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  • Help to understand directions of sprites in XNA

    - by 3Dkreativ
    If I want to move a sprite to the right and upwards in a 45 degree angle I use Vector2 direction = new Vector2(1,-1); And if the sprite should move straight to right Vector2 direction = new Vector2(1,0); But how would I do if I want another directions, lets say somewhere between this values? I have tested with some other values, but then the sprite either moves to fast and or in another direction than I expected!? I suspect it's about normalize!? Another thing I have problem with to understand. I'm doing a simple asteroids game as a task in a class in C# and XNA. When the asteroids hit the window borders, I want them to bounce back in a random direction, but I can't do this before I understand how directions and Vector2 works. Help is preciated! Thanks!

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  • Already 3,333 tweets...

    Almost everything is about numbers, and this short blog entry includes the number of tweets written so far. ;) Quite frankly, I joined the Twitter bandwagon late... February 2010 or so. And within those 4.5 years I just came across an interesting milestone: 3,333 tweets 3,333 tweets since February 2010 Compared to some of my fellows here from Mauritius that's almost nothing... Anyways, Cheers and for the next 3,333 tweets. This time faster, hopefully.

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  • Having a list of rooms with theirs connection to each other, how do I find isolated room groups?

    - by petervaz
    I'm trying to create a small roguelike and went as far as random generating rooms and corridors. Each room is an instanced object and contain an arraylist of the others rooms connected by a corridor. I can single out unconnected rooms but how can I know the rooms that are connected only to each other but not to most of the others, forming an island? to illustrated better the problem here is an image from the console on a bogged level. Rooms 5 and 6 are connected only to each other. What algorithm can I use to detect that?

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  • "Sorry, Ubuntu 12.04 has experienced an internal error."

    - by malapradej
    I have recently upgraded to Precise and had some errors. It seems to be quite random and with differences in the error reports. I have duly sent the reports hoping the system will have found the problem and sorted itself out. After the second error I am following the wizards (software...) advice and seeking help. The 1st time it happened I jotted down the following: ExecutablePath /usr/lib/tracker/tracker-extract LaunchPad bug 950765 AMD64 The second time the following: ExecutablePath /usr/share/appart/appart-gpu-error-intel.py "Possible GPU hang........" sandybridge-m-gt2 LaunchPad bug 981261 If there is anyone that can help it is much appreciated. I did not really want to upgrade at this stage, but was forced to due to the latest version of python-numpy in precise. You win some, you loose some.... Jacques I am using a Pavilion dv6 notebook and 64bit ubuntu 12.04 LTS

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  • 407 Proxy Authentication Required

    - by user38507
    When I try to install a software using Ubuntu Software center I get: Failed to download repository information Check Your Internet connection When I try to do a apt get-install something, I get: 407 Proxy Authentication Required I use a proxy server that requires a user-name and a password. I have set my systems proxy manually, by plugging in the required numbers in the Networks proxy and applied it system wide. I guess the problem now is plugging in my user-name and password. When I use INTERNET via Mozilla, it specifically asks me for my user-name and password.

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  • The network printer will only print blank pages and will not stop. What should I do?

    - by LibraryGeekAdam
    I work in a library, so we have a Ricoh printer that is networked between all of us. I just recently installed Ubuntu 11.10 64bit on my desktop and have been trying to set up the printer without success. Ubuntu found the printer immediately and allowed me to set it up. When I hit test print, I get one sheet with writing on it and then it prints blank pages and will not stop until I turn off the printer. I tried printing from a document and I get the same one page with writing and then all the blank pages again. Below is what the page says with writing on it. I'd appreciate any help anyone is willing to give. Thanks. %!PS-Adobe-3.0 %% %% mark () () (bunch of numbers) {setuserinfo} stopped cleartomark %%%!

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  • Is there an application which organizes my "Downloads" folder automatically?

    - by rearlight
    I'm looking for an application which puts all files from my Downloads folder into a new generated folder (called like the date) per button press or automatically is able to move files to its destinated directory automatically (p.e. *.png files should be put into /home/user/pictures/random/, *.avi to /videos/, ...) If you are familiar with the DayFolder application: I'm looking for an application like that but for any folder (not only the Desktop). In my case that's Downloads because this folder gets cluttered on my PC very fast. Thanks for your advice/help!

