While I follow a tutorial on how to create a game using a sprite kit, I created a physics body for scene like this:
#implementation GameScene
-(void)didMoveToView:(SKView *)view {
/* Setup your scene here */
self.backgroundColor = [SKColor whiteColor];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsWorld.gravity = CGVectorMake(0,5);
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"nn_03"];
ball.position= CGPointMake(self.size.width/2, self.size.height/2);
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.frame.size.height/2];
[self addChild:ball];
And when I checked it, it work just with upper and lower bounded of the scene and doesn't work with left and right side of the scene ? Where is the problem ?
And my second question when i downgrade my Xcode 6 to Xcode 5 , can i target iOS 8 IN XCODE 5 OR NOT ?
Related
I was using Objective-C and SpriteKit. I made a SKSpriteNode of a simple ball, then added it. Unfortunately, it's not showing up.
-(void)didMoveToView:(SKView *)view {
/* Setup your scene here */
// Set background color
self.backgroundColor = [SKColor whiteColor];
// Creating a new spritenode from an image
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed: #"ball"];
// Add the sprite node to the scene
[self addChild: ball];
Did you forget to set the sprite's position?
ball.position = CGPointMake(CGRectGetMidX(self.scene.frame), CGRectGetMidY(self.scene.frame));
I am very fresher to game development and I need to develop a game like NinjaJump.
I have created a CCParallaxNode to setup scrolling background and added CCPhysicsNode to setup Physics world. I have created player object as shown below.
// Add a sprite
_sprite = [CCSprite spriteWithImageNamed:#"Icon.png"];
_sprite.position = ccp(self.contentSize.width/2,100);
_sprite.physicsBody = [CCPhysicsBody bodyWithRect:(CGRect){CGPointZero, _sprite.contentSize} cornerRadius:0.0];
_sprite.physicsBody.friction = 0.0f;
_sprite.physicsBody.collisionGroup = #"player";
_sprite.physicsBody.collisionType = #"Player";
//_sprite.physicsBody.collisionMask = 0;
//[self addChild:_sprite];
[foreground addChild:_sprite];
foreground is just a node added into CCScene to easily manage player in-focus.
// code for physics world
_physicsWorld = [CCPhysicsNode node];
_physicsWorld.gravity = ccp(0,-100);
_physicsWorld.debugDraw = YES;
//_physicsWorld.collisionDelegate = self;
[self addChild:_physicsWorld];
_foreground = [CCNode node];
//[self addChild: _foreground];
[_physicsWorld addChild: _foreground];
To make player always visible we have implemented update method as
- (void) update:(CFTimeInterval)currentTime {
// Calculate player y offset
if (_player.position.y > 200.0f) {
//_midgroundNode.position = CGPointMake(0.0f, -((_player.position.y - 200.0f)/4));
_foreground.position = CGPointMake(0.0f, -(_player.position.y - 200.0f));
}
}
I can't understand but the player scrolls off screen anyhow. The code is written in Cocos2d v3.
I have also setup a demo project to show what I implemented: https://www.dropbox.com/s/5s55d00kk80wun4/HumptyJump-Example.zip?dl=0
Any kind of help is appreciated. Thanks in advance.
I could not run your sample code but one thing, I can tell you for sure that there is no need of Physics Engine here.
You just keep your player at a particular height and just move your object right to left.
Apply moving parallax background image and objects to give a feel that your character is moving upwards or downwards.
For reference you can see the games like Swing Drop, made on the same approach as above.
I have implemented 2 fixed views changing their positions while physics body goes down ;).
See the same in action
#interface TestScene () {
CCNode *_background;
CCNode *_foreground;
NSArray *grounds; // Keeps track of each of the 2 views
CCPhysicsNode *_physicsWorld;
}
#implementation TestScene
- (id)init {
self = [super init];
if (!self) return(nil);
// Enable touch handling on scene node
self.userInteractionEnabled = YES;
// Physics world setup
_physicsWorld = [CCPhysicsNode node];
_physicsWorld.gravity = ccp(0,-100);
_physicsWorld.debugDraw = YES;
_physicsWorld.collisionDelegate = self;
[self addChild:_physicsWorld];
// Foreground node in which platforms are there and moves downwards as player goes up
_foreground = [CCNode node];
// Adding background images
CCSprite *default1 = [CCSprite spriteWithImageNamed: #"Default.png"];
[default1 setAnchorPoint: ccp(0, 0)];
CCSprite *default2 = [CCSprite spriteWithImageNamed: #"Default.png"];
[default2 setAnchorPoint: ccp(0, 0)];
[default2 setPosition: ccp(0, default1.contentSize.height)];
[_foreground addChild: default1];
[_foreground addChild: default2];
// Adding into array
grounds = #[default1, default2];
// Adding into physics world
[_physicsWorld addChild: _foreground];
// creating player
_player = [CCSprite spriteWithImageNamed: #"Assets.atlas/Player.png"];
[_player setPosition: ccp(160.0f, 160.0f)];
_player.physicsBody = [CCPhysicsBody bodyWithRect:(CGRect){CGPointZero, _player.contentSize} cornerRadius:0]; // 1
_player.physicsBody.collisionGroup = #"playerGroup"; // 2
_player.physicsBody.collisionType = #"player";
//[_physicsWorld addChild:_player];
[_foreground addChild: _player];
// Multiple platforms can be added into body, they are static entities only
PlatformNode *platform = (PlatformNode *)[PlatformNode node];
[platform createPlatformAtPosition:CGPointMake(110, 50) ofType: PLATFORM_NORMAL];
[_foreground addChild: platform];
return self;
}
- (void) update:(CFTimeInterval)currentTime {
// Take background and physics world down, 163 was Y position of the player
_physicsWorld.position = ccp(_physicsWorld.position.x, 163 - _player.position.y);
// loop the ground
for (CCNode *ground in grounds) {
// Get the world position
CGPoint groundWorldPosition = [_physicsWorld convertToWorldSpace: ground.position];
// Get screen position
CGPoint groundScreenPosition = [self convertToNodeSpace: groundWorldPosition];
NSLog(#"Positioning ground ---> world: (%f, %f) & screen: (%f, %f)", groundWorldPosition.x, groundWorldPosition.y, groundScreenPosition.x, groundScreenPosition.y, nil);
if (groundScreenPosition.y <= -ground.contentSize.height) {
ground.position = ccp(ground.position.x, ground.position.y + 2 * ground.contentSize.height);
break;
}
}
}
-(void) touchBegan:(UITouch *)touch withEvent:(UIEvent *)event {
// Take the player upside
[_player.physicsBody applyImpulse: ccp(0, 215)];
}
#end
This is how I coded the background :).
I'm trying to make a physics mechanic where a vertically standing object can be hit or knocked down and then will pivot back up to it's origin position. Think of it like a floor mounted punch bag. So the object will have a low pivot/anchor point.
I just wanted a little theoretical direction in how to approach this using SpriteKit physics.
Any help would be really appreciated.
Thanks
The following creates a composite object by joining two bodies: a circle and a weight. The weight is offset relative to the center of the circle and is much denser. When added to the scene, gravity rotates the combined object so the side with the weight is on the bottom. To use it 1) create a new sprite kit game, 2) replace the default initWithSize and touchesBegan methods with this code, and 3) run and click at various locations in the scene.
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
}
return self;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
SKShapeNode *circle = [SKShapeNode node];
circle.path =[UIBezierPath bezierPathWithOvalInRect: CGRectMake(-32, -32, 64, 64)].CGPath;
circle.position = location;
circle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:32];
SKSpriteNode *weight = [SKSpriteNode spriteNodeWithColor:[UIColor whiteColor] size:CGSizeMake(8, 8)];
// Adjust this to get the desire effect
weight.position = CGPointMake(location.x+1, location.y+28);
weight.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:4];
// Adjust this to get the desired effect
weight.physicsBody.density = 100.0;
// The physics bodies must be in the scene before adding the joint
[self addChild:circle];
[self addChild:weight];
// Join the circle and the weight with a physics joint
SKPhysicsJoint *joint = [SKPhysicsJointFixed jointWithBodyA:circle.physicsBody bodyB:weight.physicsBody anchor:weight.position];
[self.physicsWorld addJoint:joint];
}
}
I am a beginner developing a program for the AppStore using Xcode's sprite kit. I made a 'test' program so I can try out new things before adding it to my game. Right now I am fiddling around with swiping a scene - I have an SKNode (called "background") where I am adding several children as SKSpriteNodes. One sprite node is visible on the initial scene (the center, position 160,240), and two more that are not visible: to the left of the scene (position -160,240), and to the right of the scene (position 480,240).
I would like my game to be able to swipe left or right, and when it swipes left or right, the view will auto-center itself (with animation) to one of the three SKSpriteNodes. My code using the UIPanGestureRecognizer to move the background node works properly, and my code for auto-centering the view works MOSTLY (background position set to 0,0 or -320,0 or +320,0), but sometimes it has a strange offset and doesn't completely center itself (for example, the background position will be 7,0 or -34,0 when I pan right or left). What am I doing wrong?
