// Liang listing 14.3

import javax.swing.*;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Line2D;

public class TestPanelDrawing extends JFrame {

  public TestPanelDrawing() {
    add(new NewPanel());
  }

  public static void main(final String[] args) {
    final TestPanelDrawing frame = new TestPanelDrawing();
    frame.setTitle("TestPanelDrawing");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setSize(800, 800);
    frame.setLocationRelativeTo(null); // Center the frame
    frame.setVisible(true);
  }
}

class NewPanel extends JPanel {
  int w = 750;
  int h = 750;
  int scale = 200;
  int unitscale = 1;
  int x,y,x2,y2 = 0;
  int arrowsize = 50;
  int res = 1000;
  double[] xPoints = new double[res];
  double[] yPoints = new double[res];


  protected void paintComponent(Graphics g) {
    super.paintComponent(g);

    g.translate(400, 400);
    Graphics2D g2 = (Graphics2D) g;


    //draw function

    for(int n = -1000; n < 1000; n++){
        x2 = x;
        y2 = y;
        x = ((n)+w/2);
        y = (h/2-((n*n)/scale));
        g.drawLine(x2, y2, x, y);
    }

    // FILL ARRAY WITH VALUES
    for(int n = 0; n < res; ++n){
        xPoints[n] = n*unitscale;
        yPoints[n] = (Math.sin(((2*Math.PI)/360)*(n*unitscale)));
    }

    // SCALE VALUES ACCORDING TO SCALE INTEGER

    for(int n = 0; n < xPoints.length; n++) {
        xPoints[n] = xPoints[n];
        yPoints[n] = yPoints[n]*scale;
    }

    for(int n = 0; n < xPoints.length-1; n++) {
        g.drawLine((int) xPoints[n+1],(int) yPoints[n+1],(int) xPoints[n],(int) yPoints[n]);
    }
//    for(int n = -360; n < 360; n++){
//      x2 = x;
//      y2 = y;
//      x = n-360+h/2;
//      y = (int) (h/2-Math.sin(((2*Math.PI)/360)*(n*unitscale))*scale);
//      g.drawLine(x2, y2, x, y);
//    }


    g.drawLine(-w/2, 0, w/2, 0);    //x akse
    g.drawString("x", 0, w);        //x mærkat
//    g.drawLine(w, 0, w-arrowsize, arrowsize); //del af pil til x akse
//    g.drawLine(w, 0, w-arrowsize, arrowsize); //del af pil til x akse
    g.drawLine(0, -h/2, 0, h/2);    //y akse
    g.drawString("y", w/2, h);  //y mærkat
//    g.drawLine(w/2, h, w/2-arrowsize, h-arrowsize);   //del af pil til y akse
//    g.drawLine(200, 10, 210, 25);     //del af pil til y akse
    g.drawString("-2pi", -360/unitscale, 0);
    g.drawString("2pi", 360/unitscale, 0);
  }
}