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• What issues carry the highest risk in a software project?

  - by Mehrdad Afshari

  Clearly, software projects are different from other industries in terms of many things like for instance, quality assurance, project progress measurement, and many other things. Unique characteristics of software projects also makes the risk management process unique. Lots of issues in a project might lead it to unacceptable delay or failure to deliver business value. They might even make a complete disaster in the project. What are the deadliest risk factors in a software project? How to analyze, prevent and handle them? Particularly, I'm interested in the issues that you can detect from the beginning and you should keep an eye on (for example, you might be told about a third-party API that the current application uses and lacks documentation). Please share your experiences if they are relevant.

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• 2D platformer gravity physics with slow-motion

  - by DD

  Hi all, I fine tuned my 2d platformer physics and when I added slow-motion I realized that it is messed up. The problem I have is that for some reason the physics still depends on framerate. So when I scale down time elapsed, every force is scaled down as well. So the jump force is scaled down, meaning in slow-motion, character jumps vertically smaller height and gravity force is scaled down as well so the character goes further in the air without falling. I'm sending update function in hopes that someone can help me out here (I separated vertical (jump, gravity) and walking (arbitrary walking direction on a platform - platforms can be of any angle) vectors): characterUpdate:(float)dt { //Compute walking velocity walkingAcceleration = direction of platform * walking acceleration constant * dt; initialWalkingVelocity = walkingVelocity; if( isWalking ) { if( !isJumping ) walkingVelocity = walkingVelocity + walkingAcceleration; else walkingVelocity = walkingVelocity + Vector( walking acceleration constant * dt, 0 ); } // Compute jump/fall velocity if( !isOnPlatform ) { initialVerticalVelocity = verticalVelocity; verticalVelocity = verticalVelocity + verticalAcceleration * dt; } // Add walking velocity position = position + ( walkingVelocity + initialWalkingVelocity ) * 0.5 * dt; //Add jump/fall velocity if not on a platform if( !isOnPlatform ) position = position + ( verticalVelocity + initialVerticalVelocity ) * 0.5 * dt; verticalAcceleration.y = Gravity * dt; }

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• How to properly implement the Strategy pattern in a web MVC framework?

  - by jboxer

  In my Django app, I have a model (lets call it Foo) with a field called "type". I'd like to use Foo.type to indicate what type the specific instance of Foo is (possible choices are "Number", "Date", "Single Line of Text", "Multiple Lines of Text", and a few others). There are two things I'd like the "type" field to end up affecting; the way a value is converted from its normal type to text (for example, in "Date", it may be str(the_date.isoformat())), and the way a value is converted from text to the specified type (in "Date", it may be datetime.date.fromtimestamp(the_text)). To me, this seems like the Strategy pattern (I may be completely wrong, and feel free to correct me if I am). My question is, what's the proper way to code this in a web MVC framework? In a client-side app, I'd create a Type class with abstract methods "serialize()" and "unserialize()", override those methods in subclasses of Type (such as NumberType and DateType), and dynamically set the "type" field of a newly-instantiated Foo to the appropriate Type subclass at runtime. In a web framework, it's not quite as straightforward for me. Right now, the way that makes the most sense is to define Foo.type as a Small Integer field and define a limited set of choices (0 = "Number", 1 = "Date", 2 = "Single Line of Text", etc.) in the code. Then, when a Foo object is instantiated, use a Factory method to look at the value of the instance's "type" field and plug in the correct Type subclass (as described in the paragraph above). Foo would also have serialize() and unserialize() methods, which would delegate directly to the plugged-in Type subclass. How does this design sound? I've never run into this issue before, so I'd really like to know if other people have, and how they've solved it.

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• Debugging a Browser Redirect Loop

  - by just_wes

  Hi all, I am using CakePHP with the Auth and ACL components. My page loads fine for non-registered users, but if I try to log in as a registered user I get an infinite redirect loop in the browser. I am sure that this is some sort of permissions problem, but the problem exists even for users who have permissions for everything. The only way to prevent this behavior is to allow '*' in my AppController's beforeFilter method. What is the best way to debug this sort of problem? Thanks!

