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/** @author  John Miller
 *  @version 1.2
 *  @date    May 15 11:58:34 EDT 2015
 *  @see     LICENSE (MIT style license file).
 *
 * @see https://docs.oracle.com/javafx/8/3d_graphics/camera.htm
 *
 * x-axis - points right
 * y-axis - points down
 * z-axis - points back
 */

package scalation.scala3d

import javafx.scene.{PerspectiveCamera, Node}

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/** The `Camera3D` class is used to create a camera to be added to a scene
 *  (3D with perspective).
 *  @param back  the distance to move the camera back in -z direction
 */
case class Camera3D (back: Double = 100.0)
      extends PerspectiveCamera (true)
{
    val translateZ = Point3D (0.0, 0.0, -back)
    //getTransforms ().add (Translate (translateZ))
    getTransforms ().add (Translate (0.0, 0.0, -back))

    //::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
    /*  Flip the camera up-side down, if you prefer the y-axis to point up.
     *  @see Example 3-4 in above URL.
     *  @param root  the root node of the scene graph
     *  FIX: need implementation of Xform from MoleculeSampleApp
     *  @see https://docs.oracle.com/javafx/8/3d_graphics/Xform.java.html
     *
    def flip (root: Node)
    {
        val cameraXform = new Xform ()
        root.getChildren ().add (cameraXform)
        cameraXform.getChildren ().add (camera)
        val rz = Rotate (180.0, Rotate.Z_AXIS)
        camera.getTransforms().add (rz)
    } // flip
     */

} // Camera3D class