package gui;

/**

* RUN:

* javac -cp .; gui/SineWave.java && java -cp .; gui.SineWave

* OUTPUT:

*

*/

import java.io.*;

import java.util.*;

import javax.swing.*;

import javax.swing.event.*;

import java.awt.*;

import java.awt.event.*;

import net.mindview.util.*;

public class SineWave extends JFrame {

private static final int WIDTH = 700;

private static final int HEIHGT = 400;

private SineDraw sines = new SineDraw();

private JSlider adjustCycles = new JSlider(1, 30, 5);

public SineWave() {

add(sines);

adjustCycles.addChangeListener(new ChangeListener() {

public void stateChanged(ChangeEvent e) {

sines.setCycles(

((JSlider) e.getSource()).getValue()

);

}

});

add(BorderLayout.SOUTH, adjustCycles);

}

public static void main(String[] args) {

SwingConsole.run(new SineWave(), WIDTH, HEIHGT);

}

}

class SineDraw extends JPanel {

private static final int SCALEFACTOR = 200;

private int cycles;

private int points;

private double[] sines;

private int[] pts;

public SineDraw() {

setCycles(5);

}

public void paintComponent(Graphics g) {

super.paintComponent(g);

int maxWidth = getWidth();

double hstep = (double)maxWidth / (double)points;

int maxHeight = getHeight();

pts = new int[points];

for (int i =0; i < points; i++) {

pts[i] = (int) (sines[i]*maxHeight/2 * 0.95 + maxHeight/2);

}

g.setColor(Color.RED);

for(int i = 1; i < points; i++) {

int x1 = (int) ((i -1) * hstep);

int x2 = (int) (i * hstep);

int y1 = pts[i-1];

int y2 = pts[i];

g.drawLine(x1,y1, x2, y2);

}

}

public void setCycles(int newCycles) {

cycles = newCycles;

points = SCALEFACTOR * cycles * 2;

sines = new double[points];

for(int i = 0; i < points; i++) {

double radians = (Math.PI / SCALEFACTOR) * i;

sines[i] = Math.sin(radians);

}

repaint();

}

}