Just a Lissajous curve on Java displayed on a JFrame.
You can find the complete code for this here:Lissajous.java.
First of all, the code is a complete rip-off fromThe Go Programming Language book, specifically from thiscode from chapter 1.
I won’t even pretend to understand the maths on this one, so lets just dive into the code, first we initialize our window:
int size = 100;JFrame frame = new JFrame("Lissajous");frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);JPanel panel = new JPanel();panel.setPreferredSize(new Dimension(2*size+1, 2*size+1));frame.add(panel);frame.pack();frame.setResizable(false);frame.setLocationRelativeTo(null);frame.setVisible(true);With that we have a non resizable JFrame on the middle of the screen, that terminates the program when closed which contains a JPanel where we can draw, in order to do so we only need the Graphics from the JPanel:
Graphics g = panel.getGraphics();Then we start shamelessly translating the Go code from the link above to Java:
double cycles = 5;double angularResolution = 0.001;long delay = 80;int frames = 64;for(;;){ double frequency = Math.random() * 3.0; float phase = 0.0f; for( int i = 0; i < frames; i++) { g.setColor(Color.BLACK); g.fillRect(0,0, panel.getWidth(), panel.getHeight()); g.setColor(Color.GREEN); for(double t = 0.0; t < cycles*2*Math.PI; t+= angularResolution){ double x = Math.sin(t); double y = Math.sin(t * frequency + phase); g.drawRect( (size + (int)(x*size+0.5)), (size + (int)(y*size+0.5)),1,1); } phase += 0.1; Thread.sleep(delay); }}Since its a single file, if we have Java 11 or above we can run it without compiling with:
java Lissajous.javaAnd we should see this:
Download the complete code for this here:Lissajous.java.
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