I'm trying to detect contact between my mover sprite and the bottom. I've created an category for the bottom sprite called worldCategory and after that i'm detecting collision using didBeginContact method. At the moment i do not get any kind of notification on the contact.
First i define the category using bitmasks:
Then i create the bottom SKSpriteNode and creates the physicsbody andcategory and contaact bitmasks:
static const uint32_t worldCategory = 1 << 1;
bottom = [SKSpriteNode spriteNodeWithColor:[SKColor clearColor] size:CGSizeMake(self.frame.size.width*2, 120)];
bottom.position = CGPointMake(0, 0);
[self addChild:bottom];
bottom.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:bottom.frame];
bottom.physicsBody.categoryBitMask = worldCategory;
mover.physicsBody.contactTestBitMask = worldCategory;
didBeginContact method:
-(void)didBeginContact:(SKPhysicsContact *)contact {
SKSpriteNode *firstNode, *secondNode;
firstNode = (SKSpriteNode *)contact.bodyA.node;
secondNode = (SKSpriteNode *) contact.bodyB.node;
int bodyAA = contact.bodyA.categoryBitMask;
if (bodyAA == worldCategory) {
NSLog(#"Contact");
SKTransition *reveal = [SKTransition doorsCloseVerticalWithDuration:1.0 ];
EndScene *newScene = [[EndScene alloc] initWithSize: CGSizeMake(self.size.width,self.size.height)];
// Optionally, insert code to configure the new scene.
[self.scene.view presentScene: newScene transition: reveal];
}
}
Edge-based bodies do not generate contact events. Since you create rectangles you should use a polygon body instead.
Related
I have two body
SKShapeNode *hero = [SKShapeNode shapeNodeWithCircleOfRadius:HERO_SIZE];
hero.lineWidth = 1;
hero.fillColor = [SKColor orangeColor];
hero.name = #"Hero";
hero.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:HERO_SIZE];
hero.physicsBody.categoryBitMask = hero;
hero.physicsBody.collisionBitMask = friendlyCategory | enemyCategory;
hero.physicsBody.contactTestBitMask = friendlyCategory | enemyCategory;
hero.position = [self getStartPosition];
SKShapeNode *circle = [SKShapeNode shapeNodeWithCircleOfRadius:BALL_SIZE];
circle.position = [self randomPossition];
circle.lineWidth = 2;
circle.strokeColor = [SKColor blueColor];
circle.fillColor = color;
circle.name = #"Circle";
circle.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:BALL_SIZE];
circle.physicsBody.categoryBitMask = friendlyCategory;
circle.physicsBody.collisionBitMask = hero;
circle.physicsBody.contactTestBitMask = hero;
then,
- (void)didEndContact:(SKPhysicsContact *)contact
{
uint32_t collision = (contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask);
if (collision == (friendlyCategory | hero ))
{
SKShapeNode* node = (SKShapeNode*)contact.bodyA.node;
if ([node.name isEqualToString:#"Hero"])
{
self.activeFriendlyBall = (SKShapeNode*)contact.bodyB.node;
}
else
{
self.activeFriendlyBall = (SKShapeNode*)contact.bodyA.node;
}
self.hero.position = self.activeFriendlyBall.position;
}
}
Hero must be added above activeFriendlyBall, for him center position. But it added near him. I think it because physic body added. But I need to use physic body for other logic.
http://cl.ly/image/0g1S0d3h1h0w
must be like, how in top screen.
I find solution.
self.heroBall.physicsBody.velocity = CGVectorMake(0, 0);
[self.heroBall runAction: [SKAction moveTo:self.activeFriendlyBall.position duration:0.0]];
I believe it is because you have collision detection enabled for both, which means they can't be put on top of one another. If you are just trying to determine if one sprite comes into contact with another all you need is the contact detection. Removing either hero or friendlyball from the collision detection bit mask will allow them to be placed on top of each other/go through each other etc.
If you don't care about collisions at all for one of them (the sprite doesn't 'bounce' off anything) I'd recommend just setting collision detection to 0 for that sprite.
Best
as the title suggest, i have issue with creating contact between my enemies sprite and the hero laser(bullet). i create my enemies trough the following method and am adding them to the view.
