62 lines
1.7 KiB
Java
62 lines
1.7 KiB
Java
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//: gui/SineWave.java
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// Drawing with Swing, using a JSlider.
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import javax.swing.*;
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import javax.swing.event.*;
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import java.awt.*;
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import static net.mindview.util.SwingConsole.*;
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class SineDraw extends JPanel {
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private static final int SCALEFACTOR = 200;
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private int cycles;
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private int points;
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private double[] sines;
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private int[] pts;
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public SineDraw() { setCycles(5); }
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public void paintComponent(Graphics g) {
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super.paintComponent(g);
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int maxWidth = getWidth();
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double hstep = (double)maxWidth / (double)points;
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int maxHeight = getHeight();
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pts = new int[points];
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for(int i = 0; i < points; i++)
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pts[i] =
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(int)(sines[i] * maxHeight/2 * .95 + maxHeight/2);
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g.setColor(Color.RED);
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for(int i = 1; i < points; i++) {
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int x1 = (int)((i - 1) * hstep);
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int x2 = (int)(i * hstep);
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int y1 = pts[i-1];
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int y2 = pts[i];
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g.drawLine(x1, y1, x2, y2);
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}
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}
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public void setCycles(int newCycles) {
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cycles = newCycles;
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points = SCALEFACTOR * cycles * 2;
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sines = new double[points];
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for(int i = 0; i < points; i++) {
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double radians = (Math.PI / SCALEFACTOR) * i;
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sines[i] = Math.sin(radians);
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}
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repaint();
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}
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}
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public class SineWave extends JFrame {
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private SineDraw sines = new SineDraw();
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private JSlider adjustCycles = new JSlider(1, 30, 5);
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public SineWave() {
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add(sines);
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adjustCycles.addChangeListener(new ChangeListener() {
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public void stateChanged(ChangeEvent e) {
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sines.setCycles(
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((JSlider)e.getSource()).getValue());
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}
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});
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add(BorderLayout.SOUTH, adjustCycles);
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}
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public static void main(String[] args) {
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run(new SineWave(), 700, 400);
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}
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} ///:~
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