package scalation.scala3d

import javafx.application.Application
import javafx.event.{Event, EventHandler, EventTarget}
import javafx.scene.Group
import javafx.scene.input.MouseEvent
import javafx.scene.paint.{Color, PhongMaterial}
import javafx.scene.transform.{Rotate, Scale, Translate}
import javafx.scene.shape.Shape3D
import javafx.css.Styleable


 class Line3D (p1: Point3D, p2: Point3D) extends Cylinder(1, p1.distance(p2))
{
	val yaxis = new Point3D(0.0,1.0,0.0)
	println("p1="+p1)
	println("p2="+p2)
	   var midPt = p2.midpoint(p1)
        var translateMidpoint = new Translate(midPt.getX(),midPt.getY(),midPt.getZ())
        var axis = p2.subtract(p1).crossProduct(yaxis)
        var angle = Math.acos(p2.subtract(p1).normalize().dotProduct(yaxis))
        var rotation  = new Rotate(-Math.toDegrees(angle),axis)
    	getTransforms().add(translateMidpoint)
    	getTransforms().add(rotation)
}

 class Line3Dend (p1: Point3D, p2: Point3D) extends Line3D(p1,p2)
{
		val sphere1 = new Sphere(4.0)
    	val sphere2 = new Sphere(4.0)
		
        sphere1.getTransforms().add(new Translate(p1.getX(),p1.getY(),p1.getZ()))
        sphere2.getTransforms().add(new Translate(p2.getX(),p2.getY(),p2.getZ()))
        
        def getSpheres() = (sphere1, sphere2) 
}
case class Line3DHelper() extends javafx.application.Application()
{
	val root = new Group()
    val camera = new javafx.scene.PerspectiveCamera(true)
    var anchorX: Double = _
    var anchorY: Double = _
    var anchorAngle: Double = _

    def mkEventHandler[E <: Event](f: E => Unit) = new EventHandler[E] { def handle(e: E) = f(e) }

    override def start (primaryStage: javafx.stage.Stage)
    {
        println("start 3D")
        buildCamera()
        val p1 = new Point3D(0,0,0)
		val p2 = new Point3D(50,-100,50)

	    val line = new Line3Dend(p1,p2)
        
	    val s = line.getSpheres()
        val group1 = new Group(s._1)
        val group2 = new Group(s._2)
   		val group3 = new Group(line)
	  root.getChildren().addAll(group1,group2,group3)
	try{ 
		val scene = new Scene(root,1024,768,true)
		scene.setOnMousePressed (mkEventHandler ((event: MouseEvent) =>
            {
                anchorX = event.getSceneX ()
                anchorY = event.getSceneY ()
                anchorAngle = camera.getRotate ()
            }))
            scene.setOnMouseDragged(mkEventHandler((event: MouseEvent) =>
            {
                camera.setRotate (anchorAngle + anchorX - event.getSceneX ())
            }))
		 scene.setFill (javafx.scene.paint.Color.YELLOW)
            primaryStage.setTitle ("Scala3d sample")
            primaryStage.setScene (scene)
            primaryStage.show ()
            scene.setCamera (camera)
        } catch {
            case e: Exception => e.printStackTrace ()
        } // try
    }
    
    def buildCamera()
    {
        val translateZ = new Translate (0,0,-1000)
        camera.getTransforms ().add (translateZ)
        camera.setNearClip (0.0001)
        camera.setFarClip (1000.0)
    } // buildCamera

}



object Line3DTest
{
	def main(args: Array [String]){
		javafx.application.Application.launch(classOf [Line3DHelper], args: _*)
	}
}