P.S: I am using code from RayWenderlich's "iOS Games" for the SKTMoveEffect. I also want to note that if I make the function f(t)=t, there is no problem (at least in my several tests), but f(t)=t^2 or anything else seems to have an issue; if it helps to see the code for this I can post it too
#implementation LTMyScene
{
SKNode *background;
SKSpriteNode *spaceship1, *spaceship2;
}
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
background=[SKNode node];
[self addChild:background];
self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
SKLabelNode *myLabel = [SKLabelNode labelNodeWithFontNamed:#"Chalkduster"];
myLabel.text = #"Hello, World!";
myLabel.fontSize = 30;
myLabel.position = CGPointMake(CGRectGetMidX(self.frame),
CGRectGetMidY(self.frame));
[background addChild:myLabel];
spaceship1=[SKSpriteNode spriteNodeWithImageNamed:#"Spaceship.png"];
spaceship1.position=CGPointMake(-self.size.width/2, self.size.height/2);
spaceship1.anchorPoint=CGPointMake(0.5, 0.5);
[background addChild:spaceship1];
spaceship2=[SKSpriteNode spriteNodeWithImageNamed:#"Spaceship.png"];
spaceship2.position=CGPointMake(self.size.width*3/2, self.size.height/2);
spaceship2.anchorPoint=CGPointMake(0.5, 0.5);
[background addChild:spaceship2];
}
return self;
}
- (void)didMoveToView:(SKView *)view
{
UIPanGestureRecognizer *swipe = [[UIPanGestureRecognizer alloc] initWithTarget:self action:#selector(dragPlayer:)];
[[self view] addGestureRecognizer:swipe];
}
-(void)dragPlayer: (UIPanGestureRecognizer *)gesture {
[[[self view] layer] removeAllAnimations];
CGPoint trans = [gesture translationInView:self.view];
SKAction *moveAction = [SKAction moveByX:trans.x y:0 duration:0];
[background runAction:moveAction];
[gesture setTranslation:CGPointMake(0, 0) inView:self.view];
if([gesture state] == UIGestureRecognizerStateEnded) {
CGFloat finalX=0;
if (abs(background.position.x)<self.size.width/2) {
finalX=0;
} else if (abs(background.position.x)<self.size.width*3/2) {
finalX=self.size.width*background.position.x/abs(background.position.x);
}
NSLog(#"%f",finalX);
SKTMoveEffect *upEffect =
[SKTMoveEffect effectWithNode:background duration:0.5
startPosition:background.position
endPosition:CGPointMake(finalX, 0)];
upEffect.timingFunction = ^(float t) {
// return powf(2.0f, -3.0f * t) * fabsf(cosf(t * M_PI * 1.0f)) //has bounce
// return (-1.0f*t*t+1) //no bounce ... for parabola this is only solution with (1,0) and (0,1) as intercepts and vertex at (1,0)
return (t*t)
;};
SKAction *upAction = [SKAction actionWithEffect:upEffect];
[background runAction:upAction];
}
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
NSLog(#"%f,%f",background.position.x,background.position.y);
}
#end
You have to remember that you are moving the larger background node with other nodes as its children. Keeping that in mind, the code you need to center on a specific node is:
_worldNode.position = CGPointMake(-(myNode.position.x-(self.size.width/2)), -(myNode.position.y-(self.size.height/2)));
The above assumes that your main background "canvas" is called _worldNode and your target node is a child of _worldNode
I am just beginning programming games in Xcode 5 using cocos2D and found this pretty strange. I'm starting out fresh on a menu scene and was importing a background and a button. The following code positions my background just fine sometimes, but then other times it's adjusted upwards about 50 pixels (my simulator is on it's side, or it's length is lying horizontal, so technically it's shifting about -50 pixels in the "width" direction, although to the simulator it shifts upwards).
Note I found that every time I run my program, it alternates between being properly aligned and shifted. Why would this be happening ugh! Below is the code I'm using.
Note 2 I'm using Kobold2D and the framework I'm using has a config.lua that's a little beyond my scope for me to understand everything. The config.lua code is located here http://snipt.org/BEt6
-(id) init
{
if ((self = [super init]))
{
CCSprite *sprite = [CCSprite spriteWithFile:#"background.png"];
sprite.anchorPoint = CGPointZero;
[self addChild:sprite z:-1];
sprite = [CCSprite spriteWithFile:#"button.png"];
sprite.anchorPoint = CGPointZero;
sprite.position = CGPointMake(200,200);
[self addChild:sprite z:0];
}
return self;
}
The only problem with your code is that you are initializing sprite twice, which is NOT very good.
I would think it is causing your problem.
Try this code:
-(id) init
{
if ((self = [super init]))
{
CCSprite *sprite = [CCSprite spriteWithFile:#"background.png"];
sprite.anchorPoint = CGPointZero;
[self addChild:sprite z:-1];
CCSprite *sprite2 = [CCSprite spriteWithFile:#"button.png"];
sprite2.anchorPoint = CGPointZero;
sprite2.position = CGPointMake(200,200);
[self addChild:sprite2 z:0];
}
return self;
}