Using cocos2d, I'm trying to replace a sprite (item in my code) with a particle system. This code is placed in my board class. This one works:
// Draw the particles
CCParticleSystem *particles = [[CCParticleSystem alloc] initWithDictionary:_popParticles];
particles.position = ccpSub(item.position,ccp(160,160));
particles.autoRemoveOnFinish = TRUE;
[self addChild:particles];
This one doesn't:
// Draw the particles
CCParticleSystem *particles = [[CCParticleSystem alloc] initWithDictionary:_popParticles];
particles.position = item.position;
particles.autoRemoveOnFinish = TRUE;
[self addChild:particles];
I tried player with this but without success:
particles.positionType = CCPositionTypeMake(CCPositionUnitUIPoints, CCPositionUnitUIPoints, CCPositionReferenceCornerBottomLeft);
My board is a 320x320 points CCSprite with anchor point set at 0.5, 0.5
When I log my item.position value, I get something relative to the bottom left corner of my board (from 30,30 to 290,290)
Is using ccpSub the correct way ?
When you destroy a node you also destroy all of it's children nodes, you said you add your particle to 'item' then you destroy that 'item', which means you have no particle anymore.
Related
I am having an issue in Kobold2d-Cocos2d regarding the layering of CCSprite objects.
All of my code works fine, except that a certain tile (a CCSprite), held in an array, is supposed to always be on top. The code has an array of references to CCSprites (Tile) and goes along all the tiles swapping them with each other. So element 0 and 1 switch (in the array and on screen using a moveTo), then the new element 1 and 2 switch, then the new element 2 and 3 switch etc...
The idea is the Tile at the start of the chain leapfrogs to the front of the line!
I always want that first tile to stay on top, but it isn't. It only does sometimes (when it's above the other Tile it's switching places with on the screen, implying it was added later)
Here's the CCScene code in question:
//reference first CCSprite in array -works
Tile *firstTile = [tileArray objectAtIndex:(int)[[[selTracker oldSelectionArray] objectAtIndex:0]element]];
//How much time should be spend leapfrogging each two tiles broken up over 1 second.
float intervalTime = .75/(float)[[selTracker oldSelectionArray] count];
//Will use this to count each tile set we leapfrog
float currentPass = 0;
//TODO: destroy this wrapper class that holds number, use NSNumber. Fine for now.
SimpCoord *lastCord;
//Make moving sprite higher than all others. DOESN'T WORK?
[self reorderChild:firstTile z:100];
//Loop through all the tiles that were selected
for (SimpCoord *coord in [selTracker oldSelectionArray])
{
if (lastCord)
{
//Queue each tile to leapfrog with our moving tile
if ([self respondsToSelector:#selector(switchTilesFuncWrapper:)])
{
NSArray *argArray = [NSArray arrayWithObjects:
[NSNumber numberWithInt:[lastCord element]],
[NSNumber numberWithInt:[coord element]],
[NSNumber numberWithFloat:(intervalTime)], nil];
[self performSelector:#selector(switchTilesFuncWrapper:) withObject:argArray afterDelay:((currentPass) * intervalTime)];
}
currentPass++;
}
lastCord = coord;
}
`
That calls the following code by the way that actually swaps the two Tiles (I excluded the function wrapper middleman I needed for multiple arguments):
(In case it makes it easier to understand, rather than use a 2d array to hold all my tiles I just only draw 10 per line, hence the tileCoordsByElement method - but that shouldn't be important)
//
// Switch two tiles on the screen and in the holder array
// onlySwitchArray pass in true to only swap tiles in organization array
// but provide no animation.