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  • Understanding how to go from a scene to what's actually rendered to screen in OpenGL?

    - by Pris
    I want something that explains step by step how, after setting up a simple scene I can go from that 'world' space, to what's finally rendered on my screen (ie, actually implement something). I need the resource to clearly show how to derive and set up both orthographic and perspective projection matrices... basically I want to thoroughly understand what's going on behind the scenes and not plug in random things without knowing what they do. I've found lots of half explanations, presentation slides, walls of text, etc that aren't really doing much for me. I have a basic understanding of linear algebra/matrix transforms, and a rough idea of what's going on when you go from model space - screen, but not enough to actually implement it in code.

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  • What kind of math should I be expecting in advanced programming?

    - by I_Question_Things_Deeply
    And I don't mean just space shooters and such, because in non-3D environments it's obvious that not much beyond elementary math is needed to implement. Most of the programming in 2D games is mostly going to involve basic arithmetic, algorithms for enemy AI and dimensional worlds, rotation, and maybe some Algebra as well depending on how you want to design. But I ask because I'm not really gifted with math at all. I get frustrated and worn out just by doing Pre-Algebra, so Algebra 2 and Calculus would likely be futile for me. I guess I'm not so "right-brained" when it comes down to pure numbers and math formulas, but the bad part is that I'm no art-expert either. What do you people here suppose I should do? Go along avoiding as much of the extremely difficult maths I can't fathom, or try to ease into more complex math as I excel at programming?

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  • Does anyone have a specific example of using the Flyweight Pattern?

    - by Jeremy E
    I have been studying design patterns and came accross the fly weight pattern. I have been trying to see opportunities to use the pattern in my applications but I am having trouble seeing how to use it. Also, what are some signs that a fly weight pattern is being used when I read other peoples code? According to the definition it says: Use sharing to support large numbers of fine-grained objects efficiently. If I read it right Dictionaries and Hashtables could be instances of fly weights is this correct? Thanks in advance.

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  • algoritm and structure pseucode [closed]

    - by user72759
    Create entries, which administers the test, which is 20 questions, the responses and fixed the 5 correct answer for each question. Write this test, if the execution of the algorithm to each recipe realisations change the order of questions and answers and responses are notified by user enters the correct answer. 2. Writin' example, where the line 2 is used stack. Create a stack of 20 items that the first element is 1, and the next is calculated by the formula an=an-1+1/an-1. Found this stack items that are whole numbers.

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  • Unneeded RAID recovery

    - by Shinhan
    I have two software RAID 5s. Today when I turned on my server (after it was off for two weeks when I was on vacation), I got the message that the software RAID is degraded and was offered RAID recovery console or boot degraded. No idea what to do in that recovery console btw, so I just exited it. After the boot finished normally I took a peak at /proc/mdstat but there is nothing amiss there. So I took a look at mdadm --detail /dev/md0 (and md1) and again everything looks fine with Failed Devices being 0 both times. Next I took a look at smartctl --alll /dev/sdX for all of the drives and Reallocated_Sector_Ct is 0. (Lots of other zeros, all numbers look to me fine) Anybody have any ideas why I'm getting the RAID recovery message on boot when nothing seems bad?

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  • Rotate an object given only by its points?

    - by d33tah
    I was recently writing a simple 3D maze FPP game. Once I was done fiddling with planes in OpenGL, I wanted to add support for importing Blender objects. The approach I used was triangulization of the object, then using Three.js to export the points to plaintext and then parsing the result JSON in my app. The example file can be seen here: https://github.com/d33tah/tinyfpp/blob/master/Data/Models/cross.txt The numbers represent x,y,z,u,v of a single vertex, which combined in three make a triangle. Then I rendered such an object triangle-by-triangle and played with it. I could move it back and forth and sideways, but I still have no idea how to rotate it by some axis. Let's say I'd like to rotate all the points by five degrees to the left, how would a code doing it look like?

