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• Some help understanding and modifying a 2D shader

  - by electroflame

  I have a similar question as the one posed here, except that I don't wish to use a 1D Color Palette. I simply wish to have it display 1 color of my choosing (red, for example). I plan to use this as a "shield" effect for a 2D ship. I also wish to understand how it works a little bit better, as I'll be the first to admit that shaders in general are not my strongest suit. I'm not asking for an overview of HLSL (as that is too broad of a subject), just an explanation of how this shader works, and the best way to implement it in a 2D game. Code examples would be ideal (even if they are theoretical) but if the answer is explained well enough, I might be able to manage with plain old text. This is also in XNA 4.0. Thanks in advance.

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• Translate along local axis

  - by Aaron

  I have an object with a position matrix and a rotation matrix (derived from a quaternion, but I digress). I'm able to translate this object along world-relative vectors, but I'm trying to figure out how to translate it along local-relative vectors. So if the object is tilted 45 degrees around its Z-axis the vector (1, 0, 0) would make it move to the upper right. For world-space translations I simply turn the movement vector into a matrix and multiply it by the position matrix: position_mat = translation_mat * position_mat. For local-space translations I'd think I'd have to use the rotation matrix into that formula, but I see the object spin around instead when I apply a translation over time no matter where I multiply the rotation matrix.

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• How to add a daemon to a quickly project

  - by darkrex1986

  Currently I'm developing an application with quickly which is divided in two parts: A graphical UI where the user could configure some things, and a daemon which do the most work in the background. I started with the UI, to create some windows for settings and so on. Now I want to start coding the daemon, but I have no clue how to implement the daemon in my quickly project. Could I simply paste the files of the daemon in project folder or is there an implementation method for adding new files to a quickly project? Or do I have to create a new project and merge them together?

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• Is ROA a specific form of doing SOA?

  - by JohnDoDo

  I have read somewhere that ROA (Resource Oriented Architecture) is SOA (Service Oriented Architecture) with specific constraints added. SOA is the abstract concept of combining discrete pieces of software and ROA is an implementation of SOA with all of the constraints of RESTful services applied to it: SOA = the concept ROA = the concept + specific implementation details I also had my share of posts saying that ROA is different than SOA, then simply fallback to statements like "ROA is REST" and "SOA is SOAP" and presenting the same more or less pertinent comparisons and differences between SOAP and REST. So just to clear up my confusion: Is ROA a specific form of doing SOA?

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• I need a flexible VPS like gandi.com [duplicate]

  - by Sharen Eayrs

  This question already has an answer here: How to find web hosting that meets my requirements? 5 answers What are the alternative? I do not ask for which one you recommend. I am simply asking for list of similar service. That being said if there is any you've used and happy with please let me know. This is what I am considering http://en.gandi.net/ Some says it's overpriced. It's like amazon aws I think. So I need VPS hosting where I can easily change the CPU requirement, etc.

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• handling the holding of money on a platform

  - by user1716672

  We are building a platform for a client, developed in Yii, where users can top up their account on the platform with money from paypal. Users can upload files and buy access to each others files. User can also gift other users with money. I was thinking that when users top up their account, the money goes rom their Paypal to the merchant account of the website. So all users' money goes to one merchant account. Then, any transactions on the platform are simply recorded on the platform and each users' balance is the maximum amount they can withdraw from the merchant account. Is this the right approach? Legally, are there any problems?

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• How can I really master a programming language?

  - by cprogcr

  I know that learning a language, you can simply buy a book, follow the examples, and whenever possible try the exercises. But what I'm really looking is how to master the language once you've learned it. Now I know that experience is one major factor, but what about learning the internals of the language, what is the underlying structure, etc. There are articles out there saying read this book, read that book, make this game and that game. But to me this doesn't mean to master a language. I want to be able to read other people's code and understand it, no matter how hard that is. To understand when to use a function and when another, etc etc. The list could go on and on but I believe I've made the point. :) And finally, take whatever language as an example if needed, though best would be if C was taken as an example.

