cocos2d for iPhone » Tag: chipmunk

cocos2d for iPhone » Tag: chipmunk - Recent Posts http://www.cocos2d-iphone.org/forum/tags/chipmunk A fast, easy to use, free, and community supported 2D game engine en-US Sat, 31 Jul 2010 07:35:12 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://www.cocos2d-iphone.org/forum/search.php max9xs on "Chipmunk Logo Smash effect...how to create bitmap image ?" http://www.cocos2d-iphone.org/forum/topic/7833#post-48515 Sat, 31 Jul 2010 07:19:33 +0000 max9xs 48515@http://www.cocos2d-iphone.org/forum/ Any links,, or names ? I found nothing till now.. confused totally... mobilebros on "Chipmunk collision offset?" http://www.cocos2d-iphone.org/forum/topic/8165#post-48100 Wed, 28 Jul 2010 05:08:30 +0000 mobilebros 48100@http://www.cocos2d-iphone.org/forum/ A chipmunk rect produced by SpaceManager is also created "outward" from the position of the node (default is center), so usually things line up, if you can tell that there is some offset tho, you can use the spacemanager function: <pre><code>-(void) offsetShape:(cpShape*)shape offset:(cpVect)offset;</code></pre> That will offset the shape from the center by whatever point you pass it. Jack Here on "Chipmunk collision offset?" http://www.cocos2d-iphone.org/forum/topic/8165#post-48074 Wed, 28 Jul 2010 00:45:14 +0000 Jack Here 48074@http://www.cocos2d-iphone.org/forum/ Ok I added a cpShapeNode to see what is going on. I think the problem is each collision_tile is being drawn from the center point of the tile from the tilegid. So then the collision_tile looks like it is sitting down and to the left. Anyway to change this? Jack Here on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47959 Tue, 27 Jul 2010 03:23:07 +0000 Jack Here 47959@http://www.cocos2d-iphone.org/forum/ oh sweet! thanks a lot, that was becoming a big headache. mobilebros on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47954 Tue, 27 Jul 2010 03:04:32 +0000 mobilebros 47954@http://www.cocos2d-iphone.org/forum/ Wow ok that was trickier than I thought, I'll try to explain. cpCCSprite does not actually override initWithFile (it actually probably should, so thank you for that). Since it does not it does not initialize things properly. Sooo to get your class to work I had to do this: <pre><code>#<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "Hero.h" @implementation Hero + (id)hero { NSLog(@"inside hero class method"); return [[self alloc] initHero]; } - (id) initHero { self = [super initWithFile:@"gear.png"]; if(self != nil) { cpBody *body = cpBodyNew(250.0f, INFINITY); body->p = cpv(250, 160); cpShape *shape = cpCircleShapeNew(body, 29.0f, cpvzero); CPCCNODE_MEM_VARS_INIT(shape) shape->e = 0.8; shape->u = 0.7; shape->collision_type = 2; } return self; } @end</code></pre> Basically I create the shape separately but then hand it off to that handy macro that will expand and properly initialize everything, it will automatically add self to shape->data so I removed your line that did so. I did a quick test and everything checks out, good luck. Jack Here on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47951 Tue, 27 Jul 2010 02:33:41 +0000 Jack Here 47951@http://www.cocos2d-iphone.org/forum/ This is the h file: <pre><code>#<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> <Foundation/Foundation.h> #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "cocos2d.h" #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "SpaceManager.h" #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "chipmunk.h" #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "cpCCSprite.h" #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "cpBody.h" #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "cpShape.h" #<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "cpShapeNode.h" @interface Hero: cpCCSprite { } +(id)hero; -(id)initHero; @end</code></pre> and the m file: <pre><code>#<a href='http://www.cocos2d-iphone.org/forum/tags/import'>import</a> "Hero.h" @implementation Hero + (id)hero { NSLog(@"inside hero class method"); return [[self alloc] initHero]; } - (id) initHero { self = [super initWithFile:@"ball.png"]; if(self != nil) { cpBody *body = cpBodyNew(250.0f, INFINITY); body->p = cpv(250, 160); self.shape = cpCircleShapeNew(body, 29.0f, cpvzero); self.shape->data = self; self.shape->e = 0.8; self.shape->u = 0.7; self.shape->collision_type = 2; } return self; } @end</code></pre> and then Im using it in my gamelayer with this: <pre><code>ball = [Hero hero]; [smgr addShape:ball.shape]; [self addChild:ball];</code></pre> ship is cpCCSprite *ball; in header. mobilebros on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47941 Tue, 27 Jul 2010 