Question

我有四节课， MAIN，世界（包含所有变量），Level（敌人和砖块的代码）和Level1

主要课程

package {
    import flash.display.Sprite;
    import flash.display.Stage;
    import flash.events.*;
    import Level;
    import world;

    public class Main extends Sprite {

        public var enemy: enemyMc = new enemyMc();
        public var worldVar:world = new world();
        public var bric:Brick;
        public function Main() {

        var bg: backgroundMc = new backgroundMc();
            addChild(worldVar.m_sprite);
            worldVar.m_sprite.addChild(bg);
            worldVar.m_sprite.addChild(enemy);
            var level = new Level(this, this.stage);

        }
    }

}

世界级

package  {
import Box2D.Dynamics.*;
import Box2D.Collision.Shapes.*;
import Box2D.Common.Math.*;
import flash.display.Sprite;



public class world {

        public var gravity: b2Vec2 = new b2Vec2(0, 9.81); // define gravity
        public var createWorld: b2World = new b2World(gravity, true); // add gravity and put to sleep if not active to true
        public var worldScale: int = 30; // convert meters into pixels
        public var enemySphere: b2Body;
        public var timeStep = 1 / 60;
        public var enemyPlacementX = 210; 
        public var enemyPlacementY = 325;
        public var m_sprite:Sprite = new Sprite();

        public function world() {

            addWall(800, 10, 0, 490);  //floor
            addWall(800, 10, 0, -5);// ceiling
            addWall(10, 600, 0, 0); // left
            addWall(10, 600, 800, 0); // right
            // constructor code


        }


        private function addWall(w, h, px, py): void {
            var floorShape: b2PolygonShape = new b2PolygonShape();
            floorShape.SetAsBox(w / worldScale, h / worldScale);
            var floorFixture: b2FixtureDef = new b2FixtureDef();
            floorFixture.density = 0;
            floorFixture.friction = 10;
            floorFixture.restitution = 0.2;
            floorFixture.shape = floorShape;
            var floorBodyDef: b2BodyDef = new b2BodyDef();
            floorBodyDef.position.Set(px / worldScale, py / worldScale);
            var floor: b2Body = createWorld.CreateBody(floorBodyDef);
            floor.CreateFixture(floorFixture);

        }
   }
}

Level类，它从Main获取一个阶段引用 class还具有更新功能，可以检测box2D世界中的任何冲突

public function updateWorld(e: Event): void {

        var velIterations: int = 10; // times velocity of objects get updated
        var posIterations: int = 10; // adjusts positions to avoid overlap
        worldVar.createWorld.Step(worldVar.timeStep, velIterations, posIterations); // setup the bodies in the world update speed  10, 10 is a safe number
        for (var currentBody: b2Body = worldVar.createWorld.GetBodyList(); currentBody; currentBody = currentBody.GetNext()) {
            if (currentBody.GetUserData()) {
                currentBody.GetUserData().x = currentBody.GetPosition().x * worldVar.worldScale;
                currentBody.GetUserData().y = currentBody.GetPosition().y * worldVar.worldScale;
                currentBody.GetUserData().rotation = currentBody.GetAngle() * (180 / Math.PI);
            }
        }
        worldVar.createWorld.ClearForces(); // clear forces to let the simulation start again
        worldVar.createWorld.DrawDebugData();

    }

它还有另一个创建砖块的功能

public function brick(pX: int, pY: int, w: Number, h: Number, stg:Stage): void {

        var bric = new Brick();
        stg.addChild(bric); //assign it to the stage

        bric.x = pX;
        bric.y = pY;
        bric.width = w;
        bric.height = h;

        var polygonShape: b2PolygonShape = new b2PolygonShape();
        var polygonFixture: b2FixtureDef = new b2FixtureDef();
        polygonShape.SetAsBox(w / 2 / worldVar.worldScale, h / 2 / worldVar.worldScale);
        polygonFixture.shape = polygonShape;
        polygonFixture.density = 1;
        polygonFixture.restitution = 0.5;
        polygonFixture.friction = 0.9;
        var brickbodyDef: b2BodyDef = new b2BodyDef();
        brickbodyDef.type=b2Body.b2_dynamicBody;
        brickbodyDef.userData = bric;
        brickbodyDef.position.Set(bric.x / worldVar.worldScale, bric.y / worldVar.worldScale);
        var theBrick: b2Body = worldVar.createWorld.CreateBody(brickbodyDef);
        theBrick.CreateFixture(polygonFixture);


    }

碰撞检测在砖块和敌人之间运作良好，直到我将砖块代码移动到另一个类别中，然后我看到的就是在悬挂或浮动状态下放置在舞台上的砖块，没有碰撞检测。

注意：敌人和墙壁之间的碰撞仍然有效虽然墙壁也是在另一个班级创造的世界＆＃34; 不知道这里有什么问题。

这是Level1类不起作用

package  {
import flash.display.Sprite;
import flash.display.Stage; 
import flash.events.Event;
import Box2D.Dynamics.*;
import Box2D.Collision.*;
import Box2D.Collision.Shapes.*;
import Box2D.Common.Math.*;
import Box2D.Dynamics.Joints.*;
import world;



public class Level1  {
    private var worldVar:world = new world();

    public function Level1() {

    }

    public function brick(pX: int, pY: int, w: Number, h: Number, stg:Stage): void {

        var bric = new Brick();
        stg.addChild(bric);
        bric.x = pX;
        bric.y = pY;
        bric.width = w;
        bric.height = h;

        var polygonShape: b2PolygonShape = new b2PolygonShape();
        var polygonFixture: b2FixtureDef = new b2FixtureDef();
        polygonShape.SetAsBox(w / 2 / worldVar.worldScale, h / 2 / worldVar.worldScale);
        polygonFixture.shape = polygonShape;
        polygonFixture.density = 1;
        polygonFixture.restitution = 0.5;
        polygonFixture.friction = 0.9;
        var brickbodyDef: b2BodyDef = new b2BodyDef();
        brickbodyDef.type=b2Body.b2_dynamicBody;
        brickbodyDef.userData = bric;
        brickbodyDef.position.Set(bric.x / worldVar.worldScale, bric.y / worldVar.worldScale);
        var theBrick: b2Body = worldVar.createWorld.CreateBody(brickbodyDef);
        theBrick.CreateFixture(polygonFixture);         

    }               
}

}

以下是我在Level类中进行的调用

level1.brick(535, 214, 215, 120, stg);

使用AS3在box2d中进行碰撞检测

0 个答案: