JBox2D is a java physics engine often used in games an other physics simulations, and is a port/extension of the C++ physics engine, Box2D.

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GWT problem with Box2D WheelJoint

I am using the below libgdx java code for a wheel joint and rear axle using Box2D. This works fine for android, Desktop, but when I attempt to run through GWT I get the following error. at ...
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How do I create a Fixture in Andengine and assign it user data?

I´m following this tutorial: How do I use ContactListener in JBOX2D? in order to get input from player's bottom part including a fixture in player's main body. My problem is that I´m initializing ...
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Box2d world width and height ratio with screen width and height

I have view, for example GameView which extends SurfaceView . I have integrated Box2D physics in GameView. I have two widths , GameView width, height and Box2D physics world width ,height. I need to ...
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Apply impulse to ball to a fixed height Jbox2D android

I have to hit a ball to a fixed height repeatedly as shown in the following image. This game is similar to 1983 Hitit The difference is the hitting y axis will be variable. I wanted to hit the ...
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Impact js Multibody entities with animations

I have a simple impactjs project working with box2d. just a "car" that can run over some rough terrain. I would like to have the wheels spin though. I know I could accomplish this with a sprite sheet ...
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libgdx default saving mechanism for box2d world

I want to save my game in libgdx, and I have no problem using Kryo to save everything, except the box2d Worlds and the RayHandlers from box2dlights - these are not Serializable and do not have default ...
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How do I get the position of a static body in Jbox2D?

I'm trying to get the position of a static body in JBox2D, how do I do that?
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Which .jar has JBox2d's p5 package?

Using Eclipse, I'm trying to write a simple hello world program in processing that simply draws a rectangle on the screen then has gravity drop it as seen in this tutorial. The problem is that when ...
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Can't find PolygonDef in JBox2D [duplicate]

I was just following along with a tutorial on youtube and suddenly I couldn't import something named PolygonDef, just something named PolygonShape. I tried to finish the tutorial with the PolygonShape ...
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Box2D relations

As far as I know, the unit in Box2D is meters. When I use Box2D in Processing with JBox2D, I set the "world size" as the window size specified in the setup(). Now I'm wondering if there is any ...
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Using texture() in combination with JBox2D

I'm getting some trouble using the texture() method inside beginShape()/endShape() clause. In the display()-method of my class TowerElement (a bar which is DYNAMIC), I draw the object like ...
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JBox2D Polygon Collisions Acting Strange

I have been playing around with JBox2D and Slick2D and made a little demo with a ground object, a box object, and two different polygons. The problem I am facing is that the collision-detection for ...
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2D Polygon Triangulation

I am creating a game engine using the JBox2D physics engine. It only allows you to create polygon fixtures up to 8 vertices, To create a body with more than 8 vertices, you need to create multiple ...
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How do I use ContactListener in JBOX2D?

I have a character, and I need to know when he's touching a wall/floor. I look for some information but no luck. How do I do that? I saw a few things about ContactListeners and getContactList(). But I ...
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Libgdx - Box2D: Attach Physics Body Editor Loader mask to dynamic texture

I have a texture of a circle, which gets drawn to a new position when a touch drag occurs. It isn’t set up as a body. I have made a physics map using Aurelien Ribon's Physics Body Editor Loader GUI ...
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Camera scrolling and game boundaries

I am making a platformer game in JBox2D and LWJGL that has a scrolling camera, but I have hit a wall with the boundaries of the camera. Essentially what I have right now is a Box2D world that is ...
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Why won't my Box2d bodies collide? [closed]

I'm doing something wrong when trying to get bodies to collide using jBox2d & Slick2d. Here is have just my basic init, update, and render methods. Render and update seem to work fine for drawing ...
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How to translate from Slick2d coordinates to jBox2d

I read through this question to try and get a grasp on the topic, but I can't figure out how to apply this to my Slick2d window. I'm trying to do something as simple as place an edge on the bottom of ...
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Debug Render In Cocos2d Android

I want to implement debug render for cocos2d android.So I can view how bodies are created. Right now I use gdx.jar file for box2d and load that jar file following way. static { ...
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Box2D - Do these simple objects need to be in the simulation?

I would like to get input from the community regarding how best to represent simple objects in a Box2D based simulation. Some background: Without going into too much detail, think of a top down game ...
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2D js physics engine for HTML4

Is there any engine for Javascript like box2dweb that does not use Canvas? I need to build a game that works in HTML4 browsers.
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Box2D and Slick2D: Graphics bug [closed]

The bug The physics ground represented by a horizontal line. The object is stationary, and seems to be pretending that the ground is lower. This is because the center of the Shape is incorrectly ...
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Applying Forces to Box2D Bodies

In full disclosure, I am VERY new to box2D let alone the Java version of it. I have a box (here of type Hero) that I am trying to move. I did this by trying to apply a force as follows... private ...
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OutOfBounds Exception when creating a PolygonShape using jbox2d

So here's the deal, i'm parsing a file that contains the vertices for a polygon, that i want to create in box2d. I create a new PolygonShape() and then call .set() giving it a defined array of Vec, ...
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Why does creating dynamic bodies in JBox2D freeze my app?

My game hangs/freezes when I create dynamic bullet objects with Box2D and I don't know why. I am making a game where the main character can shoot bullets by the user tapping on the screen. Each touch ...
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How to apply impulse to a body to make it fly away?

I'm playing around with jbox2d and can't really make a body "fly away" as if from an explosion. From what I have found on the net, making the body fly away from the world center (0,0), should have ...
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JBox2D - how to get vertex positions?

I've created a triangle for jbox2d... public void createTri(){ PolygonDef shape = new PolygonDef(); shape.density = 2.0f; shape.friction = 0.8f; shape.restitution = 0.3f; ...