed:@"pad-right-arrow"];
    rightArrow.zPosition = -1;
    rightArrow.alpha = .6;
    [rightArrow setScale: scale];
    rightArrow.position = CGPointMake(self.size.width/2 + upArrow.size.width + xButtonMargin, self.size.height/2);
    [self addChild: rightArrow];
    
    overlayBezierPath = UIBezierPath.bezierPath;
    [overlayBezierPath moveToPoint: topRight];
    [overlayBezierPath addLineToPoint:centerRectCenterPoint];
    [overlayBezierPath addLineToPoint:bottomRight];
    [overlayBezierPath addLineToPoint:CGPointMake(self.size.width, bottomRight.y)];
    [overlayBezierPath addLineToPoint:CGPointMake(self.size.width, 0)];
    [overlayBezierPath moveToPoint: topRight];

    overlayShape = [SKShapeNode node];
    overlayShape.path = overlayBezierPath.CGPath;
    overlayShape.strokeColor = [UIColor clearColor];
    overlayShape.antialiased = NO;
    overlayShape.name = @"right";
    overlayShape.zPosition = 1;
    [self addChild:overlayShape];
    [buttons addObject: overlayShape];
    
    // down arrow
    downArrow = [SKSpriteNode spriteNodeWithImageNamed:@"pad-down-arrow"];
    [downArrow setScale: scale];
    downArrow.name = @"down";
    downArrow.alpha = .6;
    downArrow.position = CGPointMake(self.size.width/2, self.size.height/2 - downArrow.size.width);
    [self addChild: downArrow];
  
    overlayBezierPath = UIBezierPath.bezierPath;
    [overlayBezierPath moveToPoint: topLeft];
    [overlayBezierPath addLineToPoint:centerRectCenterPoint];
    [overlayBezierPath addLineToPoint:topRight];
    [overlayBezierPath addLineToPoint: topLeft];
    
    overlayShape = [SKShapeNode node];
    overlayShape.path = overlayBezierPath.CGPath;
    overlayShape.strokeColor = [UIColor clearColor];
    overlayShape.antialiased = NO;
    overlayShape.name = @"down";
    overlayShape.zPosition = 1;
    [self addChild:overlayShape];
    [buttons addObject: overlayShape];
    
    // left arrow
    leftArrow = [SKSpriteNode spriteNodeWithImageNamed:@"pad-left-arrow"];
    [leftArrow setScale: scale];
    leftArrow.alpha = .6;
    leftArrow.name = @"left";
    leftArrow.position = CGPointMake(self.size.width/2 - upArrow.size.width - xButtonMargin, self.size.height/2 );
    [self addChild: leftArrow];

    overlayBezierPath = UIBezierPath.bezierPath;
    [overlayBezierPath moveToPoint: topLeft];
    [overlayBezierPath addLineToPoint:centerRectCenterPoint];
    [overlayBezierPath addLineToPoint:bottomLeft];
    [overlayBezierPath addLineToPoint:CGPointMake(0, bottomLeft.y)];
    [overlayBezierPath addLineToPoint:CGPointMake(0, 0)];
    [overlayBezierPath moveToPoint: topLeft];
    
    overlayShape = [SKShapeNode node];
    overlayShape.path = overlayBezierPath.CGPath;
    overlayShape.strokeColor = [UIColor clearColor];
    overlayShape.antialiased = NO;
    overlayShape.name = @"left";
    overlayShape.zPosition = 1;
    [self addChild:overlayShape];
    [buttons addObject: overlayShape];
}
@end