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  • Raycasting tutorial / vector math question

    - by mattboy
    I'm checking out this nice raycasting tutorial at http://lodev.org/cgtutor/raycasting.html and have a probably very simple math question. In the DDA algorithm I'm having trouble understanding the calcuation of the deltaDistX and deltaDistY variables, which are the distances that the ray has to travel from 1 x-side to the next x-side, or from 1 y-side to the next y-side, in the square grid that makes up the world map (see below screenshot). In the tutorial they are calculated as follows, but without much explanation: //length of ray from one x or y-side to next x or y-side double deltaDistX = sqrt(1 + (rayDirY * rayDirY) / (rayDirX * rayDirX)); double deltaDistY = sqrt(1 + (rayDirX * rayDirX) / (rayDirY * rayDirY)); rayDirY and rayDirX are the direction of a ray that has been cast. How do you get these formulas? It looks like pythagorean theorem is part of it, but somehow there's division involved here. Can anyone clue me in as to what mathematical knowledge I'm missing here, or "prove" the formula by showing how it's derived?

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  • Camtasia Studio

    - by Andy Morrison
    Have you heard about this tool? This is a capture tool that records your actions as you perform them on your workstation, remote desktop, etc.  It's made by the same company that makes SnagIt, etc. http://www.techsmith.com/camtasia.asp I have used this at several customers to record our install and configurations of BizTalk and more - this can come in very handy to help reduce differences in environments (because you can go back and review exactly what you did in the previous environment) as well as to supplement your installation docs.   The product also includes an editing studio and various media types for export. I haven't been paid to write this - I just think the tool is very nice.

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  • Bring Gadgets back to Your Desktop in Windows 8 RTM with 8GadgetPack

    - by Asian Angel
    Are you someone who loved using desktop gadgets in Windows 7 and Vista, but felt disappointed when learning they were removed in Windows 8 RTM? Then 8GadgetPack is just the app to put those gadgets back on your desktop! The good folks over at 7 Tutorials have a nice little write-up about 8GadgetPack with all the details you need to get those gadgets up and running once again. Just browse on over using the link below… How to Use Desktop Gadgets in Windows 8 with 8GadgetPack [7 Tutorials] How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • Learning django by example source code (not examples)

    - by Bryce
    I'm seeking a nice complete open source django application to study and learn best practices from, or even use as a template. The tutorials only go so far, and django is super flexible which can lead one to paining themselves into a corner. Ideally such a template / example would: Ignore django admin, and implement full CRUD outside the admin. Be built like a large application in terms of best practices and patterns. Have a unit test Use at least one package (e.g. twitter integration or threaded comments) Implement some AJAX or Comet See also: Learning Django by example

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  • Doing two Declarative Operations with One Button

    - by shay.shmeltzer
    You can file the below video under "things that get asked on OTN a lot". With ADF it is very easy to drag an operation to a page to create a button that activate it. But what if you want a single button to invoke two operations? For example have a button that does a "Delete" as well as a "Commit". The way to do it is to add an action binding, and then overwrite the button function in a backing bean to call the additional action. The nice thing is that JDeveloper will create all the binding code for you in the backing bean - all you need to do is duplicate it. Here is a quick demo:

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  • Azure Boot Camp

    - by Brian Schroer
    Belated thanks to Perficient for sponsoring (and providing lunch, which was a nice unadvertised surprise) and to Avichal Jain and Brian Blanchard for presenting at the St. Louis Azure Boot Camp May 13-14. There was a little more upfront discussion of “What is Cloud Computing and Why is it important?” than I thought necessary (I would think that people signing up for a two-day Azure event would already be convinced that it’s a worthwhile thing), but we put on our boots and fired up Visual Studio soon enough. The good news for developers, as with most of Microsoft’s recent initiatives (e.g Silverlight and Windows Phone 7 development), is that you can leverage the skills you already have. If you’ve developed service-oriented applications, you’ve got a big head start. If a free Azure Boot Camp event is coming to your area (here’s the schedule), be sure to check it out. If not, you can download the slides and labs from their web site and “throw your own”.

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  • Unity 2d support dropped in 12.10, what now?

    - by tomodachi
    So its been announced. Ubuntu is dropping unity 2d support. I wouldn't mind if it wasn't for two things that are important to me. 1) A working system Unity is nice, i try to use it quite often. But it lags. 2) Support for older hardware. I also have old computers. You can imagine how they would work with unity if my current laptop is slog in Ubuntu. I guess i could use another desktop environment/ window manager , like switching to fluxbox. Anyone have any suggestion ideas/solutions on how to proceed with Ubuntu in the future? All insights welcome

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  • How to manage security cameras in Ubuntu?

