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  • How do I keep user input and rendering independent of the implementation environment?

    - by alex
    I'm writing a Tetris clone in JavaScript. I have a fair amount of experience in programming in general, but am rather new to game development. I want to separate the core game code from the code that would tie it to one environment, such as the browser. My quick thoughts led me to having the rendering and input functions external to my main game object. I could pass the current game state to the rendering method, which could render using canvas, elements, text, etc. I could also map input to certain game input events, such as move piece left, rotate piece clockwise, etc. I am having trouble designing how this should be implemented in my object. Should I pass references to functions that the main object will use to render and process user input? For example... var TetrisClone = function(renderer, inputUpdate) { this.renderer = renderer || function() {}; this.inputUpdate = input || function() {}; this.state = {}; }; TetrisClone.prototype = { update: function() { // Get user input via function passed to constructor. var inputEvents = this.inputUpdate(); // Update game state. // Render the current game state via function passed to constructor. this.renderer(this.state); } }; var renderer = function(state) { // Render blocks to browser page. } var inputEvents = {}; var charCodesToEvents = { 37: "move-piece-left" /* ... */ }; document.addEventListener("keypress", function(event) { inputEvents[event.which] = true; }); var inputUpdate = function() { var translatedEvents = [], event, translatedEvent; for (event in inputEvents) { if (inputEvents.hasOwnProperty(event)) { translatedEvent = charCodesToEvents[event]; translatedEvents.push(translatedEvent); } } inputEvents = {}; return translatedEvents; } var game = new TetrisClone(renderer, inputUpdate); Is this a good game design? How would you modify this to suit best practice in regard to making a game as platform/input independent as possible?

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  • How can I keep straight alpha during rendering particles?

    - by April
    Rencently,I was trying to save textures of 3D particles so that I can reuse the in 2D rendering.Now I had some problem with alpha channel.Some artist told me I that my textures should have unpremultiplied alpha channel.When I try to get the rgb value back,I got strange result.Some area went lighter and even totally white.I mainly focus on additive and blend mode,that is: ADDITIVE: srcAlpha VS 1 BLEND: srcAlpha VS 1-srcAlpha I tried a technique called premultiplied alpha.This technique just got you the right rgb value,its all you need on screen.As for alpha value,it worked well with BLEND mode,but not ADDITIVE mode.As you can see in parameters,BLEND mode always controlled its value within 1.While ADDITIVE mode cannot guarantee. I want proper alpha,but it just got too big or too small consider to rgb.Now what can I do?Any help will be great thankful. PS:If you don't understand what I am trying to do,there is a commercial software called "Particle Illusion".You can create various particles and then save the scene to texture,where you can choose to remove background of particles. Now,I changed the title.For some software like maya or AE,what I want is called [straight alpha].

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  • When a co-worker asks you to teach him what you know, do you share the information or keep it to yourself? [closed]

    - by Chuck
    I am the only developer/DBA in a small IT department. There is another guy who can do it, but he's more of a backup as he spends his time working on IT support stuff. Anyway we have a new hire and I've been training him on the IT support side of things. Seems like he is eager to learn and be productive, but nobody is going out of their way to show him anything. He's been asking me to teach him database design, SQL, etc. For some reason, the boss has him working with me. He is also sending him to meetings that I go to, yet he hasn't said outright that I have to teach him anything. Meanwhile, the boss insists on doing a lot of the support work himself (i.e. he hoards information and doesn't delegate to anyone). I'm a little bit on the fence. First, the new guy doesn't yet have a strong foundation on the IT support functions which is where we really need help at this time. Second, I paid thousands of dollars for classes and spent many hours learning this stuff. Is it my responsibility to teach others skills that I had to learn on my own? Others here really aren't quick to share information so I'm not sure that I should either in this environment. I do know that if I get him involved, and get him started on projects, then I'd be responsible for his mistakes. I had to take the heat for the other guy when he made mistakes. OTOH the guy wants to learn something, is motivated, and I don't want to stop him. We've had our share of slackers in the group and it's nice to have someone who is willing to work for a change. So what would you guys do? Would you teach him the skills that you spent all of that time learning? Set him up with a test database on his PC and recommend some books for him? Encourage him to get a strong foundation in IT support first and ask later? We haven't had a new hire in years, let alone one that is interested in what I do, so this is new to me.