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  • Math behind multivariate testing for website optimization

    - by corkjack
    I am looking for theoretical resources (books, tutorials, etc.) to learn about making sound statistical inferences given (plenty of) multivariate website conversion data. I'm after the math involved, and cannot find any good non-marketing stuff on the web. The sort of questions I want to answer: how much impact does a single variable (e.g. color of text) have? what is the correlation between variables? what type of distribution is used for modelling (Gaussian, Binomial, etc.)? When using statistics to analyze results - what should be considered as a random variable - the web-page element that gets different variations or the binary conversion-or-no-conversion outcome of an impression? There's plenty of information about different website optimization testing methods and their benefits\pitfalls, plenty of information about multivariate statistics in general, do you guys know of resources that discuss statistics in this specific context of website optimization ? Thanks for any info!

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  • What is the most compatible, widely used production language to export knowledge and skills gained from Haskell?

    - by World Engineer
    I like Haskell, plain and simple. While Haskell is used in production software, it's not especially widely deployed from what I've seen. What is the most similar and still widely used language in regards to production projects so that I might have a snowball's chance of using something similarly awesome in industry? Also is the same language from the first part available on large numbers of platforms? If not, what is the best alternative that has wide platform deployment? I'd like a single language to put on my to-do list rather than a massive swarm or family. Hard evidence would be a plus.

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  • Kubuntu 13.04 Sound Problems

    - by Michael Nancarrow
    Well, I have already looked into drivers, and sound cards whatnot, but what happens to me is this; sometimes sound wants to play, sometimes it does not! Not via speakers, not via headphones-nothing! I am unsure of what causes this problem, but it is a reoccurring issue through the versions of Kubuntu I run. I do not see any noteable symptoms about this, it is completely random! I have tested it on fresh installs and modified versions and I get the same problem, which annoys me. If updated Flash, tried youtube, tried various video players-the lot! Any help would be appreciated, thanks!

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  • Generate Unique Abstract Backgrounds with Ablaze

    - by Jason Fitzpatrick
    If you want custom and unique backgrounds without having to code your own image-generating engine, Ablaze makes it simple (and fun) to create abstract images. You can customize a wide array of options in Ablaze including the base shape (ring, horizontal line, or random), number of particles, distance each particle travels, and the speed (if you increase the speed range you get more distinct lines and if you decrease it you get smoother smokier shapes). You can also seed the design with a color palette pulled from any image you provide (the sample above was seeded with a Wonder Woman comic panel). Tweak and reset the pattern generation as much as you want; when you create an abstract image worthy of your desktop just click the save button to grab a copy of it in PNG format. Ablaze [via Flowing Data] How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • System.Device.Location.GeoLocation

    - by Aligned
    Originally posted on: http://geekswithblogs.net/Aligned/archive/2013/06/26/system.device.location.geolocation.aspxA co-worker (Scott) sent out this email and it was so good I asked him if I could share it with all of you. I changed the latitude and longitude to random locations to protect the innocent. “Stumbled across this method this morning while coding all the math out by hand to calculate distances. This one is definitely worth filing away for future reference, saved me a ton of work. This was added in v4 of the framework, and is in the core framework install, so should work in services as well as client applications. var location1 = new GeoCoordinate(40.102, -94.788171); var location2 = new GeoCoordinate(50.0011, -96.699148); // distance shown is straight line meters. Console.WriteLine(location1.GetDistanceTo(location2)); Console.ReadKey();   http://msdn.microsoft.com/en-us/library/system.device.location.geocoordinate.getdistanceto(v=vs.100).aspx http://en.wikipedia.org/wiki/Haversine_formula”

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  • Change player in javascript game [migrated]

    - by KLUSTER
    Game: onClick startbutton mathrandom for first player who starts the game. 4 Pictures: 2 of it player1 and player2. another 2 Player turn. need help: on button click next player turn function game(){ var PlayerTurn; PlayerTurn=parseInt(Math.random()*2); if(PlayerTurn==0){PlayerTurn=1;window.document.player1.src="Cache/Player3.PNG";} else{PlayerTurn=0;window.document.player2.src="Cache/Player4.PNG";} } Any help is appreciated.

