Category Archives: Html5

Websockets with php – tutorial on basics

By | February 12, 2013

Websockets Websockets is a new feature available in browsers as a part of the Html5 specs that allows javascript clients to open bi directional socket connections to a server. Currently all major desktop browsers support the api. Websocket is not an independant socket protocol, but is based on the TCP protocol just like HTTP. Therefore… Read More »

Revolute joint in box2d in javascript

By | January 26, 2013

Revolute Joint Revolute joint is a useful joint in box2d that allows 2 bodies to be pinned together at a point without restricting rotation. The joint can be made between 2 dynamic bodies or between a static and dynamic body. The pendulum on left is a static circle joined to dynamic rectangle. Whereas the cart… Read More »

Weld joint in box2d in javascript

By | January 12, 2013

Weld joint in box2d The weld joint can be used to join to bodies tightly at a common point. Here is an example A weld joint is created like this [js] //create distance joint between b and c var joint_def = new b2WeldJointDef(); joint_def.bodyA = b; joint_def.bodyB = c; //connect the centers – center in… Read More »