jbox2d

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" +

跨平台用户体验统一正处于增长趋势：早些时候 iOS 和安卓有着不同的体验，但是最近在应用设计以及交互方面变得越来越接近。从安卓 Nougat 的底部导航到分屏特性，两个平台间有了许多相同之处。对设计师而言，我们可以将主流功能设计成两个平台一致（过去需要单独设计）。对开发者而言，这是一个提高、改进开发技巧的好机会。所以我们决定开发一个安卓气泡选择的组件库 —— 灵感来自于 苹果音乐 的气泡选择。 先说设计 我们的气泡选择动画是一个好的范例，它对不同的用户群体有着同样的吸引力。气泡以方便的 UI 元素汇总信息，通俗易懂并且视觉一致。它让界面对新手足够简单的同时还能吸引老司机的兴趣。 这种动画类型对丰富应用的内容由很大帮助，主要使用场景是：用户要从一系列选项中进行选择时的页面。例如，我们使用气泡来选择旅游应用中潜在目的地名字。气泡自由的浮动，当用户点击一个气泡时，选中的气泡会变大。这给用户很深刻的反馈并增强操作的直观感受。 组件使用白色主题，明亮的颜色和图片贯穿始终。此外，我决定试验渐变来增加深度和体积。渐变可能是主要的显示特征，会吸引新用户的注意。 气泡选择的渐变 我们允许开发者自定义所有的 UI 元素，所以我们的组件适合任意的应用。 再来看看开发者的挑战 当我决定实现这个动画时，我面临的第一个问题就是使用什么工具开发。我清楚知道绘制如此快速的动画在 Canvas 上绘制的效率是不够的

When trying to program a game using Box2D, I ran into a problem with Box2D. I filled in pixel numbers for the lengths of the the textures and sprites to create a box around it. Everything was at the right place, but for some reason everything went very slowly. By looking on the internet I found out that if you didn't convert pixels to meters box2d might handle shapes as very large objects. this seemed to be a logical cause of everything moving slowly. I found similar questions on this site, but the answers didn't really seem to help out. in most of the cases the solution was to make methods to

Before asking this i did A LOT of searching on the net. I just can't do it. It's a little hard for me to understand. So how do i draw the images at the right screen positions coresponding to bodies in world position? Thanx. If anyone else finds himslef in front of the same obstacle i posted a HOW TO, thanx to normalocity's good explanation. You can find it here: http://romeo.akademx.ro/2012/04/06/slick-and-box2d/ This is the render function: public void render(GameContainer container, StateBasedGame game, Graphics g) throws SlickException { g.setBackground(Color.white); g.pushTransform(); g