Tagged Questions
-1
votes
0answers
22 views
Applying the vector of a swipe movement to a box2d object
Hi I'm trying to achieve game functionality where the player can place their finger on an object then swipe in a certain direction and apply the speed and velocity of the swipe to the object they have ...
-1
votes
0answers
31 views
How to make askew slope image(b2body) in Box2d?
I am new in Box2d and learning myself. I am learning Box2d from here http://www.box2d.org/manual.html#_Toc258082972
I want to make a body and want to give b2body a angle so that it will look like ...
0
votes
0answers
35 views
Catching an object from sky in Cocos2d and Box2d world
My world has a gravity of -9.8 and there are KDynamicBodyType bodies falling from the sky. At the bottom there is a PhysicsSprite with KinematicBodyType. I want the PhysicsSprite to be able to catch ...
0
votes
0answers
72 views
Help with ball movement and rotation in Box2d [closed]
I am trying to learn box2d in cocos2d. I have searched for online tutorials and ray Wenderlich's seem to be the best ones!I am learning in a slow but steady pace! I am currently developing an app in ...
0
votes
0answers
44 views
GetReactionForce().y does not show 0 even it has no weight
I have built a simple structure with static and dynamic bodies and revolute joints. None of the bodies have weight, I've set the density to 0. Here's the structure:
In screen update method I do ...
3
votes
1answer
105 views
Collision Filtering in Box2D
I have four bodies in my Box2D World. Each are polygon shape, with some physics parameters.
Now when the game start, I need one of the bodies from the World (BodyA) to not be allowed to collide with ...
2
votes
1answer
404 views
Directional Lights
I'm working on a game idea (2D) that needs directional lights. Basically I want to add light sources that can be moved and the light rays interact with the other bodies on the scene.
What I'm doing ...
0
votes
1answer
120 views
Creating multiple fixtures in one body
I want to create this type of fixture in one body. Here square and circle both are different fixtures but attach to one body. How do I do this?
1
vote
2answers
177 views
Confusing box2d forces
Hello Friends.
This is my demo game screen-shoot. Here i am using three buttons. Right-bottom button is used for jump and left-bottom buttons used for move left and right.
I have some questions
1) ...
1
vote
0answers
567 views
How to properly add texture to multi-fixture/shape b2Body
Hello to everyone this is my first poste here I hope that will be not fail start.
At start I must say I make part 1 in Ray's Tutorial "How To Make A Game Like Fruit Ninja With Box2D and Cocos2D". But ...
1
vote
1answer
97 views
Sprite Body can not stop
Hey i have issue regarding jump sprite body. In my code i am using moveLeft and moveRight Button and when i am press moveRight Button using following code
if (moveRight.active==YES)
{
...
0
votes
1answer
250 views
moving box2d bodies in an arc or curved path
How can I make a b2Body move in a arc-like or curved path? I have heard about cocos2d Bezier curve function (ccBezier) but this is for moving cocos2d sprites. Or can it be modified to move box2d ...
0
votes
1answer
304 views
EXC_BAD_ACCESS error when box2d joint is destroyed
When I destroy the weldJoint in the update method (see below) I get an EXC_BAD_ACCESS error pointing to the line
world->DestroyJoint(weldJoint);
in the update method below:
-(void) update: ...
0
votes
0answers
103 views
How to create move button for movement of box2d body continous
I have some problem regarding movement of box2d sprite body.Problem is when i press left button than my sprite move left and when i release button my sprite will stop.
I know the logic of movement ...
0
votes
0answers
55 views
limiting a sprites movement after a mouseJoint is released
I have created a weldJoint between two sprites and I also created a method (spritePositionRelease) that returns the exact position of a sprite when a mouseJoint is released. I want to track the ...
1
vote
1answer
221 views
Cocos2d: Using single timer/scheduler for multiple sprites
want to know if is it possible to use single timer or scheduler method for multiple sprites ? Like I am now working on a game and there could be any number of sprites and i want to perform some ...
2
votes
0answers
244 views
Box2d based tile map game scrolling problem
I am using a tile based game and also used a joystick. Using joystick sprite body move perfectly but tile map can not scroll.
