I have a sprite that I am rotating on a menu screen in my Cocos2d game like this:
CCAction* action = [CCRepeatForever actionWithAction:
[CCRotateBy actionWithDuration:1.0 angle:90.0f]];
[sprite runAction:action];
The problem occurs when I send the game to the background, and then resume the game. If the send to background / resume operation is quick there is a slight glitch. The longer the game stays in the background, the longer the sprite will "twitch" when the game resumes, before it will begin rotating normally again. I am on Cocos2d 2.0, Xcode 4.5, running on iOS 6.
Edit: Good point Gangcil! Here is what I had (it was, I believe, from the Cocos2d boilerplate:
// getting a call, pause the game
-(void) applicationWillResignActive:(UIApplication *)application
{
if( [_navController visibleViewController] == _director )
[_director pause];
}
// call got rejected
-(void) applicationDidBecomeActive:(UIApplication *)application
{
if( [_navController visibleViewController] == _director )
[_director resume];
}
I was able to get the problem to go away by changing these functions to:
// getting a call, pause the game
-(void) applicationWillResignActive:(UIApplication *)application
{
if( [_navController visibleViewController] == _director )
{
[_director stopAnimation];
[_director pause];
}
}
// call got rejected
-(void) applicationDidBecomeActive:(UIApplication *)application
{
if( [_navController visibleViewController] == _director )
{
[_director stopAnimation];
[_director resume];
[_director startAnimation];
}
}
I am not sure if this was the correct approach or not - there is a slight hesitation at first (understandably), but then the animation commences smoothly. The slight hesitation is better than the wild jittering that I saw before - but I don't know if this solution can be improved on.
Related
I have an image that loads on a MainMenu scene and appears as wrong sized when the game launches but then after finishing a level returns you to the MainMenu again the image appears right sized.
The first time the image appears to be three quarters or 4/5 of the size of the screen from left to right. The image has a white background around it so I can see a black tall rectangle in the right side of the screen on the main menu's first launch. But after a game it is sized properly and the white background image is sized properly.
Anybody ever have this happen?
Here is the init code for the MainMenuLayer:
-(id)init {
if( (self=[super initWithColor:ccc4(255,255,255,255)]) ) {
[[GameManager sharedGameManager] playBackgroundTrack:BACKGROUND_TRACK_MAIN_MENU];
CGSize screenSize = [CCDirector sharedDirector].winSize;
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
CCSprite *background = [CCSprite spriteWithFile:#"MainMenu-iPad.png"];
[background setPosition:ccp(screenSize.width/2,screenSize.height/2)];
[self addChild:background];
[self displayMainMenu];
} else {
CCSprite *background = [CCSprite spriteWithFile:#"MainMenu.png"];
[background setPosition:ccp(screenSize.width/2,screenSize.height/2)];
[self addChild:background];
[self displayMainMenu];
}
-
It works fine on the simulator though...
Print screen position, if position is wrong then put you code in onEnter instead of init.
See this thread in Stack overflow.
-(id)init {
if( (self=[super initWithColor:ccc4(255,255,255,255)]) ) {
}
return self;
}
-(void)onEnter {
[super onEnter];
[[GameManager sharedGameManager] playBackgroundTrack:BACKGROUND_TRACK_MAIN_MENU];
CGSize screenSize = [CCDirector sharedDirector].winSize;
CCSprite *background = [CCSprite spriteWithFile:#"MainMenu.png"];
[background setPosition:ccp(screenSize.width/2,screenSize.height/2)];
[self addChild:background];
[self displayMainMenu];
}
The image was apparently being cached even after clean and build! I ended up replacing the image by removing the original and adding the same one but with some markers just to make sure it got replaced.