    - by Josh
    I am setting up a server of sorts and chose ubuntu for the OS as my dad has it on a few computers. I am unimpressed with Windows or MAC due to all the add-ons and complexity of it when all I want is something simple. The system will have 3 purposes, storing my wife's photography work (she is a professional photographer) storing music for quick access to our entertainment system (will be running the system through the tv in our living room and thus through our surround sound) and will also serve as a DVR unit for a home security system I am going to put together. My question is what sort of software options are there for the Ubuntu system as far as a DVR with frame by frame playback. It does not need to be fancy but of course a variety of options are a nice touch.

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  • Why is the tooltip hiding Dash Search on 12.04?

    - by Anwar Shah
    Can I disable the tooltip shown at the side of the Launcher icon when hovered by the mouse. These are nice, but I want to disable them, because when I press "Dash Home" button on the launcher, then want to write something on the dash, I can't see the letters because of the tooltip. How can I disable the Unity tooltip from hiding search string in dash? I am using Ubuntu 12.04. I have given a screenshot of the launcher. My problem is basically with this Update 1 I have given advice to follow this answer in chat discussion, but nothing has changed. Update 2 As an answer suggests, I updated unity to the latest version. It is now unity 5.12.0. as the below output indicates $ unity --version unity 5.12.0

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  • MythTV GUI problems

    - by oli206
    Hi, I'm using MythTV to watch TV on my ubuntu computer and I'm having a problem with the resolution. It seems that the GUI resolution is matched with the channel resolution, so If I'm watching a HD channel, I get a nice GUI but If I'm watching a SD channel, then it's crap. A couple of screenshots to show the difference: High Definition Channel: Standard Definition Channel: I haven't found any similar issue in the internet and neither an option in the settings menu of MythTV (backend and frontend). I have another small problem that you can see in the first screenshot, the channel name is cut (it shows "Telemadri" and the last letter is not completely shown). Anyone know how can I fix this too? Thanks in advance

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  • What 'ordinary' packages does 'sudo apt-get purge wine*' removes?

    - by an_ant
    Ok, here's one silly question - I've actually run that command trying to lose configuraion of current installation of wine, so I can install it from zero. I didn't quite read but I've noticed that some packages that 'shouldn't be uninstalled' were getting uninstalled, like compiz for example... Now, my problem is that I don't know what are the other packages that got uninstalled. I can't enter Ubuntu at all. Help, please. Command was sudo apt-get purge wine*. Thank you. Please be nice; I was really tired :)

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  • Add an Image Properties Listing to the Context Menu in Chrome and Iron

    - by Asian Angel
    Is the lack of an Image Properties listing in the Context Menu of your favorite Chromium-based browser driving you crazy? If you have been missing this extremely useful function, then the Image Properties Context Menu extension is here to save the day. As soon as you get the extension installed you can start enjoying access to image property information as seen here. Very nice! Image Properties Context Menu [via Shankar Ganesh (@shankargan)] Latest Features How-To Geek ETC How To Make Hundreds of Complex Photo Edits in Seconds With Photoshop Actions How to Enable User-Specific Wireless Networks in Windows 7 How to Use Google Chrome as Your Default PDF Reader (the Easy Way) How To Remove People and Objects From Photographs In Photoshop Ask How-To Geek: How Can I Monitor My Bandwidth Usage? Internet Explorer 9 RC Now Available: Here’s the Most Interesting New Stuff Never Call Me at Work [Humorous Star Wars Video] Add an Image Properties Listing to the Context Menu in Chrome and Iron Add an Easy to View Notification Badge to Tabs in Firefox SpellBook Parks Bookmarklets in Chrome’s Context Menu Drag2Up Brings Multi-Source Drag and Drop Uploading to Firefox Enchanted Swing in the Forest Wallpaper

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  • How to capitalize maximally on location-independence … my personal #1-incentive for working as a developer

    - by SomeGuy
    To me the ultimate beauty in working as a developer is the fact that given a nice CV, your are going to find a new job, everywhere at any time. So I would like to ask if somebody here as experience in working while travelling for example. Or job-hopping from metropolis to metropolis every, say, six months. For example I have been investigating for how to get to Brazil. But it seems like that working as an employee in Brazil would be no option, b/c it takes a lot of time/money/effort to get the proper visas and permissions. So the only practical solution would be to freelance and the just travel, while getting your job done wherever you are. I bet my ass that there are loads of IT-guys out there and on here who know exactly what I am talking about. I'm looking forward to interesting ideas and stories.

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  • Script to embed image and CSS data in HTML files

    - by andreas-h
    I have a HTML page which references external stylesheets and shows some images. I'm looking for an easy way to include all referenced external resources in the HTML file directly, so that it doesn't have any external references any more. (Images should be included in the HTML file using the <img src="data:image/jpg;base64,[...] method). EDIT: I want to do this so that my web proxy can deliver a nice-looking error page if the backend is down, so I have to assume all my webservers cannot deliver the static content which would normally be linked to from my websites (CSS, images).