-(void)setCenterOfScreen:(b2Vec2)position
{
int ...
0
votes
0answers
94 views
Using same b2World in different classes/Layers
How can we use same b2world in different classes in our game.. ? I am having two classes gameLayer and weaponLayer respectively. I am trying to use the b2world I am using in gameLayer in weaponLayer ? ...
0
votes
1answer
117 views
HUD layer not being added on my scene [closed]
I have a CCScene which already holds my gameLayer and I am trying to add HUD layer on that.But the HUD layer is not getting added in my scene, I can say that because I have set up a CCLabel on HUD ...
-2
votes
1answer
504 views
How change the size of sprite in cocos2d?
I want to change the scale of sprite like a paper in 'Paper Toss' game.
'Paper Toss' is the game is available on the App store. I want to make a sprite like a paper and change the scale of sprite ...
0
votes
1answer
344 views
Cocos2d Box2d contact listener call different method in collided object
I have the building object, wen it hit with other, i want to call some method inside it.
Building.mm
-(void)printTest
{
NSLog(@"printTest method work correctly");
}
in my ContactListener i ...
1
vote
1answer
425 views
How make a laser path prediction line like a “slingshot cowboy” game?
How so I make a laser path prediction line like a “slingshot cowboy” game in cocos2d or box2d and select the target like "slingshot cowboy" game.
1
vote
1answer
203 views
How do I identify a collision with a specific body?
How can I identify when the ground body collides with another b2Body? I can use b2ContactListener to be notified of collision events, but how do I tell which bodies collided?
1
vote
1answer
100 views
Why is the MaskBit maxed out
Hi there for some reason the maskbit of my b2FixtureDef is being maxxed out and im not sure why
Here is the declaration of the items that are used in the game
enum PhysicBits {
PB_NONE = 0x0000,
...
0
votes
0answers
61 views
Creating a contact listener with sprites from different classes
I've been trying to set a contact listener that creates a joint on contact between two sprites which have their own classes. Both sprites are inheriting from NSObject and they are initialized in their ...
1
vote
0answers
205 views
Design pattern for procedural terrain assets
I'm developing a procedural terrain class at the moment and am stuck on the correct design pattern. The terrain is 2D and is constructed from a series of (x,y) points. I currently have a method that ...
2
votes
2answers
530 views
Simple 2D Flight Physics with Box2D
I'm trying to build a simple side scroller with an airplane being the player. As such, I want to build simple flight controls with simple but realistic-feeling physics. I'm making use of cocos2D and ...
0
votes
1answer
1k views
How to simulate a water splash effect?
I need to achieve the effect of a ball falling down into a pool then splashing in the water.
At first, I made a sensor to detect the collision between the ball and the water and then show the sprite ...
0
votes
1answer
363 views
Store and create game objects at positions along terrain
I have a circular character that rolls down terrain like that shown in the picture below.
The terrain is created from an array holding 1000 points. The ground is drawn one screen width infront and ...
2
votes
2answers
200 views
Moving 2d camera in the y direction
I'm developing a simple game for the iphone and am struggling to work out the best way for the camera to follow the main character. The following picture hightlights the three main components:
...
0
votes
2answers
564 views
Constant rotation of a revolute joint in box2d
I would like to have a line with one end attached to a location and have it rotate constantly (with the same speed) with a maximum of 45 to -45 degrees (i.e. I would like to have it swing like a rope ...
5
votes
1answer
359 views
Do I need to roll my own polygon segmentation algorithm to automate Box2d body creation from a tile map?
Before re-inventing the wheel I figured I'd ask:
I'm working on a tile-based 2d-maze level generator for cocos2d + box2d. The idea is:
I'm using one of the well-known graph traversal algorithms to
...
2
votes
0answers
211 views
how to attach a body to a rope and making it swing to another rope
I've set some ropes (using cocos2d and box2d) and would like to attach a body to one rope in such a way that it can swing to another rope. I am not sure how to go about this. I read making and object ...
0
votes
1answer
179 views
Why set the position of both b2Body and Box2DSprite?
