I am making a game with sprite kit and objective c. Currently I am trying to make my background scroll infinitely. I cannot seem to make this work. Here is my code:
SKAction method
-(void) setUpActions {
SKAction* move = [SKAction moveByX:-landscape.frame.size.width * 2 y:0 duration:2.0];
SKAction* reset = [SKAction moveByX:landscape.frame.size.width * 2 y:0 duration:0.0];
SKAction* moveInfinitely = [SKAction sequence:#[move, reset]];
//background and log Moving Actions
moveOver = [SKAction repeatActionForever:moveInfinitely];
}
SKAction calling method
-(void) runTheAction {
[landscape runAction:moveOver];
}
When I run the app nothing shows up on my screen.
Create two background sprites.
// create 2 background sprites
bg1 = [SKSpriteNode spriteNodeWithImageNamed:#"bg1"];
bg1.anchorPoint = CGPointZero;
bg1.position = CGPointMake(0, 0);
[self addChild:bg1];
bg2 = [SKSpriteNode spriteNodeWithImageNamed:#"bg2"];
bg2.anchorPoint = CGPointZero;
bg2.position = CGPointMake(bg1.size.width-1, 0);
[self addChild:bg2];
Then in update method:
bg1.position = CGPointMake(bg1.position.x-4, bg1.position.y);
bg2.position = CGPointMake(bg2.position.x-4, bg2.position.y);
if (bg1.position.x < -bg1.size.width){
bg1.position = CGPointMake(bg2.position.x + bg2.size.width, bg1.position.y);
}
if (bg2.position.x < -bg2.size.width) {
bg2.position = CGPointMake(bg1.position.x + bg1.size.width, bg2.position.y);
}
This should be pretty straightforward
Related
I'm creating an iOS iPhone game similar to tetris where blocks fall from the sky and stack up on each other. However, my SpriteNodes blocks randomly disappear sometimes when a block comes on top of another one.
This is my block placement, I call this for 10 iterations to place random blocks that fall:
-(void)setupBlocksForT:(float)time {
Block *block = (Block *)[SKSpriteNode spriteNodeWithImageNamed:#"block1"];
block.physicsBody = [SKPhysicsBody bodyWithTexture:block.texture size:block.size];
block.physicsBody.dynamic = YES;
block.physicsBody.allowsRotation = NO;
block.physicsBody.usesPreciseCollisionDetection = YES;
block.physicsBody.restitution = 0;
block.physicsBody.friction = 1.0;
block.physicsBody.categoryBitMask = BlockMask;
block.physicsBody.collisionBitMask = CharacterMask | GroundMask | BlockMask;
block.physicsBody.contactTestBitMask = BlockMask | CharacterMask;
double randomSize = rand_range_double(0.10, 0.5);
block.xScale = randomSize;
block.yScale = randomSize;
block.position = CGPointMake(rand_range_int(0, self.frame.size.width, self.frame.size.height);
SKAction *wait = [SKAction waitForDuration:1.5 * time];
SKAction *spawn = [SKAction runBlock:^{
[self.myWorld addChild: block];
}];
SKAction *spawnSequence = [SKAction sequence:#[wait, spawn]];
[self runAction:spawnSequence];
}
Nowhere in my code do I call a remove(node).
I'm developing using SpriteKit and my setup is having an SKNode that contains all of my blocks so that the camera stays focused on my character's position in the DidSimulatePhysics() method.
Has anyone run into an issue where their sprites are randomly disappearing?
I have a row of 5 sprites and they spawn every 4 seconds and move down along the Y-axis. The sprites are spawning the correct amount each time, I have 5 sprites equal spaced apart across the screen, they're all center perfectly.
However when the performSelector action is called, when it spawns them in they don't go to the right position. The move over to the left so far that I can only see half a sprite on the left side of the screen. After testing it, it seems they are all stacked on top of each other at the wrong position.
Any idea whats going on? I'd appreciate any help. Here's all the code I'm using in the scene.
