import static org.lwjgl.opengl.GL11.*;
import java.util.Random;
import org.lwjgl.opengl.*;
import org.lwjgl.*;
import org.lwjgl.input.Keyboard;

public class Input {

	static int displayHeight = 480;
	static int displayWidth = 640;

	public Input() {
		try {
			Display.setDisplayMode(new DisplayMode(displayWidth, displayHeight));
			Display.setTitle("Input");
			Display.create();
		} catch (LWJGLException e) {
			e.printStackTrace();
		}


		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		glOrtho(0, displayWidth, displayHeight, 0, 1, -1);
		glMatrixMode(GL_MODELVIEW);

		Display.update();

		while (!Display.isCloseRequested()) {
			glClear(GL_COLOR_BUFFER_BIT);

			if (Keyboard.isKeyDown(Keyboard.KEY_ESCAPE)) {
				Display.destroy();
			}

			for(int i=1; i<=displayWidth; i+=10){
				Box.draw(i);
			}
			Display.update();
			Display.sync(60);
		}

		Display.destroy();

	}

	private static class Box {
		public static int height;

		public static void draw(int b) {
			Random randomHeight = new Random();
			height = randomHeight.nextInt(30) + 300;
			glBegin(GL_QUADS);
				glVertex2f(b, height); // Upper Left
				glVertex2f(b, displayHeight); // Bottom Left
				glVertex2f(b + 10, displayHeight); // Bottom Right
				glVertex2f(b + 10, height); // Upper Right
			glEnd();

		}

	}

    public static void main(String[] args) {
    	new Input();
    }
}