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

public class Code8_2_impove extends JFrame{
	public static void main(String[] args){
	       new Code8_2_impove();
	}

	public Code8_2_impove(){
		//画面の設定
		setSize(500,500);
		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 class MyJPanel extends JPanel{

		//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 MyJPanel(){
			
		}

		public void paintComponent(Graphics g)
		{
			Dimension d; // dを宣言
			d=getSize();

			g.setColor(new Color(255, 0, 0));
			//軸の線分を書く
			g.drawLine(d.width/2,0,d.width/2,d.height); //y軸
			g.drawLine(0,d.height/2,d.width,d.height/2);//x軸
			//ｘ軸の文字を書く
			g.drawString("x",d.width-20,d.height/2-20);
			g.drawString("y",d.width/2-20,10); 

			g.setColor(Color.black);
			double x, step=2/100.0;
			int px,py, last_px,last_py;
			double x1,x2,y1,y2;

			last_px=-1; last_py=-1;
			//Draw Sin
			for (x=-3; x<3; x=x+step) {

				x1=x; y1=Math.sin(x);

				px=(int) x_change(x1, d.width, -3,3);
				py=(int) y_change(y1, d.height, -1,1);
				if (last_px > 0){
					g.drawLine(last_px,last_py,px,py);
				}
				last_px = px;
				last_py = py;
			}

			//Draw Cos
			g.setColor(Color.blue);
			
			last_px=-1; last_py=-1;
			for (x=-3; x<3; x=x+step) {

				x1=x; y1=Math.cos(x);

				px=(int) x_change(x1, d.width, -3,3);
				py=(int) y_change(y1, d.height, -1,1);
				if (last_px>0){
					g.drawLine(last_px,last_py,px,py);
				}
				last_px = px;
				last_py = py;
			}

		}
	}
}