/*------------*/
/* Ja67.java  */
/*------------*/
/*-----------------------------------------*/
/*  ラジオボタンの設定は本書では説明省略   */
/*-----------------------------------------*/
import java.applet.Applet;
import java.awt.*;                          //BorderLayout,GraphicsConfiguration,event
import javax.media.j3d.*;                   //Java3d
import com.sun.j3d.utils.applet.MainFrame;  //MainFrame
import com.sun.j3d.utils.universe.*;        //SimpleUniverse
import com.sun.j3d.utils.geometry.*;        //Primitive
import com.sun.j3d.utils.behaviors.mouse.*; //Mouse
import javax.vecmath.*;                     //Point3f,Color3f
import java.awt.event.*;                    //Checkbox

public class Ja67 extends Applet implements ItemListener{

    private SimpleUniverse simpleU;
    private BoundingSphere bounds = new BoundingSphere(new Point3d(), 10.0);
    ColoringAttributes ca = new ColoringAttributes();
    //ラジオボタン-------
    CheckboxGroup radio;
    Checkbox radio1, radio2;

    public void init(){

        //アプレットの中央にCanvas3Dを追加
        setLayout(new BorderLayout());
        Canvas3D canvas = new Canvas3D(SimpleUniverse.getPreferredConfiguration());
        add(canvas, BorderLayout.CENTER);

        //シーングラフの生成
        simpleU = new SimpleUniverse(canvas);
        simpleU.getViewingPlatform().setNominalViewingTransform();

        //シーングラフの作成
        simpleU.addBranchGraph(createSceneGraph());

        //GUIの作成
        createGUI();
    }

    private BranchGroup createSceneGraph(){

        BranchGroup branchG0 = new BranchGroup();

        //背景色の設定（設定が無い場合は黒）
        Background background = new Background(new Color3f(0.3f, 0.3f, 0.3f));
        background.setApplicationBounds(bounds);
        branchG0.addChild(background);

        //光源を追加
        branchG0.addChild(createDirectionalLight());

        //座標系を少し縮小
        Transform3D scale = new Transform3D();
        scale.setScale(0.6);
        TransformGroup transG0 = new TransformGroup(scale);
        branchG0.addChild(transG0);

        //Appearanceを作成
        Appearance ap = new Appearance();
        PolygonAttributes pa = new PolygonAttributes();
        pa.setCullFace(PolygonAttributes.CULL_NONE);        //裏面も表示する
        pa.setBackFaceNormalFlip(true);                     //裏面にも法線設定
        ap.setPolygonAttributes(pa);
        ca.setShadeModel(ColoringAttributes.SHADE_FLAT);    //フラット（初期値）
        ap.setColoringAttributes(ca);
        Material ma = new Material();
        ma.setDiffuseColor(new Color3f(0.0f, 0.0f, 1.0f));
        ma.setSpecularColor(new Color3f(0.3f, 0.3f, 0.3f));
        ma.setShininess(128.0f);
        ap.setMaterial(ma);

        //四角形ポリゴンをdiv*div作成
        float rSphere = 3.0f;
        int div = 2;

        Point3f[] vertex = new Point3f[4];
        Vector3f[] normal = new Vector3f[4];
        float[] x = new float[4];
        float[] y = new float[4];
        float[] xx = new float[4];
        float[] yy = new float[4];
        float[] zz = new float[4];
        x[0] = -1.0f; x[1] =  0.0f; x[2] =  0.0f; x[3] = -1.0f;
        y[0] = -1.0f; y[1] = -1.0f; y[2] =  0.0f; y[3] =  0.0f;

        for(int i=0; i<div ; i++){        //横方向
            xx[0] = x[0] + i;
            xx[1] = x[1] + i;
            xx[2] = x[2] + i;
            xx[3] = x[3] + i;
            for(int j=0; j<div ; j++){    //縦方向
                yy[0] = y[0] + j;
                yy[1] = y[1] + j;
                yy[2] = y[2] + j;
                yy[3] = y[3] + j;
                for(int k=0; k<4; k++){
                    zz[k] = (float)Math.sqrt((double)(rSphere*rSphere-xx[k]*xx[k]-yy[k]*yy[k]));
                    vertex[k] = new Point3f(xx[k], yy[k], zz[k]-rSphere);
                    normal[k] = new Vector3f(xx[k], yy[k], zz[k]);
                    normal[k].normalize();
                }
                //四角形の生成
                QuadArray quadA
                    = new QuadArray(vertex.length,
                        GeometryArray.COORDINATES | GeometryArray.NORMALS);
                quadA.setCoordinates(0, vertex);
                quadA.setNormals(0, normal);
                Shape3D quad3D = new Shape3D(quadA, ap);
                transG0.addChild(quad3D);
                //参考の為に法線を書く
                for(int k=0; k<4; k++){
                    transG0.addChild(drawNormal(vertex[k], normal[k]));
                }
            }
        }

        //Capability設定
        ca.setCapability(ColoringAttributes.ALLOW_SHADE_MODEL_WRITE);

        //マウスによる物体移動
        transG0.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
        transG0.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
        MouseRotate mouseRot = new MouseRotate(transG0);
        mouseRot.setSchedulingBounds(bounds);
        transG0.addChild(mouseRot);

        branchG0.compile();

        return branchG0;
    }

    //平行光源を作成する
    private Light createDirectionalLight(){

        DirectionalLight lightD = new DirectionalLight();   //デフォルトの平行光源
        lightD.setInfluencingBounds(bounds);                //光が影響する範囲

        return lightD;
    }

    //法線を作成する
    private Shape3D drawNormal(Point3f point1, Vector3f vec){

        Point3f point2 = new Point3f(point1);
        Point3f[] vertex = new Point3f[2];
        Color3f[] color = new Color3f[2];

        vec.scale(0.5f);
        point2.add(vec);

        vertex[0] = point1;
        vertex[1] = point2;
        color[0] = new Color3f( 1.0f, 1.0f, 0.0f);
        color[1] = new Color3f( 1.0f, 1.0f, 0.0f);

        LineArray lineA
            = new LineArray(vertex.length,
                GeometryArray.COORDINATES | GeometryArray.COLOR_3);
        lineA.setCoordinates(0, vertex);
        lineA.setColors(0, color);
        Shape3D line3D = new Shape3D(lineA);

        return line3D;
    }

    //GUIの作成
    private void createGUI(){

        radio = new CheckboxGroup();
        radio1 = new Checkbox("フラット", true, radio);
        radio2 = new Checkbox("グーロー", false, radio);
        Panel panel = new Panel();
        panel.add(radio1);
        panel.add(radio2);
        radio1.addItemListener(this);
        radio2.addItemListener(this);
        add(panel, BorderLayout.SOUTH);
    }

    //ラジオボタンイベント処理
    public void itemStateChanged(ItemEvent e){

        if(e.getItemSelectable()==radio1){
            ca.setShadeModel(ColoringAttributes.SHADE_FLAT);    //フラット
        }else if(e.getItemSelectable()==radio2){
            ca.setShadeModel(ColoringAttributes.SHADE_GOURAUD); //グーロー
        }
    }

    public void destroy(){

        simpleU.cleanup();
    }

    public static void main(String[] args){    //Application

        MainFrame frame = new MainFrame(new Ja67(), 512, 512);
    }
}