Transperancy and effeciency

Question

im posting here code that i got out of the internet on how to creat transperant window in C#.. try it , it looks cool and not too heavy on cpu..
Why doesnt java have somthing like that?, a true transperacny.. discuss.
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
namespace TransparentForms
    /// <summary>
    /// Summary description for Form2.
    /// </summary>
    public class Transparent : System.Windows.Forms.Form
        internal System.Windows.Forms.GroupBox GroupBox1;
        internal System.Windows.Forms.Button cmdApply;
        internal System.Windows.Forms.NumericUpDown udOpacity;
        internal System.Windows.Forms.Label Label1;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;
        public Transparent()
            // Required for Windows Form Designer support
            InitializeComponent();
            // TODO: Add any constructor code after InitializeComponent call
        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
            if( disposing )
                if(components != null)
                    components.Dispose();
            base.Dispose( disposing );
        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
            this.GroupBox1 = new System.Windows.Forms.GroupBox();
            this.cmdApply = new System.Windows.Forms.Button();
            this.udOpacity = new System.Windows.Forms.NumericUpDown();
            this.Label1 = new System.Windows.Forms.Label();
            this.GroupBox1.SuspendLayout();
            ((System.ComponentModel.ISupportInitialize)(this.udOpacity)).BeginInit();
            this.SuspendLayout();
            // GroupBox1
            this.GroupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                    this.cmdApply,
                                                                                    this.udOpacity,
                                                                                    this.Label1});
            this.GroupBox1.Location = new System.Drawing.Point(12, 75);
            this.GroupBox1.Name = "GroupBox1";
            this.GroupBox1.Size = new System.Drawing.Size(268, 116);
            this.GroupBox1.TabIndex = 4;
            this.GroupBox1.TabStop = false;
            // cmdApply
            this.cmdApply.Location = new System.Drawing.Point(172, 64);
            this.cmdApply.Name = "cmdApply";
            this.cmdApply.Size = new System.Drawing.Size(80, 24);
            this.cmdApply.TabIndex = 5;
            this.cmdApply.Text = "Apply";
            this.cmdApply.Click += new System.EventHandler(this.cmdApply_Click);
            // udOpacity
            this.udOpacity.Increment = new System.Decimal(new int[] {
                                                                        5,
                                                                        0,
                                                                        0,
                                                                        0});
            this.udOpacity.Location = new System.Drawing.Point(88, 32);
            this.udOpacity.Name = "udOpacity";
            this.udOpacity.Size = new System.Drawing.Size(48, 21);
            this.udOpacity.TabIndex = 4;
            this.udOpacity.Value = new System.Decimal(new int[] {
                                                                    50,
                                                                    0,
                                                                    0,
                                                                    0});
            // Label1
            this.Label1.Location = new System.Drawing.Point(20, 36);
            this.Label1.Name = "Label1";
            this.Label1.Size = new System.Drawing.Size(56, 16);
            this.Label1.TabIndex = 3;
            this.Label1.Text = "Opacity:";
            // Form2
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 14);
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.GroupBox1});
            this.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
            this.Name = "Form2";
            this.Text = "A Transparent Form";
            this.GroupBox1.ResumeLayout(false);
            ((System.ComponentModel.ISupportInitialize)(this.udOpacity)).EndInit();
            this.ResumeLayout(false);
        #endregion
        private void cmdApply_Click(object sender, System.EventArgs e)
            this.Opacity = (double)udOpacity.Value / 100;
        [STAThread]
        static void Main()
            Application.Run(new Transparent());
}

