My presentation included some very handy code snippets, links and information so I decided to upload it to slideshare for anyone to catch up.

Please view the full post to see the Unity content.

We’ve also built a Facebook application version of this game, available to play at:
http://apps.facebook.com/minesweeper-game/

Thanks to phpxref, and the WordPress Codex, I managed to write a small useful function just for that. Without further ado, I present to you, the function:

function oy_get_direct_thumbnail_link( $post_id = NULL ) {
	global $id;
	$post_id = ( NULL === $post_id ) ? $id : $post_id;
	$src = wp_get_attachment_image_src(get_post_thumbnail_id($post_id), 'full');
	$src = $src[0];
	return $src;
}

The first and only parameter ($post_id) is optional. If used inside the loop, it fetches the current post’s ID by itself.

The lecture is in Hebrew but there are English subtitles available.

The service/application offers you six boxes in which you may type whatever you want. e.g. memos, notes, temporary data or tasks.

The data is saved within each keystroke one makes. It’s stored using the browser’s cookies.

Adding extra features always costs some of the simplicity of the application. And many people try to find the “right” balance. In this project, I decided to go to an extreme – super easy & no features. Some people may like it and some may not.

Here is my new personal homepage:
http://www.sixpacknotes.com/

Your feedback is welcomed.

Google Reader Play is a fast, fun way to browse interesting stuff on the web. No more looking for blogs, feeds, or sites — we’ll bring the best of the best directly to you via Reader Play.

The Best Of Web 2.0

I think I’ll be making more posts like this from time to time. Until then, don’t forget to have fun and remember – sharing is caring.

