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  • Best practices for periodically saving game state to disk

    - by Ben Morris
    I'm working on an MMO. All of the player and environment data lives on a server and is kept in memory. There's a "world" object which keeps track of all of the maps, characters, etc. and their relations to each other. To avoid data loss in case of a crash, I've been periodically serializing the world to disk. The trouble is, this object can be quite large, so when the server starts writing, there's noticeable in-game slowdown for a few seconds, which I'd like to avoid. Any pointers on how to go about this in a more efficient way?

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  • Handling Players, enemies and attacks in HTML5

    - by Chris Morris
    I'm building a simple (currently) game with free roaming player and monsters on a map built by a 2D grid. I've been looking at the methods for implementing characters and enemies onto the screen and I've seen two seperate methods for doing this online. Drawing the player onto the screen canvas directly and refreshing the entire screen every FPS tick. Having a separate canvas to handle the player and moving the player canvas on top of the screen canvas via absolute positioning. I can see some pros and cons of both methods but what is generally the best method for doing this? I assume the second due to not having to drain resources by refreshing the map when the user is not moving, but the type of game will generally have constant movement.

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  • Character movement on a 2D tile map

    - by Chris Morris
    I'm working at making a HTML5 game. Top down, closest thing I can equate it to is the gameboy zeldas, but open world and no rooms. What I have so far is a procedurally generated map in a multi dimensional array. And a starting position on the map. Along with this I have an array of movable and non movable tile ID's. I also have a class for my player and have him being rendered out in the center of the starting tile. My problem however is getting the movement sorted out for the player. I want to be able to have the character free move around the map (pixel by pixel essentially) ontop of this 2D generated world. Ideally this would allow the user to move around the walk able area of the canvas. this is simple enough for me to do, but I am having problems now moving the world. If the user is 20% from the edge of the screen i want the world to start panning in the direction the player is heading. But I'm rather lacking in ideas of how to do this. I've looked around for some tutorials, but am coming up blank on ideas of how to generate the playable area (zoomed in) and to then move this generated area under the player when they reach near the end of the screen. My current idea was to generate a certain amount of tiles full size to fill the screen and place the player i the middle. Then when the user approaches the edge of the screen start generating the tiles offset by the distance moved and the direction. I can kind of see this working but I really have no idea if this is the best or easiest to code of methods for generating the world. sorry for the lack of code but I'm still just in the theory stages of working this all out.

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  • How would the conversion of a custom CMS using a text-file-based database to Drupal be tackled?

    - by James Morris
    Just today I've started using Drupal for a site I'm designing/developing. For my own site http://jwm-art.net I wrote a user-unfriendly CMS in PHP. My brief experience with Drupal is making me want to convert from the CMS I wrote. A CMS whose sole method (other than comments) of automatically publishing content is by logging in via SSH and using NANO to create a plain text file in a format like so*: head<<END_HEAD title = Audio keywords= open,source,audio,sequencing,sampling,synthesis descr = Music, noise, and audio, created by James W. Morris. parent = home END_HEAD main<<END_MAIN text<<END_TEXT Digital music, noise, and audio made exclusively with @=xlink=http://www.linux-sound.org@:Linux Audio Software@_=@. END_TEXT image=gfb@--@;Accompanying image for penonpaper-c@right ilink=audio_2008 br= ilink=audio_2007 br= ilink=audio_2006 END_MAIN info=text<<END_TEXT I've been making PC based music since the early nineties - fortunately most of it only exists as tape recordings. END_TEXT ( http://jwm-art.net/dark.php?p=audio - There's just over 400 pages on there. ) *The jounal-entry form which takes some of the work out of it, has mysteriously broken. And it still required SSH access to copy the file to the main dat dir and to check I had actually remembered the format correctly and the code hadn't mis-formatted anything (which it always does). I don't want to drop all the old content (just some), but how much work would be involved in converting it, factoring into account I've been using Drupal for a day, have not written any PHP for a couple of years, and have zero knowledge of SQL? How might a team of developers tackle this? How do-able is it for one guy in his spare time?