01:00:32 +0000 mobilebros 47941@http://www.cocos2d-iphone.org/forum/ hmmm i'm not sure what the issue is, I'd have to see both your files; theoretically what you're doing should be ok.... of course if the CCSprite version works for you thats fine too. <a href="mailto:support@mobile-bros.com">support@mobile-bros.com</a> if you want to share your files, or I guess even post them here... Jack Here on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47880 Mon, 26 Jul 2010 18:25:10 +0000 Jack Here 47880@http://www.cocos2d-iphone.org/forum/ when i do this with ccCCSprite it crashes, but if i do it with CCSprite it works. <pre><code>@interface Hero: CCSprite { } +(id)hero; -(id)initHero; @end @implementation Hero + (id)hero { NSLog(@"inside hero class method"); return [[self alloc] initHero]; } - (id) initHero { self = [super initWithFile:@"ball.png"]; if(self != nil) { /* cpBody *body = cpBodyNew(250.0f, INFINITY); body->p = self.position; self.shape = cpCircleShapeNew(body, 29.0f, cpvzero); self.shape->data = self; self.shape->e = 0.8; self.shape->u = 0.7; self.shape->collision_type = 2; */ } return self; } @end</code></pre> works...but <pre><code>@interface Hero: CCSprite {....</code></pre> does not, is this not allowed with ccCCSprite? mobilebros on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47760 Sun, 25 Jul 2010 21:17:47 +0000 mobilebros 47760@http://www.cocos2d-iphone.org/forum/ Haha no problem, and actually we're in the U.S., New Hampshire to be precise, but I appreciate the offer :) That rotation inwards still sounds like a side effect of the gear I think... mobilebros on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47759 Sun, 25 Jul 2010 21:15:38 +0000 mobilebros 47759@http://www.cocos2d-iphone.org/forum/ If hero is a sub-class of cpCCSprite you already have a "shape" property, no sense in defining another one; access it with "self.shape". The second problem is that you're not adding it to the space, if using SpaceManager try: <pre><code>ball = [Hero hero]; //This line is neeeded [smgr addShape:hero.shape]; [self addChild:ball];</code></pre> paule on "Chipmunk: How to remove shape and body?" http://www.cocos2d-iphone.org/forum/topic/8190#post-47747 Sun, 25 Jul 2010 18:32:26 +0000 paule 47747@http://www.cocos2d-iphone.org/forum/ I can't help you with the touch detection problem. I think there was a method to check if there is a body at that (converted) position but I don't remember how, sorry. If you have scheduled <code>cpSpaceStep()</code> you should use SpaceManager and the function <code>cpSpaceAddPostStepCallback()</code>. This snippet shows how to remove shape (shape) and body (shape->body) from the space (space): <pre><code>cpSpaceRemoveBody(space, shape->body); cpSpaceRemoveShape(space, shape); cpBodyFree(shape->body); cpShapeFree(shape);</code></pre> Be sure to use it with the above explained function otherwise you might get the error 'EXC_BAD_ACCESS'. paule on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47745 Sun, 25 Jul 2010 18:26:00 +0000 paule 47745@http://www.cocos2d-iphone.org/forum/ I can't assess it. I used the way to create them without SpaceManager. There's a nice a tutorial which may will help: <a href="http://www.alexandre-gomes.com/articles/chipmunk/">http://www.alexandre-gomes.com/articles/chipmunk/</a> Jack Here on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47740 Sun, 25 Jul 2010 17:11:26 +0000 Jack Here 47740@http://www.cocos2d-iphone.org/forum/ Now this code is crashing on me, so I cant even check. Maybe this is not the best way to do create this? paule on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47710 Sun, 25 Jul 2010 12:53:21 +0000 paule 47710@http://www.cocos2d-iphone.org/forum/ Do you checked if cpSpace contains the ball? Does cpSpace get updated? Xenetrix on "Chipmunk: How to remove shape and body?" http://www.cocos2d-iphone.org/forum/topic/8190#post-47661 Sun, 25 Jul 2010 07:06:21 +0000 Xenetrix 47661@http://www.cocos2d-iphone.org/forum/ First, sorry for my English, im not an American. My question is how can I remove the shape and body from the space, this isn't related with collision detection. Im triying to do this with a touch event, specifically I'm trying to clear a ball Touching it (I have a lot of balls in the space), but I have no idea how to do it, I have been looking on Internet and cannot find any help regarding how to do it, all relates to the collisions and that's not what I need. Jack Here on "How to make a hero class for chipmunk?" http://www.cocos2d-iphone.org/forum/topic/8189#post-47658 Sun, 25 Jul 2010 06:14:42 +0000 Jack Here 47658@http://www.cocos2d-iphone.org/forum/ Im trying to make a hero class for