box2d

I'm making a game in which a certain object (modelled as a box2d body) has to follow a fixed path. Is there a way by which I can specify the path coordinates and make the object advance over it for each dt? Thanks Another option: Attach a mouse joint to your body Use setTarget method of the mouse joint to move the body You should use a Kinematic body, but you can't change its position manually, you have to change its speed for the dynamics and collisions to be applied correctly. I suggest the following algorithm: 1st - Calculate the position on the track that the body should be in on the next

I am making a Box2d game for the iPhone. I need to apply a force on a body which represents my main character. The body is actually a rectangle on top of a circle connected using a revolute joint. I am using this as the skeleton for my character who is supposed to be running through the game(any suggestions or feedback on this too would be appreciated). I need a force to be applied continuously so that it keeps him moving. What would be the best way to do this? I am currently applying linear velocity inside the tick method. _world->Step(dt, 10, 10); if(gamestarted) { b2Vec2 force = b2Vec2(6,

I am really stuck on this I can successfully detect a collision but I can't make the two bodies involved in the collision to stick. Here is my ContactListener world.setContactListener(listener); listener = new ContactListener() { @Override public void preSolve(Contact contact, Manifold oldManifold) { } @Override public void postSolve(Contact contact, ContactImpulse impulse) { } //called when two fixtures cease to touch @Override public void endContact(Contact contact) { Fixture fixtureA = contact.getFixtureA(); Fixture fixtureB = contact.getFixtureB(); Gdx.app.log("beginContact", "between" +

I have a libGDX project that is built using maven. It's run fine in the past, but recently, it's stopped working, due to libGDX moving box2d to being an extension. I added the extension as a dependency to the core of my project like I would any other dependency: <dependency> <groupId>com.badlogicgames.gdx</groupId> <artifactId>gdx-box2d</artifactId> <version>${gdx.version}</version> <scope>compile</scope> </dependency> however, when I try to run the project for desktop (or anything else, really), I get the following error: [java] Caused by: com.badlogic.gdx.utils.GdxRuntimeException: Couldn't

Is there a way to refactor mixed C++/Objective-C code in Xcode ?? I am writing a game using Cocos2D and Box2D, and the Box2D is written on C++, so every class I write should have .mm extension and therefore when I try to e.g. rename the variable, I got a message like " Xcode can only refactor C and Objective-C code ". Thanks in advance! Sulthan Xcode is VERY limited with refactoring, even with plain Obj-C. It's basically renaming and it can't even rename in comments. If it says it can't do something, then it probably can't. The only way to rename is using find & replace . Note that Xcode can

I am using box2d on the iphone to create a game. I have a body that is effected by gravity to move down and not right or left. It will get hit by another body and will then be moving right or left. I then have a reset button which moves the body back to its starting point. The only problem is that it is still moving right or left. How can I counteract the forces that a ball is already traveling? How can I get rid of this right and left movement when I reset my game? box2d automatically clears forces each simulation step. I think you are just changing you body's position when reseting, but not

in my app i want to call some method in CCScene myscene in the case of device rotation(orientation change).I disabled the autorotation(because i want it not to happen). The issue is: i want to change gravity in the scene depending on my device orientation. My code : -(void) onEnter { [super onEnter]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notification_OrientationWillChange:) name:UIApplicationWillChangeStatusBarOrientationNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notification_OrientationDidChange:)