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  • Android popup style activity which sits on top of any other apps

    - by RenegadeAndy
    What I want to create is a popup style application. I have a service in the background - something arrives on the queue and i want an activity to start to inform the user - very very similar to the functionality of SMSPopup app. So I have the code where something arrives on the queue and it calls my activity. However for some reason the activity always shows on top of the originally started activity instead of just appearing on the main desktop of the android device. As an example: I have the main activity which is shown when the application is run I have the service which checks queue I have a popup activity. When i start the main activity it starts the service - I can now close this. I then have something on the queue and it creates the popup activity which launches the main activity with the popup on top of it :S How do I stop this and have it behave as i want... The popup class is : package com.andy.tabletsms.work; import com.andy.tabletsms.tablet.R; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.View.OnClickListener; import android.view.ViewGroup; import android.widget.Button; import android.widget.PopupWindow; import android.widget.TextView; import android.widget.Toast; public class SMSPopup extends Activity implements OnClickListener{ public static String msg; @Override public void onCreate(Bundle bundle){ super.onCreate(bundle); // Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show(); this.setContentView(R.layout.popup); TextView tv = (TextView)findViewById(R.id.txtLbl); Intent intent = getIntent(); if (intent != null){ Bundle bb = intent.getExtras(); if (bb != null){ msg = bb.getString("com.andy.tabletsms.message"); } } if(msg == null){ msg = "LOLOLOL"; } tv.setText(msg); Button b = (Button)findViewById(R.id.closeBtn); b.setOnClickListener(this); } @Override public void onClick(View v) { this.finish(); } } and I call the activity from a broadcast receiver which checks the queue every 30 seconds or so : if(main.msgs.size()0){ Intent testActivityIntent = new Intent(context.getApplicationContext(), com.andy.tabletsms.work.SMSPopup.class); testActivityIntent.putExtra("com.andy.tabletsms.message", main.msgs.get(0)); testActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(testActivityIntent); } The layout is here : http://pastebin.com/F25u6wdM

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  • Replication with SQL Server 2005 Express Edition and SQL Compact Edition 3.5

    - by Andy Gable
    hi all, I need some information on SQL Server 2005 Express edition. What I want to do is have my central database servin local machine databases IE back office Cental database |------------------- Shop floor Terminal 1 |------------------- Shop Floor Terminal 2 |------------------- Shop Floor Terminal 3 |------------------- Shop Floor Terminal 4 |------------------- Shop Floor Terminal 5 |------------------- Shop Floor Terminal 6 I want is so that Shop floor terminals would PULL down ANY changes to the database as and when they happen (selected changes are needed change would be Add new item / Edit Item info that is used by Shop floor terminal (ie price, description, sale group) Is this possible with SQL 2005? I have the ability to make my own Sync Applciation but I would need to know what to look for in the database that trigers a update Many thanks for any advice you can give Andy

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  • Will increasing RAM improve Lightroom 3 large tiff loading times

    - by andy
    Set up: mid 2009 17" unibody MacBook Pro 4GB RAM 2.66 Core 2 Duo Snow Leopard 10.6.6 Lightroom 3 When working with 12 MegaPixel RAW files from a Nikon D700, no problem. Lightroom is fine. Recently I've been scanning film and they result in large tiff files, about 130mb each. The tiff files themselves are good, and I'm happy with my scanning workflow. Working with these files in Lightroom is perfectly fine, except for one step. When I choose one of these photos in the Develop module, Lightroom displays the "Loading" on the image for about a minute or two, which is quite long. Once the image is loaded, then everything is fine again, and applying effects is instant. So my only issue is reducing that "loading" time in the develop module (the library module is fine too). Will increasing my RAM to 8GB help? I'm worried about spending the money and it not making any difference. thanks andy

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  • Replication with SQL Server 2005 Express Edition and SQL Compact Edition 3.5