In a game, we add a body for each sprite, the method is:
createBodyAtLocation:(CGPoint) forSprite:(Box2DSprite*)sprite
In which we create the body and we attach it to the sprite in parameter: ...
1
vote
3answers
916 views
Include Box2D libraries to a cocos2d project (iOS)
I have a problem including box2D to my cocos2d project. I've tried different ways to do it with no success. This is what I've done:
I downloaded Box2D (Box2D_v2.2.1) to my project directory.
Dragged ...
0
votes
1answer
1k views
b2Body moves without stopping
I got a quite strange bug. It is difficult to explain it in two words, but i'll try to do this in short.
My b2Body has restitution, friction, density, mass and collision group.
I'm controlling my ...
2
votes
2answers
584 views
Efficient Bullet Firing Class
I've been struggling with this for a while. I have been trying to create a bullet pool class for a game I have made that doesn't cause a significant fps drop.
I have tried creating a bullet pool ...
1
vote
1answer
996 views
Making an object swing from one rope to another
I am trying to make a Tarzan like game with Cocos2D and Box2D. I am having issues with the physics - making an object swing from one rope to another. I am not really sure how to do this. Could anyone ...
0
votes
0answers
806 views
Cocos2d Box2d how to shoot an object inside the screen [closed]
I have the code below :
- (id) initWithGame:(mainGame*)game {
if ((self = [super init])) {
isTouchEnabled_ = YES;
self.game = game;
CGSize size = [[CCDirector ...
2
votes
2answers
434 views
Physics in carrom like game using cocos2d + Box2D
I am working on carrom like game using cocos2d + Box2D. I set world gravity(0,0), want gravity in z-axis. I set following values for coin and striker body:
Coin body (circle with radius - ...
1
vote
1answer
615 views
How to make box2d mouse joint works similar to box2d setposition
I want to make b2mouse joint working similar to b2setposition, though i know in mouse joint force is applied, so it's not possible to reach the desired point without any delay like setPosition(), but ...
5
votes
4answers
865 views
How to port a game from IPad to Iphone
I just finished developing a 2D side scroll game for the IPad using Cocos2d and Box2d.
Now we want to make an IPhone 4 version of the game, but I'm still not sure what is the best way to do it.
I ...
1
vote
0answers
155 views
Which is the best model to present the destruction of the building in Box2D?
We'd like to create a "world-destruction" game. The problem is in choosing the best model for building destruction.
On my mind the building would be an array of objects( tiles). Each object would ...
4
votes
1answer
458 views
Worth using Box2d for collision but not physics?
I am currently doing some work in cocos2d-x and am thinking about using their box2d implementation for things like collision detection (but not necessarily response), range detection, and other things ...
0
votes
2answers
221 views
Slow motion of a spherical object on an blunt slant obstacle
In cocos2d environment and box2D when an spherical object falls on a blunt slant obstacle, it moves really slowly, that's nauseating, if you have coded to not to have any interaction with world while ...
-1
votes
1answer
277 views
Is it any good to make play game in zoom condition?
I'm developing a game with large obstacle and sprites(in cocos2d+box2d for iPhone), then after zooming out my sprites and layer (by increasing cameraZ), I make my game to play by user, which causes ...
1
vote
1answer
740 views
Stretching textures for CCSprites in Cocos2D
I'm making a game for iPhone and iPad w/ Cocos2D and Box2D. I scale the size of square objects ("blocks") using a pixel-to-meters ratio depending on the particular device. Can I stretch or shrink ...
1
vote
2answers
976 views
Looking for the reference tutorials for the joints in the Box2D for iphone
I can't find the tutorials of joints class in the Box2D for iPhone. I am unable to run a Testbed for iPhone Box2D.
(void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if ...
1
vote
1answer
232 views
Mouse joint isn't restricting the ball from going to the other part of the screen
I'm developing a application in cocos2d using the Box2D framework, but unfortunately I am having issues. I'm not able to restrict the orange ball in the half screen area, taking the image below as ...
7
votes
1answer
2k views
Basic Box2D collision detection
I don't understand how to listen for collisions in Cocos2D/Box2D. Say I have two dynamic circle bodies. One is very small and the other is relatively large. When the small circle collides w/ the ...
