I have an issue with parallel scrolling with an object on my game , my object is a line that should be repeated , but my code scrolls the line out of screen and then it returns to the first position and scroll again :
- (void)bricksEdgeAnimation {
SKSpriteNode *bEdge = [[SKSpriteNode alloc]initWithImageNamed:#"edge.png"];
bEdge.position = self.view.center;
bEdge.name = #"edge";
[self addChild:bEdge];
}
- (void)moveBg
{
[self enumerateChildNodesWithName:#"edge" usingBlock: ^(SKNode *node, BOOL *stop)
{
SKSpriteNode * bg = (SKSpriteNode *) node;
bg.position = CGPointMake(bg.position.x , bg.position.y - SPEED);
if (bg.position.y <= -bg.size.width)
{
bg.position = CGPointMake(bg.position.x ,
bg.position.y + bg.size.width*2);
}
}];
}
-(void)update:(CFTimeInterval)currentTime {
if (_lastUpdateTime)
{
_dt = currentTime - _lastUpdateTime;
}
else
{
_dt = 0;
}
_lastUpdateTime = currentTime;
[self moveBg];
}
it should be like this :
how should change my code to repeat this line after each other ?
Add a second "edge" node:
- (void)bricksEdgeAnimation {
SKSpriteNode *bEdge = [[SKSpriteNode alloc]initWithImageNamed:#"edge.png"];
bEdge.position = self.view.center;
bEdge.name = #"edge";
[self addChild:bEdge];
//2nd node - note the name is the same
SKSpriteNode *bEdge1 = [[SKSpriteNode alloc]initWithImageNamed:#"edge.png"];
bEdge1.position = CGPointMake(bEdge.position.x,bEdge.position.y+(bEdge.size.height));
bEdge1.name = #"edge";
[self addChild:bEdge1];
}
//note I changed "width" to "height"
- (void)moveBg
{
[self enumerateChildNodesWithName:#"edge" usingBlock: ^(SKNode *node, BOOL *stop)
{
SKSpriteNode * bg = (SKSpriteNode *) node;
bg.position = CGPointMake(bg.position.x , bg.position.y - SPEED);
if (bg.position.y <= -bg.size.width)
{
bg.position = CGPointMake(bg.position.x ,
bg.position.y + bg.size.height*2);
}
}];
}
Related
The following code I'm using is to end the game when I my number of balls in the scene reaches zero. Now I'm not getting any error when I put the code in but it doesn't do any thing as of counting the balls and reacting to that count. I am fairly new to sprite kit so I understand that this is a problem that comes so easy to others but this is the first time of worked with reacting to the count of a certain sprite in a scene so please help.
SKSpriteNode *ball;
int numberOfBalls = 3;
#implementation EasyScene
-(void)didBeginContact:(SKPhysicsContact *)contact {
if ([self isGameWon]) {
EasyEndGameScene *end = [EasyEndGameScene sceneWithSize:self.size];
[self.view presentScene:end transition:[SKTransition doorsCloseHorizontalWithDuration:1]];
}
}
-(BOOL)isGameWon {
int numberOfBalls = 3;
for (SKNode* node in self.children) {
if ([node.name isEqual: ball]) {
numberOfBalls = 0;
}
}
return numberOfBalls =0;
}
- (void) addBalls:(CGSize)size {
for (int i = 0; i < 3; i++) {
//create brick sprite from image
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball-image"];
ball.name = #"ball";
//resize balls
ball.size = CGSizeMake(self.size.width/5.5, self.size.width/5.5);
//position and space out balls
int xPos = size.width/3 * (i+.5);
int yPos = self.size.height - (self.size.width/7);
ball.position = CGPointMake(xPos, yPos);
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.size.width/2];
ball.physicsBody.categoryBitMask = ballCategory;
ball.physicsBody.contactTestBitMask = bottomEdgeCategory;
[self addChild:ball];
}
}
In the following code I got rid of the Global Variable and tested all nodes for the specified name of #"ball" and return YES if none were found:
static const uint32_t ballCategory = 1; //00000000000000000000000000000001
static const uint32_t edgeCategory = 2; //00000000000000000000000000000010
static const uint32_t bottomEdgeCategory = 4; //00000000000000000000000000000100
SKSpriteNode *ball;
#implementation EasyScene
-(void)didBeginContact:(SKPhysicsContact *)contact {
//create placeholder for the "non ball" object
SKPhysicsBody *notTheBall;
SKPhysicsBody *theBall;
if (contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask) {
notTheBall = contact.bodyB;
theBall = contact.bodyA;
} else {
notTheBall = contact.bodyA;
theBall = contact.bodyB;
}
if (notTheBall.categoryBitMask == bottomEdgeCategory) {
NSLog(#"hit bottom edge");
// SKAction *playSFX = [SKAction playSoundFileNamed:#"gameover.mp3" waitForCompletion:NO];
// [self runAction:playSFX];
// EasyEndGameScene *end = [EasyEndGameScene sceneWithSize:self.size];
// [self.view presentScene:end transition:[SKTransition doorsCloseHorizontalWithDuration:1]];
// [GameState sharedInstance].score = 0;
// [gameMusic pause];
[theBall.node removeFromParent];
}
if ([self isGameWon]) {
EasyEndGameScene *end = [EasyEndGameScene sceneWithSize:self.size];
[self.view presentScene:end transition:[SKTransition doorsCloseHorizontalWithDuration:1]];
}
}
-(BOOL)isGameWon {
unsigned count = 0;
for (SKNode* node in self.children)
if ([node.name isEqual:ball])
count++;
return count == 0;
}
- (void) addBalls:(CGSize)size {
for (int i = 0; i < 3; i++) {
//create brick sprite from image
SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:#"ball-image"];
ball.name = #"ball";
//resize balls
ball.size = CGSizeMake(self.size.width/5.5, self.size.width/5.5);
//position and space out balls
int xPos = size.width/3 * (i+.5);
int yPos = self.size.height - (self.size.width/7);
ball.position = CGPointMake(xPos, yPos);
ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.size.width/2];
ball.physicsBody.categoryBitMask = ballCategory;
ball.physicsBody.contactTestBitMask = bottomEdgeCategory;
[self addChild:ball];
}
}
Remove the ball global variable, as it's not needed.
Test all nodes for the specified name of #"ball" and return YES if none were found:
-(BOOL)isGameWon {
for (SKNode* node in self.children)
if ([node.name isEqualToString:#"ball"])
return NO;
return YES;
}
I think it should be
return numberOfBalls == 0
in your isgameWon method
you forget an extra =
I have my background set and it is scrolling horizontally, here is my code:
-(void)initalizingScrollingBackground
{
for (int i = 0; i < 2; i++)
{
SKSpriteNode *bg = [SKSpriteNode spriteNodeWithImageNamed:#"background"];
bottomScrollerHeight = bg.size.height;
bg.position = CGPointMake(i * bg.size.width, 0);
bg.anchorPoint = CGPointZero;
bg.name = #"background";
[self addChild:bg];
}
}
and also this code:
- (void)moveBottomScroller
{
[self enumerateChildNodesWithName:#"background" usingBlock: ^(SKNode *node, BOOL *stop)
{
SKSpriteNode * bg = (SKSpriteNode *) node;
CGPoint bgVelocity = CGPointMake(-BG_VELOCITY, 0);
CGPoint amtToMove = CGPointMultiplyScalar(bgVelocity,_dt);
bg.position = CGPointAdd(bg.position, amtToMove);
//Checks if bg node is completely scrolled off the screen, if yes then put it at the end of the other node
if (bg.position.x <= -bg.size.width)
{
bg.position = CGPointMake(bg.position.x + bg.size.width*2,
bg.position.y);
}
[bg removeFromParent];
[self addChild:bg]; //Ordering is not possible. so this is a hack
}];
}
The second part makes the background scroll. Without it, the background is still.
