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• How can I implement a Epub Reader in Javascript

  - by Vlad Nicula

  I'm wondering if I can create a epub reader in javascript. The basic requirements would be: 1) Server parts of the epub reader from a server API. 2) Read the EPUB data in javascript. 3) Render it on page. 4) Provide some extra functionality, like text highlights or page notes. I have no information about how I could do this. I'm willing to try a prototype project. What are the steps that I could take towards implementing such a thing?

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• Deciding On Features For Open Source

  - by Robz / Fervent Coder

  Open source feature selection is subjective. An interesting question was posed to me recently at a presentation - “How do you decide what features to include in the [open source] projects you manage?” Is It Objective? I’d like to say that it’s really objective and that we vote on features and look at what carries the most interest of the populace. Actually no I wouldn’t. I don’t think I would enjoy working on open source (OSS) as much if it someone else decided on what features I should include. It already works that way at work. I don’t want to come home from work and work on things that others decide for me unless they are paying me for those features. So how do I decide on features for our open source projects? I think there are at least three paths to feature selection and they are not necessarily mutually exclusive. Feature Selection IS the Set of Features For the Domain Your product, in whatever domain it is in, needs to have the basic set of features that make it answer the needs of that domain. That is different for every product, but if you take for example a build tool, at the very least it needs to be able to compile source. And these basic needed features are not always objective either. Two people could completely disagree what makes for a required feature to meet a domain need for a product. Even one person may disagree with himself/herself about what features are needed based on different timeframes. So that leads us down to subjective. Feature Selection IS An Answer To Competition Some features go in because the competition adds a feature that may draw others away from your product offering. With OSS, there are all free alternatives, so if your competition adds a killer feature and you don’t, there isn’t much other than learning (how to use the other product) to move your customers off to the competition. If you want to keep your customers, you need to be ready to answer the questions of adding the features your competition has added.  Sometimes it’s about adding a feature that your competition charges for, but you add it for free. That draws people to the free alternative – so sometimes that adds a motivation to select a feature. Sometimes it’s because you want those features in your product, either to learn how you can answer the question of how to do something and/or because you have a need for that feature and you want it in your product. That also leads us down the road to subjective. Feature Selection IS Subjective I decide on features based on what I want to see in the product I am working on. Things I am interested in or have the biggest need for usually get picked first, with things that do not interest me either coming later or not at all. Most people get interested in an area of OSS because it solves a need for them and/or they find it interesting. If one of these two things is not happening and they are not being paid, it’s likely that person will move on to something else they find interesting or just stop OSS altogether. OSS feature selection is just that – subjective. If it wasn’t, it wouldn’t be opinionated and it wouldn’t have a personality about it. Most people like certain OSS because they like where the product is going or the personalities behind the product. For me, I want my products to be easy to use and solve an important problem. If it takes you more than 5-10 minutes to learn how to use my product, I know you are probably going somewhere else. So I pick features that make the product easy to use and learn, and those are not always the simplest features to work on. I work for conventions and make the product opinionated, because I think that is what makes using a product easier, if it already works with little setup. And I like to provide the ability for power users to get in and change the conventions to suit their needs. So those are required features for me above and beyond the domain features. I like to think I do a pretty good job at this. Usually when I present on something I’ve created, I like seeing people’s eyes light up when they see how simple it is to set up a powerful product like UppercuT. Patches And/Or Donations But remember before you say I’m a bad person or won’t use my product, I’ll always accept patches or I might like the feature that you suggest. If you like using the products I provide and they solve a problem for you the two biggest compliments you can provide are either a patch or a donation.  If you think the product is great, but if it could do this one other thing, it would be awesome(!), then consider contacting me and providing a patch, or consider contacting me with a donation and a request to put the feature in. And alternatively, if it’s a big feature, you could hire me to work on the product to make it even better. What If There Are Multiple Committers? In the question of multiple committers, I choose that someone always makes the ultimate decision to select whether a feature should be part of a product or not. But for other OSS project maybe this is not the case. If there is not an ultimate decision maker, then there is the possibility of either adding every feature suggested or having a deadlock on two conflicting features.   So let me pose this question. If you work on Open Source, how do you decide on what features to put in your open source projects? How do you decide what doesn’t belong? What do you do when there are conflicting features?

