src/entity/draggable.js
function (e) {
            if (this.dragging === false) {
                this.dragging = true;
                this.grabOffset.set(e.gameX, e.gameY);
                this.grabOffset.sub(this.pos);
                return false;
            }
        }
function (e) {
            if (this.dragging === false) {
                this.dragging = true;
                this.grabOffset.set(e.gameX, e.gameY);
                this.grabOffset.sub(this.pos);
                return false;
            }
        }
function ( e ) { if ( this . dragging === false ) { this . dragging = true ; this . grabOffset . set ( e . gameX , e . gameY ) ; this . grabOffset . sub ( this . pos ) ; return false ; } }
Gets called when the user starts dragging the entity
@name dragStart
@memberOf me.DraggableEntity
@function
@param {Object} x the pointer event
Gets called when the user starts dragging the entity