Also, without the movebottomscroller, my sprite appears on top of the background. With the movebottomscroller, he appears behind the scrolling background. Is there any command to bring him to the front, above any other backgrounds?
Thank you!
Try the approach below, hope that works for you.
#interface GameScene()
#property (nonatomic) NSTimeInterval lastTimeSceneRefreshed;
#end
#implementation GameScene
- (instancetype)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
[self buildBackground];
[self startScrolling];
}
return self;
}
// This method will add 3 background nodes
- (void)buildBackground {
float centerX = CGRectGetMidX(self.frame);
SKSpriteNode *firstBackgroundNode = [SKSpriteNode spriteNodeWithImageNamed:#"background"];
firstBackgroundNode.name = #"background";
firstBackgroundNode.position = CGPointMake(centerX,
firstBackgroundNode.size.height*firstBackgroundNode.anchorPoint.y);
[self addChild:firstBackgroundNode];
float previousYPosition = firstBackgroundNode.position.y;
for (int i = 0; i < 2; i++) {
SKSpriteNode *backgroundNode = [SKSpriteNode spriteNodeWithImageNamed:#"background"];
backgroundNode.position = CGPointMake(centerX,
previousYPosition + backgroundNode.frame.size.height);
previousYPosition = backgroundNode.position.y;
backgroundNode.name = #"background";
[self addChild:backgroundNode];
}
}
- (void)update:(CFTimeInterval)currentTime {
// Updating background nodes
// We don't want to update backgrounds each frame (60 times per second)
// Once per second is enough. This will reduce CPU usage
if (currentTime - self.lastTimeSceneRefreshed > 1) {
[self backgroundNodesRepositioning];
self.lastTimeSceneRefreshed = currentTime;
}
}
- (void)backgroundNodesRepositioning {
[self enumerateChildNodesWithName:#"background" usingBlock: ^(SKNode *node, BOOL *stop)
{
SKSpriteNode *backgroundNode = (SKSpriteNode *)node;
if (backgroundNode.position.y + backgroundNode.size.height < 0) {
// The node is out of screen, move it up
backgroundNode.position = CGPointMake(backgroundNode.position.x, backgroundNode.position.y + backgroundNode.size.height * 3);
}
}];
}
- (void)startScrolling {
SKAction *moveAction = [SKAction moveByX:0 y:-200 duration:1];
[self enumerateChildNodesWithName:#"background" usingBlock: ^(SKNode *node, BOOL *stop)
{
[node runAction:[SKAction repeatActionForever:moveAction] withKey:#"movement"];
}];
}
I don't fully understand your approach here, but I can answer your question so I'll just go ahead and do that - I hope I haven't misunderstood.
SKNode has a method insertChild:atIndex: that would allow you to put the background nodes at the back, or put the sprite at the front.
SKNode Class Reference
While moving the character it must stay inside a rectangle centred on the screen and all other game objects must scroll.
But as you get to the edge of the world it must repeat.
The characters can move in any direction.
You have to divide the world in 3 sections. Section 1 and 3 must be identical. If you reach the end of the world (Section 3) you can switch back to section 1.
http://www.youtube.com/watch?v=-FX-tFks5pg
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
_background = [SKSpriteNode spriteNodeWithImageNamed:#"background"];
_background.anchorPoint = CGPointMake(0, 0);
_background.name = #"background";
_background.position = CGPointMake(0, 0);
[self addChild:_background];
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
if (_lastUpdateTime) {
_deltaTime = currentTime - _lastUpdateTime;
} else {
_deltaTime = 0;
}
_lastUpdateTime = currentTime;
if (_deltaTime > 1) {
_deltaTime = 1.0 / 60.0;
}
[self enumerateChildNodesWithName:#"background" usingBlock:^(SKNode *node, BOOL *stop) {
node.position = CGPointMake(node.position.x - backgroundMoveSpeed * _deltaTime, node.position.y);
if (node.position.x < - (node.frame.size.width + 100)) {
[node removeFromParent];
}
}];
if (_background.position.x < -bound) {
//bound = 500
SKSpriteNode *temp = [SKSpriteNode spriteNodeWithImageNamed:#"background"];
temp.anchorPoint = CGPointMake(0, 0);
temp.name = #"background";
temp.position = CGPointMake(_background.position.x + _background.frame.size.width, 0);
[self addChild:temp];
_background = temp;
}
the background image's size is 2048x640, so you should change the bound according to your background image's size.