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  • Xubuntu - Apps Become Unresponsive Intermittently

    - by Levinaris
    Possibly Relevant Information: XUbuntu 12.04 LTS (precise) XFCE 4.8 AMD Graphics (Kernel driver in use: fglrx_pci, Kernel modules: fglrx, radeon) The primary symptom of this issue has been my active rdesktop session to stop responding while everything else appears to work normally. I have been killing rdesktop and re-launching it, with it freezing after a seemingly random time period. The fastest was within seconds. The longest was a couple hours, although it's usually within a few minutes. That being said, I have occasionally seen the terminal and web browsers also become unresponsive to keyboard input. They respond to clicks and will accept middle clicks (to paste text) without issue while remaining unresponsive to the keyboard input. I have been able to restore all functionality, including rdesktop, by switching workspaces and typing on the other workspace, then returning to the original workspace. What is being reset when I do this? What does this work-around/solution indicate may be the problem?

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  • A c++ program that computes the min and max of f(x) for a rectangle inputed by user

    - by StreetBallerX
    So bassicly this is the problem quoted from my teacher : "You have to write a program in C++ that computes the minimal and the maximal value of function f(x,y) obtained on an integer point in a given rectangle [a, b] x [c, d]. Your program should prompt the user to input numerical values of a, b, c and d, as floating point numbers, which are expected to be in a range from -100 thru 100. In case when minimal or maximal values do not exists, your program should output appropriate messages. f(x,y)=x+x*x+x*x*x+y+y*y " So before anyone tell me that i should try do it myself , i'll tell them that ive been trying to do it myself for the past 8 days but my deadline is aproaching and i just cant figure it out its a really simple program but i just cant understand it ... I wont post my attempts because all i saw in these forums is that when someone posts their try and a milion people start to say dont look it this way thry this and bla bla and the guy who posted it was just wondering for minor thing ... so what ever thank you all in advance and thats it :)

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  • When must arbitrary precision arithmetic functions be used in PHP?

    - by Tjorriemorrie
    My colleague uses the Binary Calculator functions in bandwidth calculations; as much as terrabytes, and with percentage splitting on allocation. His usage of these functions appears correct in order not to lose a byte; although he seems to be using them now for everything. The manual only says: For arbitrary precision mathematics PHP offers the Binary Calculator which supports numbers of any size and precision, represented as strings. How much is any size? Is it really necessary? How big is the default float in PHP? Are there any good advice regarding this or things to keep in mind?

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  • Is this a reliable method of parsing glGetShaderInfoLog()?

    - by m4ttbush
    I want to get a list of errors and their line numbers so I can display the error information differently from how it's formatted in the error string and also to show the line in the output. It looks easy enough to just parse the result of glGetShaderInfoLog(), look for ERROR:, then read the next number up to :, and then the next, and finally the error description up to the next newline. However, the OpenGL docs say: Application developers should not expect different OpenGL implementations to produce identical information logs. This makes me worry that my code may behave incorrectly on different systems. I don't need them to be identical, I just need them to follow the same format. So is there a better way to get a list of errors with the line number separate, is it safe to assume that they'll always follow the "ERROR: 0:123:" format, or is there simply no reliable way to do this?

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  • Help assigning product id for e-commerce site? [closed]

    - by Stanford Sequeira
    I am starting an e-commerce marketplace. I am new to e-commerce, but I am taking it up as a challenge. I will have multiple vendors on my site and they will upload their products through CSV files for bulk upload. However there will be certain popular products already listed in the database, they can add those to their listing (like Amazon for 3rd party sellers). I have no idea how to assign product codes for every product, can you help me out? I'm talking about something like Amazon's ASIN number. Or may be is it possible to let vendors assign their own numbers? How does that work?

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  • Placing items randomly in a dynamically generated terrain

    - by Programlocura
    I'm currently working on a 'Tiny wings' like game. I've already asked about the angle of the items in curved lines and i solved (thank you for responses),i'm currently placing the items in random positions, but the terrain it's dynamically and i don't get this working. I've a vector with the points of the terrain, and i'm doing something similar to this (Iterating trough vector): if( _SPManager && i % 15 == 0 && i != 0 ) { if ( _settings.specialPoints && _currentPoints < _settings.specialPoints ) { _SPManager.addPoint( _hillsPosition[i].x , _hillsPosition[i].y ); _currentPoints++; } } But it isn't working as i expected. It isn't displaying the right number of items (Always shows less than i specified). How do i should place the items? Thanks :)

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