The Problem’s Symptoms

If you encountered any of these error messages when compiling a Box2d flash project:
b2World.as, Line 871 - 1046: Type was not found or was not a compile-time constant: Vector. - public function RayCastAll(point1:b2Vec2, point2:b2Vec2):Vector.
b2World.as, Line 917 - Warning: 3590: void used where a Boolean value was expected. The expression will be type coerced to Boolean. - return (m_flags & e_locked) > 0;
Input.as, Line 155 - Warning: 3590: void used where a Boolean value was expected. The expression will be type coerced to Boolean. - mouseReleased = !e.buttonDown;
Input.as, Line 189 - Warning: 3590: void used where a Boolean value was expected. The expression will be type coerced to Boolean. - return (keyState[k] > 0);
Input.as, Line 199 - Warning: 3590: void used where a Boolean value was expected. The expression will be type coerced to Boolean. - return (keyState[k] == 1);
Input.as, Line 208 - Warning: 3590: void used where a Boolean value was expected. The expression will be type coerced to Boolean. - return (keyState[k] == -1);
Input.as, Line 217 - Warning: 3590: void used where a Boolean value was expected. The expression will be type coerced to Boolean. - return (keyBuffer[i][0] == k && keyBuffer[i][1] <= t);
1046: Type was not found or was not a compile-time constant: b2PolygonDef. - var the_box:b2PolygonDef;
1067: Implicit coercion of a value of type Box2D.Collision:b2AABB to an unrelated type Box2D.Common.Math:b2Vec2. - the_world=new b2World(environment,gravity,true);
1137: Incorrect number of arguments. Expected no more than 2. - the_world=new b2World(environment,gravity,true);
1178: Attempted access of inaccessible property m_sprite through a reference with static type Box2D.Dynamics:b2DebugDraw. - debug_draw.m_sprite=debug_sprite;
1178: Attempted access of inaccessible property m_drawScale through a reference with static type Box2D.Dynamics:b2DebugDraw. - debug_draw.m_drawScale=30;
1178: Attempted access of inaccessible property m_fillAlpha through a reference with static type Box2D.Dynamics:b2DebugDraw. - debug_draw.m_fillAlpha=0.5;
1178: Attempted access of inaccessible property m_lineThickness through a reference with static type Box2D.Dynamics:b2DebugDraw. - debug_draw.m_lineThickness=1;
1178: Attempted access of inaccessible property m_drawFlags through a reference with static type Box2D.Dynamics:b2DebugDraw. - debug_draw.m_drawFlags=b2DebugDraw.e_shapeBit;
1180: Call to a possibly undefined method b2PolygonDef. - the_box = new b2PolygonDef();
1061: Call to a possibly undefined method CreateShape through a reference with static type Box2D.Dynamics:b2Body. - final_body.CreateShape(the_box);
1061: Call to a possibly undefined method SetMassFromShapes through a reference with static type Box2D.Dynamics:b2Body. - final_body.SetMassFromShapes();
1046: Type was not found or was not a compile-time constant: b2PolygonDef. - var the_box:b2PolygonDef;
1180: Call to a possibly undefined method b2PolygonDef. - final_body.CreateShape(the_box);
1061: Call to a possibly undefined method SetMassFromShapes through a reference with static type Box2D.Dynamics:b2Body. - final_body.SetMassFromShapes();
1136: Incorrect number of arguments. Expected 3. - the_world.Step(1/30, 10);
Warning: 3590: Box2D.Common.Math:b2Vec2 used where a Boolean value was expected. The expression will be type coerced to Boolean. - the_world=new b2World(environment,gravity,true);
1046: Type was not found or was not a compile-time constant: b2World. - public var the_world:b2World;
1046: Type was not found or was not a compile-time constant: b2AABB. - var environment:b2AABB = new b2AABB();
1046: Type was not found or was not a compile-time constant: b2Vec2. - var gravity:b2Vec2=new b2Vec2(0.0,10.0);
1046: Type was not found or was not a compile-time constant: b2DebugDraw. - var debug_draw:b2DebugDraw = new b2DebugDraw();
1046: Type was not found or was not a compile-time constant: b2Body. - var final_body:b2Body;
1046: Type was not found or was not a compile-time constant: b2BodyDef. - var the_body:b2BodyDef;
1046: Type was not found or was not a compile-time constant: b2PolygonDef. - var the_box:b2PolygonDef;
1180: Call to a possibly undefined method b2AABB. - var environment:b2AABB = new b2AABB();
1180: Call to a possibly undefined method b2Vec2. - var gravity:b2Vec2=new b2Vec2(0.0,10.0);
1180: Call to a possibly undefined method b2World. - the_world=new b2World(environment,gravity,true);
1180: Call to a possibly undefined method b2DebugDraw. - var debug_draw:b2DebugDraw = new b2DebugDraw();
1120: Access of undefined property b2DebugDraw. - debug_draw.m_drawFlags=b2DebugDraw.e_shapeBit;
1180: Call to a possibly undefined method b2BodyDef. - the_body = new b2BodyDef();
1180: Call to a possibly undefined method b2PolygonDef. - the_box = new b2PolygonDef();
1046: Type was not found or was not a compile-time constant: b2Body. - var final_body:b2Body;
1046: Type was not found or was not a compile-time constant: b2BodyDef. - var the_body:b2BodyDef;
1046: Type was not found or was not a compile-time constant: b2PolygonDef. - var the_box:b2PolygonDef;
1180: Call to a possibly undefined method b2BodyDef. - the_body = new b2BodyDef();
1180: Call to a possibly undefined method b2PolygonDef. - the_box = new b2PolygonDef();
1172: Definition Box2D.Dynamics could not be found. - import Box2D.Dynamics.*;
1172: Definition Box2D.Collision could not be found. - import Box2D.Collision.*;
1172: Definition Box2D.Collision.Shapes could not be found. - import Box2D.Collision.Shapes.*;
1172: Definition Box2D.Common.Math could not be found. - import Box2D.Common.Math.*;
I have the solution.

Possible Causes

There are two main causes for these type of errors:

1. The Box2d code you are compiling doesn't match the Box2d source files' version.
2. Flash can not locate the Box2d engine source files.

Version Difference

Personally, I first encountered the first cause. As it seems, when the Box2d guys updated their SVN and downloads for the latest version (for the time writing this post: 2.1 alpha aka 2.1a), they forgot to also update their code samples. So if one downloads the latest version and tries to compile the example projects, it simply won't work. Instead, flash will throw some of the errors listed above.

In addition, all of the online resources and tutorials regarding Box2D don't work with the latest Box2D version. I have yet to find an article or a code sample that works flawlessly with the latest version. They really rewrote major parts of the engine thus making lots of code (if not all) incompatible.

Missing Box2D files

The second cause is also very common. When compiling any project which uses the Box2d physics engine, Abobe must be able to find the needed Box2d source files. Adobe Flash looks for the files in the projects directory (is our case, for a Box2D subdirectory), and at the locations which one can specify in the preferences menu.

The Solutions

These solutions have solved my problems. If these won't help you, or if you have a better solution that you'd like to suggest - comment below.

Version Difference

As I've mentioned before, the examples in the latest Box2D download don't match the correct version and almost any code sample you will find online won't work with the latest version of Box2D.

