import java.applet.*;
import java.awt.*;
import java.awt.event.*;

/*
<applet code="Bezier.class" width=480 height=480>
</applet>
*/

public class Bezier extends Applet
{
    static int WIDTH, HEIGHT;        // 画面サイズ
    Point point[][];                 // 制御点
    int point_num = 0;               // 制御点の番号
    int captured_point = -1;         // つかんでいる制御点の番号
                                     //（-1のときつかんでいない）
    boolean capture_mode_FLG;        // 線を制御できるかを表すフラグ

    static final int point_data[][][] =    // 点情報
        {
			{ {230, 300}, {185, 320}, {200, 350}, {260, 350}, {275, 320}, {230, 300} },//鼻

            { {208, 330}, {160, 350}, {165, 410} },//ヒゲ
            { {165, 410}, {180, 405} },//ヒゲ
            { {180, 405}, {190, 430}, {210, 450} },//ヒゲ
            { {210, 450}, {250, 435}, {255, 420} },//ヒゲ
            { {255, 420}, {275, 430} },//ヒゲ

            { {275, 430}, {285, 410} },//ヒゲ
            { {285, 410}, {295, 420} },//ヒゲ
            { {295, 420}, {300, 385}, {275, 345}, {249, 330} },//ヒゲ
   		    { {100, 290}, {90, 370}, {166, 390} },//右輪郭
		    { {365, 300}, {370, 370}, {293, 390} },//左輪郭

		    { {85, 280}, {80, 315}, {100, 325} },//右耳
		    { {375, 285}, {383, 325}, {363, 330} },//左耳
		    { {110, 220}, {80, 230}, {60, 285}, {100, 280} },//ファー
		    { {100, 280}, {150, 273}, {175, 290}, {250, 280} },//ファー
		    { {250, 280}, {305, 280}, {355, 295}, {380, 280} },//ファー

		    { {380, 280}, {390, 255}, {370, 240}, {355, 245} },
		    { {355, 245}, {315, 255}, {290, 230}, {270, 225} },//ファー
		    { {270, 225}, {200, 220}, {150, 245}, {125, 215}, {110, 220} },//ファー
		    { {110, 220}, {140, 170}, {200, 120}, {295, 100},},//帽子
		    { {295, 100}, {325, 120}, {345, 200}, {355, 245},},//帽子

		    { {270, 105}, {250, 80}, {300, 50}, {335, 90}, {310, 115}, {304, 110} },//ポンポン
		    { {145, 290}, {130, 300}, {135, 305}, {150, 300}, {165, 305}, {170, 280}, {145, 290} },//右まゆ
		    { {150, 325}, {165, 325}, {155, 315}, {145, 315}, {135, 325}, {145, 330}, {150, 325} },//右目
		    { {315, 290}, {330, 300}, {335, 305}, {310, 300}, {295, 305}, {290, 280}, {315, 290} },//右まゆ
		    { {310, 325}, {295, 325}, {305, 315}, {315, 315}, {320, 325}, {325, 330}, {310, 325} },//右目

		    { {165, 340}, {150, 350}, {145, 370} },//右しわ
            { {295, 340}, {310, 350}, {315, 370} },//左しわ
			{ {125, 315}, {135, 318} },//右目しわ
            { {125, 320}, {135, 320} },//右目しわ
            { {125, 325}, {135, 322} },//右目しわ

            { {335, 315}, {325, 318} },//左目しわ
			{ {335, 320}, {325, 320} },//左目しわ
            { {335, 325}, {325, 322} },//左目しわ

         };

    Label tf;

    Graphics offg, backg;
    Image    offi, backi;

    public void initialize()                   // 制御点の設定
    {
        int i;
        point = new Point[point_data.length][];

        for(i = 0; i < point.length; i++)
        {
            point[i] = new Point[point_data[i].length];
            for(int j = 0; j < point_data[i].length; j++)
                point[i][j] = new Point(point_data[i][j][0],
                                        point_data[i][j][1]);
        }
    }

    public void init()
    {
        WIDTH = 480; HEIGHT = 480;

