import java.applet.Applet;
import java.awt.Graphics;
import java.awt.event.ComponentEvent;
import java.awt.event.ComponentListener;
import java.awt.event.InputEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

// must import jgl.GL....
import jgl.GL;
import jgl.GLAUX;

public class colormat extends Applet
		      implements ComponentListener, MouseListener {
    // must use GL to use jGL.....
    // and use GLAUX to use the aux functions.....
    // remember to give GL to initialize GLAUX
    GL myGL = new GL ();
    GLAUX myAUX = new GLAUX (myGL);

    private float diffuseMaterial [] = {0.5f, 0.5f, 0.5f, 1.0f};

    private void myinit () {
	float mat_specular[] = {1.0f, 1.0f, 1.0f, 1.0f};
	float light_position[] = {1.0f, 1.0f, 1.0f, 0.0f};

	myGL.glMaterialfv (GL.GL_FRONT, GL.GL_DIFFUSE, diffuseMaterial);
	myGL.glMaterialfv (GL.GL_FRONT, GL.GL_SPECULAR, mat_specular);
	myGL.glMaterialf (GL.GL_FRONT, GL.GL_SHININESS, 25.0f);
	myGL.glLightfv (GL.GL_LIGHT0, GL.GL_POSITION, light_position);

	myGL.glEnable (GL.GL_LIGHTING);
	myGL.glEnable (GL.GL_LIGHT0);
	myGL.glDepthFunc (GL.GL_LEQUAL);
	myGL.glEnable (GL.GL_DEPTH_TEST);

	myGL.glColorMaterial (GL.GL_FRONT, GL.GL_DIFFUSE);
	myGL.glEnable (GL.GL_COLOR_MATERIAL);
    }

    private void changeRedDiffuse () {
    	diffuseMaterial [0] += 0.1f;
	if (diffuseMaterial [0] > 1.0f) {
	    diffuseMaterial [0] = 0.0f;
	}
	myGL.glColor4fv (diffuseMaterial);
    }

    private void changeGreenDiffuse () {
    	diffuseMaterial [1] += 0.1f;
	if (diffuseMaterial [1] > 1.0f) {
	    diffuseMaterial [1] = 0.0f;
	}
	myGL.glColor4fv (diffuseMaterial);
    }

    private void changeBlueDiffuse () {
    	diffuseMaterial [2] += 0.1f;
	if (diffuseMaterial [2] > 1.0f) {
	    diffuseMaterial [2] = 0.0f;
	}
	myGL.glColor4fv (diffuseMaterial);
    }

    public void mouseClicked(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}

    public void mousePressed(MouseEvent e) {
        // process which button by myself
        if ((e.getModifiers() & InputEvent.BUTTON1_MASK)
            == InputEvent.BUTTON1_MASK) { // left
	    changeRedDiffuse ();
	    display ();
	    repaint ();
        } else if ((e.getModifiers() & InputEvent.BUTTON2_MASK)
                   == InputEvent.BUTTON2_MASK) { // middle
	    changeGreenDiffuse ();
	    display ();
	    repaint ();
        } else if ((e.getModifiers() & InputEvent.BUTTON3_MASK)
                   == InputEvent.BUTTON3_MASK) { // right 
	    changeBlueDiffuse ();
	    display ();
	    repaint ();
        }
        e.consume ();
    }

    private void display () {
	myGL.glClear (GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
	myAUX.auxSolidSphere (1.0);
	myGL.glFlush ();
    }

    public void componentMoved (ComponentEvent e) {}
    public void componentShown (ComponentEvent e) {}
    public void componentHidden (ComponentEvent e) {}

    public void componentResized (ComponentEvent e) {
	// get window width and height by myself
	myReshape (getSize ().width, getSize ().height);
	display ();
	repaint ();
    }

    private void myReshape (int w, int h) {
        myGL.glViewport (0, 0, w, h);
        myGL.glMatrixMode (GL.GL_PROJECTION);
        myGL.glLoadIdentity ();
        if (w <= h) {
            myGL.glOrtho (-1.5f,  1.5f, 
	    		  -1.5f*(float)h/(float)w, 
			   1.5f*(float)h/(float)w,
			 -10.0f, 10.0f);
        } else {
            myGL.glOrtho (-1.5f*(float)w/(float)h,
	    		   1.5f*(float)w/(float)h,
			  -1.5f,  1.5f,
			 -10.0f, 10.0f);
        }
        myGL.glMatrixMode (GL.GL_MODELVIEW);
	myGL.glLoadIdentity ();
    }

    public void update (Graphics g) {
    	// skip the clear screen command....
	paint (g);
    }

    public void paint (Graphics g) {
	myGL.glXSwapBuffers (g, this);
    }

    public void init () {
	myAUX.auxInitPosition (0, 0, 500, 500);
	myAUX.auxInitWindow (this);
	myinit ();

	// as call auxMouseFunc()
	addMouseListener(this);

	// as call auxReshapeFunc()
	addComponentListener (this);
	myReshape (getSize ().width, getSize ().height);

	// call display as call auxMainLoop(display);
        display ();
    }

}