    - by Andy Gable
    I need some information on SQL Server 2005 Express edition. What I want to do is have my central database servin local machine databases IE back office Cental database |------------------- Shop floor Terminal 1 |------------------- Shop Floor Terminal 2 |------------------- Shop Floor Terminal 3 |------------------- Shop Floor Terminal 4 |------------------- Shop Floor Terminal 5 |------------------- Shop Floor Terminal 6 I want is so that Shop floor terminals would PULL down ANY changes to the database as and when they happen (selected changes are needed change would be Add new item / Edit Item info that is used by Shop floor terminal (ie price, description, sale group) Is this possible with SQL 2005? I have the ability to make my own Sync Applciation but I would need to know what to look for in the database that trigers a update Many thanks for any advice you can give Andy

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  • How can I do `dir *.mp3` in bash?

    - by Andy
    Hi all, On Windows I used to quickly run a dir *.mp3 to find all files with an mp3 extension in the current directory. Is there a similarly quick way to do it with bash? The ls command seems to have a way to ignore a pattern, but not to show only the pattern. I can do find . -maxdepth 1 -iname '*.mp3' or ls|grep -i '\.mp3$' but neither of these flow out of my fingers in half a second or less;) Any quicker alternatives? TIA Andy

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  • Can you reference an entire column in OpenOffice Calc (like A:A in Excel)?

    - by Andy
    I'd like to refer to an entire column, like you can in Excel by using A:A. I found a discussion on the openoffice.org forums which is a few years old, and suggests there is/was no neat way to do it. The options presented are Use A1:A65536. Use OFFSET($A$1;0;0;65536;1) as the previous range may get altered if you insert or remove rows. Use Data - Define Range... to name the column range (but which for me still just equates to $A$1:$A$1048576). These approaches seem over-complicated and still don't achieve my goal perfectly. Does anyone know of a way? Thanks, Andy

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  • sudo displays typed password in bash script

    - by Andy
    Hullo, I have a bash script that uses sudo a few times. There's a couple of strange points about it though. It asks me for my password a few seconds after I've already entered it for a previous command. The second time I enter my password, it's echoed to the display. Here's the relevant bits of the script. sudo service apache2 stop drush sql-dump --root="$SITE_DIR" --structure-tables-key=svn --ordered-dump | grep -iv 'dump completed on' | sudo tee "$DB_DIR/${SITE_NAME}.sql" > /dev/null sudo svn diff "$DB_DIR" | less sudo svn commit -m "$MESSAGE" "$DB_DIR" sudo service apache2 start The first password is to stop apache, and it works as expected. As mentioned, the sudo tee doesn't 'remember' that I have elevated privileges, asks for the password again, and echoes it to the screen. Given that tee is all about echoing to screen, I've played around a little with simple scripts which have | sudo tee, and they all work as expected. Ideas?! TIA Andy

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  • Metacity toggle fullscreen not working under Lucid; worked with Karmic.

    - by Andy
    Hi all, I'm working on a 11" screen, so I frequently want to use applications in fullscreen. I'm no expert on GNOME, but I remember doing a search a while back, and finding out about metacity, and how to use that to allow any window to be put in fullscreen. This worked great on Karmic, but it doesn't seem to be working under Lucid. Here's what I do. Run gconf-editor. Go to /apps/metacity/window_keybindings. Change toggle_fullscreen from disabled to <Control><Shift>F. Unfortunately it doesn't work. I know that I've got the right syntax because I can see other shortcuts and use them as a template. I have no idea what's wrong, and no idea how to move forwards/debug. Any suggestions much appreciated. TIA Andy

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  • How to reliably synchronise file servers between London and Shanghai?

    - by Andy S
    We have two offices, one in London and one in Shanghai, each needing to be able to access the same set of files. This means we need a solid, speedy means of synchronising a set of folders between servers at either office. They're likely to be Windows servers, but we could look at Linux boxes if the software side makes more sense on *nix. We've considered Rsync, Unison, Gluster, and a few other options, but none of them seem capable of reliably keeping the servers in sync between such distant office locations. Each office is on DSL connectivity over the open internet, so encryption is also a factor. Does anyone have any hints for getting the servers synchronising in as close to real time as possible, without dying constantly? Andy

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  • Can I make Firefox ignore/interpret font sizes specified in pixels?