-(void)Enemies{
//not always come
int GoOrNot = [self getRandomNumberBetween:0 to:1];
if(GoOrNot == 1){
SKSpriteNode *enemy;
int randomEnemy = [self getRandomNumberBetween:0 to:1];
if(randomEnemy == 0)
enemy = [SKSpriteNode spriteNodeWithImageNamed:#"enemy_spaceship.png"];
else
enemy = [SKSpriteNode spriteNodeWithImageNamed:#"Spaceship15.png"];
enemy.scale = 0.4;
enemy.position = CGPointMake(450, 0);
enemy.hidden = NO;
CGPoint location = CGPointMake(450, 320);
SKAction *moveAction = [SKAction moveTo:location duration:2.5];
SKAction *doneAction = [SKAction runBlock:(dispatch_block_t)^() {
//NSLog(#"Animation Completed");
enemy.hidden = YES;
}];
SKAction *moveAsteroidActionWithDone = [SKAction sequence:#[moveAction,doneAction ]];
[enemy runAction:moveAsteroidActionWithDone withKey:#"asteroidMoving"];
[self addChild:enemy];
_enemyBullets = [[NSMutableArray alloc] initWithCapacity:kNumEnemyBullet];
for (int i = 0; i < kNumEnemyBullet; ++i) {
SKSpriteNode *enemyBullets = [SKSpriteNode spriteNodeWithImageNamed:#"rocket"];
enemyBullets.hidden = YES;
[enemyBullets setXScale:0.5];
[enemyBullets setYScale:0.5];
[_enemyBullets addObject:enemyBullets];
[enemy addChild:enemyBullets];
}
}
}
then i add the bullets through a mutable array and then adding my bullets to the enemies sprites as their child. that part works. i can create contact between hero and the enemy bullet and it gets detected. what i have issue with is that my hero's laser does not create contact with the enemy thus i can't make the enemy take hit from the laser. i tries adding the physics body to the method i am using but throws all the other sprites into hell and they don't respond properly anymore.
the following code is my collision code which i am using in update method:
for (SKSpriteNode *enemyBullets in _enemyBullets) {
if (enemyBullets.hidden) {
continue;
}
if ([_ship intersectsNode:enemyBullets]) {
enemyBullets.hidden = YES;
SKAction *blink = [SKAction sequence:#[[SKAction fadeOutWithDuration:0.1],
[SKAction fadeInWithDuration:0.1]]];
SKAction *blinkForTime = [SKAction repeatAction:blink count:4];
SKAction *shipExplosionSound = [SKAction playSoundFileNamed:#"explosion_large.caf" waitForCompletion:NO];
[_ship runAction:[SKAction sequence:#[shipExplosionSound,blinkForTime]]];
_lives--;
_livesLabel.text = [NSString stringWithFormat:#"%d Lives", _lives];
NSLog(#"your ship has been hit!");
}
}
is there any way that i can use to create a physics body for my enemies so i can create the contact between the hero laser and the enemies sprite with the same structure i have currently ? any help is amazingly appreciated.
You most certainly can create a physics body for your enemies. Right after this code enemy = [SKSpriteNode spriteNodeWithImageNamed:#"enemy_spaceship.png"]; you can add a physics body like this:
enemy.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.size];
enemy.physicsBody.categoryBitMask = CategoryEnemy; // or whatever you need
enemy.physicsBody.collisionBitMask = CategoryRock; // or whatever you need
enemy.physicsBody.contactTestBitMask = CategoryBullet // or whatever you need
enemy.physicsBody.dynamic = NO; // or YES
enemy.physicsBody.allowsRotation = NO; // or YES
enemy.physicsBody.restitution = 0; // or another value between 0 to 1
enemy.physicsBody.friction = 0.0; // or another value between 0 to 1
There are many ways to create a physics body. You can do a rectangle shape, circle shape, outline a texture or draw your own.
You should read the Apple docs on this subject to get a better understanding of what you can do and what properties are available.
SO following an IOS game tutorial, its IO7 as not many for 8 are out yet.
