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//: gui/SineWave.java

package gui; /* Added by Eclipse.py */

// Drawing with Swing, using a JSlider.

import javax.swing.*;

import javax.swing.event.*;

import java.awt.*;

import static net.mindview.util.SwingConsole.*;

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 * .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();

}

}

public class SineWave extends JFrame {

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) {

run(new SineWave(), 700, 400);

}

} ///:~