    - by Andy
    Hi all, I have an 11.1" notebook display with 1366x768 resolution, which gives it a DPI of 141. I'm running GNOME and have configured the DPI. Everything works OK except web browsing - far too many websites specify their font sizes in pixels, which ends up with very small text on a high DPI display. My ideal solution would be for Firefox to interpret an absolute pixel size in terms of normal DPI and display it appropriately for my DPI (eg scale it by 141/96). Obviously this would cause problems on the occasion where graphics had been pixel-aligned with fonts in some way, but I imagine that would cause me far less of a headache than either reading minute text, or scaling the text manually each time. Any suggestions? TIA, Andy

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  • IIS configuration to publish files

    - by Andy.l
    I have a web service that will save a file that will be published externally through IIS. The idea was to use Webdav to save the file, but that would mean that the file could be altered externally as well. The idea is to have 2 website on the IIS server that I publish the file from. One site http://internalpublish.local/vfolder where vfolder points to a file share where the file would be saved through webdav. The other site would be http://externalpublish.com/vfolder where vfolder points to the same physical folder as on the internal site, but webdav is NOT enabled on this site. Would this cause any issues? Any feedback would be gratefully appreciated. /Andy.l

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  • In Which We Demystify A Few Docupresentment Settings And Learn the Ethos of the Author

