Test Driven Cocos2d

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

Saturday, October 26, 13

[Expect(game)
toBe:Fun]
TDD in Games with Cocos2D


Sprites and Sprite Sheets
Scene Management
Actions and Animations
Effects
Menus
Tile Maps
And more....


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


Hello World Layer
+(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
// 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];


Buckets
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


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]];
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]];
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];
}


Bomber Spec
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];
});


Rigged Locations
@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;
}
@end


Random 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];
});


Bomber Spec
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
[bomber start];
});
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
});


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];
}
}


“Random”
-(id) init
{
if (self = [super init])
{
srand48(time(0));
}
return self;
}
-(float) generate
{
return drand48();
}


Bombing Layer
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];


Bomber Sprite
@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 Spec
It(@"drops a bomb when it changes direction", ^{
RiggedLocations *locations = [RiggedLocations
newWithValues:@[@18.0]];
initWithPosition:CGPointMake(17.0,
speed:1.0
[bomber start];
[ExpectInt(bomber.bombCount) toBe:1];
});


Bomber Spec
It(@"moves the bomb on each update", ^{
RiggedLocations *locations = [RiggedLocations
newWithValues:@[@18.0]];
initWithPosition:CGPointMake(17.0
speed:1.0
locationChooser:locations
height:10
bombHeight:20];
[bomber start];
CGPoint bombPosition;
[(NSValue *) bomber.bombs[0] getValue:&bombPosition];
[ExpectInt(bombPosition.x) toBe:18];
[ExpectInt(bombPosition.y) toBe:55 - kGravity];
});


Bomber Sprite
[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];
}];


SHOW ME


TDD and Games
• Have a Plan
• You Use the Framework
• Keep Views dumb
Bullets Suck - Hi Eric


@paytonrules
www.paytonrules.com
www.8thlight.com
www.github.com/paytonrules


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