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  • Should I keep separate client codebases and databases for a software-as-a-service application?

    - by John
    My question is about the architecture of my application. I have a Rails application where companies can administrate all things related to their clients. Companies would buy a subscription and their users can access the application online. Hopefully I will get multiple companies subscribing to my application/service. What should I do with my code and database? Seperate app code base and database per company One app code base but seperate database per company One app code base and one database The decision involves security (e.g. a user from company X should not see any data from company Y) performance (let's suppose it becomes successful, it should have a good performance) and scalability (again, if successful, it should have a good performance but also easy for me to handle all the companies, code changes, etc). For the sake of maintainability, I tend to opt for the one code base, but for the database I really don't know. What do you think is the best option?

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  • eCryptfs : How to keep the home mounted without being over ssh?

    - by Bebeoix
    I have a daemon program who need to read in a file who is saved somewhere in my home folder. But every time I close my ssh connection, this daemon can't read the file because it appear that eCryptfs unmount the home. Maybe there is an option to force eCryptfs to not only mount with an ssh connection ? I didn't found it. Thanks. PS : I know this thread, Why is ecryptfs only mounting private home directory over ssh?, but this is not the proper/good way to deal with the request.

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  • How can I keep the correct alpha during rendering particles?

    - by April
    Rencently,I was trying to save textures of 3D particles so that I can reuse the in 2D rendering.Now I had some problem with alpha channel.Some artist told me I that my textures should have unpremultiplied alpha channel.When I try to get the rgb value back,I got strange result.Some area went lighter and even totally white.I mainly focus on additive and blend mode,that is: ADDITIVE: srcAlpha VS 1 BLEND: srcAlpha VS 1-srcAlpha I tried a technique called premultiplied alpha.This technique just got you the right rgb value,its all you need on screen.As for alpha value,it worked well with BLEND mode,but not ADDITIVE mode.As you can see in parameters,BLEND mode always controlled its value within 1.While ADDITIVE mode cannot guarantee. I want proper alpha,but it just got too big or too small consider to rgb.Now what can I do?Any help will be great thankful. PS:If you don't understand what I am trying to do,there is a commercial software called "Particle Illusion".You can create various particles and then save the scene to texture,where you can choose to remove background of particles.

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  • Should I keep investing into data structures and algorithms?

    - by Chiron
    These days, I'm investing heavily in data structures and algorithms and trying to solve some programming puzzles. I'm trying to code and solve with Java and Clojure. Am I wasting my time? should I invest more in technologies and frameworks that I already know in order to gain deeper knowledge (the ins and the outs) and be able to code with them more quickly? By studying data structures and algorithms, am I going to become a better programmer or those subjects are only important during college years?

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  • Upgrading Blog to WordPress, keep old one or redirect?

    - by Spazm
    I have had a blog for around 4 years now that has gained some success and gets tons of residual and organic traffic. I am using an outdated version of BlogEngine.NET and we are going to switch to WordPress. Currently, our blog is at ourwebsite.com/blog, and I don't really want to mess with our web server. I setup a new server just for WordPress and instead of dealing with proxies and things that are above my head, the new blog will be at blog.oursite.com. I am trying to figure out the best way to go about doing this. We value our search engine rankings very much so, as that is where 90% of our traffic comes from. Would I be best off: Importing all of the old blog posts from oursite.com/blog to blog.oursite.com and then redirecting all of the articles, categories, authors, pages and tags to the new blog and giving up the direct links to our current site. Keeping all of our current articles as they are, and only add new content to the new blog.oursite.com and just kind of let the old blog float around our site.