I'm trying to implement a game with cocos2d. I enabled arc according to the instructions on this tutorial.
http://www.learn-cocos2d.com/2012/04/enabling-arc-cocos2d-project-howto-stepbystep-tutorialguide/
I realized a weird behavior after replacing game scene with main menu scene and I can't figure out the problem. After replacement, the new scene appears and works as I expected, but the game scene (old scene) still reacts touches. I thought that when I replace the scene, old scene should be removed completely, but it continue to live under the new scene.
Some of the relevant code is as follows:
Singleton:
+(void) go: (CCLayer *) layer{
CCDirector *director = [CCDirector sharedDirector];
CCScene *newScene = [Singelton wrap:layer];
if ([director runningScene]) {
[director replaceScene: [CCTransitionFlipX transitionWithDuration:0.5 scene:newScene]];
} else {
[director pushScene:newScene];
}
}
+(CCScene *) wrap: (CCLayer *) layer{
CCScene *newScene = [CCScene node];
[newScene addChild: layer];
return newScene;
}
+(void) mainMenu
{
CCLayer *layer = [MainMenu node];
[Singleton go:layer];
}
When I need to go to main menu scene I call singleton class as follows
[Singleton mainMenu]
How can I kill the game scene after menu scene appears?
Thanks for your help.
What does Singleton do? I suspect that it might be the cause, holding on to references of the Scene/Layer or any other nodes while/after replacing a scene.
I have a game with animation. In game scene, I use the method below to pause my game (it works perfectly, because the game is paused when the users taps on any point of the iOS device):
-(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch=[touches anyObject];
CGPoint locationOfTouch=[self convertTouchToNodeSpace: touch];
CGRect rectOfScreen=CGRectMake(0, 0, screenSize.width, screenSize.height);
if (CGRectContainsPoint(rectOfScreen, locationOfTouch))
{
[[CCDirector sharedDirector] replaceScene:[PauseScene scene]];
[self unschedule:#selector(spawnEnemies:)];
[self unschedule:#selector(checkCollisionOfEnemyWithBullet:)];
[self unschedule:#selector(update:)];
[self unschedule:#selector(isJoystickActivated:)];
[self unschedule:#selector(checkHasGameEnded:)];
[[CCDirector sharedDirector] pause];
}
}
To implement resume action, I'v created PauseLayer:CCLayer, where I've implemented the following method to resume the game:
-(void) continueGame:(id)sender
{
[[CCDirector sharedDirector] resume];
[[CCDirector sharedDirector] replaceScene:[GameSceneLayer scene]];
//[self resumeSchedulerAndActions];
}
Here is the code, how I envoke the method above:
CCMenuItemFont* continue_game=[CCMenuItemFont itemWithString:#"continue game" target:self selector:#selector(continueGame:)];
But, when I select continue game, the game start from the blank point: every game state, every game character will be new. How can I resume my game from the intial point where it was paused by user? Thank you!
You can use these two cocos2D function to pause and resume:
[self pauseSchedulerAndActions]; //pause
[self resumeSchedulerAndActions];//resume
Also maintain one bool variable, and check that whenever u need.
bool mISGamePaused;
I am coding a modal layer in cocos2d and I would like to use the OpenGL glScissor API call to crop the inside of a CCScrollLayer that I am using,
Basically,
Present some kind of Modal sprite
Put CCScrollLayer with assets on the modal sprite
I want to crop the CCScrollLayer so that it does not overflow the sprite.
Seems pretty simple.
The problem I'm having is that the visit function never seems to be get hit and thus glScissor never gets implemented.
I'm not sure what I'm doing wrong.
The way I do modals is I use blocks to handle a Yes and No condition/state.