    - by Andy Little
    It's no secret that Docupresentment (part of the Oracle Documaker suite) is powerful tool for integrating on-demand and interactive applications for publishing with the Oracle Documaker framework.  It's also no secret there are are many details with respect to the configuration of Docupresentment that can elude even the most erudite of of techies.  To be sure, Docupresentment will work for you right out of the box, and in most cases will suit your needs without toying with a configuration file.  But, where's the adventure in that?   With this inaugural post to That's The Way, I'm going to introduce myself, and what my aim is with this blog.  If you didn't figure it out already by checking out my profile, my name is Andy and I've been with Oracle (nee Skywire Software nee Docucorp nee Formmaker) since the formative years of 1998.  Strangely, it doesn't seem that long ago, but it's certainly a lifetime in the age of technology.  I recall running a BBS from my parent's basement on a 1200 baud modem, and the trepidation and sweaty-palmed excitement of upgrading to the power and speed of 2400 baud!  Fine, I'll admit that perhaps I'm inflating the experience a bit, but I was kid!  This is the stuff of War Games and King's Quest I and the demise of TI-99 4/A.  Exciting times.  So fast-forward a bit and I'm 12 years into a career in the world of document automation and publishing working for the best (IMHO) software company on the planet.  With That's The Way I hope to shed a little light and peek under the covers of some of the more interesting aspects of implementations involving the tech space within the Oracle Insurance Global Business Unit (IGBU), which includes Oracle Documaker, Rating & Underwriting, and Policy Administration to name a few.  I may delve off course a bit, and you'll likely get a dose of humor (at least in my mind) but I hope you'll glean at least a tidbit of usefulness with each post.  Feel free to comment as I'm a fairly conversant guy and happy to talk -- it's stopping the talking that's the hard part... So, back to our regularly-scheduled post, already in progress.  By this time you've visited Oracle's E-Delivery site and acquired your properly-licensed version of Oracle Documaker.  Wait -- you didn't find it?  Understandable -- navigating the voluminous download library within Oracle can be a daunting task.  It's pretty simple once you’ve done it a few times.  Login to the e-delivery site, and accept the license terms and restrictions.  Then, you’ll be able to select the Oracle Insurance Applications product pack and your appropriate platform. Click Go and you’ll see a list of applicable products, and you’ll click on Oracle Documaker Media Pack (as I went to press with this article the version is 11.4): Finally, click the Download button next to Docupresentment (again, version at press time is 2.2 p5). This should give you a ZIP file that contains the installation packages for the Docupresentment Server and Client, cryptically named IDSServer22P05W32.exe and IDSClient22P05W32.exe. At this time, I’d like to take a little detour and explain that the world of Oracle, like most technical companies, is rife with acronyms.  One of the reasons Skywire Software was a appealing to Oracle was our use of many acronyms, including the occasional use of multiple acronyms with the same meaning.  I apologize in advance and will try to point these out along the way.  Here’s your first sticky note to go along with that: IDS = Internet Document Server = Docupresentment Once you’ve completed the installation, you’ll have a shiny new Docupresentment server and client, and if you installed the default location it will be living in c:\docserv. Unix users, I’m one of you!  You’ll find it by default in  ~/docupresentment/docserv.  Forging onward with the meat of this post is learning about some special configuration options.  By now you’ve read the documentation included with the download (specifically ids_book.pdf) which goes into some detail of the rubric of the configuration file and in fact there’s even a handy utility that provides an interface to the configuration file (see Running IDSConfig in the documentation).  But who wants to deal with a configuration utility when we have the tools and technology to edit the file <gasp> by hand! I shall now proceed with the standard Information Technology Under the Hood Disclaimer: Please remember to back up any files before you make changes.  I am not responsible for any havoc you may wreak! Go to your installation directory, and locate your docserv.xml file.  Open it in your favorite XML editor.  I happen to be fond of Notepad++ with the XML Tools plugin.  Almost immediately you will behold the splendor of the configuration file.  Just take a moment and let that sink in.  Ok – moving on.  If you reviewed the documentation you know that inside the root <configuration> node there are multiple <section> nodes, each containing a specific group of settings.  Let’s take a look at <section name=”DocumentServer”>: There are a few entries I’d like to discuss.  First, <entry name=”StartCommand”>. This should be pretty self-explanatory; it’s the name of the executable that’s run when you fire up Docupresentment.  Immediately following that is <entry name=”StartArguments”> and as you might imagine these are the arguments passed to the executable.  A few things to point out: The –Dids.configuration=docserv.xml parameter specifies the name of your configuration file. The –Dlogging.configuration=logconf.xml parameter specifies the name of your logging configuration file (this uses log4j so bone up on that before you delve here). The -Djava.endorsed.dirs=lib/endorsed parameter specifies the path where 3rd party Java libraries can be located for use with Docupresentment.  More on that in another post. The <entry name=”Instances”> allows you to specify the number of instances of Docupresentment that will be started.  By default this is two, and generally two instances per CPU is adequate, however you will always need to perform load testing to determine the sweet spot based on your hardware and types of transactions.  You may have many, many more instances than 2. Time for a sidebar on instances.  An instance is nothing more than a separate process of Docupresentment.  The Docupresentment service that you fire up with docserver.bat or docserver.sh actually starts a watchdog process, which is then responsible for starting up the actual Docupresentment processes.  Each of these act independently from one another, so if one crashes, it does not affect any others.  In the case of a crashed process, the watchdog will start up another instance so the number of configured instances are always running.  Bottom line: instance = Docupresentment process. And now, finally, to the settings which gave me pause on an not-too-long-ago implementation!  Docupresentment includes a feature that watches configuration files (such as docserv.xml and logconf.xml) and will automatically restart its instances to load the changes.  You can configure the time that Docupresentment waits to check these files using the setting <entry name=”FileWatchTimeMillis”>.  By default the number is 12000ms, or 12 seconds.  You can save yourself a few CPU cycles by extending this time, or by disabling  the check altogether by setting the value to 0.  This may or may not be appropriate for your environment; if you have 100% uptime requirements then you probably don’t want to bring down an entire set of processes just to accept a new configuration value, so it’s best to leave this somewhere between 12 seconds to a few minutes.  Another point to keep in mind: if you are using Documaker real-time processing under Docupresentment the Master Resource Library (MRL) files and INI options are cached, and if you need to affect a change, you’ll have to “restart” Docupresentment.  Touching the docserv.xml file is an easy way to do this (other methods including using the RSS request, but that’s another post). The next item up: <entry name=”FilePurgeTimeSeconds”>.  You may already know that the Docupresentment system can generate many temporary files based on certain request types that are processed through the system.  What you may not know is how those files are cleaned up.  There are many rules in Docupresentment that cause the creation of temporary files.  When these files are created, Docupresentment writes an entry into a properties file called the file cache.  This file contains the name, creation date, and expiration time of each temporary file created by each instance of Docupresentment.  Periodically Docupresentment will check the file cache to determine if there are files that are past the expiration time, not unlike that block of cheese festering away in the back of my refrigerator.  However, unlike my ‘fridge cleaning tendencies, Docupresentment is quick to remove files that are past their expiration time.  You, my friend, have the power to control how often Docupresentment inspects the file cache.  Simply set the value for <entry name=”FilePurgeTimeSeconds”> to the number of seconds appropriate for your requirements and you’re set.  Note that file purging happens on a separate thread from normal request processing, so this shouldn’t interfere with response times unless the CPU happens to be really taxed at the point of cache processing.  Finally, after all of this, we get to the final setting I’m going to address in this post: <entry name=”FilePurgeList”>.  The default is “filecache.properties”.  This establishes the root name for the Docupresentment file cache that I mentioned previously.  Docupresentment creates a separate cache file for each instance based on this setting.  If you have two instances, you’ll see two files created: filecache.properties.1 and filecache.properties.2.  Feel free to open these up and check them out. I hope you’ve enjoyed this first foray into the configuration file of Docupresentment.  If you did enjoy it, feel free to drop a comment, I welcome feedback.  If you have ideas for other posts you’d like to see, please do let me know.  You can reach me at [email protected]. ‘Til next time! ###

