package cg;
//------------------------------------------------------------------------------------------
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.JFrame;

import com.jogamp.opengl.GL2;
import com.jogamp.opengl.GLAutoDrawable;
import com.jogamp.opengl.GLEventListener;
import com.jogamp.opengl.awt.GLCanvas;
import com.jogamp.opengl.glu.GLU;
import com.jogamp.opengl.util.FPSAnimator;
//------------------------------------------------------------------------------------------
public class Main implements GLEventListener, KeyListener {

		final GLU glu = new GLU();
		float delta = 0.1f;
		static float camera_position[] = {0.0f, 0.0f, -10.0f};
		static float camera_orientation[] = {0.0f, 0.0f, 0.0f};
		float speed = 0.2f;
		float angle_incr = 1.0f;
//------------------------------------------------------------------------------------------		
		public static void main(String[] args) {

			GLCanvas canvas = new GLCanvas();
			canvas.addGLEventListener(new Main());
			
			canvas.addKeyListener(new Main());
			
			FPSAnimator animator = new FPSAnimator(canvas, 60);
			animator.start();
			final int width = 800;
		    final int height = 600;
			JFrame frame = new JFrame("OpenGL Fenster");
			frame.setSize(width, height);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.getContentPane().add(canvas);
			frame.setVisible(true);
			canvas.setFocusable(true);
		}
//------------------------------------------------------------------------------------------
	public void displayChanged(GLAutoDrawable arg0, boolean arg1, boolean arg2) {}
	@Override
	public void dispose(GLAutoDrawable drawable) {}
	//------------------------------------------------------------------------------------------
	@Override
	public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {

		final GL2 gl = drawable.getGL().getGL2();
		final float h = (float) width / (float) height;
		gl.glViewport(0, 0, width, height);	
		gl.glMatrixMode(GL2.GL_PROJECTION);	
		gl.glLoadIdentity();				
		glu.gluPerspective(45.0f, h, 1.0f, 100.0f);
		gl.glMatrixMode(GL2.GL_MODELVIEW);	
		gl.glLoadIdentity();				
	}
	//------------------------------------------------------------------------------------------
	@Override
	public void init(GLAutoDrawable drawable) {
		
		GL2 gl = drawable.getGL().getGL2();
		gl.glClearColor(0.1f, 0.3f, 0.8f, 1.0f);
		
		gl.glEnable(GL2.GL_CULL_FACE);
		gl.glEnable(GL2.GL_DEPTH_TEST);
	}
	//------------------------------------------------------------------------------------------
	@Override
	public void display(GLAutoDrawable drawable) {

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

		gl.glLoadIdentity();
        gl.glRotatef(camera_orientation[2], 0.0f, 0.0f, 1.0f);
        gl.glRotatef(camera_orientation[0], 1.0f, 0.0f, 0.0f);
        gl.glRotatef(camera_orientation[1], 0.0f, 1.0f, 0.0f);
		gl.glTranslatef(camera_position[0], camera_position[1], camera_position[2]);
		gl.glPushMatrix();
		gl.glTranslatef(0.0f, -1.0f, 0.0f);
		drawGround(gl);
		gl.glPopMatrix();
		gl.glPushMatrix();
		gl.glTranslatef(0.0f, 0.0f, 0.0f);
		drawCube(gl);
		gl.glPopMatrix();
	}
	//------------------------------------------------------------------------------------------
		void drawGround(GL2 gl) {
			gl.glBegin(GL2.GL_QUADS);
				gl.glVertex3f(-5.0f, 0.0f-delta, 5.0f);
				gl.glVertex3f( 5.0f, 0.0f-delta, 5.0f);
				gl.glVertex3f( 5.0f, 0.0f-delta,-5.0f);
				gl.glVertex3f(-5.0f, 0.0f-delta,-5.0f);
			gl.glEnd();
		}
		//------------------------------------------------------------------------------------------
				void drawCube(GL2 gl) {
					 gl.glBegin( GL2.GL_QUADS ); 

				      gl.glColor3f( 1f,0f,0f );   //red color
				      gl.glVertex3f( 1.0f, 1.0f, -1.0f ); // Top Right Of The Quad (Top)
				      gl.glVertex3f( -1.0f, 1.0f, -1.0f); // Top Left Of The Quad (Top)
				      gl.glVertex3f( -1.0f, 1.0f, 1.0f ); // Bottom Left Of The Quad (Top)
				      gl.glVertex3f( 1.0f, 1.0f, 1.0f ); // Bottom Right Of The Quad (Top)
				      
				      gl.glColor3f( 0f,1f,0f ); //green color
				      gl.glVertex3f( 1.0f, -1.0f, 1.0f ); // Top Right Of The Quad (Bottom) 
				      gl.glVertex3f( -1.0f, -1.0f, 1.0f ); // Top Left Of The Quad (Bottom)
				      gl.glVertex3f( -1.0f, -1.0f, -1.0f ); // Bottom Left Of The Quad (Bottom)
				      gl.glVertex3f( 1.0f, -1.0f, -1.0f ); // Bottom Right Of The Quad (Bottom)
				     