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  • Could you give me an example of how to attach an object in Deleted state – I keep getting an exception [migrated]

    - by carewithl
    From MSDN : An object in the Deleted state can only be attached when the ObjectStateManager is already tracking the relationship instance. Could you give me an example of how to attach an object in the Deleted state. I tried the following and got "System.InvalidOperationException: The object being attached is in an added or deleted state. Relationships cannot be created for objects in this state". var contact = context.Contacts.First(); Console.WriteLine(contact.Addresses.Count()); // 2 var address = contact.Addresses.First(); context.Addresses.DeleteObject(address); contact.Addresses.Attach(address); // InvalidOperationException thank you

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  • How to keep a window from overlapping into another workspace?

    - by user1477
    It's annoying to me how if a window is even a couple pixels off the right edge of my screen, when I switch to that right workspace, the system thinks that the window is there. The unity launcher bar gets hidden because of it and switching to that window keeps you on the current workspace where you can't even see the window cause it's only a couple pixels. KDE seems to do this much better where when you switch to another workspace, the window just isn't there. But well I don't want KDE. Any way of getting that same behavior without the switch?

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  • What To Keep In Mind When You Design A Logo?

    Do you want your business to reach the highest peak of success no matter how big your competitors are? If yes, then you can?t afford to be slow or lazy. Realistically speaking, running your business ... [Author: Sha Amen - Web Design and Development - May 19, 2010]

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  • Add closure after concatenating files or keep one for each separate file?

    - by sdespolit
    At the moment every javasrcipt file in our project includes closure wrapper. Before deploying all files are concatenated and minimized. And i'm asking myself, do we really need all that closures OR one closure added after concatenation will do the job. I can see only one reason not to do that - the variable we are sharing between files will get in the global namespace. But there is no conflict so is don't see any problem. The real question is what other cons may be? Or more generally what approach is better - one closure or many?

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  • Gnome-shell freezes. What to do to keep apps open, like "alt+f2 r" when GS works

    - by user94592
    This is a repost, because no one had popper solution. What to do when gnome-shell freezes? Everything works correctly (music is still playing etc.), just the gui freezes. I am able to ctrl+alt+f1. What can I do after logging in the ctrl+alt+f1 terminal, in order to restore gnome-shell? If gnome-shell worked, I'd just hit alt+f2 and run r. I usually end up sudo rebooting which I don't like, because I have to reopen apps.

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  • How to set JtextArea to keep fixed no of rows?

    - by Hippo
    How can i keep no of rows constant in text area. I need to create a console window for my application. If rows exceeds predefined no of rows first rows must get disposed. As if first written row will be destroyed first when i append anything which exceeds no of rows set. One more thing , i need to keep vertical scroll bar. That means no of rows must not be the whatever rows are visible when text area it opened. For example : - no of visible rows on view port are 30. It should keep 120 rows information, which will can be seen with the help of scroll bar.

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  • NSArray : release its objects, but keep a pointer to it.

    - by Leo
    Hello, I declare an NSArray in my code then building the array from another array. I process my NSArray and when I'm finished, I would like to release the objects, but I'm reusing this pointer to NSAarray again later to do the same process (creating the array from another array, process then releasing).. So I need to keep the pointer. What should I do ? Here is roughly what I want to do, the buildArray is creating and returning an autoreleased NSArray : NSArray *myArray; for (int i = 0, i < 10, i++){ [myArray arrayWithArray:[self buildArray]]; // Here I process myArray [myArray = nil] // is my guess } I need to keep a pointer to my NSArray, in order to reuse later in the loop, but what is happening to the objects created with [self buildArray]? What is the best to do in order not to keep unused object and arrays ? Or maybe the best solution is simply to removeAllObject of the array..? Thank you!

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  • How to keep your self up to date? [closed]

    - by nimo
    Possible Duplicate: Staying Relevant As a Programmer As you all know in our line of work it is important to keep your self up to date with all of the technical progress that is being made out there. As a developer you have to be quick to grasp new programming languages and programming concepts as well as completely new technologies. I read about a guy who got fired at 50 years of age with tons of experience in some ancient technology and he now couldn't get a job anywhere because his experience wasn't in OOP or some other more modern concept. I don't what to end up in that situation. How do you keep your self up to date? How do you train your self and make sure that you keep your self at the forefront?