// This appears in my "Pick City scene"
-(id) init
{
if ((self = [super init]))
{
NSLog(#"City list");
for (City *cityObj in listOfCities)
{
citySpriteOff = [CCSprite spriteWithSpriteFrameName:#"city.png"];
citySpriteOn = [CCSprite spriteWithSpriteFrameName:#"city_on.png"];
int x = [cityObj.x intValue];
int y = [cityObj.y intValue];
CCMenuItemSprite *mapMenuItem = [CCMenuItemSprite itemFromNormalSprite:citySpriteOff selectedSprite:citySpriteOn target:self selector:#selector(btnCity:)];
[mapMenuItem setTag:i];
[mapMenuItem setIsRelativeAnchorPoint:YES];
[mapMenuItem setAnchorPoint:CGPointMake(0, 0)];
[mapMenuItem setPosition:CGPointMake(x, y)];
[mapMenuItem setIsEnabled:YES];
[mapMenu addChild:mapMenuItem];
i++;
} // next
[self addChild:mapMenu z:2];
}
}
-(void) btnCity:(id)sender
{
NSLog(#"clicked a city button");
int tag = [sender tag];
City *cityObj = [listOfCities objectAtIndex:tag];
NSLog(#"You clicked on city: %#", cityObj.name);
[self lockLayers];
CCLayer *layer = [CCLayer node];
[self addChild:layer z:100];
[MapModalLayer ConfirmCity:cityObj onLayer:layer yesBlock:^{[self btnConfirmedCity:cityObj];} noBlock:^{[self unlockLayers];}];
}
-(void) btnConfirmedCity:(City *)cityObj
{
NSLog(#"confirmed city: %#", cityObj.name);
}
#pragma mark - Lock/Unlock layers
-(void) lockLayers
{
[self MenuStatus:NO Node:self];
}
-(void) unlockLayers
{
[self MenuStatus:YES Node:self];
}
// Disabled/Enable layers
-(void) MenuStatus:(BOOL)_enable Node:(id)_node
{
for (id result in ((CCNode *)_node).children) {
if ([result isKindOfClass:[CCMenu class]]) {
for (id result1 in ((CCMenu *)result).children) {
if ([result1 isKindOfClass:[CCMenuItem class]]) {
((CCMenuItem *)result1).isEnabled = _enable;
}
}
}
else
[self MenuStatus:_enable Node:result];
} // next
}
The actual modal code appears here,
#implementation MapModalLayer
- (id)init {
self = [super init];
if (self) {
// This method never seems to be called
NSLog(#"MapModalLayer init");
}
return self;
}
// This method never seems to be called
- (void) visit {
NSLog(#"Visit");
if (!self.visible)
return;
glPushMatrix();
glEnable(GL_SCISSOR_TEST);
glScissor(50, 50, 100 , 150);
[super visit];
glDisable(GL_SCISSOR_TEST);
glPopMatrix();
}
+ (void) CloseAlert: (CCSprite*) alertDialog onCoverLayer: (CCLayer*) coverLayer executingBlock: (void(^)())block {
// shrink dialog box
[alertDialog runAction:[CCScaleTo actionWithDuration:kAnimationTime scale:0]];
// in parallel, fadeout and remove cover layer and execute block
// (note: you can't use CCFadeOut since we don't start at opacity 1!)