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• Networking Client Server Packet logic (How they communicate)

  - by Trixmix

  I want to know what is the logic behind server client communication through packets for a real time game. for example the server sends x packets then the client receives x packets and processes them.. Basically what is the process to keep the client and server in sync and able to receive and send packets. more in depth example of what I want to know: client step 1 wait for a packet step 2 read x packets step 3 process x packets step 4 send x packets and so on... I need to know the very basic outline of the communication. Big questions are: 1) do I send and read packets all at one time? i.e for loop though the incoming packets array list and read them all or one every server loop or what... 2) what order should I do things i.e first receive then read then process then send etc.. 3) what I asked above a step by step of what the server / client should do.. Thanks!

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• Migration from XNA to SharpDX

  - by Wouter

  My fear is that XNA has reached the end of the road. To keep up with the latest technology a shift to another game framework might be needed. We have many games in a large codebase, all based on XNA. My question is, how much work would it be to migrate to SharpDX and are there other possibilities? Our code base mainly uses basic 3D rendering and the SpriteBatch, no fancy shader stuff. Update: I should have mentioned we only use 2.5D, we have a simple engine that builds textured quads to render text and animated sprites. Also for sound we use XACT (what else..) with some effects.

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• How can I create a partition without the usage of Live CD nor USB?

  - by Ariel

  ¿Cómo crear una partición sin usar live CD ni USB? Is it possible to create a partition when using the system? When I try to do it on gParted, it seems that the options are disabled because of the disk is mounted and it cannot be unmounted because of I am using it in the system. I wish to create a new partition without removing or affecting the file system; just creating a new partition, but without the need to use a Live CD or USB. ¿Es posible crear una partición estando en el sistema? Ya que cuando lo intento desde GParted, al parecer están desactivadas las opciones porque la unidad está montada y no se puede desmontar ya que estoy usando el sistema. Quiero crear una nueva partición pero sin quitar o afectar el sistema de archivos; sólo crear una nueva partición, pero sin live CD o USB.

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• How to teach computer science ?

  - by proferikson

  I am just starting to teach computer science. It's just the basic level. I'm finding that I sometimes don't know how to approach topics in a way that lets students easily understand. I've found that the best thing is to use analogies. A terrible one, that worked well, was presenting recursion by using the process of eating a burger. (You eat one bite, then you eat the rest). Interesting real world examples do wonders here. I'd like to know the techniques you have used for teaching, or teachers you've had have used that proved particularly effective. I'd also like to know your best analogies and examples for topics in CS101, especially for those harder to grasp topics. I'm teaching the class in Java (as required).

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• What exactly is UV and UVW Mapping?

  - by Michael Stum

  Trying to understand some basic 3D concepts, at the moment I'm trying to figure out how textures actually work. I know that UV and UVW mapping are techniques that map 2D Textures to 3D Objects - Wikipedia told me as much. I googled for explanations but only found tutorials that assumed that I already know what it is. From my understanding, each 3D Model is made out of Points, and several points create a face? Does each point or face have a secondary coordinate that maps to a x/y position in the 2D Texture? Or how does unwrapping manipulate the model? Also, what does the W in UVW really do, what does it offer over UV? As I understand it, W maps to the Z coordinate, but in what situation would I have different textures for the same X/Y and different Z, wouldn't the Z part be invisible? Or am I completely misunderstanding this?

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• Macbook Pro 8,2 Graphics switching - Ubuntu 12.04

  - by fgs

  I've been reading docs and various pages for a few hours now and can't seem to put all of the pieces together on this. Basically I am trying to get 12.04 installed on my MBP 8,2 with graphics card switching working in some way or another. My basic understanding is that I need to do an EFI boot install of ubuntu so that graphics card switching will work (due to the hardware design). From there I may be able to use one of the kernel modules for graphics switching: https://help.ubuntu.com/community/HybridGraphics That article isn't clear on whether I need to do an EFI install. I have also seen comments in posts here that say and EFI install works by default as long as you have refit installed. Overall, I'm quite lost as to the simplest way to proceed to get an install up and running with graphics switching. I don't mind using open source GFX drivers as long as the basics work. Any help towards a solution is greatly appreciated.

