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package glredbook11;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import javax.media.opengl.*;
import javax.swing.JFrame;
import glredbook10.GLSkeleton;
import javax.media.opengl.awt.GLJPanel;
import javax.media.opengl.glu.GLU;
/**
* When the left mouse button is pressed, this program reads the mouse position
* and determines two 3D points from which it was transformed. Very little is
* displayed.
*
* @author Kiet Le (Java port) Ported to JOGL 2.x by Claudio Eduardo Goes
*/
public class unproject//
extends GLSkeleton<GLJPanel>
implements GLEventListener, KeyListener, MouseListener {
private GLU glu;
private MouseEvent mouse;
@Override
protected GLJPanel createDrawable() {
GLCapabilities caps = new GLCapabilities(null);
//
GLJPanel panel = new GLJPanel(caps);
panel.addGLEventListener(this);
panel.addKeyListener(this);
panel.addMouseListener(this);
return panel;
}
public static void main(String[] args) {
unproject demo = new unproject();
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame frame = new JFrame("unproject");
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(demo.drawable);
frame.setVisible(true);
demo.drawable.requestFocusInWindow();
}
public void init(GLAutoDrawable drawable) {
// GL2 gl = drawable.getGL().getGL2();
glu = new GLU();
}
public void display(GLAutoDrawable drawable) {
GL2 gl = drawable.getGL().getGL2();
//
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
int viewport[] = new int[4];
double mvmatrix[] = new double[16];
double projmatrix[] = new double[16];
int realy = 0;// GL y coord pos
double wcoord[] = new double[4];// wx, wy, wz;// returned xyz coords
if (mouse != null) {
int x = mouse.getX(), y = mouse.getY();
switch (mouse.getButton()) {
case MouseEvent.BUTTON1:
gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
gl.glGetDoublev(GL2.GL_MODELVIEW_MATRIX, mvmatrix, 0);
gl.glGetDoublev(GL2.GL_PROJECTION_MATRIX, projmatrix, 0);
/* note viewport[3] is height of window in pixels */
realy = viewport[3] - (int) y - 1;
System.out.println("Coordinates at cursor are (" + x + ", "
+ realy);
glu.gluUnProject((double) x, (double) realy, 0.0, //
mvmatrix, 0,//
projmatrix, 0, //
viewport, 0, //
wcoord, 0);
System.out
.println("World coords at z=0.0 are ( " //
+ wcoord[0] + ", " + wcoord[1] + ", "
+ wcoord[2] + ")");
glu.gluUnProject((double) x, (double) realy, 1.0, //
mvmatrix, 0,//
projmatrix, 0,//
viewport, 0, //
wcoord, 0);
System.out
.println("World coords at z=1.0 are (" //
+ wcoord[0] + ", " + wcoord[1] + ", "
+ wcoord[2] + ")");
break;
case MouseEvent.BUTTON2:
break;
default:
break;
}
}
gl.glFlush();
}
/* Change these values for a different transformation */
public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) {
GL2 gl = drawable.getGL().getGL2();
//
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glLoadIdentity();
glu.gluPerspective(45.0, (float) w / (float) h, 1.0, 100.0);
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
boolean deviceChanged) {
}
public void keyTyped(KeyEvent key) {
}
public void keyPressed(KeyEvent key) {
switch (key.getKeyCode()) {
case KeyEvent.VK_ESCAPE:
System.exit(0);
break;
default:
break;
}
}
public void keyReleased(KeyEvent key) {
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
mouse = e;
super.refresh();
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void dispose(GLAutoDrawable arg0) {
}
}
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