// Imports - So we can do stuff
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;

import javax.swing.JFrame;
import javax.swing.JPanel;

// Demonstration Class: CIRCLES
/*
 * Creates something that looks like this: http://www.local.t2ldev.com/circle.png
 */
public class Test extends JFrame {

    // Called by the JVM
    public static void main(String args[]){
        new Test("test"); // Create a new Demonstration
    }

    // Creates a new demonstration
    public Test(String s){
        setTitle(s); // The title
        setSize(new Dimension(500, 500)); // The size
        add(new Panel()); // Add a Panel Object (demonstration pane)
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // Actually kills the program when I hit "X"
        setVisible(true); // Display the demonstration
    }

    // Panel Object
    private class Panel extends JPanel {
        @Override
        // Paint Method
        public void paint(Graphics g){
            /*
            fillRect() is the lazy way to draw a point.
            */

            // Setup vars
            Point center = new Point(250, 250); // Our center point
            double radius = 100; // The radius
            g.setColor(Color.BLUE); // For the center point
            g.fillRect(center.x - 3, center.y - 3, 6, 6); // I minus 3 because I want the square to be 6 wide, but still in the correct location on screen
            g.setColor(Color.CYAN); // For the points
            for(int degree = 0; degree < 361; degree++){ // Loop through all possible degrees
                double x = center.x + (radius * Math.cos(degree)); // Get x. Formula: X = Cx + RCos(A)
                double y = center.y + (radius * Math.sin(degree)); // Get y. Formula: Y = Cy + RSin(A)
                g.fillRect((int) x - 3, (int) y - 3, 6, 6); // Draw the point on screen, again with the -3 stuff
                g.drawLine((int) x, (int) y, center.x - 3, center.y - 3); // Draw a fancy line from the point to the center.
            }
        }
    }
}