// 'import' statement - tell Java that we plan to use some of its
// pre-existing classes in our program
import java.awt.*;

public class DrawingExample {
    public static void main(String[] args) {
        // declare and initialize a DrawingPanel object
        //                                  width  height
        DrawingPanel panel = new DrawingPanel(300, 200);  // "constructing" an object
        
        /*
        <type> <name> = new <type> ( <parameters> );
         */
        
        // call a method on an object:
        // <variable name> . <method name> ( <parameters> );
        
        // call a static method:
        // <method name> ( <parameters );
        
        panel.setBackground(Color.MAGENTA);
        
        // Graphics object: a "pen" that can draw shapes on a window
        // getGraphics method 'returns' a value to our program
        Graphics g = panel.getGraphics();
        
        //          x   y  width  height
        g.setColor(Color.CYAN);
        g.fillRect(10, 20, 100, 80);
        g.fillRect(150, 30, 20, 50);
        
        g.setColor(Color.GREEN);
        g.fillRect(40, 120, 90, 15);
        
        g.setColor(Color.RED);
        g.fillOval(10, 10, 50, 50);
        
        g.setColor(Color.BLACK);
        g.drawRect(10, 10, 50, 50);
        g.drawOval(70, 80, 50, 30);
        
        g.drawLine(150, 30, 170, 80);
    }
}