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• What is the best free program to burn DVD movies from DVD movie files that are present on the hard drive the way ImgBurn does it in Windows?

  - by cipricus

  Evaluating burning programs is difficult: it takes more time, while errors are very unpleasant. I have looked at AcetoneISO, Brasero, and K3B (which many recommend) but they seem more limited than Nero, CDBurnXP and especially ImgBurn from Windows. They all seem to work (did not tested them fully myself) but at a more basic level (create ISO, burn them, etc.). When it comes to something like creating a DVD movie disk from DVD movie files present on the hard drive, it seems to me that I would have to create the ISO first and then burn it, which involves using more hard drive space and more time. Looking in the Windows direction, there is a Nero for Linux. It costs money. ImgBurn is said to work well in Wine, but as yet I have not tested it enough. What other options are there?

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• Ubuntu install doesn't recognize kingston SSDnow sv 200 90g

  - by Quique Garcia

  I'm trying install Ubuntu 12.04 on my new Kingston SSD Now SVP200S3/90G, but the installer doesn't list this disk to be installed. However gparted let me do any partitioning operation correctly. I've tryed with Ubuntu Studio and Ubuntu Desktop on different machines: Lenovo ThinkPad T400, Lenovo ThinkStation C20, MoBo ASUS Crosshair V formula. SATA controller in all machines has been set to AHCI and IDE operation and different SATA ports with no luck. The firmware on the SSD has been updated to V.503xxx (latest on kingston page) Any help is appreciated, regards!

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• No SQLCompact Edition Support IN VS 2013

  - by James Izzard

  Firstly apologies if this is a poor question - I am an engineer not a programmer. I have spent time moving from Visual Basic to C#. I have started C#/SQL tutorials. I have noticed VS 2013 has stopped supporting the compact edition database normally used for standalone desktop apps. Somebody has kindly written a plugin to re-implement support. I have also noticed a belief circulating that SQLite is to replace the compact edition. Would anybody be able to advise if this was accurate - I am slightly confused as to which database is best suited for desktop app development inside VS 2013. Any comment greatly appreciated. Cheers James

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• Uploading a file automatically for speed test?

  - by Abhi

  I am building a Web UI for a device for internet connection and one of the requirements in it is a speed test. I know the basic concept of how speed test works. A file is downloaded for a limited time then the same file is uploaded again and the speed is tracked at regular intervals. Downloading the file is not an issue, but how am I supposed to upload the file without the client knowing that the file is getting uploaded? I've read through a lot of documentation, but I'm still not able to get the answer to how I will upload the file from clients machine without asking him to select the file.

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• Solaris 11 Live CD alapú telepítés