-(void) addBricks:(CGSize)size {
for (int i = 0; i < 5; i++) {
//create brick sprite from image
SKSpriteNode *brick = [SKSpriteNode spriteNodeWithImageNamed:#"brick"];
//resize bricks
brick.size = CGSizeMake(60, 30);
//psoition bricks
int xPos = size.width/7.5 * (i+.5);
int yPos = 450;
brick.position = CGPointMake(xPos, yPos);
//add move action
SKAction *wait = [SKAction waitForDuration:3];
SKAction *move = [SKAction moveByX:0 y:-36.9 duration:1];
SKAction *sequence = [SKAction sequence:#[wait, move]];
SKAction *repeatMove = [SKAction repeatActionForever:sequence];
[brick runAction:repeatMove];
[self addChild:brick];
}
}
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
self.backgroundColor = [SKColor colorWithRed:(243.0f/255) green:(228.0f/255) blue:(165.0f/255) alpha:1.0];
//add action to spawn bricks
SKAction *spawn = [SKAction performSelector:#selector(addBricks:) onTarget:(self)];
SKAction *delay = [SKAction waitForDuration:4];
SKAction *delayThenSpawn = [SKAction sequence:#[delay, spawn]];
[self runAction:[SKAction repeatActionForever:delayThenSpawn]];
[self addBricks:size];
}
return self;
}
as LearnCocos2D mentioned in your last question.. you cant use a selector when youre passing a parameter into a method.
addBricks expects size .. you arent passing size into it.
change your spawn action to
SKAction *spawn = [SKAction runBlock:^{
// make this whatever size you want, i'm just using the scene's size
[self addBricks:self.size];
}];
that should get you started
I'm working on a game that has 3 clouds in the background which are each SKSpriteNodes. In order to create a parallax effect I'm moving them down the screen as the character is moving up (the screen is moving up as well).
I removing them in the update method after they reach the bottom of the screen. I would like to add them back at a Y position 20px above the viewable scene so that would be 500x on an iPhone 4 and 588px on a iPhone 5. Then just repeat over and over.
Then only way I can think of to do this is to chain SKActions and run a sequence, but I don't think that is the best way. I'm trying to find a way to add them back after they have been removed in the update method.
-(id)initWithSize:(CGSize)size {
...
//Moving Clouds
[self performSelector:#selector(createClouds) withObject:nil afterDelay:.2];
}
-(void)createClouds {
SKSpriteNode *cloud1 = [SKSpriteNode spriteNodeWithImageNamed:#"cloud1"];
cloud1.position = CGPointMake(40, 200);
cloud1.xScale = .5;
cloud1.yScale = .5;
cloud1.name = #"Cloud1";
cloud1.zPosition = 0;
SKAction *moveCloud1 = [SKAction moveToY:-20 duration:15];
[cloud1 runAction:[SKAction repeatActionForever:moveCloud1]];
[self addChild:cloud1];
SKSpriteNode *cloud2 = [SKSpriteNode spriteNodeWithImageNamed:#"cloud2"];
cloud2.position = CGPointMake(300, 320);
cloud2.xScale = .5;
cloud2.yScale = .5;
cloud2.name = #"Cloud2";
cloud2.zPosition = 0;
SKAction *moveCloud2 = [SKAction moveToY:-40 duration:15];
[cloud2 runAction:[SKAction repeatActionForever:moveCloud2]];
[self addChild:cloud2];
SKSpriteNode *cloud3 = [SKSpriteNode spriteNodeWithImageNamed:#"cloud3"];
cloud3.position = CGPointMake(200, 450);
cloud3.xScale = .5;
cloud3.yScale = .5;
cloud3.name = #"Cloud3";
cloud3.zPosition = 0;
SKAction *moveCloud3 = [SKAction moveToY:-200 duration:20];
[cloud3 runAction:[SKAction repeatActionForever:moveCloud3]];
[self addChild:cloud3];
}
-(void)update:(CFTimeInterval)currentTime {
....
// Remove Cloud from parent
[self enumerateChildNodesWithName:#"Cloud1" usingBlock:^(SKNode *node, BOOL *stop) {
if (node.position.x < 0 || node.position.y < 0) {
[node removeFromParent];
//Add node back to the scene at a Y position above the screen then move
// the cloud downwards again. Repeat Forever.
// Exp: Move Cloud 1 to X position 40, Y position 500 (20 pixels above the top of the screen for an iPhone 4s)
}
else {
// Do something?
