package cg;
//--------------------------------------------------------------------------------
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import com.jogamp.opengl.*;
import com.jogamp.opengl.awt.*;

import com.jogamp.common.nio.Buffers;
import java.nio.FloatBuffer;
//--------------------------------------------------------------------------------
public class Main extends GLJPanel implements GLEventListener, KeyListener {

	private static final long serialVersionUID = 1L;
	//--------------------------------------------------------------------------------
	public static void main(String[] args) {
        JFrame window = new JFrame("Vertex Arrays - Würfel");
        Main panel = new Main();
        window.setContentPane(panel);
        window.pack();
        window.setLocation(50,50);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setVisible(true);
        panel.requestFocusInWindow();
    }
	//--------------------------------------------------------------------------------
    public Main() {
        super(new GLCapabilities(null));
        setPreferredSize(new Dimension(600,300));
        addGLEventListener(this);
        addKeyListener(this);
    }

    private double rotateX = 15;
    private double rotateY = -15;
    private double rotateZ = 0;
    //--------------------------------------------------------------------------------
							//	  v6----- v5
							//	 /|      /|
							//	v1------v0|
							//	| |     | |
							//	| v7----|-v4
							//	|/      |/
							//	v2------v3
    private float[] cubeCoords = {						// äußere Seiten im Gegenuhrzeigersinn beschrieben
            1,1,1,    -1,1,1,   -1,-1,1,   1,-1,1,      // v00[v0]-v01[v1]-v02[v2]-v03[v3] - vordere Fläche
            1,1,1,     1,-1,1,   1,-1,-1,  1,1,-1,      // v04[v0]-v05[v3]-v06[v4]-v07[v5] - rechte Fläche
            1,1,1,     1,1,-1,  -1,1,-1,  -1,1,1,       // v08[v0]-v09[v5]-v10[v6]-v11[v1] - obere Fläche
            -1,-1,-1, -1,1,-1,   1,1,-1,   1,-1,-1,     // v12[v7]-v13[v6]-v14[v5]-v15[v4] - hintere Fläche
            -1,-1,-1, -1,-1,1,  -1,1,1,   -1,1,-1,      // v16[v7]-v17[v2]-v18[v1]-v19[v6] - linke Fläche
            -1,-1,-1,  1,-1,-1,  1,-1,1,   -1,-1,1      // v20[v7]-v21[v4]-v22[v3]-v23[v2] - untere Fläche
    		};  
    
    private float[] cubeFaceColors = {
            1,0,0,  1,0,0,  1,0,0,  1,0,0,      // rot
            0,1,0,  0,1,0,  0,1,0,  0,1,0,      // grün
            0,0,1,  0,0,1,  0,0,1,  0,0,1,      // blau
            1,1,0,  1,1,0,  1,1,0,  1,1,0,      // gelb
            0,1,1,  0,1,1,  0,1,1,  0,1,1,      // türkis
            1,0,1,  1,0,1,  1,0,1,  1,0,1       // pink
            }; 
    //--------------------------------------------------------------------------------
    private FloatBuffer cubeCoordBuffer = Buffers.newDirectFloatBuffer(cubeCoords); 
    private FloatBuffer cubeFaceColorBuffer = Buffers.newDirectFloatBuffer(cubeFaceColors);  
    //--------------------------------------------------------------------------------
    public void display(GLAutoDrawable drawable) {    

        GL2 gl2 = drawable.getGL().getGL2();
        gl2.glClear( GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT );

        gl2.glLoadIdentity();
        gl2.glRotated(rotateZ,0,0,1);
        gl2.glRotated(rotateY,0,1,0);
        gl2.glRotated(rotateX,1,0,0);
        //--------------------------------------------------------------------------------
        gl2.glVertexPointer(3, GL2.GL_FLOAT, 0, cubeCoordBuffer);
        gl2.glColorPointer(3,GL2. GL_FLOAT, 0, cubeFaceColorBuffer);

        gl2.glEnableClientState(GL2.GL_VERTEX_ARRAY);
        gl2.glEnableClientState(GL2.GL_COLOR_ARRAY);

        gl2.glDrawArrays(GL2.GL_QUADS, 0, 24);
        
        gl2.glDisableClientState(GL2.GL_VERTEX_ARRAY);
        gl2.glDisableClientState(GL2.GL_COLOR_ARRAY);
    }
    //--------------------------------------------------------------------------------
    public void init(GLAutoDrawable drawable) {
        GL2 gl2 = drawable.getGL().getGL2();
        gl2.glMatrixMode(GL2.GL_PROJECTION);
        gl2.glOrtho(-4, 4, -2, 2, -2, 2);
        gl2.glMatrixMode(GL2.GL_MODELVIEW);
        gl2.glClearColor( 0.5F, 0.5F, 0.5F, 1 );
        gl2.glEnable(GL2.GL_DEPTH_TEST);
    }

    public void dispose(GLAutoDrawable drawable) {}

    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {}
    //--------------------------------------------------------------------------------
    public void keyPressed(KeyEvent evt) {
        int key = evt.getKeyCode();
        if ( key == KeyEvent.VK_LEFT )
            rotateY -= 15;
        else if ( key == KeyEvent.VK_RIGHT )
            rotateY += 15;
        else if ( key == KeyEvent.VK_DOWN)
            rotateX += 15;
        else if ( key == KeyEvent.VK_UP )
            rotateX -= 15;
        else if ( key == KeyEvent.VK_PAGE_UP )
            rotateZ += 15;
        else if ( key == KeyEvent.VK_PAGE_DOWN )
            rotateZ -= 15;
        else if ( key == KeyEvent.VK_HOME )
            {rotateX = 15; rotateY = -15; rotateZ = 0;}
        repaint();
    }

    public void keyReleased(KeyEvent evt) {}

    public void keyTyped(KeyEvent evt) {}
}