  - by AndrasF

  Az elozo részben megigért két telepítési eljárás helyett kénytelen vagyok ebben a bejegyzésben kizárólag a Live CD-s változattal foglalkozni. Korábban nem gondoltam, hogy ennek bemutatása is több, mint 50 képernyo kimenetet igényel, ezért változtatnom kellett a korábbi tervezeten. A Solaris 11 Live CD-s telepítés elsosorban az asztali (desktop) felhasználók igényeit veszi figyelembe és kizárólag x86-os architektúrájú gépeken támogatott (annak ellenére, hogy SPARC-os rendszerek is rendelkeznek grafikus kártyával - pl. T4-1).A folyamat két részre bontható: eloször a vendéggép kerül kialakítása VirtualBox környezetben, majd ezt követi a Solaris 11-es telepítése virtuális gépre. HCL és segédprogramok (DDT, DDU) Mielott telepíteni szeretnénk a Solaris operációs rendszert, célszeru tájékozódni fizikai rendszerünk támogatottságáról. Erre jól használható a már említett hardver kompatibilitási (HCL) lista, vagy az alábbi két segédprogram: Device Detection Tool Device Driver Utility Mindkét alkalmazás képes rendszerünk hardver komponenseit feltérképezni és ellenorizni azok meghajtóprogram (driver) ellátottságát. Eltérés köztük abban nyilvánul meg, hogy míg a DDT futtatásához Java szükséges, addig a DDU Solarist igényel. Ez utóbbiról a telepítés során röviden szó fog esni. Telepíto készletek letöltési helye Hálózati installációtól eltekintve (*) telepítokészletre van szükségünk, mely az alábbi oldalról töltheto le. Célszeru letöltenünk mindhárom állományt és a csomagokat tartalmazó ún. repository médiát (a következo felsorolás utolsó eleme) is: sol-11-1111-live-x86.iso sol-11-1111-text-x86.iso sol-11-1111-ai-x86.iso sol-11-1111-repo-full.iso Az elso három változat indítható USB formátumban is rendelkezésre áll - ekkor iso végzodés helyett usb található a fájlnevek végén. Rövid utalást az egyes készletek feladatáról az elozo blog bejegyzés tartalmaz (link). Amennyiben SPARC architektúrájú rendszerre szeretnénk a telepítést végezni, 'x86' helyett a 'sparc' szöveget tartalmazó állományokra lesz szükség. (*) - arra is lehetoség van, hogy AI készletrol történo indítás segítségével végezzük a hálózaton keresztül történo telepítést. Ez akkor fontos, ha célgépünkön nincs PXE (Preboot Execution Environment) boot támogatás. VirtualBox konfigurálás Külön fizikai eszköz felhasználása nélkül virtuális környezetben is használható a Solaris 11, mint vendéggép. A VirtualBox használatával erre kényelmes lehetoség kínálkozik. Gazdagépünknek (Windows, Unix, Linux) megfelelo telepíto program, vagy programcsomag (jelenleg a 4.1.16-os verzió a legfrissebb változat) és az installációt is taglaló felhasználói kézikönyv letöltheto a termék oldaláról. A sikeres telepítést követoen az alábbi lépések során jutunk el az új virtuális gép kialakulásáig: 1. A VBox indítása után a központi ablak megmutatja a már létezo virtuális gépeinket (Sol11demo, Sol11u1b07, Sol11.1B16, Sun_ZFS_Storage_7000) és az aktuálisan kiválasztott egyed (Sol11demo) fobb jellemzoit (megnevezés, memória mérete, virtuális tároló eszközök listája...stb.) 2. A New gombra kattintva elindul a virtuális gépet létrehozó segéd (wizard) 3. Ezt követoen nevet kell adnunk a vendéggépnek és ki kell választanunk az operációs rendszer típusát (beszédes név használata esetén a VirtualBox képes az operációs rendszer családját kiválasztani, nekünk pusztán csak verziót kell beállítanunk): adjuk meg Solaris11-et névként és válasszuk a 64bites változatot (feltéve, hogy gazdagépünk támogatja ezt) 4. Telepítéshez és a kezdeti lépések megtételéhez 1536MB memória tökéletesen megfelel (ez késobb módosítható az elvárások függvényében) 5. Fizikai társaihoz hasonlóan, egyetlen virtuális gép sem létezhet merevlemez (jelen esetben virtuális diszk) nélkül. Használhatunk egy már létezo területet (virtuális lemezt tartalmazó állomány), de létrehozhatunk egy nekünk tetszo új példányt is. Maradjunk ez utóbbinál (Create new hard disk)! 6. A lehetséges formátumok közül - az egyszeruség okán - éljünk a felkínált alaptípussal (VDI - VirtualBox Disk Image). 7. Létrehozás során a virtuális lemez készülhet egyidejuleg (Fixed size), vagy több lépésben dinamikusan (Dynamically allocated). Az elso változat sokkal kevésbé terheli a rendszert, a második elonye pedig a helytakarékosság. Válasszuk a fix méretu változatot. 8. Most már csak egyetlen adat ismeretlen a VirtualBox számára, mégpedig a létrehozásra kerülo virtuális lemez nagysága. 8GB-os terület jelen esetben alkalmas az ismerkedés elkezdéséhez. 9. Amennyiben minden beállítást helyesen adtunk meg, a Create gomb megnyomása után elindul a virtuális lemez létrehozása. 10. Ez a muvelet a megadott adatoktól függoen néhány perc alatt befejezodik. 11. Hasonló megerosítés (Create gomb aktiválása) után elkezdodik a kért virtuális gép létrehozása is. 12. Sikeres végrehajtás után az új vitruális gép közvetlenül megjelenik a központi ablak baloldali listáján a rendelkezésre álló virtuális gépek közt. A blog bejegyzés folyamatosan frissül...a rész fennmaradó tartalma hamarosan felkerül az oldalra.

