import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class Animation extends JFrame{

    public Animation(){
        //画面の設定
        setSize(700,700);
        setTitle("Java Programing");
                setDefaultCloseOperation(EXIT_ON_CLOSE);

        //パネルを貼り付ける
        MyJPanel    myJPanel= new MyJPanel();
        Container c = getContentPane();    //コンテナの取得
        c.add(myJPanel);        //パネルを貼る

       setVisible(true);
    }

    public static void main(String[] args){
        new Animation();
    }

    public class MyJPanel extends JPanel implements ActionListener{

        JButton doSmaller,doBigger;
        double last_x, last_y, x,y, parameter_t;

        public MyJPanel(){
            setBackground(Color.white);
            //setLayout(new GridLayout(2,10));
            doSmaller = new JButton("Small");
            doBigger = new JButton("Big");

            parameter_t = 1.0; //parameter_tによって、螺旋を変化する 　

            add(doSmaller);
            add(doBigger);
            doSmaller.addActionListener(this);    
            doBigger.addActionListener(this);    
        }


	//ｘ座標の変換
	public double  x_change(double x, double width, double x_min, double x_max){
		double new_x;
		new_x = (x - x_min)/(x_max - x_min) * width;
		return new_x;
	} 
	//y座標の変換
	public double  y_change(double y, double height, double y_min, double y_max){
		double new_y;
		new_y = (y - y_min)/(y_max - y_min) * height;
		new_y = height - new_y;
		return new_y;
	} 


        public void paintComponent(Graphics g){

            super.paintComponent(g); //画面クリアする。

            Graphics2D g2 = (Graphics2D) g;
            g2.setStroke(new BasicStroke(10));//描画の線分の幅を調整する。

            Dimension d;
     	    d = getSize();

            //write axis
            g.setColor(new Color(255, 0, 0));
            g.drawLine(0,d.height/2,d.width,d.height/2);
            g.drawLine(d.width/2,0,d.width/2,d.height);            
            g.drawString("x",d.width-20,d.height/2+10);
            g.drawString("y",d.width/2+10,10);

            //螺旋を描く
            double theta, theta_step=2*Math.PI/50;
            double r, r_step = 0.01;
            double x,y;
            int px, py, last_px, last_py;
            Color rand_color;
            r=0.0;theta=0.0;

            last_px = (int) x_change(0.0, d.width, -1,1);
            last_py = (int) y_change(0.0, d.height, -1,1);

            for(int k=0; k<1000;k+=1){
                   theta = theta + theta_step;
                   r = r+r_step * parameter_t; //parameter_tによって、螺旋の変化ができる。 　
                   x=Math.cos(theta)*r;
                   y=Math.sin(theta)*r;

                   if(Math.abs(x) >1 && Math.abs(y) >1) break;

                   px = (int) x_change(x, d.width, -1,1);
                   py = (int) y_change(y, d.height, -1,1);
                   
                   //色を乱数で設定する。
                   rand_color = new Color( (int)(Math.random()*256), (int)(Math.random()*256), (int)(Math.random()*256) );
                   g.setColor(rand_color);

                   g.drawLine(last_px, last_py, px, py);
                   last_px = px; 
                   last_py = py;

            }


	}

        public void actionPerformed(ActionEvent e) {
            if(e.getSource()==doSmaller)
            {
              parameter_t = parameter_t  - 0.01;
              repaint();
            }

            if(e.getSource()==doBigger)
            {
              parameter_t = parameter_t  + 0.01;
              repaint();
            }

        }

    }
}