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Merge pull request #25 from BobHanson/yadav1
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‎sources/net.sf.j2s.core/dist/README.txt‎

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SwingJS distribution README.txt
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SwingJS distribution README.txt
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3/15/2018 Bob Hanson hansonr@stolaf.edu
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SwingJS has been successfully tested in Eclipse Neon and Oxygen on Mac and Windows platforms.
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(No reason to believe it would not also work for Linux; just haven't tried that recently.)
@@ -7,69 +9,147 @@ INSTALLATION INSTRUCTIONS
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Eclipse Neon or higher is necessary.
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1. net.sf.j2s.core_3.1.1.jar should be copied to the eclipse/dropins
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directory **AS net.sf.j2s.core.jar dropping the version info**
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because otherwise Eclipse will not recognize an update.
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-----------------------------------------------------------
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Installing the Java2Script transpiler as an Eclipse plug-in
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-----------------------------------------------------------
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The Java2Script transpiler for SwingJS is in net.sf.j2s.core.jar. It parses the .java code and
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creates .js files that match the standard .class files created by the Eclipse Java compiler.
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Note that both Java .class files (in bin/) and JavaScript .js files (in site/swingjs/j2s) are
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created automatically anytime you do any building of your project.
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1. Copy net.sf.j2s.core.jar from
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We do not know why this is necessary, but it appears to be. If you leave
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the version in the name, Eclipse will not be able to replace it with a
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newer version later. From what we can tell.
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https://github.com/BobHanson/java2script/blob/master/sources/net.sf.j2s.core/dist/dropins/net.sf.j2s.core.jar?raw=true
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On Mac systems, this directory is
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into your eclipse/dropins directory.
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Do not use net.sf.j2s.core_x.x.x.jar for this, as, if you do that, some versions of Eclipse will have to be
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entirely reinstalled every time you change versions. We do not know why this is necessary,
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but it appears to be. If you leave the version in the name, Eclipse will not be able to replace it with a
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newer version later. From what we can tell. So just always use dist/dropins/net.sf.j2s.core.jar.
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On Mac systems, the Eclipse directory is
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/Applications/Eclipse.app/Contents/Eclipse/dropins
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2. restart Eclipse and check for the presence of the plug-in at
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2. Restart Eclipse and check for the presence of the plug-in at
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help...about Eclipse...installation details...Plug-ins...(wait several seconds for tabulation)
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search for "j2s" to find j2s.sourceforge.net Java2Script Core
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If that is not there, you don't have net.sf.j2s.core.jar in the proper directory.
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3. Create an Eclipse Java project for your work, if you have not done so already.
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If your source code is not all already in src/, navigate to the project...properties...Java Build Path...source
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and add all the source directories you need.
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4. Create in the Eclipse project the file:
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----------------------------------
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Creating a new J2S/SwingJS project
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----------------------------------
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Create an Eclipse Java project for your work, if you have not done so already.
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If your source code is not all already in src/, navigate to the project...properties...
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Java Build Path...source and add all the source directories you need.
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Note that your project must not include any Jar file based dependencies.
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All source code must be available. (Source code from decompiling .class files will work.)
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---------------------------------------------------------------------
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Installing the SwingJS JavaScript version of the Java Virtual Machine
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---------------------------------------------------------------------
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All of the JavaScript produced will be in the project site/ directory.
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You must prepopulate this site with all the JavaScript required by the
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JavaScript version of the JVM. The most recent version of site/ is at
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https://github.com/BobHanson/java2script/blob/master/sources/net.sf.j2s.java.core/SwingJS-site.zip?raw=true
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Occasional additions to the java.* classes are made to the above-mentioned zip file.
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Simply download and unzip that file into your project, creating a top-level site/ directory.
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-------------------------------------------
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Enabling the Java2Script/SwingJS transpiler
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-------------------------------------------
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1. Create in your Eclipse project the file:
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.j2s
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containing simply:
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j2s.compiler.status=enable
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5. Modify the .project file to indicate the j2s transpiler is to be used,
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changing the buildSpec buildCommand from
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2. Edit the .project file to indicate that the j2s transpiler is to be used
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rather than the standard Java compiler by changing the buildSpec buildCommand from
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org.eclipse.jdt.core.javabuilder
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org.eclipse.jdt.core.javabuilder
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to
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net.sf.j2s.core.java2scriptbuilder
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6. All of the JavaScript produced will be in the project site/ directory.
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You must prepopulate this site with all the JavaScript required by the
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JavaScript version of the JVM. The most recent version of site/ is at
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https://github.com/BobHanson/java2script/blob/master/sources/net.sf.j2s.java.core/SwingJS-site.zip?raw=true
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--------------------
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Building the project
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--------------------
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Occasional additions to the java.* classes are made to the above-mentioned zip file.
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Build your project as you normally would. Java class files will be created as usual in the bin/ directory.
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JavaScript equivalents of these files will be created in the site/swingjs/j2s directory. You might have to
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do a project refresh to see these site files.
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Do take a look at the .js files created. You will notice that they are all the methods and fields of your
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Java project *except* final static constants. SwingJS does not recreate those by name; it just uses them.
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(The only thing this should affect is that java.lang.reflect.Field does not indicate these names.)
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----------------------------------------------
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Testing the JavaScript version of your project
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----------------------------------------------
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The J2S transpiler will automatically set up for you in site/ a sample HTML page for any class
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that subclasses JApplet or contains a public void main(String[] args) method. You will want to
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associate those files with an external HTML browser. We recommend Firefox.
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If you find you are missing a class, please contact me (Bob Hanson) at hansonr@stolaf.edu.
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You can try adding these yourself by **temporarily** adding one or more of the
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Java classes found at http://grepcode.com to the proper package. If you do that, be sure
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to use the OpenJDK version. Most of the code in the SwingJS project started with Java 6-b14 or 6-b27.
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Build your project, then delete these Java files, because you do not necessarily want your Java
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code using that version, just JavaScript.
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Since you will be running AJAX locally within these browsers, you may need to enable local
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file reading in your browser. Instructions for doing that can be found at
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http://wiki.jmol.org/index.php/Troubleshooting/Local_Files
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------------------------
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Adding more Java classes
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------------------------
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If you find you are missing a Java class, please contact me (Bob Hanson) at hansonr@stolaf.edu.
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You can try adding these yourself by **temporarily** adding one or more of the Java classes found
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at http://grepcode.com to the proper package in your project. For example, java/awt.
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If you do that, be sure to use the OpenJDK version. Most of the code in the SwingJS project started with
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Java 6-b14 or 6-b27. Build your project, then delete these Java files, because you do not necessarily
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want your Java code using that version, just JavaScript.
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----------------
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Working projects
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----------------
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A full site with many examples is at https://chemapps.stolaf.edu/swingjs/site
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Falstad applets are in https://github.com/BobHanson/SwingJS-Examples
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and appear at https://chemapps.stolaf.edu/swingjs/site
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VARNA development is at https://github.com/BobHanson/VARNA
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working site is https://chemapps.stolaf.edu/swingjs/varna
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Physlets development is at https://github.com/BobHanson/Physlets-SwingJS
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working site is https://chemapps.stolaf.edu/swingjs/physlets
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Phet applets have not been put on GitHub yet.
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As of Feb. 17, 2018, we are actively converting a variety of functioning Java applets.
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The physlets Animator, Doppler, and Optics are working.