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  • Sax Parser Character Array to Integer??

    - by Andy Barlow
    Hello, I am trying to get the contents of tags into variables in my java Sax parser. However, the Characters method only returns Char arrays. Is there anyway to get the Char array into an Int??? public void characters(char ch[], int start, int length) { if(this.in_total_results) { // my INT varialble would be nice here! } } Can anyone help at all? Kind regards, Andy

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  • tweepy documentation

    - by andy
    Hi everybody I just began working on a little twitter-app using tweepy. is there any kind of useful (and complete) documentation for tweepy? I googled like hell but didn't find anything. greetings, Andy

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  • integrating ckeditor

    - by Andy
    Hey guys, How to integrate ckeditor with mediawiki ....iam very new to this wiki thing ,...Can you plz guide me ...didnt find any worthful doc on web !!!! Cheers, Andy !

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  • CSShover.htc file fixes problems on IE and creates them in Chrome

    - by Andy
    Hi, I have attached a CSShover.htc file on my site to rectify the inherent problems in IE when creating a horizontal SPRYmenu in dreamweaver. The file has worked tremendously and displays fine on mozilla and IE. However on Chrome (my default browser) the menu skips accross the page by about 20px. The menu is quite wide in total at 975px. The menu still works on chrome but i would just like that the page displays the same on all browsers. Please help with your suggestions; Andy

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  • Dojo script (fx.xd.js) not working IE

    - by Andy Walpole
    Hi folks, I've been teaching myself Dojo over the last few days... However, if you look at the following page: http://www.mechanic-one.suburban-glory.com/ You'll see that the simple script in the header doesn't work in IE I get the following message: Message: 'duration' is null or not an object Line: 8 Char: 622 Code: 0 URI: htt p://ajax.googleapis.com/ajax/libs/dojo/1.3.2/dojo/fx.xd.js Do you have any ideas why this is so? Andy

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  • How to run Cg vertex/fragment shader on CPU?

    - by Andy
    Hi all, I'm playing about with some vertex and fragment shaders using Cg on my little netbook (running Linux). Clearly I'm going to frequently hit resource limits for my graphics controller, so was wondering if there's a nice way to run the shaders on the CPU, just to test them. Something like D3D's refrast... TIA Andy

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