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• Google Analytics Content Experiments for non-simultaneous tests

  - by mnort9

  I really like how Google Analytics displays the results of content experiments. However, it seems the tool only works for simultaneous tests. I'd like to use the tool without implementing the page variation code into my site. For example, I want to test copy on an ecommerece category page. The original page variation would be the current page for the past 2500 visits. After making the copy changes, the new variation would be for the next 2500 visits. I realize I can simply record the metrics before and after each variation, but I'd like to take advantage of Google's presentation of the experiment. Is it possible to use the Content Experiments in this way?

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• Saving mobile application data when no service?

  - by Abe Miessler

  Say I have a mobile application that allows users to enter information which is then uploaded to a central location. I had planned on building this using only HTML5 and javascript (non-native app), but I'm assuming if someone is in an area where there is no service they simply will not be able to use the app. As a work around would it be possible to write a native app that saves the information on the device and then uploads it whenever service returns? If so, is it possible to write a native app entirely in HTML5 and Javascript that does this?

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• Do I need the 'w' component in my Vector class?

  - by bobobobo

  Assume you're writing matrix code that handles rotation, translation etc for 3d space. Now the transformation matrices have to be 4x4 to fit the translation component in. However, you don't actually need to store a w component in the vector do you? Even in perspective division, you can simply compute and store w outside of the vector, and perspective divide before returning from the method. For example: // post multiply vec2=matrix*vector Vector operator*( const Matrix & a, const Vector& v ) { Vector r ; // do matrix mult r.x = a._11*v.x + a._12*v.y ... real w = a._41*v.x + a._42*v.y ... // perspective divide r /= w ; return r ; } Is there a point in storing w in the Vector class?

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• How do I install OpenStack?

  - by csgeek

  Supposedly openstack can be installed easily under Ubuntu 12.04 LTS. I've installed 32 and 64bit versions of Ubuntu Server with the same behavior. sudo tasksel check OpenStack hit Okay then I get a tasksel: aptitude failed (100) I've seen: http://www.hastexo.com/resources/docs/installing-openstack-essex-20121-ubuntu-1204-precise-pangolin and https://github.com/EmilienM/doc-openstack documentation, but I was hoping that since it was an LTS released and it was an option in tasksel that I was simply overlooking something obvious and it's just a matter of selecting the right checkbox and hitting okay. Too much wishful thinking?

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• What's wrong with lualatex?

  - by Hooked

  I'm not sure if this is a bug or I've done something wrong (or I simply don't know luatex well enough). This minimal example file test.tex \documentclass{article} \usepackage{luacode} \begin{document} A random number: \begin{luacode} tex.print(math.random()) \end{luacode} \end{document} Should compile with lualatex test.tex but fails with: ! LaTeX Error: File `luacode.sty' not found. It sounds like something was messed up in the installation of luatex. They look to be installed: > dpkg --get-selections | grep luatex luatex install texlive-luatex install The file exists on my system: > locate luacode.sty /usr/local/texlive/2011/texmf-dist/tex/lualatex/luacode/luacode.sty so I'm not how to troubleshoot this. Is the package messed up or is it a problem on my end?

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• Is there a simple shopping cart I can add to my existing website?

  - by Kalessin

  I created a website for my wife, who knits scarves. The site simply displays the 18 different colours she has created, with a Lightbox-like large photo available when clicked. She would now like to give visitors the option to purchase online and pay with PayPal and possibly Google Checkout. We do not need a full ecommerce solution; I've looked at several and they all seem to be overkill for our requirements. We don't even need categories. "All" I want is something that will add products to a cart, take the customer details and integrate the payment provider. So far, the best solution I have found seems to be this script on Codecanyon and I wanted to find out if anyone knows of any better products before I commit to this route. Thanks for your help!

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• Isn't class scope purely for organization?

  - by Di-0xide

  Isn't scope just a way to organize classes, preventing outside code from accessing certain things you don't want accessed? More specifically, is there any functional gain to having public, protected, or private-scoped methods? Is there any advantage to classifying method/property scope rather than to, say, just public-ize everything? My presumption says no simply because, in binary code, there is no sense of scope (other than r/w/e, which isn't really scope at all, but rather global permissions for a block of memory). Is this correct? What about in languages like Java and C#[.NET]?