‎sources/net.sf.j2s.core/dist/dropins/net.sf.j2s.core.jar‎

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‎sources/net.sf.j2s.core/dist/net.sf.j2s.core_3.1.1.jar‎

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‎sources/net.sf.j2s.core/src/net/sf/j2s/core/compiler/Java2ScriptCompiler.java‎

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@Override
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public boolean accept(File pathname) {
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//System.out.println("accept " + pathname + " " +pathname.isDirectory());
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return pathname.isDirectory() || !pathname.getName().endsWith(".java");
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}
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if (dir.equals(target))
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return;
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File[] files = dir.listFiles(filter);
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System.out.println("copy nonclassFiles " + dir + " to " + target + " [" + (files != null ? files.length : "") + "]");
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System.err.println("copy nonclassFiles " + dir + " to " + target + " [" + (files != null ? files.length : "") + "]");
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File f = null;
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if (files != null)
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try {

‎sources/net.sf.j2s.java.core/SwingJS-site.zip‎

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‎sources/net.sf.j2s.java.core/build_core_applet.xml‎

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</concat>
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<echo>copying srcjs files into site</echo>
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<copy todir="site/swingjs/js">
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<copy todir="site/swingjs">
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<fileset dir="srcjs"/>
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</copy>
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‎sources/net.sf.j2s.java.core/src/a2s/Applet.java‎

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import javax.swing.JApplet;
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import javax.swing.JPanel;
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@SuppressWarnings("serial")
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public class Applet extends JApplet implements A2SContainer {
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super.paintComponent(g);
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// System.out.println("init " + this.getSize());
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try {
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// The content pane's paintComponent method has not been overridden.
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// There may be no problem, but it also could mean that the applet
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// is not painting properly.
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if (this.getWidth() > 0)
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paintMe(g);
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paintComponent_(g);
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} catch (Throwable e) {
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System.out.println(e);
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System.out.println("There was a problem in Applet.paintComponent(g) " + e);
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e.printStackTrace();
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/**
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* @j2sNative
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*
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* debugger;
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*/
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{
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}
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}
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}
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});
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private boolean paintMeNotified;
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protected void paintMe(Graphics g) {
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protected void paintComponent_(Graphics g) {
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if (!paintMeNotified) {
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System.out.println("paintMe has not been implemented for " + this);
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System.out.println("JComponent.paintComponent(g) has not been overridden (including a super.paintComponent(g)) \nfor the " + this.getClass().getName() + " AWT applet.\nThis many be no problem, or it may mean the applet is not displaying properly.\n See https://docs.oracle.com/javase/tutorial/uiswing/painting/refining.html\n and https://docs.oracle.com/javase/tutorial/uiswing/painting/closer.html");
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paintMeNotified = true;
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}
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}

‎sources/net.sf.j2s.java.core/src/java/applet/Applet.java‎

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*/
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@Override
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public void resize(int width, int height) {
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if (appletViewer == null) {
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// no resizing if we have a stub -- embedded in a page
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if (stub == null)
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resizeOriginal(width, height);
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} else {
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// use J2S.Applet._resizeApplet.
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}
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public void resizeHTML(int width, int height) {
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if (appletViewer != null)
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appletViewer.html5Applet._resizeApplet(new int[] {width, height});
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}
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}
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@SuppressWarnings("deprecation")
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public void resizeOriginal(int width, int height) {
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Dimension d = size();

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