chipmunk. So far I have this in my header: <pre><code>@interface Hero: cpCCSprite { cpShape *shape; cpSpace *space; } +(id)hero; -(id)initHero;</code></pre> and this in my m file: <pre><code>@implementation Hero + (id)hero { NSLog(@"inside hero class method"); return [[self alloc] initHero]; } - (id) initHero { self = [super initWithFile:@"ball.png"]; if(self != nil) { cpBody *body = cpBodyNew(250.0f, INFINITY); body->p = self.position; shape = cpCircleShapeNew(body, 29.0f, cpvzero); shape->data = self; shape->e = 0.8; shape->u = 0.7; shape->collision_type = 2; } return self; }</code></pre> then i init it in my gamescreen with: <pre><code>ball = [Hero hero]; [self addChild:ball];</code></pre> However, it does not react in the gamescreen...it should fall to the bottom. How do I get my hero class to react to the spacemanager? mrTortex on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47600 Sat, 24 Jul 2010 17:44:45 +0000 mrTortex 47600@http://www.cocos2d-iphone.org/forum/ :) Of course. You based in the UK? I think I owe you a beer. One odd thing I noted, the legs don't rotate outwards when they receive the weight of the body above them, they rotate inwards and push the body upwards! Some odd stuff going on again. Gotta love physics, they make everything so much more confusing. :) Now back to figuring out my parallax issue... Thanks again. mobilebros on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47593 Sat, 24 Jul 2010 16:31:52 +0000 mobilebros 47593@http://www.cocos2d-iphone.org/forum/ You're on the right track its phase you want to play with; make sure it's in radians... mrTortex on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47564 Sat, 24 Jul 2010 08:08:03 +0000 mrTortex 47564@http://www.cocos2d-iphone.org/forum/ Hello. Thanks for the code. It turned out the way I was dealing with impulses and moving the main body around was causing odd things to occur, so I re-wrote that section and it's now working. :) However, my legs need to point out at 45 degrees, which they do to start with, but the gear brings them into alignment with the body. Is there a rotational offset available? I've tried using phase but it rotates around itself constantly, which looks kinda cool but isn't the desired effect! :) Thanks. mobilebros on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47549 Sat, 24 Jul 2010 02:25:30 +0000 mobilebros 47549@http://www.cocos2d-iphone.org/forum/ <pre><code>CGPoint pt = [wherever you want it]; _torso = [smgr addRectAt:ccpAdd(pt,ccp(0,8)) mass:12 width:12 height:24 rotation:0]; _lleg = [smgr addRectAt:ccpAdd(pt,ccp(-6,-23)) mass:4 width:4 height:26 rotation:CC_DEGREES_TO_RADIANS(-5)]; _rleg = [smgr addRectAt:ccpAdd(pt,ccp(6,-23)) mass:4 width:4 height:26 rotation:CC_DEGREES_TO_RADIANS(5)]; [smgr addPivotToBody:_torso->body fromBody:_lleg->body worldAnchor:cpvadd(pt, cpv(-5, -6))]; [smgr addPivotToBody:_torso->body fromBody:_rleg->body worldAnchor:cpvadd(pt, cpv(5, -6))]; cpConstraint *gear = [smgr addGearToBody:_torso->body fromBody:_lleg->body ratio:1]; gear->maxForce = 3000; gear = [smgr addGearToBody:_torso->body fromBody:_rleg->body ratio:1]; gear->maxForce = 3000;</code></pre> That's literally what I do to create a rectangular torso with 2 stiff straight rectangle legs. mrTortex on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47525 Fri, 23 Jul 2010 20:44:47 +0000 mrTortex 47525@http://www.cocos2d-iphone.org/forum/ Hello. I created a constraint between the body and leg, I'm getting very odd results. Would you mind posting a code snippet? Understand if not, Would it possibly be anything to do with applying impulses to the body which cause it to rotate? mobilebros on "Chipmunk collision offset?" http://www.cocos2d-iphone.org/forum/topic/8165#post-47520 Fri, 23 Jul 2010 20:07:25 +0000 mobilebros 47520@http://www.cocos2d-iphone.org/forum/ There shouldn't be any weird offset, perhaps [collision positionAt:ccp(x,y)] is returning the wrong position? Maybe attach a cpShapeNode to that cpShape for the tile just for debugging purposes to see if its the right position? mobilebros on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47517 Fri, 23 Jul 2010 19:57:08 +0000 mobilebros 47517@http://www.cocos2d-iphone.org/forum/ You need a pin/pivot for sure, I used a pivot. I just checked my code and I have 1 for the ratio and maxForce = 3000. The overall effect looks pretty good I'd say, legs are somewhat "springy" like they should be. [Edit] Reading your first post again, I'd think the rotary springs would work too, did you connect the contraint between the body and leg or between the leg and some other object? Jack Here on "Chipmunk collision