import java.awt.event.*;
import javax.swing.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;

/**
 * This program demonstrates how to make and execute a display list. Note that
 * attributes, such as current color and matrix, are changed.
 * 
 * @author Kiet Le (Java conversion)
 */
public class List//
        extends JFrame//
        implements GLEventListener//
        , KeyListener//
{
    private int listName;

    public List() {
    }

    public static void main(String[] args) {
        GLCapabilities caps = new GLCapabilities();
        GLJPanel canvas = new GLJPanel(caps);
        List demo = new List();
        canvas.addGLEventListener(demo);
        canvas.addKeyListener(demo);

        JFrame.setDefaultLookAndFeelDecorated(true);
        JFrame frame = new JFrame("List");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(650, 50);
        frame.setLocationRelativeTo(null);

        frame.getContentPane().add(canvas);
        frame.setVisible(true);
        canvas.requestFocusInWindow();
    }

    public void init(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();
        //
        listName = gl.glGenLists(1);
        gl.glNewList(listName, GL.GL_COMPILE);
        gl.glColor3f(1f, 0f, 0f);
        gl.glBegin(GL.GL_TRIANGLES);
        gl.glVertex2f(0f, 0f);
        gl.glVertex2f(1f, 0f);
        gl.glVertex2f(0f, 1f);
        gl.glEnd();
        gl.glTranslatef(1.5f, 0f, 0f);
        gl.glEndList();
        gl.glShadeModel(GL.GL_FLAT);
    }

    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();
        //
        gl.glClear(GL.GL_COLOR_BUFFER_BIT);
        gl.glColor3f(0f, 1f, 0f);// has not affect
        for (int i = 0; i < 10; i++)
            gl.glCallList(listName);
        drawLine(gl); // * is this line green? NO! where is the line drawn?
        gl.glFlush();
    }

    public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) {
        GL gl = drawable.getGL();
        GLU glu = new GLU();
        //
        gl.glViewport(0, 0, w, h);
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glLoadIdentity();

        float aspect = 0f;
        if (w <= h) {
            aspect = (float) h / (float) w;
            glu.gluOrtho2D(0.0, 2.0, -0.5 * aspect, 1.5 * aspect);
        } else {
            aspect = (float) w / (float) h;
            glu.gluOrtho2D(0.0, 2.0 * aspect, -0.5, 1.5);
        }
        gl.glMatrixMode(GL.GL_MODELVIEW);
        gl.glLoadIdentity();
    }

    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
            boolean deviceChanged) {
    }

    private void drawLine(GL gl) {
        gl.glBegin(GL.GL_LINES);
        gl.glVertex2f(0f, 0.5f);
        gl.glVertex2f(15f, .05f);
        gl.glEnd();
    }

    public void keyTyped(KeyEvent arg0) {
    }

    public void keyPressed(KeyEvent key) {
        switch (key.getKeyCode()) {
        case KeyEvent.VK_ESCAPE:
            System.exit(0);
            break;

        default:
            break;
        }
    }

    public void keyReleased(KeyEvent arg0) {
    }
}