				      gl.glColor3f( 0f,0f,1f ); //blue color
				      gl.glVertex3f( 1.0f, 1.0f, 1.0f ); // Top Right Of The Quad (Front)
				      gl.glVertex3f( -1.0f, 1.0f, 1.0f ); // Top Left Of The Quad (Front)
				      gl.glVertex3f( -1.0f, -1.0f, 1.0f ); // Bottom Left Of The Quad (Front) 
				      gl.glVertex3f( 1.0f, -1.0f, 1.0f ); // Bottom Right Of The Quad (Front)
				      
				      gl.glColor3f( 1f,1f,0f ); //yellow (red + green)
				      gl.glVertex3f( 1.0f, -1.0f, -1.0f ); // Bottom Left Of The Quad (Back)
				      gl.glVertex3f( -1.0f, -1.0f, -1.0f ); // Bottom Right Of The Quad (Back)
				      gl.glVertex3f( -1.0f, 1.0f, -1.0f ); // Top Right Of The Quad (Back)
				      gl.glVertex3f( 1.0f, 1.0f, -1.0f ); // Top Left Of The Quad (Back)
				     
				      gl.glColor3f( 1f,0f,1f ); //purple (red + green)
				      gl.glVertex3f( -1.0f, 1.0f, 1.0f ); // Top Right Of The Quad (Left)
				      gl.glVertex3f( -1.0f, 1.0f, -1.0f ); // Top Left Of The Quad (Left)
				      gl.glVertex3f( -1.0f, -1.0f, -1.0f ); // Bottom Left Of The Quad (Left)
				      gl.glVertex3f( -1.0f, -1.0f, 1.0f ); // Bottom Right Of The Quad (Left)
				      
				      gl.glColor3f( 0f,1f, 1f ); //sky blue (blue + green)
				      gl.glVertex3f( 1.0f, 1.0f, -1.0f ); // Top Right Of The Quad (Right)
				      gl.glVertex3f( 1.0f, 1.0f, 1.0f ); // Top Left Of The Quad (Right)
				      gl.glVertex3f( 1.0f, -1.0f, 1.0f ); // Bottom Left Of The Quad (Right)
				      gl.glVertex3f( 1.0f, -1.0f, -1.0f ); // Bottom Right Of The Quad (Right)
				      
				      gl.glEnd();
				}
//----------------------------------------------------------------------------------------------------//
				@Override
				public void keyTyped(KeyEvent e) {
					int keyCo = e.getKeyCode();
					if (keyCo == KeyEvent.VK_A) {
						System.out.println("typed " + e.getKeyChar() + " button");
					}			
				}
				//------------------------------------------------------------------------------------------
				@Override
				public void keyPressed(KeyEvent e) {
					int keyCode = e.getKeyCode();
					if (keyCode == KeyEvent.VK_UP) {
						camera_position[2]+=speed;
					}
					if (keyCode == KeyEvent.VK_DOWN) {
						camera_position[2]-=speed;
					}
					else if (keyCode == KeyEvent.VK_LEFT) {
						camera_position[0]+=speed;
					}
					else if (keyCode == KeyEvent.VK_RIGHT) {
						camera_position[0]-=speed;
					}
					else if (keyCode == KeyEvent.VK_PAGE_UP) {
						camera_position[1]-=speed;
					}
					else if (keyCode == KeyEvent.VK_PAGE_DOWN) {
						camera_position[1]+=speed;
					}
					else if (keyCode == KeyEvent.VK_A) {
						camera_orientation[1] -= angle_incr;
						if (camera_orientation[1] < -360.0f) camera_orientation[1] += 360.0f;
					}
					else if (keyCode == KeyEvent.VK_D) {
						camera_orientation[1] += angle_incr;
						if (camera_orientation[1] > 360.0f) camera_orientation[1] -= 360.0f;
					}
					else if (keyCode == KeyEvent.VK_W) {
						camera_orientation[0] -= angle_incr;
						if (camera_orientation[0] < -360.0f) camera_orientation[0] += 360.0f;
					}
					else if (keyCode == KeyEvent.VK_S) {
						camera_orientation[0] += angle_incr;
						if (camera_orientation[0] > 360.0f) camera_orientation[0] -= 360.0f;
					}
					else if (keyCode == KeyEvent.VK_C) {
						camera_position[0] = 0.0f;
						camera_position[1] = 0.0f;
						camera_position[2] = -10.0f;
						
						camera_orientation[0] = 0.0f;
						camera_orientation[1] = 0.0f;
						camera_orientation[2] = 0.0f;
					}
				}
				//------------------------------------------------------------------------------------------
				@Override
				public void keyReleased(KeyEvent e) {
					int keyCode = e.getKeyCode();
					if (keyCode == KeyEvent.VK_DOWN) {
						System.out.println("released " + e.getExtendedKeyCode() + " button");
					}
				}			
}