}
}];
You can add an SKAction to move your cloud back to the top:
SKSpriteNode *cloud1 = [SKSpriteNode spriteNodeWithImageNamed:#"cloud1"];
cloud1.position = CGPointMake(40, 200);
cloud1.xScale = .5;
cloud1.yScale = .5;
cloud1.name = #"Cloud1";
cloud1.zPosition = 0;
SKAction *moveCloud1 = [SKAction moveToY:-20 duration:15];
// SKAction to move cloud back to top of screen
SKAction *moveToTop = [SKAction moveToY:CGRectGetHeight(self.frame)+20 duration:0];
SKAction *cloud1Action = [SKAction sequence:#[moveCloud1, moveToTop]];
[cloud1 runAction:[SKAction repeatActionForever:cloud1Action]];
You won't need the code in the update method.
I think you can simply change the position
Also, use CGRectGetMinY to use relative positioning, easier to manage different screen sizes.
And check only the Y position too, because X won't change if they're moving vertically.
This is my idea:
-(void)update:(NSTimeInterval)currentTime {
for(int i = 1; i<=3; i++){
NSString* cloud = [NSString stringWithFormat:#"Cloud%d",i];
[self enumerateChildNodesWithName:cloud usingBlock:^(SKNode *node, BOOL *stop) {
if (node.position.y < 0) {
node.position = CGPointMake(node.position.x,CGRectGetMaxY(self.frame)+20);
}
}];
}
}
I've created this SKSpriteNode which is the moving background in the background. What i would like to is being able to stop all actions which i've done by
[self removeAllAction]
Which works, but not on the moving background why? and how can i obtain this
SKTexture* groundTexture = [SKTexture textureWithImageNamed:#"layer-1"];
groundTexture.filteringMode = SKTextureFilteringNearest;
SKAction* moveGroundSprite = [SKAction moveByX:-groundTexture.size.width*2 y:0 duration:0.02 * groundTexture.size.width*2];
SKAction* resetGroundSprite = [SKAction moveByX:groundTexture.size.width*2 y:0 duration:0];
moveGroundSpritesForever = [SKAction repeatActionForever:[SKAction sequence:#[moveGroundSprite, resetGroundSprite]]];
for( int i = 0; i < 2 + self.frame.size.width; ++i ) {
// Create the sprite
sprite = [SKSpriteNode spriteNodeWithTexture:groundTexture];
[sprite setScale:1.0];
sprite.position = CGPointMake(i * sprite.size.width, sprite.size.height / 2);
[sprite runAction:moveGroundSpritesForever withKey:#"bg"];
[self addChild:sprite];
}
This is my code to make my background repeat, just one background and it should be repeating forever:
SKTexture* bgTexture = [SKTexture textureWithImageNamed:#"nightbackground"];
bgTexture.filteringMode = SKTextureFilteringNearest;
SKAction* movebgSprite = [SKAction moveByX:-bgTexture.size.width*2 y:0 duration:0.1 * bgTexture.size.width*2];
SKAction* resetbgSprite = [SKAction moveByX:bgTexture.size.width*2 y:0 duration:0];
SKAction* movebgSpritesForever = [SKAction repeatActionForever:[SKAction sequence:#[movebgSprite, resetbgSprite]]];
for( int i = 0; i < 2 + self.frame.size.width / ( bgTexture.size.width * 2 ); ++i ) {
SKSpriteNode* sprite = [SKSpriteNode spriteNodeWithTexture:bgTexture];
[sprite setScale:1.0];
sprite.zPosition = -20;
sprite.position = CGPointMake(self.size.width/2, self.size.height/2);
[sprite runAction:movebgSpritesForever];
[self addChild:sprite];
But it does not repeat forever, it stops after a while. What might be wrong with it?
This case will work in landscape orientation and have the view repeat scrolling infinitely to the left (-x direction). You create two instances of the background SKSPriteNode and place them next to each other. When the first one scrolls completely off the left side of the screen, it is placed to the right of the second background sprite node.
in didMoveToView:
for (int i = 0; i < 2; i++) {
SKSpriteNode *bg = [SKSpriteNode spriteNodeWithImageNamed:#"background"];
bg.anchorPoint = CGPointZero;
bg.position = CGPointMake(i * bg.size.width, 0);
bg.name = #"starBackground";
[self addChild:bg];
}
in the update: loop
[self enumerateChildNodesWithName:#"background" usingBlock:^(SKNode *node, BOOL *stop) {
SKSpriteNode *bg = (SKSpriteNode *)node;
bg.position = CGPointMake(bg.position.x - 1.5, bg.position.y);
if (bg.position.x <= -bg.size.width) {
bg.position = CGPointMake(bg.position.x + bg.size.width * 2, bg.position.y);
}
}];