offset?" http://www.cocos2d-iphone.org/forum/topic/8165#post-47514 Fri, 23 Jul 2010 19:41:34 +0000 Jack Here 47514@http://www.cocos2d-iphone.org/forum/ Hello, I have a character that is 32 by 50. And I have tiles that are 32 by 32. I am creating the character like so: <pre><code>cpShape *square = [smgr addRectAt:cpv(240,160) mass: 3.0 width:32 height:50 rotation:0]; character = [cpCCSprite spriteWithShape:square file:@"character_.png"]; cpCCSprite *character; //in header</code></pre> Then after loading my tilemap I do this: <pre><code>for(int x = 0; x < [collision layerSize].width; x++) { for(int y = 0; y < [collision layerSize].height; y++) { unsigned int tmpgid = [collision tileGIDAt:ccp(x,y)]; if(tmpgid == 34) { cpShape *collision_tile = [sm addRectAt:[collision positionAt:ccp(x,y)] mass:STATIC_MASS width:32 height:32 rotation:0]; //NSLog(@"gid: %i",tmpgid); //NSLog(@"x: %f, y: %f ",tmp.x, tmp.y); } } }</code></pre> To add a cpShape that acts as a collidable object (ground or wall). The problem is the my character seems to sit below the ground or stops before he hits a wall. I was wondering if chipmunk needs some sort of offet to correct this problem? mrTortex on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47502 Fri, 23 Jul 2010 18:02:14 +0000 mrTortex 47502@http://www.cocos2d-iphone.org/forum/ With a gear do you also need a pin, or pivot? The reason I ask is with a gear alone it flies off. Also, it doesn't rotate with the main body. mobilebros on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47498 Fri, 23 Jul 2010 17:32:42 +0000 mobilebros 47498@http://www.cocos2d-iphone.org/forum/ Use a gear constraint between the leg and body, set the gear constraint maxForce to something like 3000, maybe lower. mrTortex on "Chipmunk/Spacemanager constraints." http://www.cocos2d-iphone.org/forum/topic/8161#post-47497 Fri, 23 Jul 2010 17:17:40 +0000 mrTortex 47497@http://www.cocos2d-iphone.org/forum/ Hello. Me again! I'll go away soon ;) I want to have a ball with two little legs sticking out of it. The ball should fall, land on it's legs, which rotate with the impact, then spring to a settled position. So, I have my ball body, two leg bodies, two pin constraints and two rotation spring constraints. Should work yes? Well, it doesn't because the legs don't rotate with the body, so if the body is upside down, the legs are still pointing at the floor. I need a way to have the child bodies inherit the rotation from the parent. Any ideas? Thanks. mrTortex on "Knowing where to position constraints." http://www.cocos2d-iphone.org/forum/topic/8159#post-47484 Fri, 23 Jul 2010 16:17:48 +0000 mrTortex 47484@http://www.cocos2d-iphone.org/forum/ Hello. I'm having a hard time figuring out where to place Chipmunk constraints. Is it based on the local or screen space of the shape? For example: <img alt="" /> To pin the stick to the circle, is the stick the to or the from body? Would I give the sticks local x and y coords or it's current position in screen space to position the stick? If the stick is 80 pixels long and 10 high for example, and I wanted it pinned like above would I give x as 5 and y as 5 (roughly)? Because, if I do, the stick isn't pinned as shown above. I've read the docs and checked the example, but just can't get this working. I want to pin the stick and have it rotate only a specific amount, for which I was going to use a rotate limit. Any help would be great, thanks. mobilebros on "How do you change the window size with SpaceManager?" http://www.cocos2d-iphone.org/forum/topic/8158#post-47478 Fri, 23 Jul 2010 15:33:40 +0000 mobilebros 47478@http://www.cocos2d-iphone.org/forum/ Well if its just a matter of "padding" you can specify horiz. and vert. padding with the inset parameter. If its a question of width and height you can use this alternate function: <pre><code>-(void) addWindowContainmentWithFriction:(cpFloat)friction elasticity:(cpFloat)elasticity size:(CGSize)wins inset:(cpVect)inset radius:(cpFloat)radius</code></pre> Sadly this still assumes you're starting at point 0,0 I'm thinking that maybe there should be another method now that takes a CGRect so you can actually specify the containment rect directly..... hmmm hope that helps. Jack Here on "How do you change the window size with SpaceManager?" http://www.cocos2d-iphone.org/forum/topic/8158#post-47475 Fri, 23 Jul 2010 15:05:06 +0000 Jack Here 47475@http://www.cocos2d-iphone.org/forum/ Im using chipmunk and spacemanager. I was wondering how you change the the window containment size? I have a tile map and want the containment size to be the same as the tilemap. I know how to get the tilemap size but not sure how to manipulate the containment size. Any suggestions?