JAVA - Polyline3

 

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package excercise13_12b;

import java.awt.BorderLayout;

import java.awt.Graphics;

import java.awt.Polygon;

import java.awt.Color;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Exercise13_12b extends JFrame {

public Exercise13_12b() {

setLayout(new BorderLayout());

add(new DrawSine(), BorderLayout.CENTER);

}

public static void main(String[] args) {

Exercise13_12b frame = new Exercise13_12b();

frame.setSize(400, 300);

frame.setTitle("Exercise13_12");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

class DrawSine extends JPanel {

double f(double x) {

    return Math.sin(x);

}

double gCos(double y) {

    return Math.cos(y);

}

protected void paintComponent(Graphics g) 

{

    super.paintComponent(g);

    g.drawLine(10, 100, 380, 100);

    g.drawLine(200, 30, 200, 190);

    g.drawLine(380, 100, 370, 90);

    g.drawLine(380, 100, 370, 110);

    g.drawLine(200, 30, 190, 40);

    g.drawLine(200, 30, 210, 40);

    g.drawString("X", 360, 80);

    g.drawString("Y", 220, 40);

    Polygon p = new Polygon();

    Polygon p2 = new Polygon();

   for (int x = -170; x <= 170; x++) {

        p.addPoint(x + 200, 100 - (int) (50 * f((x / 100.0) * 2

                * Math.PI)));

    }

    for (int x = -170; x <= 170; x++) {

        p2.addPoint(x + 200, 100 - (int) (50 * gCos((x / 100.0) * 2

                * Math.PI)));

    }

    g.setColor(Color.red);

    g.drawPolyline(p.xpoints, p.ypoints, p.npoints);

    g.drawString("-2\u03c0", 95, 115);

    g.drawString("-\u03c0", 147, 115);

    g.drawString("\u03c0", 253, 115);  

    g.drawString("2\u03c0", 305, 115);

    g.drawString("0", 200, 115);

    g.setColor(Color.blue);

    g.drawPolyline(p2.xpoints, p2.ypoints, p2.npoints);

  }

 }

}