Box2D Jump in Platformer Engine

Вот мой код для реализации проверки может/не может герой прыгать. За одно тут же и проверка на пересечение героем платформ-"облаков" снизу. Устанавливаем свой contactListener в world. В конце каждого обновления мира делаем сброс значению canJump.	Here is my code for jumping check (can/can't jump). Also cloud platforms realization. Setting up custom contactListener into world. On every world update function making reset for canJump variable (in the end of update function).
package { import Box2D.Dynamics.*; import Box2D.Collision.*; import Box2D.Collision.Shapes.*; import Box2D.Dynamics.Joints.*; import Box2D.Dynamics.Contacts.*; import Box2D.Common.*; import Box2D.Common.Math.*; public class customb2ContactListener extends b2ContactListener { private var canJump:Boolean = false; public function ResetCanJump():void { canJump = false; } public function CanJump():Boolean { return canJump; } public function customb2ContactListener() { } override public function BeginContact(contact:b2Contact):void { } override public function PreSolve(contact:b2Contact, oldManifold:b2Manifold):void { var fixtureA:b2Fixture=contact.GetFixtureA(); var fixtureB:b2Fixture=contact.GetFixtureB(); var local_canJump:Boolean = false; if ((fixtureA.GetBody().GetUserData()=="platform" && fixtureB.GetBody().GetUserData()=="hero")|| (fixtureA.GetBody().GetUserData()=="hero" && fixtureB.GetBody().GetUserData()=="platform")|| (fixtureA.GetBody().GetUserData()=="cloud" && fixtureB.GetBody().GetUserData()=="hero")|| (fixtureA.GetBody().GetUserData()=="hero" && fixtureB.GetBody().GetUserData()=="cloud")) { if(contact.IsTouching()) { if(fixtureA.GetBody().GetUserData() == "platform" || fixtureA.GetBody().GetUserData() == "cloud") { local_canJump = fixtureA.TestPoint(new b2Vec2(fixtureB.GetBody().GetPosition().x, fixtureB.GetBody().GetPosition().y + 0.6));//y + half of hero height + 0.1 }else{ local_canJump = fixtureB.TestPoint(new b2Vec2(fixtureA.GetBody().GetPosition().x, fixtureA.GetBody().GetPosition().y + 0.6));//y + half of hero height + 0.1 } if (fixtureA.GetBody().GetUserData()=="cloud" || fixtureB.GetBody().GetUserData()=="cloud") { if(local_canJump) { //check if we are still inside platform var inside:Boolean = false; if(fixtureA.GetBody().GetUserData() == "cloud") { inside = fixtureA.TestPoint(new b2Vec2(fixtureB.GetBody().GetPosition().x, fixtureB.GetBody().GetPosition().y + 0.45));//y + half of hero height - 0.5 }else{ inside = fixtureB.TestPoint(new b2Vec2(fixtureA.GetBody().GetPosition().x, fixtureA.GetBody().GetPosition().y + 0.45));//y + half of hero height - 0.5 } if(inside == true) { local_canJump = false; canJump = false; contact.SetEnabled(false); } }else{ contact.SetEnabled(false); } } } } //if canJump once set to true - do not change on next contacts if(canJump == false) { canJump = local_canJump; } } } }