Babylon.js/gui/src/3D/controls/cylinderPanel.ts

/// <reference path="../../../../dist/preview release/babylon.d.ts"/>

module BABYLON.GUI {
    /**
     * Class used to create a container panel deployed on the surface of a cylinder
     */
    export class CylinderPanel extends VolumeBasedPanel {
        private _radius = 5.0;

        /**
         * Gets or sets the radius of the cylinder where to project controls (5 by default)
         */
        public get radius(): float {
            return this._radius;
        }

        public set radius(value: float) {
            if (this._radius === value) {
                return;
            }

            this._radius = value;

            Tools.SetImmediate(() => {
                this._arrangeChildren();               
            });
        }              

        protected _mapGridNode(control: Control3D, nodePosition: Vector3) {            
            let newPos = this._cylindricalMapping(nodePosition);
            let mesh = control.mesh;

            if (!mesh) {
                return;
            }

            switch (this.orientation) {
                case Container3D.FACEORIGIN_ORIENTATION:
                    mesh.lookAt(new BABYLON.Vector3(-newPos.x, 0, -newPos.z));
                    break;
                case Container3D.FACEORIGINREVERSED_ORIENTATION:
                    mesh.lookAt(new BABYLON.Vector3(newPos.x, 0, newPos.z));
                    break;
                case Container3D.FACEFORWARD_ORIENTATION:
                    mesh.lookAt(new BABYLON.Vector3(0, 0, 1));
                    break;
                case Container3D.FACEFORWARDREVERSED_ORIENTATION:
                    mesh.lookAt(new BABYLON.Vector3(0, 0, -1));
                    break;
            }
            
            control.position = newPos;
        }

        private _cylindricalMapping(source: Vector3)
        {
            let newPos = new Vector3(0, source.y, this._radius);

            let yAngle = (source.x / this._radius);

            Matrix.RotationYawPitchRollToRef(yAngle, 0, 0, Tmp.Matrix[0]);

            return Vector3.TransformNormal(newPos, Tmp.Matrix[0]);
        }
    }
}