JAVA - POLYLINE

 

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package excercise13_12;

import java.awt.BorderLayout;

import java.awt.Graphics;

import java.awt.Polygon;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class Exercise13_12 extends JFrame {

public Exercise13_12() {

    setLayout(new BorderLayout());

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

}

public static void main(String[] args) {

    Exercise13_12 frame = new Exercise13_12();

    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 g(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();

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

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

                    * Math.PI)));

        }

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

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

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

        g.drawString("0", 200, 115);

    }

 }

}