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  • what would be a good way to implement/render a 2d tiled map for a browser game?

    - by jj_
    I've made this little rpg ruby game I did while learning and now I'd like to make it into a browser game. I've already set up Sinatra framework to serve it, so what I am looking for, before everything else, is a way to represent the game map in browser (location attributes are stored in db). A new map is randomly generated by code for each new game at each game start. For now forget db, and let's say a map (say 100x100 "squares") is stored as a tridimensional array. (x,y, ...) Last "dimension" of array stores who & what is at that map cell: a player, a building, whatever. So all I have to do is render those "squares" or array cells to a 2d tiled map in the browser. The map does not need to refresh or be dynamically fetched as you scroll it, (at least at this stage of development) but, a technology which would allow me to do so in future would be a good reason for choosing it. Things that I thought of: html tables, html5 canvas, some js framework which is designed exactly with this purpose (which I do not know of = please advice). Yes I know about gamequery-js framework, but I've never used it, and I don't know if it's going to slow down everything down to inusability as I'm adding new features (scrolling, ajax). I really don't know of any other alternatives.. maybe there are lighter approaches? Easier or more minimalistic ways ? More targeted js framework which is the right tool for the job? Maybe just some html canvas code, or even simple image maps, or images with absolute positioning will be enough? The thing is I'd like to start simple, and then gradually make it better, so, as I said before, I'd prefer something that will give me room for improvement or is headed toward new web tendencies but which will also give me a bit of gratification in the beginning :) So.. advices are needed! And appreciated! :) Thanks p.s. Flash is excluded because I don't like it.

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  • SQL: empty string vs NULL value

    - by Jacek Prucia
    I know this subject is a bit controversial and there are a lot of various articles/opinions floating around the internet. Unfortunatelly, most of them assume the person doesn't know what the difference between NULL and empty string is. So they tell stories about surprising results with joins/aggregates and generally do a bit more advanced SQL lessons. By doing this, they absolutely miss the whole point and are therefore useless for me. So hopefully this question and all answers will move subject a bit forward. Let's suppose I have a table with personal information (name, birth, etc) where one of the columns is an email address with varchar type. We assume that for some reason some people might not want to provide an email address. When inserting such data (without email) into the table, there are two available choices: set cell to NULL or set it to empty string (''). Let's assume that I'm aware of all the technical implications of choosing one solution over another and I can create correct SQL queries for either scenario. The problem is even when both values differ on the technical level, they are exactly the same on logical level. After looking at NULL and '' I came to a single conclusion: I don't know email address of the guy. Also no matter how hard i tried, I was not able to sent an e-mail using either NULL or empty string, so apparently most SMTP servers out there agree with my logic. So i tend to use NULL where i don't know the value and consider empty string a bad thing. After some intense discussions with colleagues i came with two questions: am I right in assuming that using empty string for an unknown value is causing a database to "lie" about the facts? To be more precise: using SQL's idea of what is value and what is not, I might come to conclusion: we have e-mail address, just by finding out it is not null. But then later on, when trying to send e-mail I'll come to contradictory conclusion: no, we don't have e-mail address, that @!#$ Database must have been lying! Is there any logical scenario in which an empty string '' could be such a good carrier of important information (besides value and no value), which would be troublesome/inefficient to store by any other way (like additional column). I've seen many posts claiming that sometimes it's good to use empty string along with real values and NULLs, but so far haven't seen a scenario that would be logical (in terms of SQL/DB design). P.S. Some people will be tempted to answer, that it is just a matter of personal taste. I don't agree. To me it is a design decision with important consequences. So i'd like to see answers where opion about this is backed by some logical and/or technical reasons.

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  • Problem with RecordMyDesktop program

    - by Saeid87
    I am trying to record some tutorials using RecordMyDesktop application. The problem is the video becomes jagged and unusable as you can see from the screenshot I have taken while playing a saved video. I don't know what can be the problem, but I guess it has something to do with my graphics driver. My laptop is using Intel HD 3000 series and I couldn't find any update for it. If you know what might be the problem and how to solve it I will really appreciate it!

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  • Metaobject protocol:Why is it known as an important concept

    - by sushant
    Metaobject protocol is protocol for metaobjects in a programming languages. Although I understand it on simple terms, I want to know the reason and a summary of real world usage patterns of this protocol. So, why exactly is metaobject and more importantly metaobject protocol is such a good idea. I want to know the problem which led to its evolution and also, its high power usage. Opinions as well as general overview/description/alternate explanations are also welcome.

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  • Install Ubuntu on USB + Disk Encryption

    - by snipey
    I want to create an Operating System installed upon a USB instead HDD (4 GB) So I wanted to know if there were any special steps for it or simply choosing usb in installation menu. P.S - I want to do full install and not live boot. And After that I want to encrypt the entire Operating System using TrueCypt , guide already present on their website , I just wanted to know if it would be compatible with this method. THanks :)

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  • I'm trying to understand hash tables - can someone explain it to me - clearly?

    - by Stevo
    I want to understand the correct use and implementation of hash tables in php (sorry). I read somewhere that an in-experienced programmer created a hash table and then iterated through it. Now, I understand why that is wrong but I haven't quite got the full knowledge to know if my understanding is correct (if you know what I mean). So could someone explain to me how to implement a hash table in php (presumably an associative array) and perhaps more importantly, how to access the values 'with a hash' and what that actually means?

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  • How do great enterprises estimate software development efforts?

    - by Ed Pichler
    I was learning about how to estimate software development effort, and would like to know how successful enterprises estimate their projects. How they do to know how much time a system will spend to be developed? What are the modern techniques to do this? What are the techniques used by these modern enterprises? Some articles and interviews of employees of those enterprises would be interesting. I asked on Project Management site of StackExchange too.

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  • 3.0.0-13-lowlatency-pae, where can I find its source

    - by user643019
    I know for another post that using apt-get source linux-image-$(uname -r) I can get the kernel source, but I'm usign the 3.0.0-13-lowlatency-pae kernel and using the command, I got this message: Picking 'linux-lowlatency' as source package instead of 'linux-image-3.0.0-13-lowlatency-pae' So, I will appreciate any help, hope that someone know where it can be located. Thanks everybody in advance.

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  • Hilarious

    - by James Luetkehoelter
    I don't know how many of you know about this site, but it raises my spirits on a daily basis. I found today's entry oddly familiar... http://thedailywtf.com/Articles/sp_getNothing.aspx Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!...(read more)

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  • Ubuntu 12.04 and KDE, graphical temperature monitor for GPU

    - by Frank
    I have ubuntu 12.04 and KDE. I already installed "lm-sensors", "hardware sensors indicator" and "Psensors" but none works well for me. I also know a couple of commands to find gpu temperature on terminal but I don't need that, I need a graphical application that works with kde to use. Do you know something that helps me? My card is MSI R6870 Hawk (from ATI original HD6870) and I have fglrx drivers Thanks

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  • How many types of programming languages are there?

    - by sova
    Basically, I want to learn lots of programming languages to become a great programmer. I know only a handful to depth and I was hoping someone could elaborate on how many classes or types of programming languages there are. Like how you would lump them together if you had to learn them in groups. Coming from a Java background, I'm familiar with static typing, but I know that in addition to dynamic typing there has to be such variety in available languages that I would love to see a categorical breakdown if possible.

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  • MMORPG game balancing

    - by Gary Paluk
    I've seen a couple of examples of some game balancing techniques in books yet they are not comprehensive and not particularly aimed at MMORPGs but I'm looking for practical examples of game balancing techniques for MMORPGs. I am interested to know if anyone has documented the techniques used in popular games with proven success in this area. Ideally, any resource would cover most common types of stats and include layman mathematical models or techniques used to balance game mechanics found in advanced MMORPGs (I know it's a cliché, but WoW style) Any help would be great!

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  • Why aren't more desktop apps written with Qt?

    - by Dehumanizer
    As far as I know and have understood in my experience with Qt, it's a very good and easy to learn library. It has a very well designed API and is cross-platform, and these are just two of the many features that make it attractive. I'm interested to know why more programmers don't use Qt. Is there a deficiency which speaks against it? Which feature makes other libraries better than Qt? Is the issue related to licensing?

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  • Where can I learn more about JavaScript and Python?

    - by Tom Maxwell
    Been teaching myself how to code over the past four months or so -- mainly in JavaScript, but just started Python -- and had a revelation today. I can write in JavaScript pretty well, but I don't actually know what JavaScript is. Basically I know how to use it, but not the advantages/disadvantages, its origination, its purpose, etc. Where can I learn more about the languages themselves and not just how to write in them?

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  • Top SEO Secret That Gets a Top 5 Rank Every Time

    Want to get to the top ranks of Google? It's funny because doing so is actually very simple if you know how, but the fact is that there's one SEO secret that only a handful of gurus know and use. This secret is extremely powerful and can get top 5 ranks every time it's used. Here's what it is and how to use it.

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  • How many players can UDK support without Networking

    - by N0xus
    I've been looking for the answer to this for some time now, but cannot find anything online that is helpful. What I want to know is the amount of players that the UDK can support on one single machine. An example of this would be golden eye on the N64. On that, you could get 4 players all playing the same game at the same time using split screen. Like in this image: Does anyone know is the UDK is capable of doing similar?

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  • How to make XFCE show the Shutdown Menu?

    - by topskip
    I have installed XFCE on an "Ubuntu Server" (in a Virtual Machine) so I have a small and fast environment. But when I want to log out, I usually (not always) see a gray shutdown and reboot button, but I like to be able to shutdown via that menu (I know of shutdown -h now, but the users of my machine don't necessarily know). I use the display manager 'slim'. Question: how can I enable these buttons permanently?

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  • How to "reverse-backport" a package available on earlier Ubuntu distribution to later Distribution?

    - by Adam Ryczkowski
    There are 4 packages I am using on 12.04 which are not available on 12.10: xkcd-browser ;-) cuttlefish bluphone xserver-xorg-input-synaptics (it allows for touchpad rotation that could go along screen rotation with randr) Is there any way of more-or-less automatic reverse-backporting? (I know, that one "solution" is to wait. But unless I know for how long I should do it, it doesn't solve anything.)

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  • Mouse / Usb don't work

    - by Enrico
    I just start now with Xubuntu (11.10) and don't know why but my mouse work strage, so if i move my mouse it move like jump not fluid (but if i use my pad there aren't any problem). another really strange thing is if I take off the mouse (usb) and put back doesn't work anymore.also if i put pen drive nothing uppen, maybe it's some usb problem or something i don't know. PC: Fujitsu Siemens Amilo. thank for your help Enrico

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  • Driving Growth through Smarter Selling

    - by Samantha.Y. Ma
    With the proliferation of social media and mobile technologies, the world of selling and buying has drastically changed, as buyers now have access to more information than they did in the past. In fact, studies have shown that buyers complete 60 percent of the buying process before they even engage with a salesperson. The old models of selling no longer work effectively; and the new way of selling is driven by customer insights. To succeed, sales need to be proactive, not reactive. They need to engage with the customer early, sometimes even before the customer’s needs are fully understood. In fact, the best sales reps prescribe a solution that the customer doesn't even know they need, often by leveraging social media to listen, engage and collaborate with peers. And they fully tap into the power of analytics and data to drive results.  Let’s look at some stats regarding challenges facing sales today. According to recent studies, sales reps spend 78 percent of their time doing administrative things -- such as planning, searching for information, data entry -- and only 22 percent of the time actually selling. Furthermore, 40 percent of B2B sales reps miss their quota, and only 3 percent of companies can say with confidence that their forecasts are “always accurate.” How do you drive growth in this modern day and age? It's not just getting your sales teams to work harder; it's helping them work smarter and providing them with a solution they want to use, on the device(s) they already know, giving them critical insights and tools to be more productive, increase win rates, and close deals faster. Oracle Sales Cloud was designed to do exactly that. It enables smarter selling that allows reps to sell more, managers to know more, and companies to grow more.  Let’s face it—if all CRM solutions worked well, sales executives wouldn’t be having the same headaches as they had in the past. Join Oracle’s Thomas Kurian and Doug Clemmans on Tuesday, October 22 as they explain: • How today’s sales processes have rendered many CRM systems obsolete • The secrets to smarter selling, leveraging mobile, social, and big data • How Oracle Sales Cloud enables smarter selling—as proven by Oracle and its customers Take the first step down the path toward smarter selling. With Oracle Sales Cloud, reps sell more, managers know more, and companies grow more.

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  • Medical Devices which supports Direct access through Bluetooth Low Energy [on hold]

    - by Suganthan
    I have went through this link and came to know that we can directly interact with BLE devices to read and write data, so I just want to know some medical device which supports direct access to third-party application (we can directly access the data from the medical device data). Is their any devices which supports direct access to the data Note: I already went through medical devices like Withings and Fitbit

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  • Ubuntu Lock Screen Conflict with Google Chrome

    - by S.K.
    I don't know if this is a "feature" or not, but when I lock my screen in Ubuntu (GNOME 3), if Google Chrome needs to show a JavaScript alert (like if I set a reminder for an event in Google Calendar), Chrome will show up on top of the lock screen. If you'd like to simulate it, try running this JSFiddle, just click on the green box and lock your screen before the alert shows up - http://jsfiddle.net/skoshy/ZYSYr/ Anyone know how to fix/avoid this?

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  • build my own CDN service

    - by user5332
    I have two servers, both with self domain 1st www.myexample1.com 2nd www.myexample2.com and now I would like to setup CDN of www.myexample1.com to www.myexample2.com but I dont know how setup DNS or Apache that, so both servers served files for www.myexample1.com request ... I don't need solve databases, sessions or someting else... but I need know, how to do that both server will available as www.myexample1.com

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  • SQL SERVER What is AdventureWorks?

    NOTE: If you know the answer of this question, then I request you to stop reading this post right now. Please do not leave comment about this blog post not being useful to you, if you knew the answer. Few days ago, I received DM asking What is an AdventureWorks database and why in all [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • What folder is this code signifying?

    - by clifgray
    I am trying to install OpenNi on ubuntu and have found some decent looking instructions but I am not sure what I need to do for this one specific case. Here are the instructions and here is the line that is tripping me up: cd OpenNI/Platform/Linux/CreateRedist/ chmod +x RedistMaker ./RedistMaker cd ../Redist/OpenNI-Bin-Dev-Linux-x64-v1.5.2.23/ sudo ./install.sh I don't know what folder the cd ../Redist/OpenNI-Bin-Dev-Linux-x64-v1.5.2.23/ line is talking about and can't find it anywhere. Does anyone know what this is?

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