I am trying to change a SKSpriteNode's texture while it is animated , but I faced with FPS dropping ! it goes down from 60 to 30 ! on both device and simulator ! the node is a parallel scrolling background , and here is the codes :
- (void)createBricksEdge {
brickEdges = [[SKSpriteNode alloc]initWithImageNamed:#"edge.png"];
brickEdges.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame));;
brickEdges.name = #"edge";
[self addChild:brickEdges];
bEdge1 = [[SKSpriteNode alloc]initWithImageNamed:#"edge.png"];
bEdge1.position = CGPointMake(brickEdges.position.x,brickEdges.position.y+(brickEdges.size.height));
bEdge1.name = #"edge";
[self addChild:bEdge1];
}
moving background :
- (void)moveBg
{
[self enumerateChildNodesWithName:#"edge" usingBlock: ^(SKNode *node, BOOL *stop)
{
SKSpriteNode * bg = (SKSpriteNode *) node;
if (isSpeedBonus == YES) {
SPEED = 200;
} else {
switch (speedCriteria) {
case 0:
SPEED = 7.0;
break;
case 1:
SPEED = 11;
NSLog(#"FPS drops");
[bg runAction:[SKAction setTexture:[SKTexture textureWithImage:[UIImage imageNamed:#"edgeSpeed.png"]]]];
//I also tried : [bg setTexture:textre];
break;
.
.
.
.
.
}
}
bg.position = CGPointMake(bg.position.x , bg.position.y - SPEED);
if (bg.position.y <= -bg.size.width)
{ bg.position = CGPointMake(bg.position.x ,bg.position.y + bg.size.height*2); }} ];
}
Updating frames :
- (void)speedOMeter
{
int i = (int)[scoreLabel.text integerValue];
if (i <= 1000) {
speedCriteria = 0;
} else if (i <= 1500) {
speedCriteria = 1;
} else if (i <=2000) {
speedCriteria = 2;
} else if (i <= 2500) {
.
.
.
.
}
- (void)update:(CFTimeInterval)currentTime {
if (_lastUpdateTime)
{
_dt = currentTime - _lastUpdateTime;
}
else
{
_dt = 0;
}
_lastUpdateTime = currentTime;
[self moveBg]; [self speedOMeter];
}
You're bypassing the Sprite Kit caching mechanisms by creating the image first as a UIImage. This will load the image from disk, possibly every time:
[bg runAction:[SKAction setTexture:[SKTexture textureWithImage:[UIImage imageNamed:#"edgeSpeed.png"]]]];
Besides that you're overdoing it with the action. Try again with the simplified version that'll give you the same result by simply assigning the texture:
bg.texture = [SKTexture textureWithImageNamed:#"edgeSpeed.png"];
I have to move background images in iOS Coco2d but I am having a few difficulties. I have tried some solutions provided on some websites but have not been successful in getting them to work properly. Below is the code I am currently working on:-
The background moves smoothly the first time but it is not working properly after that:-
Code in init function :-
bg1 = [CCSprite spriteWithFile: #"bg1.png"];
bg1.anchorPoint = CGPointZero;
[self addChild:bg1 z:-2];
bg2 = [CCSprite spriteWithFile: #"bg1.png"];
[self addChild:bg2 z:-3];
bg2.anchorPoint = CGPointMake(480, 0);
// schedule a repeating callback on every frame
[self schedule:#selector(nextFrame:) interval:.4f];
- (void) nextFrame:(ccTime)dt {
id actionMove = [CCMoveTo actionWithDuration:.4 position:ccp(bg1.position.x - 100 * dt, bg1.position.y)]; //winSize.height/2)];
id actionMove1 = [CCMoveTo actionWithDuration:.4 position:ccp(bg2.position.x - 100 * dt, bg2.position.y)]; //winSize.height/2)];
id actionMoveDone = [CCCallFuncN actionWithTarget:self selector:#selector(spriteMoveFinished:)];
[bg1 runAction:[CCSequence actions:actionMove,actionMoveDone, nil]];
[bg2 runAction:[CCSequence actions:actionMove1,actionMoveDone, nil]];
}
-(void)spriteMoveFinished:(id)sender {
CCSprite *sprite = (CCSprite *)sender;
if(sprite == bg1) {
if (bg1.position.x < -480) {
[self removeChild:bg1 cleanup:NO];
bg1.position = ccp( 480 , bg1.position.y );
[self addChild:bg1 z:-2];
}
}
else if(sprite == bg2)
if (bg2.position.x < -480) {
[self removeChild:bg2 cleanup:NO];
bg2.position = ccp( bg1.position.x+ 480 , bg1.position.y );
[self addChild:bg2 z:-3];
}
}
}
Try this, make sure you flip background 2.