Answer 1

i used the jna api with jgl "java gl api" written by robin.. it is open source pure java implementation of open gl and glut calls. just google it and download the jar and save it to java/jre/lib/ext or ur classpath then compile this code and see transparent 3D graphics on ur desktop..
this code is one of the examples in jgl .. i just modified it to use JFrame and jna calls to add transperancy.
Bilal El Uneis
*  movelight.java
*  This program demonstrates when to issue lighting and
*  transformation commands to render a model with a light
*  which is moved by a modeling transformation (rotate or
*  translate).  The light position is reset after the modeling
*  transformation is called.  The eye position does not change.
*  A sphere is drawn using a grey material characteristic.
*  A single light source illuminates the object.
*  Interaction:  pressing the left mouse button alters
*  the modeling transformation (x rotation) by 30 degrees.
*  The scene is then redrawn with the light in a new position.
import java.awt.Frame;
import javax.swing.*;
import java.io.IOException;
import java.lang.String;
import java.lang.System;
import jgl.GL;
import jgl.GLUT;
import jgl.GLCanvas;
import com.sun.jna.examples.WindowUtils;
public class movelight extends GLCanvas {
    private int spin = 0;
     *  Initialize material property, light source, lighting model,
     *  and depth buffer.
    private void myinit () {
         myGL.glClearColor (0.0f, 0.0f, 0.0f, 0.0f);
     myGL.glShadeModel (GL.GL_SMOOTH);
     myGL.glEnable (GL.GL_LIGHTING);
     myGL.glEnable (GL.GL_LIGHT0);
     myGL.glEnable (GL.GL_DEPTH_TEST);
     *  Here is where the light position is reset after the modeling
     *  transformation (glRotated) is called.  This places the
     *  light at a new position in world coordinates.  The cube
     *  represents the position of the light.
    public void display () {
         float position [] = {0.0f, 0.0f, 1.5f, 1.0f};
     myGL.glClear (GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
     myGL.glPushMatrix ();
         myGLU.gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
         myGL.glPushMatrix ();
              myGL.glRotated ((double)spin, 1.0, 0.0, 0.0);
          myGL.glLightfv (GL.GL_LIGHT0, GL.GL_POSITION, position);
          myGL.glTranslated (0.0, 0.0, 1.5);
          myGL.glDisable (GL.GL_LIGHTING);
          myGL.glColor3f (0.0f, 1.0f, 1.0f);
          myUT.glutWireCube (0.1);
          myGL.glEnable (GL.GL_LIGHTING);
         myGL.glPopMatrix ();
         myUT.glutSolidTorus (0.275, 0.85, 8, 15);
     myGL.glPopMatrix ();
     myGL.glFlush ();
    public void myReshape (int w, int h) {
        myGL.glViewport (0, 0, w, h);
        myGL.glMatrixMode (GL.GL_PROJECTION);
        myGL.glLoadIdentity ();
     myGLU.gluPerspective (40.0, (float)w/(float)h, 1.0, 20.0);
        myGL.glMatrixMode (GL.GL_MODELVIEW);
        myGL.glLoadIdentity ();
    /* ARGSUSED2 */
    public void mouse (int button, int state, int x, int y) {
     switch (button) {
         case GLUT.GLUT_LEFT_BUTTON:
          if (state == GLUT.GLUT_DOWN) {
              spin = (spin + 30) % 360;
              myUT.glutPostRedisplay ();
          break;
         default:
          break;
    /* ARGSUSED1 */
    public void keyboard (char key, int x, int y) {
     switch (key) {
         case 27:
          System.exit(0);
         default:
          break;
    public void init () {
     myUT.glutInitWindowSize (500, 500);
     myUT.glutInitWindowPosition (0, 0);
     myUT.glutCreateWindow (this);
     myinit ();
     myUT.glutDisplayFunc ("display");
     myUT.glutReshapeFunc ("myReshape");
     myUT.glutMouseFunc ("mouse");
     myUT.glutKeyboardFunc ("keyboard");
     myUT.glutMainLoop ();
    static public void main (String args[]) throws IOException
         try
               System.setProperty("sun.java2d.noddraw", "true");
        }catch(Exception e){}
     final JFrame mainFrame = new JFrame ();
     mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     mainFrame.setSize (508, 527);
     movelight mainCanvas = new movelight ();
     mainCanvas.init();
     mainFrame.add (mainCanvas);
     WindowUtils.setWindowAlpha(mainFrame, .7f);
     mainFrame.setVisible (true);
}