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• Predicted target location

  - by user3256944

  I'm having an issue with calculating the predicted linear angle a projectile needs to move in to intersect a moving enemy ship for my 2D game. I've tried following the document here, but what I've have come up with is simply awful. protected Vector2 GetPredictedPosition(float angleToEnemy, ShipCompartment origin, ShipCompartment target) { // Below obviously won't compile (document wants a Vector, not sure how to get that from a single float?) Vector2 velocity = target.Thrust - 25f; // Closing velocity (25 is example projectile velocity) Vector2 distance = target.Position - origin.Position; // Range to close double time = distance.Length() / velocity.Length(); // Time // Garbage code, doesn't compile, this method is incorrect return target.Position + (target.Thrust * time); } I would be grateful if the community can help point out how this is done correctly.

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• Are there any free hit counters that don't track users?

  - by David Englund

  Are there any free services that increment a simple hit counter without tracking the users of the site? I would like to know how many visitors there are to my site, excluding bots. I don't need detailed information like unique visitors or where the user is from (in fact, that's exactly what I don't want). I have been researching free hit counters, and it seems that most (all?) of them display advertisements and their terms of service indicate that they can use the data they collect from the client site however they want. Google Analytics also does this and tracks users across sites. The site is static HTML, so an external link or iframe of some sort is easiest for me to implement. I could switch to a Ruby or Node.js back-end, in which case lots of other options open up (like Ruby impressionist and more low-level implementations), but my hosting service is pretty limited. If the answer to my question is simply "no," what are my other options?

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• Make Sprite Jump Upon a Platform

  - by Geore Shg

  I have been struggling to make a game like Doodle Jump where the sprite jumps on a platform. So how do you make a sprite jump upon platforms in XNA? Th platforms are represented by a list of positions like Public platformList As List(Of Vector2) This is the collision detection under update() Dim mainSpriteRect As Rectangle = New Rectangle(CInt(mainSprite.Position.X), CInt(mainSprite.Position.Y), mainSprite.texture.Width, mainSprite.texture.Height) 'a node is simply a class with the texture and position' For Each _node As Node In _gameMap.nodeList Dim blockRect As Rectangle = New Rectangle(CInt(_node.Position.X), CInt(_node.Position.Y), _BlocksTexture.Width, _BlocksTexture.Height) If mainSpriteRect.Intersects(blockRect) Then 'what should I do here? For example velocity and position?' End If If (_node.Position.Y > 800) Then nodeList.Remove(_node) End If Next

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• Why does the sudo command not work in chroot?

  - by katarina

  I just installed a 32-bit chroot to run on my 64-bit system. In the chroot environment, the sudo command doesn't work, it says sudo: command not found Also, when I try the su root command, my password doesn't work (su: authentication failure). What password do they want? I'm quite new to Ubuntu, so actually I don't really know what I'm doing. I am just trying to follow instructions. I solved this particular problem simply by starting the chroot by the command: katarina@ubuntu:~$ schroot -c oneiric_i386 -u root instead of the one I used the first time: katarina@ubuntu:~$ schroot -a I still have some other problems, but I guess that's not for this question.

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• What are good gui guidelines for standard actions (usability)

  - by Michael Durrant

  For example: Delete's should have confirms. Confirmations should be green. Prefer list-of-values over free text whenever possible. This was just a sample. I am looking for references that simply and clearly list common 'should do's' in terms of ui, interactions and usability. My company is new to software development and they keep getting suprised by contractors that don't do the obvious so I am looking for good references about the right way to do it and the basic things to always consider (like the above). Obviously style is subjects, but things like delete confirms shouldn't be.