#define IS_IPAD (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
#define MM_BG_SPEED_DUR ( IS_IPAD ? (6.0f) : (2.0f) )
-(void)onEnter
{
[super onEnter];
[self initBackground];
[self schedule: #selector(tick:)];
}
-(void)initBackground
{
NSString *tex = #"BG/Background.png";//[self getThemeBG];
mBG1 = [CCSprite spriteWithFile:tex];
mBG1.position = ccp(s.width*0.5f,s.height*0.5f);
[self addChild:mBG1 z:LAYER_BACKGROUND];
mBG2 = [CCSprite spriteWithFile:tex];
mBG2.position = ccp(s.width+s.width*0.5f,s.height*0.5f);
mBG2.flipX = true;
[self addChild:mBG2 z:LAYER_BACKGROUND];
}
-(void)scrollBackground:(ccTime)dt
{
CGSize s = [[CCDirector sharedDirector] winSize];
CGPoint pos1 = mBG1.position;
CGPoint pos2 = mBG2.position;
pos1.x -= MM_BG_SPEED_DUR;
pos2.x -= MM_BG_SPEED_DUR;
if(pos1.x <=-(s.width*0.5f) )
{
pos1.x = pos2.x + s.width;
}
if(pos2.x <=-(s.width*0.5f) )
{
pos2.x = pos1.x + s.width;
}
mBG1.position = pos1;
mBG2.position = pos2;
}
-(void)tick:(ccTime)dt
{
[self scrollBackground:dt];
}
I think this way is a little simpler. You initialize the backgrounds in initand move them in update.
In the init method:
// position backgrounds
CCSprite *bg1 = [CCSprite spriteWithSpriteFrame:spriteFrame];
CCSprite *bg2 = [CCSprite spriteWithSpriteFrame:spriteFrame];
CCSprite *bg3 = [CCSprite spriteWithSpriteFrame:spriteFrame];
bg1.anchorPoint = ccp(0, 0);
bg1.position = ccp(0, 0);
bg2.anchorPoint = ccp(0, 0);
bg2.position = ccp(bg1.contentSize.width-1, 0);
bg3.anchorPoint = ccp(0, 0);
bg3.position = ccp(2*bg1.contentSize.width-1, 0);
_backgrounds = #[bg1, bg2, bg3];
[self addChild:bg1 z:INT_MIN];
[self addChild:bg2 z:INT_MIN];
[self addChild:bg3 z:INT_MIN];
In the update method:
// endless scrolling for backgrounds
for (CCSprite *bg in _backgrounds) {
bg.position = ccp(bg.position.x - 50 * delta, bg.position.y);
if (bg.position.x < -1 * (bg.contentSize.width)) {
bg.position = ccp(bg.position.x + (bg.contentSize.width*2)-2, 0);
}
}
Note: the code is for Cocos2d 3.0