The following code is supposed to be a ball bouncing around but only bounces on the top and bottom of the screen, if it hits the side edges the ball goes of screen
#import "GameScene.h"
#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, 0);
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball"];
ball.position = CGPointMake(CGRectGetMidX(self.frame),CGRectGetMidY(self.frame));
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.frame.size.width/2];
//ball.physicsBody.friction = 0;
ball.physicsBody.linearDamping = 0;
ball.physicsBody.restitution = 1;
[self addChild:ball];
CGVector myVector = CGVectorMake(0, 5);
[ball.physicsBody applyImpulse:myVector];
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
}
#end
There has to be something simple here but i can't seem to find an answer on stack overflow
Use NSLog to check the size of your view: NSLog(#"%f,%f",self.size.width,self.size.height);
There is a problem with SpriteKit that causes the view dimensions to be off of what you expect. If this is what is happening in your case, then make sure to change the size of your view to the correct one:
-(void)didMoveToView:(SKView *)view {
/* Setup your scene here */
self.size = self.view.frame.size;
self.backgroundColor =[SKColor whiteColor];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsWorld.gravity = CGVectorMake(0, 0);
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball"];
ball.position = CGPointMake(CGRectGetMidX(self.frame),CGRectGetMidY(self.frame));
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.frame.size.width/2];
//ball.physicsBody.friction = 0;
ball.physicsBody.linearDamping = 0;
ball.physicsBody.restitution = 1;
[self addChild:ball];
CGVector myVector = CGVectorMake(50, 20);
[ball.physicsBody applyImpulse:myVector];
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
}
Hi.
I'm having this weird problem in Sprite Kit. I'm using nodeAtPoint and categoryBitMask to detect whether the player is touching the ground when calling a jump method.
Everything's working as it should. But then — in order to reveal some optional buttons in a drawer — when I move the parent node with SKAction moveTo:CGPoint (I have both the ground and player as children of an SKNode), the player don't jump. I NSLog the pointBelowPlayer, and it is the same as before, but the blockNode.physicsBody is null! Might this be a bug in Sprite Kit, or am I missing something basic about inheritance and position?
The method for jumping:
-(void)playerJump {
// Player jump if on ground
CGPoint pointBelowPlayer = CGPointMake(_player.position.x, _player.position.y-_player.size.height);
SKNode *blockNode = [self nodeAtPoint:pointBelowPlayer];
if (blockNode.physicsBody.categoryBitMask == groundCategory){
[_player.physicsBody applyImpulse:CGVectorMake(0, 120.0f)];
}
}
The method for moving the parent node:
-(void)toggleDrawer {
if (bDrawerVisible) {
[_actionLayer runAction:[SKAction moveTo:CGPointMake(0, 0) duration:1]];
bDrawerVisible = false;
} else {
[_actionLayer runAction:[SKAction moveTo:CGPointMake(0, 200) duration:1]];
bDrawerVisible = true;
}
}
Creation of the SpriteNodes:
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
_actionLayer = [SKNode new];
_player = [self createPlayer];
[_actionLayer addChild:_player];
_ground = [self createGround];
[_actionLayer addChild:_ground];
}
-(SKSpriteNode *)createPlayer {
SKSpriteNode *player = [SKSpriteNode spriteNodeWithImageNamed:#"redSquare.png"];
player.name = #"player";
player.scale = 0.5;
player.position = CGPointMake(screenWidth/3, player.size.height*2);
player.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:player.size];
player.physicsBody.categoryBitMask = playerCategory;
player.physicsBody.collisionBitMask = groundCategory;
player.physicsBody.contactTestBitMask = noteCategory;
return player;
}
-(SKSpriteNode *)createGround {
SKSpriteNode *ground = [SKSpriteNode spriteNodeWithImageNamed:#"ground.png"];
ground.name = #"ground";
ground.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:ground.size];
ground.physicsBody.dynamic = NO;
ground.physicsBody.categoryBitMask = groundCategory;
ground.physicsBody.collisionBitMask = playerCategory;
ground.xScale = screenWidth/ground.size.width;;
ground.position = CGPointMake(self.size.width/2, 0);
return ground;
}
Ok i solve the problem...
if you have more then one Node, on the position you tap, you will get null if the deepest node have no name, or the name of the deepest Node.
