Test Driven Cocos2d

Saturday, October 26, 13

A game is a system in which players engage in an artificial conflict, defined by rules, that results in a quantifiable outcome.

Rules of Play

[Expect(game) toBe:Fun]

TDD in Games with Cocos2D

Sprites and Sprite SheetsScene ManagementActions and AnimationsEffectsMenusTile MapsAnd more....

The player starts the game and has three buckets. They can move the buckets right and left.

+(CCScene *) scene{!// 'scene' is an autorelease object.!CCScene *scene = [CCScene node];!!// 'layer' is an autorelease object.!HelloWorldLayer *layer = [HelloWorldLayer node];!!// add layer as a child to scene![scene addChild: layer];!!// return the scene!return scene;}

Hello World Layer

Hello World Layer// on "init" you need to initialize your instance-(id) init{!// always call "super" init!// Apple recommends to re-assign "self" with the "super's" return value!if( (self=[super init]) ) {!!!! // create and initialize a Label!! CCLabelTTF *label = [CCLabelTTF labelWithString:@"Hello World"

fontName:@"Marker Felt" fontSize:64];

!! // ask director for the window size!! CGSize size = [[CCDirector sharedDirector] winSize];!!! // position the label on the center of the screen!! label.position = ccp( size.width /2 , size.height/2 );!!!! // add the label as a child to this Layer!! [self addChild: label];

OCDSpec2Context(BucketsSpec) { Describe(@"moving", ^{ It(@"moves to the right", ^{ Buckets *buckets = [[Buckets alloc] initWithPosition:CGPointMake(10.0, 10.0)];

[buckets move:1];

[ExpectFloat(buckets.position.x) toBe:11.0 withPrecision:0.00001]; });

It(@"moves to the left", ^{ Buckets *buckets = [[Buckets alloc] initWithPosition:CGPointMake(10.0, 10.0)];

[buckets move:-1.0];

[ExpectFloat(buckets.position.x) toBe:9.0 withPrecision:0.00001]; }); }); }

Buckets

@implementation Buckets

-(id) initWithPosition:(CGPoint) position{ if (self = [super init]) { self.position = position; } return self;}

-(void) move:(float) movement{ self.position = CGPointMake(self.position.x + movement, self.position.y);}@end

Buckets

Bombing Layer

-(id) init{ if( (self=[super init]) ) {!! // ask director for the window size!! CGSize size = [[CCDirector sharedDirector] winSize];

Buckets *buckets = [[Buckets alloc] initWithPosition:CGPointMake(size.width / 2, size.height / 2)]; BucketsSprite *sprite = [BucketsSprite spriteWithBuckets:buckets];

!! // add the sprite as a child to this Layer!! [self addChild: sprite];!}!return self;}

Buckets Sprite@implementation BucketsSprite

+(id) spriteWithBuckets:(Buckets *)buckets{ BucketsSprite *sprite = [BucketsSprite spriteWithFile:@"buckets.png"]; sprite.buckets = buckets;

[sprite scheduleUpdate]; return sprite;}

-(void)update:(ccTime)delta { [self setPosition:self.buckets.position];}@end

Bombing Layer-(BOOL) ccTouchBegan:(UITouch *)touch withEvent:(UIEvent *)event{ CGPoint point = [touch locationInView:[touch view]]; CGSize size = [[CCDirector sharedDirector] winSize];

if (point.x > size.width / 2) { self.movement++; } else { self.movement--; } return YES;}

Bombing Layer

-(void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event{ CGPoint point = [touch locationInView:[touch view]]; CGSize size = [[CCDirector sharedDirector] winSize];

if (point.x > size.width / 2) { self.movement--; } else { self.movement++; }}

Bombing Layer

-(void)update:(ccTime)delta{ BucketsSprite *sprite = (BucketsSprite *)[self getChildByTag:kBucket]; [sprite move:self.movement];}

?Saturday, October 26, 13

OCDSpec2Context(BomberSpec) { Describe(@"moving back and forth", ^{ It(@"moves towards its next spot", ^{ RiggedLocations *locations = [RiggedLocations newWithValues:@[@0.0]]; Bomber *bomber = [[Bomber alloc] initWithPosition:CGPointMake(10, 40)

speed:1.0 locationChooser:locations];

[bomber start];

[bomber update:1.0];

[ExpectFloat(bomber.position.x) toBe:9.0 withPrecision:0.0001]; });