- (void) switchTiles:(NSNumber*)elePosVal secPos:(NSNumber*)elePos2Val timeToSwitch:(NSNumber*)time
{
float switchTime = [time floatValue];
int elePos = [elePosVal intValue];
int elePos2 = [elePos2Val intValue];
Tile *tmpTile = [tileArray objectAtIndex:elePos];
Tile *tmpTile2 = [tileArray objectAtIndex:elePos2];
//Move actual tiles on screen
//Move Tile is elePos (1) to elePos2
int curCol = 0;
int curRow = 0;
[self tileCoordsByElement:elePos2 x:&curRow y:&curCol];
CCSequence *tmpTile1_Seq = [CCSequence actions:
[CCMoveTo actionWithDuration:switchTime position:ccp((curRow-1)*tmpTile.width + tmpTile.width/2,
(curCol-1)*tmpTile.height + tmpTile.height/2)], nil];
[tmpTile runAction:[CCRepeat actionWithAction:tmpTile1_Seq times:1]];
//Move Tile that is elePos2 to elePos(1)
[self tileCoordsByElement:elePos x:&curRow y:&curCol];
CCSequence *tmpTile1_Seq2 = [CCSequence actions:
[CCMoveTo actionWithDuration:switchTime position:ccp((curRow-1)*tmpTile.width + tmpTile.width/2,
(curCol-1)*tmpTile.height + tmpTile.height/2)], nil];
[tmpTile2 runAction:[CCRepeat actionWithAction:tmpTile1_Seq2 times:1]];
//Swap tiles in array second
[tileArray replaceObjectAtIndex:elePos withObject:tmpTile2];
[tileArray replaceObjectAtIndex:elePos2 withObject:tmpTile];
}
Alright.
I'm aware some things I'm doing aren't exactly efficient and if it's not relevant I don't really want to focus to heavily on them. This is just a learning exercise for me - I just honestly don't understand why the origional Tile won't stay on top.
I've tried every resource or example I possibly can find for answers (sample included code, tutorials online, terrible book I bought, random somewhat related stackoverflow articles) and I'm getting nothing :\
In case it matters this is how I origionally added my sprites to the scene:
//Set up A CCSpriteBatchNode to load in pList/pngs of images
[[CCSpriteFrameCache sharedSpriteFrameCache]
addSpriteFramesWithFile:#"zAtl_BasicImages_64.plist"];
nodeBasicImages = [CCSpriteBatchNode batchNodeWithFile:#"zAtl_BasicImages_64.png" capacity:100];
//Initialize array used to track tiles in scene
tileArray = [[NSMutableArray alloc] init];
for (int i = 0; i<100; i++)
{
Tile *tmpTile = [[Tile alloc] init];
[tileArray addObject:tmpTile];
[self reorderChild:tmpTile z:-1];
}
Note: I checked and the zOrder on both Tiles is correct on the line before the MoveTo animation begins.
I added my sprites not to my layer, but to an image node because I was using a Sprite Atlas. So I was trying to access sprites that weren't even there. - I'm a new user so going to have to wait 8 hours until I can close. Peace. Why it didn't throw an error I'll never know.
I've got to sprites, essentially a nucleus (parent) and an electron (child). I'm trying to find a way to have the electron orbit the nucleus. I've found a few posts here and there on moving anchor points, but that is apparently related to the texture of the sprite, not the sprite itself.
This is my current init method for my parent sprite:
self = [super init];
if (self) {
CCSprite *orbitAnchor = [CCSprite new];
[self addChild:orbitAnchor];
orbitAnchor.position = ccp(32,32);
CCSprite *orbiter = [CCSprite spriteWithFile:#"line.png" rect:CGRectMake(0, 0, 8, 8)];
[orbitAnchor addChild:orbiter];
orbiter.position = ccp(40,40);
CCAction *orbitAction = [CCRepeatForever actionWithAction:[CCRotateTo actionWithDuration:1 angle:720]];
[orbitAnchor runAction:orbitAction];
[self initAnimations];
}
return self;
Those numbers are all totally arbitrary though - I just stuck them in there and got what looked best. I'm sure there's a more programatic way to do what I want.
Basically, I'm looking for a way to set the child's axis point at the center of the parent, and then have it rotate around that point. It seems like a relatively simple thing to do using CCRotate and such, but I think I'm missing what to search for in order to move the anchor point of the child. Any suggestions/other posts?
Thanks
You have [CCSprite new] which is an unusual use, probably not supported. Unless the orbit anchor node should display a texture, you can just use a CCNode as anchor.
Technically you're doing everything correct from what I can see. You might want to try without the rotate actions and instead change the direction manually in a scheduled update method.