So use this to go through all nodes are found:
UITouch *touch = [touches anyObject];
CGPoint location = [touch locationInNode:self];
NSArray *buttonNodes = [self nodesAtPoint:location];
for (SKNode *node in buttonNodes)
{
NSLog(#"%#", node.name);
}
Additional you can use NSLog(#"%f", node.zPosition); to get the zPosition to see witch one is on top.
Node at point might be another node (maybe your background?).
Use node.name to name the nodes and you may check if node if the same by comparing names with equalToString: method.
I'm trying to detect collisions between two sprites but I'm unable to do this with a child sprite.
self.player = [[Player alloc] initWithImageNamed:#"player"];
self.player.position = CGPointMake(150, 75);
[self addChild:self.player];
_object = [SKSpriteNode spriteNodeWithImageNamed:#"object"];
_object.position = CGPointMake(-40, 27);
[self.player addChild:_object];
then I have collision detetion like this
- (void)checkCollisions {
[self.map enumerateChildNodesWithName:#"enemy"
usingBlock:^(SKNode *node, BOOL *stop){SKSpriteNode *enemy = (SKSpriteNode *)node;
if (CGRectIntersectsRect(enemy.frame, _object.frame)) {
[enemy removeFromParent];
}
}]; }
*This does not work!!! but if I use :
CGRectIntersectsRect(enemy.frame, self.player.frame)
I can detect a collision with the main body. how do I do collision detection for a child of another sprite?
The child node's position and frame property are relative to it's parent, which you need to account for in your code.
SKNode has two methods that can help you with converting the position of a given SKNode to/from the coordinate spaces of another node:
convertPoint:fromNode:
convertPoint:toNode:
You can use those to convert a SKNode's position property to another coordinate space. What you want to do is convert the _object's position to the coordinate space of the enemy or visa versa and then use a temporary CGRect with that new position for your CGRectIntersectsRect check.
Here's an example :
CGPoint globalPosition = [self.player convertPoint:_object.position toNode:self.player.parent];
CGRect tempRect = CGRectMake(globalPosition.x, globalPosition.y, _object.frame.size.width, _object.frame.size.height);
if (CGRectIntersectsRect(enemy.frame, _object.frame))
{
// collision occurred
}
This code is assuming that your enemy and your player are in the same coordinate space. (have the same parent)
This happens because _object is a child node for self.player, and enemy node is a child node for self.map node. Both nodes should have same parent if you want to compare their frames.
I suggest you to use Sprite Kit's built-in collision handling mechanism:
// Object:
_object = [SKSpriteNode spriteNodeWithImageNamed:#"object"];
_object.position = CGPointMake(-40, 27);
_object.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:_object.frame.size;
_object.physicsBody.categoryBitMask = OBJECT_CATEGORY;
_object.physicsBody.contactTestBitMask = ENEMY_CATEGORY;
_object.physicsBody.collisionBitMask = 0;
[self.player addChild:_object];
// Enemy:
// init enemy: SKSpriteNode *enemy = [SKSpriteNode spriteNodeWithImageNamed:#"enemy"];
enemy.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:enemy.frame.size;
enemy.physicsBody.categoryBitMask = ENEMY_CATEGORY;
enemy.physicsBody.contactTestBitMask = OBJECT_CATEGORY;
enemy.physicsBody.collisionBitMask = 0;
// add enemy to the scene: [self addChild:enemy];
// Define that your SKScene conforms to SKPhysicsContactDelegate protocol:
.....
#interface MyScene : SKScene <SKPhysicsContactDelegate>
....
// SKScene.m:
static uint32_t const OBJECT_CATEGORY = 0x1 << 0;
static uint32_t const ENEMY_CATEGORY = 0x1 << 1;
#implementation MyScene
- (id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
.......
self.physicsWorld.contactDelegate = self;
........
}
return self;
}
.......
- (void)didBeginContact:(SKPhysicsContact *)contact{
SKPhysicsBody *firstBody, *secondBody;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) {
firstBody = contact.bodyA;
secondBody = contact.bodyB;
}
else {
firstBody = contact.bodyB;
secondBody = contact.bodyA;
}
if (((firstBody.categoryBitMask & OBJECT_CATEGORY) != 0) &&
(secondBody.categoryBitMask & ENEMY_CATEGORY) != 0) {
NSLog(#"Collision detected!");
}
#end