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  • Are technical books easy to read on the Kindle (or other small screens) [closed]

    - by Peter Recore
    Possible Duplicate: eBook editions of programming books I am considering getting a kindle or other e reader. (Kindle is my top choice for the eink vs lcd factor) I have been able to try reading fiction on a Kindle, and it seemed pretty nice, even with the small screen. However, most books I buy are actually technical books, which tend to have figures, code samples, and other odd things. How well do the various ereaders handle books like this? In particular, does the kindle render code samples or figures in an easy to read way?

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  • Convert DVD to MKV (et al) without transcoding/recompression

    - by Oli
    Like a lot of people, I have a lot of DVDs. But we also have a stupid amount of disk space and a media centre (Boxee) so the DVDs are getting less and less use. It would be nice to convert our DVDs into something more relevant to our needs. I've dabbled with DVD ripping before but whereas I'd usually transcode down to a smaller picture size with a better video compression algorithm, this takes a silly amount of time. I don't have a couple of hours available for each disk. (Sidebar: is there dedicated, Linux-friendly hardware to improve h264 encoding performance?) So I was wondering if there's anything that take the DVD filesystem, De-CSS it, and then stitch together any the VOBs that make up the main part of the film and package that up in a wrapping format like MKV. A bonus would be if it could grab the subtitles and stick them in too but that's not a requirement as Boxee can grab the subtitles online if it needs to.

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  • A good software development book

    - by Mahmoud Hossam
    I've searched this website, as well as SO for a question like that, and I still haven't found what I'm looking for. I'm looking for a book that is similar to Head First Software Development. I want to know more about the different stages of software development, I know about coding already, but I don't know much about unit testing, version control, integration, design...etc. P.S. it'd be nice if the book wasn't a thousand pages long. Edit: I'm looking for an introductory text, not a book about the latest trends in software development.

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  • To maximize chances of functional programming employment

    - by Rob Agar
    Given that the future of programming is functional, at some point in the nearish future I want to be paid to code in a functional language, preferably Haskell. Assuming I have a firm grasp of the language, plus all the basic programmer attributes (good communication skills/sense of humour/hygiene etc), what should I concentrate on learning to maximize my chances? Are there any particularly sought after libraries I should know? Alternatively, would another language be a better bet, say F#? (I'm not too fussed about the kind of programming work, so long as it's reasonably interesting and reasonably well paid, and with nice people)

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  • The Best Websites for Downloading Cool Wallpapers

    - by Lori Kaufman
    Getting bored with your desktop wallpaper or the wallpaper on your mobile device? Because we use our PCs and mobile devices so much, it’s nice to have a choice of cool backgrounds to look at. We’ve collected links to some sites where you can download wallpapers for your PC or your phone. Not all the wallpapers are free, but there are plenty of free ones to provide a variety of cool backgrounds. HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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  • Predicting advantages of database denormalization

    - by Janus Troelsen
    I was always taught to strive for the highest Normal Form of database normalization, and we were taught Bernstein's Synthesis algorithm to achieve 3NF. This is all very well and it feels nice to normalize your database, knowing that fields can be modified while retaining consistency. However, performance may suffer. That's why I am wondering whether there is any way to predict the speedup/slowdown when denormalizing. That way, you can build your list of FD's featuring 3NF and then denormalize as little as possible. I imagine that denormalizing too much would waste space and time, because e.g. giant blobs are duplicated or it because harder to maintain consistency because you have to update multiple fields using a transaction. Summary: Given a 3NF FD set, and a set of queries, how do I predict the speedup/slowdown of denormalization? Link to papers appreciated too.

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  • SSIS Expression Tester Tool

    - by Davide Mauri
    Thanks to my friend's Doug blog I’ve found a very nice tool made by fellow MVP Darren Green which really helps to make SSIS develoepers life easier: http://expressioneditor.codeplex.com/Wikipage?ProjectName=expressioneditor In brief the tool allow the testing of SSIS Expression so that one can evaluate and test them before using in SSIS packages. Cool and useful! Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!

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  • A good software development book [closed]

    - by Mahmoud Hossam
    I've searched this website, as well as SO for a question like that, and I still haven't found what I'm looking for. I'm looking for a book that is similar to Head First Software Development. I want to know more about the different stages of software development, I know about coding already, but I don't know much about unit testing, version control, integration, design...etc. P.S. it'd be nice if the book wasn't a thousand pages long. Edit: I'm looking for an introductory text, not a book about the latest trends in software development.