        Button increment, decrement, modify;
        increment = new Button("次の曲線へ");          // 画面設定
        decrement = new Button("前の曲線へ");
        modify = new Button("変形");
        tf = new Label(Integer.toString(point_num));
        add(modify);
        add(increment);
        add(decrement);
        add(tf);

        increment.addActionListener(new ActionListener() // 制御点番号を増やす
        {
            public void actionPerformed(ActionEvent ae)
            {
                point_num++;
                if(point_num >= point.length)
                    point_num = 0;
                tf.setText(Integer.toString(point_num));
                repaint();
            }
        });

        decrement.addActionListener(new ActionListener()  // 制御点番号を減らす
        {
            public void actionPerformed(ActionEvent ae)
            {
                point_num--;
                if(point_num < 0) point_num = point.length-1;
                tf.setText(Integer.toString(point_num));
                repaint();
            }
        });

        modify.addActionListener(new ActionListener()  // モード変更
        {
            public void actionPerformed(ActionEvent ae)
            {
                capture_mode_FLG = !capture_mode_FLG;
                repaint();
            }
        });

        addMouseListener(new MouseAdapter()
        {
            public void mousePressed(MouseEvent me)    // 制御点をつかむ
            {
                int i, mx = me.getX(), my = me.getY();
                for(i = 0; i < point[point_num].length; i++)
                {
                    if(point[point_num][i].x-3 <= mx &&
                       point[point_num][i].x+3 >= mx &&
                       point[point_num][i].y-3 <= my &&
                       point[point_num][i].y+3 >= my)
                        break;
                }
                if(i < point[point_num].length) captured_point = i;
            }

            public void mouseReleased(MouseEvent me)
            {
                captured_point = -1;
            }
        });

        addMouseMotionListener(new MouseMotionAdapter() // 制御点を動かす
        {
            public void mouseDragged(MouseEvent me)
            {
                if(captured_point == -1) return;
                point[point_num][captured_point].setLocation(me.getX(), me.getY());
                repaint();
            }
        });

        initialize();

        offi = createImage(WIDTH, HEIGHT);
        offg = offi.getGraphics();
        backi = createImage(WIDTH, HEIGHT);
        backg = backi.getGraphics();
        setBackImage(backg);

     // test!
        addKeyListener(new KeyAdapter()
        {
            public void keyPressed(KeyEvent ke)
            {
                int c = ke.getKeyCode();
                if(c == 'P')
                {
                    System.out.println("{");
                    for(int i = 0; i < point[point_num].length; i++)
                        System.out.println(""+point[point_num][i].x
                                        +", "+point[point_num][i].y);
                    System.out.println("},");
                }
                else if(c == 'B')
                {
                    // BezierCurve(backg, Color.black);
                    repaint();
                }
            }
        });
    }

    public void setBackImage(Graphics g)    // 背景の用意
    {
        g.setColor(Color.white);
        g.fillRect(0, 0, WIDTH, HEIGHT);
        g.setColor(Color.black);
        g.drawRect(0, 0, WIDTH-1, HEIGHT-1);  // 枠描画
    }

    public int kaijyo(int num)            // 階乗を計算
    {
        int total = 1;

        if(num == 0) return 1;

        for(; num > 1; num--)
            total *= num;
        return total;
    }

    public void BezierCurve(Graphics g, Color color, Point point[])  // 曲線描画
    {
        int i, j;
        double x1, x2, y1, y2;
        double bernstein[] = new double[point.length];
        x1 = point[0].x;
        y1 = point[0].y;

        g.setColor(color);

        for(double t = 0; t <= 1; t += 0.01)
        {
            for(i = 0; i < point.length; i++)        // bernstein関数を計算
            {
                bernstein[i] = (double)kaijyo(point.length-1)
                            / (kaijyo(i)*kaijyo(point.length-1-i));

                for(j = 1; j <= i; j++) bernstein[i] *= t;
                for(j = 1; j <= point.length-1-i; j++) bernstein[i] *= (1-t);
            }

            x2 = y2 = 0;
            for(i = 0; i < point.length; i++)
            {
                x2 += point[i].x * bernstein[i];
                y2 += point[i].y * bernstein[i];
            }

            g.drawLine((int)x1, (int)y1, (int)x2, (int)y2);
            x1 = x2;
            y1 = y2;
        }
    }

    public void paint(Graphics g)
    {
        requestFocus();
        offg.drawImage(backi, 0, 0, this);  // 背景の描画

        if(capture_mode_FLG)           // 制御点の描画
        {
            offg.setColor(Color.red);
            for(int i = 0; i < point[point_num].length; i++)
            {
                offg.fillRect(point[point_num][i].x-3,
                              point[point_num][i].y-3, 7, 7);
                offg.drawString(Integer.toString(i+1),
                              point[point_num][i].x-3,
                              point[point_num][i].y-6);
            }
        }

        for(int i = 0; i < point.length; i++)     // 曲線描画
        {
            if(capture_mode_FLG && point_num == i)
                BezierCurve(offg, Color.blue, point[i]);
            else BezierCurve(offg, Color.black, point[i]);
        }

        g.drawImage(offi, 0, 0, this);
    }

    public void update(Graphics g)
    {
        paint(g);
    }
}