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• Applet JAR loading fails, since the http request doesn't include a basic auth header

  - by bowgene

  It's a farily simple setup. A .jar is hosted on a site which is protected by basic auth. I try to load the jar with an object tag - which works perfectly when tested without authentication. When the .jar is requested from the server, the basic auth header isn't included in the request. Why is this?

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• Store 3d models in game, the best way

  - by subSeven

  What is the best method to store 3d models in game ? I store in vectors: vector triangles (each triangle contain number of texcords, numer of vertex and number of normal), vector points; vector normals; vector texCords;

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• Ordering by Sum from a separate controller part 2

  - by bgadoci

  Ok, so I had this working just fine before making a few controller additions and the relocation of some code. I feel like I am missing something really simple here but have spent hours trying to figure out what is going on. Here is the situation. class Question < ActiveRecord::Base has_many :sites end and class Sites < ActiveRecord::Base belongs_to :questions end I am trying to display my Sites in order of the sum of the 'like' column in the Sites Table. From my previous StackOverflow question I had this working when the partial was being called in the /views/sites/index.html.erb file. I then moved the partial to being called in the /views/questions/show.html.erb file and it successfully displays the Sites but fails to order them as it did when being called from the Sites view. I am calling the partial from the /views/questions/show.html.erb file as follows: <%= render :partial => @question.sites %> and here is the SitesController#index code class SitesController < ApplicationController def index @sites = @question.sites.all(:select => "sites.*, SUM(likes.like) as like_total", :joins => "LEFT JOIN likes AS likes ON likes.site_id = sites.id", :group => "sites.id", :order => "like_total DESC") respond_to do |format| format.html # index.html.erb format.xml { render :xml => @sites } end end

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• Capture form fields and repopulate the form with them

  - by Joel Cunningham

  I am currently testing a large web form and would like to be able to easily populate the form with several different lots of test data without having to type them each time. Is there a generic way to capture form inputs on a web page and have them repopulated on a different page load? I thought a tool like greasemonkey might be able to do something like this.

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• Net Neutrality FAIL [closed]

  - by leeand00

  I know I'll get into all kinds of trouble for bringing this up on SO, but considering that nearly all of us programmers depend on the Internet to get our jobs done, I really think it's worth looking into today's failure of our right to use the Internet by way of Lobbying ISPs. Although something tells me there will be retribution for the actions of the ISPs/tel cos/cable and their lobbyist since, lets face it...ISPs/Telcos didn't invent the Internet. I'm not going to be the one to do it, but um I think somebody already has...as everybody I talked to was having Internet connection problems today at work. Just thought this might be relevant to all of our jobs...in the U.S.A. at least. If you work at an Big evil ISPs, by all means...try and close this question. If you don't...and your just a chap who enjoys your Internet access...please RT this: Contact The Democrats Who Are Against Net Neutrality (Full List W/ Contact Info) http://bit.ly/aMSV0W #NetNeutralityFAIL net-neutrality

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• Code Colorer Being Used

  - by Sarfraz

  Hello, I visited this site and i really liked the code colorer used by it (apart from that CSS3 article on speech bubbles). I went through the source code of that page but could not find which syntax highlighter is being used there. Does any one have an idea?

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• Events on controls in web server control

  - by MarkyMarc

  Hi All, I'm creating a web server control that has an image button on it. The html for the control is done in the RenderControls of the code, the control devrives from WebControl, IScriptControl, INamingContainer. The button is coded as follow in the RenderControls: System.Web.UI.WebControls.ImageButton img = new System.Web.UI.WebControls.ImageButton(); img.ImageUrl = "Url of the image"; img.Click += new ImageClickEventHandler(img_Click); img.ID = this.ClientID + "_img"; img.CausesValidation = false; imgLock.RenderControl(output); The button apreas in the browser but when i click on it, the page postsback but the event handler for the button doesn't get fired, from what i can figure out, since the control goes throught RenderControls eachtime the page is posted back, the button gets redrawn and the event handling disapears. This server control is in a master page. Anyone can help me on this? Thanks

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• web applications tend to have a admin panel?