CCNode *orbitAnchor = [CCNode node];
[self addChild:orbitAnchor z:0 tag:1];
orbitAnchor.position = ccp(32,32);
CCSprite *orbiter = [CCSprite spriteWithFile:#"line.png" rect:CGRectMake(0, 0, 8, 8)];
[orbitAnchor addChild:orbiter z:0 tag:2];
orbiter.position = ccp(40,40);
[self scheduleUpdate];
Update method:
-(void) update:(ccTime)delta
{
CCNode* orbitAnchor = [self getChildByTag:1];
orbitAnchor.direction += 5;
}
From the image filename it looks like you're trying to draw a line from the orbitAnchor to the orbiter. You can do that with ccDrawLine:
-(void) draw
{
CCNode* orbitAnchor = [self getChildByTag:1];
CCNode* orbiter = [self getChildByTag:2];
ccDrawLine(orbitAnchor.position, orbiter.position);
}
Anchor points. Automatically, objects are placed based on the center of an object right? with anchor points you can move that around, so if you rotate the object it will rotate around the anchorpoint. http://www.qcmat.com/understanding-anchorpoint-in-cocos2d/
I've not been able to find this in the docs.
I've got a CC3Node (myNode) and my layer has the callbacks for touchDown & touchMoved events all of which works, so far. I'm trying to drag myNode around the screen, preferably using screen coordinates.
How do I set myNode's location relative to screen (layer) coordinates?
Ok, I finally tracked this down, although the pieces were a bit scattered around in multiple posts. My final solution looked something like this:
MyWorld.m:
// Error checking and misc removed
- (void) addBackgroundForProjection
{
// background plane supports touch events
background = [CC3PlaneNode nodeWithName: BACKGROUND_PROJECTION_PLANE_NAME];
[background populateAsCenteredRectangleWithSize: CGSizeMake(10.0, 10.0)
withTexture: [CC3Texture textureFromFile: #"transparent1x1.png"]
invertTexture: YES];
[background setIsOpaque: NO];
[background retainVertexLocations];
[background setLocation: cc3v(0, 0, 0.001)];
[self addChild: background];
}
// ...
- (void) moveNode: (CC3Node*) node toScreenLocation: (CGPoint) point
{
// update node on screen
CC3Plane groundPlane = self.background.plane;
CC3Vector4 touchLoc = [self.activeCamera unprojectPoint: point ontoPlane: groundPlane];
CC3Vector newLoc = cc3v(touchLoc.x,touchLoc.y,touchLoc.z);
[node setLocation: newLoc];
}
I think I'm just understanding scaling/positioning nodes/layers incorrectly. I'm setting up my node like this (node class is derived from CCNode):
-(id) init
{
if ((self = [super init]))
{
// Create parallax background node.
background = [BackgroundNode node];
[self addChild:background z:0];
// Create foreground node.
foreground = [ForegroundLayer node];
[self addChild:foreground z:0];
self.position.y = 500.0f;
self.scaleX = 1.5f;
self.scaleY = 1.5f;
}
return self;
}
It doesn't seem to matter what I set the self.position.y to - the scaled node is always displayed as though it was positioned in the bottom-left of the screen. I've tried playing around with anchorPoint as well, but it doesn't really seem to change anything.
The reason I'm asking is because I'd like to be able to pan vertically when I'm zoomed in - this doesn't seem to really be the right way to accomplish it, though. Any ideas?
self.position.y = 500.0f;
doesn't work. It should be
self.position = ccp(self.position.x, 500.0f);
Please refer to "Cocoa Objective-c Property C structure assign fails".
I have one question when infinite background scrolling is done, is the object remain fixed(like doodle in doodle jump, papy in papi jump) or these object really moves.Is only background move or both (background and object )move.plz someone help me.I am searching for this solution for 4/5 days,but can't get the solution.So plz someone help me. And if object does not move how to create such a illusion of object moving.
If you add the object to the same layer as the scrolling background, then it will scroll as the background scrolls.
If your looking for an effect like the hero in doodle jump, you may want to look at having two or more layers in a scene.
Layer 1: Scrolling Background Layer
Layer 2: Sprite layer
SomeScene.m
CCLayer *backgroundLayer = [[CCLayer alloc] init];
CCLayer *spriteLayer= [[CCLayer alloc] init];
[self addChild:backgroundLayer z:0];
[self addChild:spriteLayer z:1];
//Hero stays in one spot regardless of background scrolling.
CCSprite *squidHero = [[CCSprite alloc] initWithFile:#"squid.png"];
[spriteLayer addChild:squidHero];
If you want objects to scroll with the background add it to the background layer:
//Platform moves with background.
