CollisionStateEntity for MelonJS

gistfile1.js

game.CollisionStateEntity = me.Entity.extend({
    init: function(x, y, settings) {

        this._super(me.Entity, 'init', [x, y , settings]);

        this.entitiesInside = {};
        this.entitiesInsideThisFrame = {};
    },

    update: function (dt) {
        me.collision.check(this);

        // check if entities left this frame
        if (this.entitiesInside) {
            for (var entityGUID in this.entitiesInside) {
                if (!this.entitiesInsideThisFrame || !this.entitiesInsideThisFrame[entityGUID]) {

                    var entity = this.entitiesInside[entityGUID];
                    this.onEntityDidLeave(entity);

                    if (entity.onDidLeaveEntity)
                        entity.onDidLeaveEntity(this);

                    delete this.entitiesInside[entityGUID];
                }
            }
        }

        // check if entities entered this frame
        if (this.entitiesInsideThisFrame) {
            for (var entityGUID in this.entitiesInsideThisFrame) {
                if (!this.entitiesInside[entityGUID]) {

                    var entity = this.entitiesInsideThisFrame[entityGUID];
                    this.onEntityDidEnter(entity);
                    
                    if (entity.onDidEnterEntity)
                        entity.onDidEnterEntity(this);

                    this.entitiesInside[entityGUID] = this.entitiesInsideThisFrame[entityGUID];
                }
            }
        }

        // clean up
        if (this.entitiesInsideThisFrame)
            this.entitiesInsideThisFrame = {};    

        return this._super(me.Entity, 'update', [dt]);
    },

    onCollision : function (a, b) {

        if (!this.entitiesInsideThisFrame)
            this.entitiesInsideThisFrame = {};

        this.entitiesInsideThisFrame[b.GUID] = b;

        return false;
    },

    onDidEnterEntity: function (entity) { 
    },

    onDidLeaveEntity: function (entity) {
    },

    getEntitiesInside: function () {
        return this.entitiesInside;
    }
});