  - by ajsie

  i wonder if large web applications like twitter and facebook have admin panels to handle CRUD for users, posts, images, themes and so on just like in CMS like drupal? so programmers have to code the front for the regular users AND back for the administrators? if i develop an web application is it recommended that i also code the admin part? or is it unnecessary since i can handle all directly in mysql and by editing php scripts directly? share your thoughts! thanks

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• Defeating a Poker Bot.

  - by The Rook

  There is a new Open Source poker bot called PokerPirate. I am interested in any creative ways in which a web application could detect/thwart/defeat a poker bot. (This is a purely academic discussion, in the same spirit that PokerPirate was written.)

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• Creating a Java platform game as easily as possible

  - by directx

  I need to create a Java-based platformer game for a high school project (not computer science related), and I want to spend as little time on technical stuff as possible. I'm already experienced in Java, and I already have most of the gameplay, graphics, etc. All I need to do is code it. I've looked and I'm considering one of two options that do not involving coding a game from scratch: Copy an existing Java platformer (best option, but I can't find an open source Java platformer) Use a Java game engine to avoid coding from scratch. I've looked at JGame but I'm not sure if it's the best bet for a platformer.

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• Will a Ph. D. in Computer Science help?

  - by Francisco Garcia

  I am close to my 30s and still learning about programming and software engineering. Like most people who like their profession I truly believe that I should aim to improve and keep updated. One of the things I do is reading technical papers from professional publications (IEEE and ACM) but I admit there are very good bloggers out there too. Lately I started to think (should I say realize?) that Ph. D people actually are expected to expand constantly their knowledge, but little is expected from lower classes once they know enough This made me think that maybe having a Ph. D will help to have more... respect? but I also believe that I am already getting old for that. Futhermore I see many master and doctor programs that does not seem to add any value over hard experience and self learning. I belive that a degree in computer science, althought not necessary, can lay out a good base for programming work. However: What can a Ph. D. degree give you that you cannot learn on your own? (if you are not into something VERY specific and want to work in a non academic environment)

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• Creating custom html text boxes

  - by Caylem

  Hi guys Just wondering how you would go about creating the effect as seen in the following image: Image The part i'd like to attempt to recreate is the gradient within the text field itself along with the line border surrounding the text box. Thanks.

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• Have you gotten a job through http://stackoverflow.com/ [closed]

  - by fastcodejava

  Or made any other financial gain?

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• Is there a table of OpenGL extensions, versions, and hardware support somewhere?

  - by Thomas

  I'm looking for some resource that can help me decide what OpenGL version my game needs at minimum, and what features to support through extensions. Ideally, a table of the following format: 1.0 1.1 1.2 1.2.1 1.3 ... multitexture - ARB ARB core core texture_float - EXT EXT ARB ARB ... (Not sure about the values I put in, but you get the idea.) The extension specs themselves, at opengl.org, list the minimum OpenGL version they need, so that part is easy. However, many extensions have been accepted and became core standard in subsequent OpenGL versions, but it is very hard to find when that happened. The only way I could find is to compare the full OpenGL standards document for each version. On a related note, I would also very much like to know which extensions/features are supported by which hardware, to help me decide what features I can safely use in my game, and which ones I need to make optional. For example, a big honkin' table like this: MAX_TEXTURE_IMAGE_UNITS MAX_VERTEX_TEXTURE_IMAGE_UNITS ... GeForce 6xxx 8 4 GeForce 7xxx 16 8 ATi x300 8 4 ... (Again, I'm making the values up.) The table could list hardware limitations from glGet but also support for particular extensions, and limitations of such extension support (e.g. what floating-point texture formats are supported in hardware). Any pointers to these or similar resources would be hugely appreciated!