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  • Why does using ASP.NET OutputCache keep returning a 200 OK, not a 304 Not Modified?

    - by Pure.Krome
    Hi folks, i have a simple aspx page. Here's the top of it:- <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Foo.aspx.cs" Inherits="Foo" %> <%@ OutputCache Duration="3600" VaryByParam="none" Location="Any" %> Now, every time I hit the page in FireFox (either hit F5 or hit enter in the url bar) I keep getting a 200 OK response. Here's a sample reply from FireBug :- Request Headers:- GET /sitemap.xml HTTP/1.1 Host: localhost.foo.com.au User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-GB; rv:1.9.2) Gecko/20100115 Firefox/3.6 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-au,en-gb;q=0.7,en;q=0.3 Accept-Encoding: gzip,deflate Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7 Keep-Alive: 115 Connection: keep-alive Cookie: <snipped> If-Modified-Since: Tue, 01 Jun 2010 07:35:17 GMT If-None-Match: "" Cache-Control: max-age=0 Response Headers:- HTTP/1.1 200 OK Cache-Control: public Content-Type: text/xml; charset=utf-8 Expires: Tue, 01 Jun 2010 08:35:17 GMT Last-Modified: Tue, 01 Jun 2010 07:35:17 GMT Etag: "" Server: Microsoft-IIS/7.5 X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 Date: Tue, 01 Jun 2010 07:35:20 GMT Content-Length: 775 Firebug Cache tab:- Last Modified Tue Jun 01 2010 17:35:20 GMT+1000 (AUS Eastern Standard Time) Last Fetched Tue Jun 01 2010 17:35:20 GMT+1000 (AUS Eastern Standard Time) Expires Tue Jun 01 2010 18:35:17 GMT+1000 (AUS Eastern Standard Time) Data Size 775 Fetch Count 105 Device disk Now, if i try it in Fiddler using the Request Builder (and no extra data) I also keep getting the same 200 OK reply. Request Headers:- GET http://localhost.foo.com.au/sitemap.xml HTTP/1.1 User-Agent: Fiddler Host: foo.com.au Response Headers:- HTTP/1.1 200 OK Cache-Control: public Content-Type: text/xml; charset=utf-8 Expires: Tue, 01 Jun 2010 07:58:00 GMT Last-Modified: Tue, 01 Jun 2010 06:58:00 GMT ETag: "" Server: Microsoft-IIS/7.5 X-Powered-By: UrlRewriter.NET 2.0.0 X-AspNet-Version: 4.0.30319 Date: Tue, 01 Jun 2010 06:59:16 GMT Content-Length: 775 It looks like it's asking to cache it but it's not :( Server is a localhost IIS7.5 on Win7. (as listed in the Response data). Can anyone see what I'm doing wrong?

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  • What does "stupid" in "Keep It Simple, Stupid" mean?

    - by Borek
    I'm not a native speaker and always thought that the last "S" in KISS is a "salutation", like calling me that way if I don't keep things simple. But Wikipedia states that KISS stands for "Keep It Simple and Stupid". Which is "correct" or at least makes sense to you? And yes, this is a stupid question :)

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  • How do you keep the order using SELECT WHERE IN()?

    - by Pepper
    Is there a way to keep the order when using SELECT WHERE IN()? For example, using the following query: SELECT id FROM data_table WHERE id IN(56,55,54,1,7); The results will come back using the default order by id. 1,7,54,55,56 When I want to keep the order used in the IN: 56,55,54,1,7 Is there a quick way to do this in mySQL or will I be forced to order it after in code. Thanks :)

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  • Free web app that can be used to keep track of loans made to people (like Mint)

    - by ShaChris23
    Is there a web app that is: Free Behaves like Mint But allows me to keep track of money I loan or owe other people? I should be able to setup an "account" for each person that I loan out to, and be able to "check off" when the person returns me the money, etc. I should also be able to add notes to each transaction to help me remember what it was for. Would be even nicer if I can add transactions via text messaging, email, etc.

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