[coverLayer runAction:[CCSequence actions:
[CCFadeTo actionWithDuration:0.2f opacity:0],
[CCCallBlock actionWithBlock:^{
[coverLayer removeFromParentAndCleanup:YES];
if (block) block();
}],
nil]];
}
+(void) ConfirmCity:(City *)cityObj onLayer:(CCLayer *)layer yesBlock :(void (^)())yesBlock noBlock:(void (^)())noBlock
{
CCLayerColor *coverLayer = [CoverLayer new];
[layer addChild:coverLayer z:INT_MAX]; // put to the very top to block application touches
[coverLayer runAction:[CCFadeTo actionWithDuration:kAnimationTime opacity:80]]; // smooth fade-in to dim with semi-transparency
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCSprite *dialog = [CCSprite spriteWithSpriteFrameName:#"modal.png"];
[dialog setPosition:CGPointMake(winSize.width/2,winSize.height/2)];
[dialog setTag:kDialogTag];
//
// We put our CCScrollLayer *scroller content here... it doesn't matter what it is right now
//
//
// Finally we put our accept/reject buttons
//
// Tick/Cross buttons
CCSprite *closeButtonOn = [CCSprite spriteWithSpriteFrameName:#"btn_close.png"];
CCSprite *tickButtonOn = [CCSprite spriteWithSpriteFrameName:#"btn_accept.png"];
// add one or two buttons, as needed
CCMenuItemSprite *opt1Button = [CCMenuItemSprite itemFromNormalSprite:closeButtonOn
selectedSprite:nil
block:^(id sender){
// close alert and call opt1block when first button is pressed
[self CloseAlert:dialog onCoverLayer: coverLayer executingBlock:noBlock];
} ];
[opt1Button setPosition:CGPointMake(-200, -120)];
// create second button, if requested
CCMenuItemSprite *opt2Button = [CCMenuItemSprite itemFromNormalSprite:tickButtonOn
selectedSprite:nil
block:^(id sender){
// close alert and call opt2block when second button is pressed
[self CloseAlert:dialog onCoverLayer: coverLayer executingBlock:yesBlock];
} ];
[opt2Button setPosition:CGPointMake(40, -120)];
CCMenu *menu = [CCMenu menuWithItems:opt1Button, opt2Button, nil];
[menu setContentSize:dialog.contentSize];
[dialog addChild:menu z:2];
[coverLayer addChild:dialog];
}
#end
I think its because I only ever use MapModalLayer's private methods only.
But I am not sure.
Is there a way to allow me to use the glScissor in a modal like explained above?
I've tried moving the glScissor code to the display of the modal, but it never seems to do anything.
To confirm it is working, I moved the glScissor code to the parent and it seems to work fine.
Thus, how do I make the modal layer use/work with glScissor?
I have since resolved this problem.
I used the Viewport from http://pastebin.com/tWsEbxvJ
The way I did it was:
CoverLayer *coverLayer = [CoverLayer new];
[layer addChild:coverLayer z:INT_MAX]; // put to the very top to block application touches
[coverLayer runAction:[CCFadeTo actionWithDuration:kAnimationTime opacity:80]]; // smooth fade-in to dim with semi-transparency
// ------------------------------
CGSize winSize = [[CCDirector sharedDirector] winSize];
CCSprite *dialog = [CCSprite spriteWithSpriteFrameName:#"modal.png"];
[dialog setPosition:CGPointMake(winSize.width/2,winSize.height/2)];
[dialog setTag:kDialogTag];
.. // Build your pagesArray here for ScrollLayer...
// Now create the scroller and pass-in the pages (set widthOffset to 0 for fullscreen pages)
CCScrollLayer *scroller = [[CCScrollLayer alloc] initWithLayers:pagesArray widthOffset: 350];
[scroller setShowPagesIndicator:NO];
// finally add the scroller to your scene
//[dialog addChild:scroller];
Viewport *cn = [[Viewport alloc] initWithRect:CGRectMake(3, 0, dialog.contentSize.width-12, dialog.contentSize.height-5)];
[cn addChild:scroller];
[scroller release];
[coverLayer addChild:dialog z:1];
This allows me to put a modal on a layer, put a CCScrollLayer and make sure that the contents do not spill over the internals of the modal sprite I have made (this is why the width configuration looks a bit odd).
Thanks.
How does one move the background image in a timer using cocos2d.
-(void) update:(ccTime)delta
What would be set in this method to move the background only on its y axis? I would like to scroll the map/background downwards as if the player is moving upwards.
I would like to then call this update method somehow every second or so.
-(void)update:(ccTime)delta
{
backgrd.position = ccp(backgrd.position.x,backgrd.position.y-10);
}
In your init:
-(id)init
{
self = [super init];
if(self)
{
//init your backgrd and stuff..
[self schedule:#selector(update:) interval: 1.0];
}
return self;
}