Bomber Spec

@implementation RiggedLocations

-(float) next { float value = [(NSNumber *) [self.values firstObject] floatValue]; if (self.values.count > 1) { [self.values removeObjectAtIndex:0]; }

return value;}

+(RiggedLocations *) newWithValues:(NSArray *)array { RiggedLocations *locations = [RiggedLocations new]; locations.values = [NSMutableArray arrayWithArray:array]; return locations;}

Rigged Locations

Describe(@"using the random number generator", ^{

It(@"uses the random number generator for its next location", ^{ id rand = [OCMockObject mockForProtocol:@protocol(RandomNumberGenerator)]; NSRange range = NSMakeRange(0, 100);

RandomLocationChooser *chooser = [RandomLocationChooser newChooserWithRange:range generator:rand];

float retVal = 0.0; [[[rand stub] andReturnValue:OCMOCK_VALUE(retVal)] generate];

[ExpectFloat([chooser next]) toBe:0.0 withPrecision:0.0001]; });

Random Locations

It(@"stops at the location when coming from the left", ^{ RiggedLocations *locations = [RiggedLocations newWithValues:@[@19.0, @22.0]]; Bomber *bomber = [[Bomber alloc] initWithPosition:CGPointMake(17, 40) speed:2.0 locationChooser:locations];

[bomber start];

[bomber update:1.0]; [bomber update:1.0];

It(@"doesn't move until it is started", ^{ RiggedLocations *locations = [RiggedLocations newWithValues:@[@19.0, @22.0]]; Bomber *bomber = [[Bomber alloc] initWithPosition:CGPointMake(17, 40) speed:2.0 locationChooser:locations];

[bomber update:1.0];

Bomber Spec

Bomber- (void)update:(float)deltaTime{ if (self.started) { float moveDistance = self.speed * deltaTime; float distanceRemaining = abs(self.location - self.position.x);

if (self.location > self.position.x) { self.position = CGPointMake(self.position.x + moveDistance, self.position.y); } else { self.position = CGPointMake(self.position.x - moveDistance, self.position.y); }

if (moveDistance >= distanceRemaining) { self.location = [self.locations next]; } }

-(id) init{ if (self = [super init]) { srand48(time(0)); } return self;}

-(float) generate{ return drand48();}

“Random”

Bomber *bomber = [[Bomber alloc] initWithPosition:CGPointMake(size.width / 2, speed:60.0 locationChooser:chooser];BomberSprite *bomberSprite = [BomberSprite newSpriteWithBomber:bomber];

[self addChild:bomberSprite z:0 tag:kBomber]; [bomber start];

Bombing Layer

@implementation BomberSprite

+(id) newSpriteWithBomber:(Bomber *)bomber{ BomberSprite *sprite = [BomberSprite spriteWithFile:@"bomber.png"]; sprite.bomber = bomber; [sprite scheduleUpdate]; return sprite;}

-(void)update:(ccTime)delta{ [self.bomber update:delta]; [self setPosition:self.bomber.position];}

Bomber Sprite

It(@"drops a bomb when it changes direction", ^{ RiggedLocations *locations = [RiggedLocations newWithValues:@[@18.0]]; Bomber *bomber = [[Bomber alloc] initWithPosition:CGPointMake(17.0, speed:1.0 locationChooser:locations];

[bomber start]; [bomber update:1.0];

[ExpectInt(bomber.bombCount) toBe:1]; });

Bomber Spec

It(@"moves the bomb on each update", ^{ RiggedLocations *locations = [RiggedLocations newWithValues:@[@18.0]];

Bomber *bomber = [[Bomber alloc] initWithPosition:CGPointMake(17.0 speed:1.0 locationChooser:locations height:10 bombHeight:20];

[bomber start]; [bomber update:1.0]; [bomber update:1.0];

CGPoint bombPosition; [(NSValue *) bomber.bombs[0] getValue:&bombPosition]; [ExpectInt(bombPosition.x) toBe:18]; [ExpectInt(bombPosition.y) toBe:55 - kGravity]; });

Bomber Spec

[self.bomber.bombs enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) { [self.parent removeChildByTag:kBomb + idx]; NSValue *bombValue = (NSValue *)obj; CGPoint location; [bombValue getValue:&location];

CCSprite *bombSprite = [CCSprite spriteWithFile:@"bomb.png"]; bombSprite.position = location; [self.parent addChild:bombSprite z:0 tag:kBomb + idx]; }];

Bomber Sprite

SHOW ME

TDD and Games

• Have a Plan

• You Use the Framework

• Keep Views dumbBullets Suck - Hi Eric

@paytonruleswww.paytonrules.comwww.8thlight.comwww.github.com/paytonrules

Test Driven Cocos2d

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