Visit their full download page which contains all previous versions and download version 2.0.2. All the examples work great in this package. And any other code should also work using this version.

Missing Box2D files

Many times, Adobe Flash (also Flash Develop and any other Flash IDE) won't find the correct Box2D directory to use. As a result it will throw those errors.

To fix this, you have two options:

1. You can simply copy the correct Box2D source folder (a folder named Box2D) to the directory of your project. For instance, if your project lies under C:\projects\box2d-demo\demo.fla, you will need to copy the Box2D folder there. In the end the Box2D folder should lie at C:\projects\box2d-demo\Box2D.
2. The second option is to inform your IDE about the location of your Box2D folder. I use this option and I store my Box2D directory at C:\Documents and Settings\Oren Yomtov\My Documents\FlashUtilities\Box2D.

   To inform your IDE, follow the following steps:

   In Adobe Flash:

   1. Open your project in Adobe Flash.
   2. Navigate to "Edit->Preferences...".
   3. Click the "ActionScript" tab/category.
   4. Click the "ActionScript 3.0 Settings..." button.
   5. Click the "Browser To Path" (folder/cross icon) button under "Source path:".
   6. Browse to the folder which contains the Box2D folder and click "OK".
   7. Click "OK" twice to save the changes.

   In Flash Develop (If you use it):

   1. Open Flash Develop
   2. Navigate to "Project->Settings..."
   3. Click the "Classpaths" tab.
   4. Click the "Add Classpath..." button.
   5. Browse to the folder which contains the Box2D folder and click "OK".
   6. Click "OK" to save the changes.

   NOTE: If you use both, you will need to configure both.
   Do not browse directly to the Box2D folder. Instead, browse to it's parent folder.

Now recompile your code and it should all work.

By the way, if you are looking for video tutorials on the Box2D engine - check out Todd's great videos. They are very detailed and fun. Good luck.

Bookmark or favorite the following URL:javascript:var%20b=document.body;var%20GR________bookmarklet_domain='http://www.google.com';if(b&&!document.xmlVersion){void(z=document.createElement('script'));void(z.src='http://www.google.com/reader/ui/subscribe-bookmarklet.js');void(b.appendChild(z));}else{location='http://www.google.com/reader/view/feed/'+encodeURIComponent(location.href)}Using Google Chrome or Firefox, you can drag this link to your bookmarks bar – Subscribe.

Now, you may skip the RSS link seeking and simply click the link you have just bookmarked.

In my browser, Google Chrome, it looks like this:

If you want to check it out, feel free to give it a shot and subscribe to my blog.

The plugin now has better video detection capabilities, and a serious bug regarding the auto thumbnailing feature is fixed.

You can download the new version at:
http://wordpress.org/extend/plugins/youtube-thumbnailer/

Any bug reports, feature requests or comments are welcomed in the comments section below.

It has been quite a long time since I made the decision to move to the new domain. But there were two drawbacks which delayed the domain transfer. The first one is lack of time, and the second one is… Well, my laziness.

Anyways, I thought I would share some of the steps I took in order to move the website to the new domain. I was lucky enough that I didn’t have to change hosts. Doing that may have required some additional steps.

1. I bought the new domain and linked it to my hosting.
2. I downloaded the latest WordPress installation and uploaded it into the new domain by FTP (Looking for an FTP client?).
3. I copied the wp-content folder. And in my case, the “downloads” folder which is the folder I chose to store the uploads in (Default is wp-content/uploads).
4. I also copied the wp-config.php file and the .htaccess file.
5. I used the Search and Replace WordPress plugin to replace “orenyomtov.info” with “orenyomtov.com” in the database.
6. I notified Google of the domain change in Google Webmaster Tools.
7. I exported a new sitemap using the Google XML Sitemap Generator plugin and submitted it to Google Webmaster Tools.
8. I opened a new Google Analytics account and deployed the new tracking code in the theme I copied in step 3.
9. I edited the old .htaccess file to contain only:
   RewriteEngine on
RewriteRule (.*) http://orenyomtov.com/$1 [R=301,L]
10. I updated my FeedBurner account and all other similar services.
11. I updated my website to the new URL in all of my favorite social platforms (@orenyomtov) and forums.
12. Twit twit.
13. And then I began writing this post.

The move didn’t take as long as I expected it to take. Even though it does seem a little complicated after writing it all down.

I hope that your move will be as smooth as mine. Good luck, Oren.