import java.awt.* ;
import java.lang.*;
public class sine extends Frame{
	public static void main(String arg[]) {
		MyFrame f = new MyFrame("sine curve");
		f.setSize(460, 230);     // JDK1.0.対応: f.resize(460, 230);
		MyCanvas cnv= new MyCanvas( );
		cnv.setSize(400, 200);   // JDK1.0.対応: cnv.resize(400, 200);
		cnv.setBackground(Color.white);
		cnv.setForeground(Color.darkGray);
		f.setLayout(new FlowLayout());
		f.add(cnv);
		f.show();
	}
}
class P{  // 異なる座標軸で同じ点を扱う
	int marg=10, xorg=0, yorg=100, width=400, height=200;
	double sx = 1.0, sy = 80.0;
	int x, y, u, v;
	public P(int u, int v){  // コンストラクタ
		this.u = u;
		this.v = v;
		UVtoXY();
	}
	public void UVtoXY(){
		x = xorg + marg + (int)(sx*(double)u);
		y = yorg + marg - (int)(sy*(double)v);
	}
	public void UVtoXY(double du, double dv){
		x = xorg + marg + (int)(sx*du);
		y = yorg + marg - (int)(sy*dv);
	}
}
class MyCanvas extends Canvas{          
	public void paint(Graphics g) {
		int i;
		double u, v, frq=2.0;
		P org = new P(0, 0);
		P x400 = new P(400, 0);
		P ypone = new P(0, 1);
		P ymone = new P(0, -1);
		g.drawLine(org.x, org.y, x400.x, x400.y);
		g.drawLine(ypone.x, ypone.y, ymone.x, ymone.y);
		P pold = new P(0, 0);
		P pnew = new P(0, 0);
// sine カーブを直線で近似する
		for(i = 0; i < 360 ; i=i+1) {
			u = (double)i;
			v = Math.sin(frq*u*Math.PI/180.0);
			pnew.UVtoXY(u, v);
			g.drawLine(pold.x, pold.y, pnew.x, pnew.y);
			pold.x = pnew.x; pold.y = pnew.y;
		}
	}
}