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• Ubuntu 12.04.3 alongside Windows 8.1

  - by user208329

  I brought a new Notebook which has pre-installed Windows 8.1 with an uefi* (-Bios) and secure boot*. (* can switch or turn so off, still no success) When i try to install Ubuntu 12.04.3, the installer doesn't recognize Windows 8.1. There were options, to delete the whole disk or do something else. The second option, shows a few partitions (NTFS) but no Windows. The Ubuntu 13.10 version even did start on my notebook, it gets frozen during start up. (I thought. maybe the newer one will recognize Windows.) I'm not very confident in manipulating grub, I hope there is an easy way or an easy description. Gparted shows: Device Type Size Used /dev/sda freespace 1MB /dev/sda ntfs 1073MB 408MB /dev/sda2 efi 104MB 52MB /dev/sda3 ntfs 134MB 45MB /dev/sda4 ntfs 988465MB 23947MB /dev/sda5 ntfs 10424MB 9483MB free space 0MB /dev/sdb1 fat32 16929MB 9412MB (USB-drive Ubuntu-image)

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• What should be a fair amount of time in an interview before rejecting a candidate?

  - by Danish

  As a panelist for technical interviews, you often come across candidates who have all the requried educational qualifications, skill sets and experience level on resumes, but struggle to answer even the most basic questions. Ideally, technical interviews should try to check different aspects of a candidate and test them on various skills. So, if the candidate falters on one aspect, one should test the other ones before coming to a conclusion. But often, if a candidates falters on the first few questions, the red flag rises up pretty quickly. What in your opinion should be the bare minimum time spent with a candidate before making a fair accessment of his/her skills and suitability for the job?

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• Tools for assembling textures into DDS files

  - by Nicol Bolas

  There are plenty of tools for making images. I'm not looking for one of those; I have many tools for creating an image. I've got tools for compressing images, generating mipmaps, and even for poking at their basic data format. My issue is with texture assembly. DDS files support cubemaps, array textures, and even cubemap arrays. But I don't know of a tool that can pack a series of images into a cubemap or the like. What tools are available for doing this kind of thing?

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• T-SQL Tuesday - IO capacity planning

  - by Michael Zilberstein

  This post is my contribution to Adam Machanic's T-SQL Tuesday #004 , hosted this time by Mike Walsh . Being applicative DBA, I usually don't take part in discussions which storage to buy or how to configure it. My interaction with IO is usually via PerfMon. When somebody calls me asking why everything is suddenly so slow on database server, "disk queue length" or "average seconds per transfer" counters provide an overwhelming answer in 60-70% of such cases. Sometimes it can be...(read more)

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• MP4 files show up but won't stream to xbox 360

  - by Greg

  I set up a basic media server to stream to my 360 using uShare. Here are the instructions I used: http://linuxexpresso.wordpress.com/2011/01/02/howto-ubuntu-upnp-server-to-xbox-360/. I can stream avi files fine but I cannot stream mp4s. When I go to videos on the xbox, I can see all of the videos and folders but when I click play for an mp4 nothing happens. On my ubuntu desktop I can click on the mp4 file and it plays fine. And if I take that file, stick it on a thumb drive and plug it directly into the xbox the mp4 will play off the thumb drive. I'm lost for why it won't work through ushare. Any ideas?

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• How to explain OOP to a matlab programmer?

  - by Oak

  I have a lot of friends who come from electrical / physical / mechanical engineering background, and are curious about what is "OOP" all about. They all know Matlab quite well, so they do have basic programming background; but they have a very hard time grasping a complex type system which can benefit from the concepts OOP introduces. Can anyone propose a way I can try to explain it to them? I'm just not familiar with Matlab myself, so I'm having troubles finding parallels. I think using simple examples like shapes or animals is a bit too abstract for those engineers. So far I've tried using a Matrix interface vs array-based / sparse / whatever implementations, but that didn't work so well, probably because different matrix types are already well-supported in Matlab.

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• Loading files during run time

  - by NDraskovic

  I made a content pipeline extension (using this tutorial) in XNA 4.0 game. I altered some aspects, so it serves my need better, but the basic idea still applies. Now I want to go a step further and enable my game to be changed during run time. The file I am loading trough my content pipeline extension is very simple, it only contains decimal numbers, so I want to enable the user to change that file at will and reload it while the game is running (without recompiling as I had to do so far). This file is a very simplified version of level editor, meaning that it contains rows like: 1 1,5 1,78 -3,6 Here, the first number determines the object that will be drawn to the scene, and the other 3 numbers are coordinates where that object will be placed. So, how can I change the file that contains these numbers so that the game loads it and redraws the scene accordingly? Thanks

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• Examples of interesting implementations of character stats?

  - by Tchalvak

  I've got this BBG going ( http://ninjawars.net ), and the character stats currently are simplistic. I'm looking to add a few stats to the current 1/2 (strength and maximum hitpoints, essentially). I've come up with: (strength (unchanged), speed, stamina, and some others that are somewhat interesting wildcard stats). However, I'm not satisfied with how boring the effects of some of these stats are, because they're very linear. Better stat, better effects of the stat, but the stats don't interact with each-other, there's no Rock-Paper-Scissors interaction, having more is always better all the time. So what I'd really like is to see examples of interesting character stats or effects of stats? Examples that I can think of off hand: Call of Cthulu's Insanity stat (things get really weird/chaotic if you start losing sanity) White Wolf stats, to a certain extent (the stats themselves have some basic effects, and all skills effectiveness base themselves off of stats as well) What are some other ways people have used stats to check out?

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• Speed up Banshee's indexing of files on a device

  - by Stefano Palazzo

  I've got an external hard drive with music on it, around 250 albums. To make it work nicely with Banshee, I've created an .is_audio_player file on the device, containing audio_folders=Music. Every time I plug it in, Banshee takes around two minutes to index the thing, slowly building up the library - and being unusably sluggish while doing that. Is there, per chance, any way to speed it up? Should I not mount the hard disk as a music player, but add it's contents to my library? And, if I do, won't that give me lots of annoying X symbols next to the titles, as they can't be found sometimes? What's the best way to have my library on an external HDD?

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• /etc/init.d Character Encoding Issue

  - by Ryan Rosario

  I have a script in /etc/init.d on an EC2 image that, on machine startup, pulls in source code via SVN, builds it, and then runs it using Ant. The source code is Java. Within this code is a call to the Weka library which writes a file to disk. On most Ubuntu AMIs, and my home machines' versions of Ubuntu, there is no issue. The problem is that with certain versions/AMIs of Ubuntu, Unicode characters in the file are replaced with question marks ('?'). If I run the job manually on the trouble instance, Unicode is output to file correctly, but not when run from /etc/init.d. What might be causing this problem and how can I fix it so that Unicode characters appear correctly in files written from /etc/init.d processes?

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• Which version of Java should I use for learning?

  - by Dan

  I am a QA engineer interested in mobile development and automation.I have basic programming experience (intermediate level Python, C++ programmer) and as most companies choose Java for writing frameworks I need to pickup Java. I use Ubutnu 12.04 LTS and I will be using Head First Java as learning material. When I searched for JDK options I found Oracle Java 6 and 7 and Open JDK. I read somewhere in Ubuntu forums that Java 6 is not recommended on Ubuntu systems and I am a little bit confused about which version should I use, that would be compatible with the book and the OS.

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• Run fstrim from LiveCD

  - by CharlesW

  A few years ago I installed Ubuntu 10.04 with LVM + LUKS on a system with SSD, TRIM was not enabled. Now I want to install Ubuntu 12.04 on the same SSD. I have found a guide explaining how to enable TRIM on Ubuntu 12.04 with LVM + LUKS, but before installing the new system, I want to clean out all the "marked for deletion" data generated under Ubuntu 10.04, to make the disk fast as new. My plan is to boot a Ubuntu 12.04 LiveCD and create a new ext4 filesystem on the SSD, then mount the filesystem and run fstrim on it. After rebooting the LiveCD I will install the system as normal, and enable TRIM. Can anybody say if this will work?

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