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• How Does WordPress Block Search Engines?

  - by Sarfraz

  Hello, If you go to wordpress admin and then settings-privacy, there are two options asking you whether you want to allow your blog to be searched though by seach engines and this option: I would like to block search engines, but allow normal visitors How does wordpress actually block search bots/crawlers from searching through this site when the site is live?

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• What is an efficient way to find a non-colliding rectangle nearest to a location

  - by hyn

  For a 2D game I am working on, I am using y axis sorting in a simple rectangle-based collision detection. This is working fine, and now I want to find the nearest empty rectangle at a given location with a given size, efficiently. How can I do this? Is there an algorithm? I could think of a simple brute force grid test (with each grid the size of the empty space we're looking for) but obviously this is slow and not even a complete test.

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• Proper way to use multiple stylesheets...so it WORKS?

  - by thatryan

  I am making a site where I need to have styles separated for layout, colors and typography. So basically I took my main style sheet and just copied it 3 times, and in removed everything but coloring from one, everything but type related in another and etc. But when I link to them now there must be some cascade issue or something, because a lot of the type stuff is not being applied. Is there a proper way to do this?

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• How can I embed the result of a rails view in another website?

  - by NotDan

  I would like to allow users to call my ruby on rails app as a service which returns a 'div' with html content in it, and embed that div into their app (which will not be a rails application). For example, assume someone has their own php website that has a header/footer template that gets rendered, and a content area of the page that they need to fill based on some html I generate in my rails app. I would like to allow them, from php, to call to my website, get the 'div' I generate, and embed that as html in their php page. What I'm trying to do is host a service on my site that returns some html content, but actually show that content as part of another site, so that the end user only sees the other site and never really knows about mine. Is this possible?

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• .pl or .cgi for perl web script file

  - by Nano HE

  HI. I created two files 'hello.pl' and 'hello.cgi' with the code below. #!/usr/bin/perl print "Content-type:text/html\n\n"; print "hello world"; I can view the page via both http://www.mydomain.com/cgi-bin/hello.pl and http://www.mydomain.com/cgi-bin/hello.cgi. Which one is more sense in Perl web dev? BTW, the directory of 'cgi-bin' created by my VPS server, Do I need contact with my VPS support to remove it or just remain it like this URL style? Maybe http://www.mydomain.com/perDev/hello.cgi is better?

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• CSS Sales Templates

  - by Jasl

  I doing an hands-on for creating a sales page for selling an eBook. Can anyone share good samples or readymade pages please.

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• Weird stuttering issues not related to GC.

  - by Smills

  I am getting some odd stuttering issues with my game even though my FPS never seems to drop below 30. About every 5 seconds my game stutters. I was originally getting stuttering every 1-2 seconds due to my garbage collection issues, but I have sorted those and will often go 15-20 seconds without a garbage collection. Despite this, my game still stutters periodically even when there is no GC listed in logcat anywhere near the stutter. Even when I take out most of my code and simply make my "physics" code the below code I get this weird slowdown issue. I feel that I am missing something or overlooking something. Shouldn't that "elapsed" code that I put in stop any variance in the speed of the main character related to changes in FPS? Any input/theories would be awesome. Physics: private void updatePhysics() { //get current time long now = System.currentTimeMillis(); //added this to see if I could speed it up, it made no difference Thread myThread = Thread.currentThread(); myThread.setPriority(Thread.MAX_PRIORITY); //work out elapsed time since last frame in seconds double elapsed = (now - mLastTime2) / 1000.0; mLastTime2 = now; //measures FPS and displays in logcat once every 30 frames fps+=1/elapsed; fpscount+=1; if (fpscount==30) { fps=fps/fpscount; Log.i("myActivity","FPS: "+fps+" Touch: "+touch); fpscount=0; } //this should make the main character (theoretically) move upwards at a steady pace mY-=100*elapsed; //increase amount I translate the draw to = main characters Y //location if the main character goes upwards if (mY<=viewY) { viewY=mY; } }

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