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• Most efficient way to generate 2D portraits

  - by user1221

  Hey, I am not sure if this is a fitting question for gamedev, or if it is too art related. I am currently trying, to create 2D character protraits for my game. At first I tried to draw them and even though it helped polishing my drawing skills the end result either required way too much time or it simply looked like it was created by a grade school kid. So I am currently looking into some tools which from which people like me who are not out of the art-world might benefit. Especially tools which can create a 3D head+hair, so that I can render them. I have tried several 3D generation tools such as makehead and makehuman to create the basic head-shape. But I have to admit I am not well versed in what other options are available/what has the best quality/etc.

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• Removing CrossOver Games from Unity Start panel

  - by Cássio Amary

  I'm new to Ubuntu and recently installed CrossOver Games Trial on Ubuntu 12.04, didn't like it, tried to uninstall it but simply refused to go away , so I just went on and deleted the folders in the File System. Problem is that now there are 4 icons left on the Unity Start Panel under "installed applications", and I don´t know how to remove it. Actually, could anyone tell me how to delete any shortcut that is created on the Start Panel? Is there a way to do it? Thank you very much!

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• Inputting cheat codes - hidden keyboard input

  - by Fibericon

  Okay, here's what I want to do - when the player is at the main menu, I want them to be able to type in cheat codes. That's the only place I want it to work. I don't want to give them a text box to type into. Rather, I want them to simply type in a word (let's say "cheat", just for simplicity sake) that activates the cheat code. I only need to capture keyboard input when the window is in focus. What can I do to accomplish this?

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• Changing the rendering resolution while maintaining the design layout

  - by Coyote

  I would like to increase the FPS of my project. Currently I would like to try reducing the resolution at which the scenes are rendered. Let's say I never want to draw more than 1280*720. What ever the real resolution is. How should I proceed? I tried pEGLView->setFrameSize(1280, 720); but only reduces the displayed size of the frame on screen (boxing). In my activity I tried setting the size of the "surface" but this seems to completely break the layout (as defined by setDesignResolutionSize). @Override public Cocos2dxGLSurfaceView onCreateView() { Cocos2dxGLSurfaceView surfaceView = new Cocos2dxGLSurfaceView(this); surfaceView.getHolder().setFixedSize(1280, 720); return surfaceView; } Is there a way to simply change the rendered

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• Share buttons vs sharer urls

  - by TeeOh

  As some people might know, adding share buttons from Facebook and Twitter can cause a page to slow down. I've seen many sites pass on the common iframe implementations that these sites offer and simply create icons that link to a sharer url for better control of page performance. http://www.facebook.com/sharer/sharer.php?u=http%3A%2F%2Fwww.cnn.com%2F&t=CNN%26s+website%27 However, I've also read that Facebook is dropping support for these links. For example, this link now redirects to the Like Button. http://www.facebook.com/facebook-widgets/share.php Here is an article noting that Facebook is deprecating/has deprecated it's share functionality and is sticking with the Like button. http://www.barbariangroup.com/posts/7544-the_facebook_share_button_has_been_deprecated_called_it I'm assuming this is the same for the sharing url. If the sharer url is no longer a reliable option, what other methods are there besides using 3rd party widgets (like Addthis)?

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• Mobile traffic of my second site redirected to my base site [Edited,have a look]

  - by Faheem Rasheed

  I have a strange issue with my website and it seems i am unable to understand what cauese the problem.I would highly appreciate your help.The Scenario is I have two websites. Website A Website B Website A is simply hosted within the root directory of my hosting account.Within this root *directory* i have a sub folder " subfolder A " and within which is another subfolder " subfolder B " that contains my site Website B so the path looks like root/sublfolder_A/subfolder_B/ that contains my **Website B ( i.e subfolder_B) ** All goes fine.When i access the website B from my desktop/Laptop Website B is loaded normally. but when i access the Website through a mobile device , mobile site of Website A is loaded while as it should load website_B Also , to let you know , both websites have different URL's and not subdomain's or anything. What could be the problem ? htaccess of website B or website A ? or something else ? Here is the htaccess of my website B RewriteEngine On RewriteRule .* index.php [F] RewriteBase / RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}] RewriteCond %{REQUEST_URI} /component/|(/[^.]*|\.(php|html?|feed|pdf|vcf|raw))$ [NC] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule .* index.php [L]

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