CCSprite *bouncePlatform= [[CCSprite alloc] initWithFile:#"bouncePlatform.png"];
[backgroundLayer addChild:bouncePlatform];
Another alternative is to use a CCFollow action. You would code as if the background is static (which it will be) and the player is moving (which it will be), but add a CCFollow action to the player. This essentially moves the camera so that it tracks your player.
You can also modify the classes so that you can get the CCFollow action to follow with an offset (i.e., so the player is not in the middle of the screen) as well as to have a smoothing effect to it, so that when the player moves, the follow action is not jerky. See the below code:
*NOTE I am using cocos2d-x, the c++ port. The methods are similar in cocos2d, and you should be able to modify these to fit the cocos2d syntax. Or search around -- I found these for cocos2d and then ported to c++.
//defines the action to constantly follow the player (in my case, "runner.p_sprite is the sprite pointing to the player)
FollowWithOffset* followAction = FollowWithOffset::create(runner.p_sprite, CCRectZero);
runAction(followAction);
And separately, I have copied the class definition for CCFollow to create my own class, CCFollowWithAction. This also has a smoothing effect (you can look this up more online) so that when the player moves, the actions are not jerky. I modified "initWithTarget," to take into account an offset, and "step," to add a smoothing action. You can see the modifications in the comments below.
bool FollowWithOffset::initWithTarget(CCNode *pFollowedNode, const CCRect& rect/* = CCRectZero*/)
{
CCAssert(pFollowedNode != NULL, "");
pFollowedNode->retain();
m_pobFollowedNode = pFollowedNode;
if (rect.equals(CCRectZero))
{
m_bBoundarySet = false;
}
else
{
m_bBoundarySet = true;
}
m_bBoundaryFullyCovered = false;
CCSize winSize = CCDirector::sharedDirector()->getWinSize();
m_obFullScreenSize = CCPointMake(winSize.width, winSize.height);
//m_obHalfScreenSize = ccpMult(m_obFullScreenSize, 0.5f);
m_obHalfScreenSize = CCPointMake(m_obFullScreenSize.x/2 + RUNNER_FOLLOW_OFFSET_X,
m_obFullScreenSize.y/2 + RUNNER_FOLLOW_OFFSET_Y);
if (m_bBoundarySet)
{
m_fLeftBoundary = -((rect.origin.x+rect.size.width) - m_obFullScreenSize.x);
m_fRightBoundary = -rect.origin.x ;
m_fTopBoundary = -rect.origin.y;
m_fBottomBoundary = -((rect.origin.y+rect.size.height) - m_obFullScreenSize.y);
if(m_fRightBoundary < m_fLeftBoundary)
{
// screen width is larger than world's boundary width
//set both in the middle of the world
m_fRightBoundary = m_fLeftBoundary = (m_fLeftBoundary + m_fRightBoundary) / 2;
}
if(m_fTopBoundary < m_fBottomBoundary)
{
// screen width is larger than world's boundary width
//set both in the middle of the world
m_fTopBoundary = m_fBottomBoundary = (m_fTopBoundary + m_fBottomBoundary) / 2;
}
if( (m_fTopBoundary == m_fBottomBoundary) && (m_fLeftBoundary == m_fRightBoundary) )
{
m_bBoundaryFullyCovered = true;
}
}
return true;
}
void FollowWithOffset::step(float dt)
{
CC_UNUSED_PARAM(dt);
if(m_bBoundarySet){
// whole map fits inside a single screen, no need to modify the position - unless map boundaries are increased
if(m_bBoundaryFullyCovered)
return;
CCPoint tempPos = ccpSub( m_obHalfScreenSize, m_pobFollowedNode->getPosition());
m_pTarget->setPosition(ccp(clampf(tempPos.x, m_fLeftBoundary, m_fRightBoundary),
clampf(tempPos.y, m_fBottomBoundary, m_fTopBoundary)));
}
else{
//custom written code to add in support for a smooth ccfollow action
CCPoint tempPos = ccpSub( m_obHalfScreenSize, m_pobFollowedNode->getPosition());
CCPoint moveVect = ccpMult(ccpSub(tempPos,m_pTarget->getPosition()),0.25); //0.25 is the smooth constant.
CCPoint newPos = ccpAdd(m_pTarget->getPosition(), moveVect);
m_pTarget->setPosition(newPos);
}
}