box2d

I have an arrow that I rotate with touch. I was wondering if it was possible to rotate the arrow on a curved line? I've done some research and I think it is called a bezier path? Is it even possible to rotate a sprite on a bezier path using this code and if so how would I even incorporate it? UITouch *touch = [touches anyObject]; //acquire the previous touch location CGPoint firstLocation = [touch previousLocationInView:[touch view]]; CGPoint location = [touch locationInView:[touch view]]; //preform all the same basic rig on both the current touch and previous touch CGPoint touchingPoint = [

This is a very simple scene with box2d. I tried different viewports and different screen sizes. I could not figure out why the body drops very slow. Actually, I am not quite sure that it is slow, the reason is maybe the viewport settings etc. This is main class: public class Main extends Game { LevelScreen levelScreen; @Override public void create () { levelScreen = new LevelScreen(); setScreen(levelScreen); } @Override public void render () { super.render(); } } And level screen: public class LevelScreen extends Stage implements Screen { private Batch batch; private Camera camera; private

i have a question about moving a Box2D body to a specific position without using this for example. body->SetTransform(targetVector,body->GetAngle()) I have some code which works for applyForce ( here ): const float destinationControl = 0.3f; b2Vec2 missilePosition = _physicalBody->GetPosition(); b2Vec2 diff = targetPosition - missilePosition; float dist = diff.Length(); if (dist > 0) { // compute the aiming direction b2Vec2 direction = b2Vec2(diff.x / dist, diff.y / dist); // get the current missile velocity because we will apply a force to compensate this. b2Vec2 currentVelocity =

I'm trying to make a spiral vortex in Box2D on C++ / Objective C by applying forces. What I would like to realize is a vortex that pushes the bodies from a point, or that attract them. I guess I'll have to apply more than one force. My entry point in this problem is : I think I have to apply 3 forces : - An impulse to attract or repulse the body from the center. - An impulse to make it move laterally on a spiral, but... how ? - A torque to rotate the body itself if the impulse don't do it for me. I once did a rotating platform by making a circular sensor which applied a tangential speed change

hey the title pretty much says it all. i have been trying different methods from internet sources, but whenever i try something goes wrong..this is where i got Box2D in cMake , i get a bunch of errors when building it(i was going through the steps in the readme.txt, but onfortunately, theyre for Visual C++...) so im wondering hot to set this up as i guess a library (.lib or .a) and use it in my project(my friend passed me his library and when i loaded it in and tried #include ing the box2D headers, they didnt read at all(i got a list of undefined errors) also his box2d was i believe made for

does anyone know whether bodies only collide when (body1.categoryBits & body2.maskBits) && (body1.maskBits & body2.categoryBits) ? or do they already collide when (body1.categoryBits & body2.maskBits) || (body1.maskBits & body2.categoryBits) ? If anyone is still looking for more explanations, I made a detailed tutorial here : http://aurelienribon.wordpress.com/2011/07/01/box2d-tutorial-collision-filtering/ From the Box2D manual : 6.2.3. Filtering Collision filtering is a system for preventing collision between shapes. For example, say you make a character that rides a bicycle. You want the