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  • Integrating PHPBB With DokuWiki

    - by Christofian
    I have a site with a phpbb forum. I'm working on adding a dokuwiki wiki to the site, and I would like to integrate the two. The phpbb forum is running phpbb 3.0.8, and the dokuwiki installation is running 2011-05-25a "Rincewind". Basically what I want is: for users to be able to log into the dokuwiki wiki with their phpbb account. Users should only be able to register from the phpbb registration interface. Cookie integration would be nice, but is not required. Is there any way to do this?

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  • Repeat row headers after Page Break

    - by klaus.fabian
    The lead developer of the FO engine send me by chance an email about a REALLY nice feature I did not know about. Did you ever encounter a long table with merged cells, where the merged cell went on to the next page? While column headers are by default repeated on the next page, row headers are not. Tables with group-left column and pivot tables are prime examples where this problem occurs. I have seen reports where merged cells could go over multiple pages and you would need to back to find the row header on previous pages. The BI Publisher RTF templates have a special tag you can added to a merged cell to repeat the contents after each page break. You just need to add the following (wordy) tag to the next merged table cell: true Example: 2nd page of report before adding the tag 2nd page of report after adding the tag. Thought you might want to know. Klaus

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  • Windows 8 Live Accounts and the actual Windows Account

    - by Rick Strahl
    As if Windows Security wasn't confusing enough, in Windows 8 we get thrown yet another curve ball with Windows Live accounts to logon. When I set up my Windows 8 machine I originally set it up with a 'real', non-live account that I always use on my Windows machines. I did this mainly so I have a matching account for resources around my home and intranet network so I could log on to network resources properly. At some point later I decided to set up Windows Live security just to see how changes things. Windows wants you to use Windows Live Windows 8 logins are required in order for the Windows RT account info to work. Not that I care - since installing Windows 8 I've maybe spent 10 minutes with Windows RT because - well it's pretty freaking sucky on the desktop. From shitty apps to mis-managed screen real estate I can't say that there's anything compelling there to date, but then I haven't looked that hard either. Anyway… I set up the Windows Live account to see if that changes things. It does - I do get all my live logins to work from Live Account so that Twitter and Facebook posts and pictures and calendars all show up on live tiles on the start screen and in the actual apps. That's nice-ish, but hardly that exciting given that all of the apps tied to those live tiles are average at best. And it would have been nice if all of this could be done without being forced into running with a Windows Live User Account - this all feels like strong-arming you into moving into Microsofts walled garden… and that's probably what it's meant to do. Who am I? The real problem to me though is that these Windows Live and raw Windows User accounts are a bit unpredictable especially when it comes to developer information about the account and which credentials to use. So for example Windows reports folder security like this: Notice it's showing my Windows Live account. Now if I go to Edit and try to add my Windows user account (rstrahl) it'll just automatically show up as the live account. On the other hand though the underlying system sees everything as my real Windows account. After I switched to a Windows Live login account and I have to login to Windows with my Live account, what do you suppose this returns?Console.WriteLine(Environment.UserName); It returns my raw Windows user account (rstrahl). All my permissions, all my actual settings and the desktop console altogether run under that account. If I look in TaskManager (or Process Explorer for me) I see: Everything running on the desktop shell with my login running under my Windows user account. I suppose it makes sense, but where is that association happening? When I switched to a Windows Live account, nowhere did I associate my real account with the Live account - it just happened. And looking through the account configuration dialogs I can't find any reference to the raw Windows account. Other than switching back I see no mention anywhere of the raw Windows account - everything refers to the Live account. Right then, clear as potato soup! So this is who you really are! The problem is that in some situations this schizophrenic account behavior gets a bit weird. Today I was running a local Web application in IIS that uses Windows Authentication - I tried to log-in with my real Windows account login because that's what I'm used to using with WINDOWS freaking Authentication through IIS. But… it failed. I checked my IIS settings, my apps login settings and I just could not for the life of me get into the site with my Windows username. That is until I finally realized that I should try using my Windows Live credentials instead. And that worked. So now in this Windows Authentication dialog I had to type in my Live ID and password, which is - just weird. Then in IIS if I look at a Trace page (or in my case my app's Status page) I see that the logged on account is - my Windows user account. What's really annoying about this is that in some places it uses the live account in other places it uses my Windows account. If I remote desktop into my Web server online - I have to use the local authentication dialog but I have to put in my real Windows credentials not the Live account. Oh yes, it's all so terribly intuitive and logical… So in summary, when you log on with a Live account you are actually mapped to an underlying Windows user. In any application if you check the user name it'll be the underlying user account (not sure what happens in a Windows RT app or even what mechanism is used there to get the user name info).  When logging on to local machine resource with user name and password you have to use your Live IDs even if the permissions on the resources are mapped to your underlying Windows account. Easy enough I suppose, but still not exactly intuitive behavior…© Rick Strahl, West Wind Technologies, 2005-2012Posted in Windows   Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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