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  • How do you set the movement speed of a sprite?

    - by rphello101
    I'm using Slick 2D/Java to play around with graphics. Getting an image to move is easy: Input input = gc.getInput(); if(input.isKeyDown(sprite.up)){ sprite.y--; }else if (input.isKeyDown(sprite.down)){ sprite.y++; }else if (input.isKeyDown(sprite.left)){ sprite.x--; }else if (input.isKeyDown(sprite.right)){ sprite.x++; } However, this is called on every update, so if you hold up, the sprite moves to the edge of the screen in a few hundred milliseconds. Since coordinates are integers, I can't add less than 1 to slow the sprite down. I'm assuming I must have to implement a timer of some sort or something. Any advice?

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  • "Never do in code what you can get the SQL server to do well for you" - Is this a recipe for a bad design?

    - by PhonicUK
    It's an idea I've heard repeated in a handful of places. Some more or less acknowledging that once trying to solve a problem purely in SQL exceeds a certain level of complexity you should indeed be handling it in code. The logic behind the idea is that for the large majority of cases, the database engine will do a better job at finding the most efficient way of completing your task than you could in code. Especially when it comes to things like making the results conditional on operations performed on the data. Arguably with modern engines effectively JIT'ing + caching the compiled version of your query it'd make sense on the surface. The question is whether or not leveraging your database engine in this way is inherently bad design practice (and why). The lines become blurred further when all the logic exists inside the database and you're just hitting it via an ORM.

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  • Efficient algorithm to find a the set of numbers in a range

    - by user133020
    If I have an array of sorted numbers and every object is one of the numbers or multiplication. For example if the sorted array is [1, 2, 7] then the set is {1, 2, 7, 1*2, 1*7, 2*7, 1*2*7}. As you can see if there's n numbers in the sorted array, the size of the set is 2n-1. My question is how can I find for a given sorted array of n numbers all the objects in the set so that the objects is in a given interval. For example if the sorted array is [1, 2, 3 ... 19, 20] what is the most efficient algorithm to find the objects that are larger than 1000 and less than 2500 (without calculating all the 2n-1 objects)?

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  • Showing range on hexagonal grid

    - by user23673
    Here is the situation. I have hexagonal board,and a unit on it,with speed or move value 4.Diffrent terrain has a diffrent cost.When i click on the unit,game should show me a move range. My solution was to check each hex in range of 4,with A* pathfinding,and if path cost was less than 4 then this hex was in range.Finally game nicely show me range of that unit. My question is: Is there other solution to search for range on hex grids or square grid,because even if i am really proud of what i did in my solution,i think,it is a little to exaggerated?:)) What make me ask this question?I noticed that when unit speed is 4 or 6 or even 8,time to computing range for my computer was really good,but when speed was 10 and more i noticed that i needed to wait few second to compute.Well in real games i rather dont see something like this and my A* pathfinding is rather well optimized,so im thinking that my solution is wrong. Thanks for any replies.

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  • MySQL prevents server from booting unless password is entered

    - by ZaneKullman
    I am kind of new with Ubuntu but I have been working on setting up a LAMP server with hamachi as a vpn client for management. The issue is that when we turn the server on or restart it we are required to enter the MySQL password before it will continue. Where can we script a password or disable this? I have attached a partial of less /var/log/boot.log * Starting MySQL ServerESC[204G[ OK ] ....... ok Password: If I haven't provided enough information please just comment and Ill try my best.

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  • What to do about USB support?

    - by RhZ
    USB speeds are consistently slow in ubuntu, and have been for years. I just bought two new machines with usb 3.0, running 10.04, and yet nothing has changed, top speeds are only about 8.0 MB per second and they quickly drop to 2 or less. Its very frustrating. Are there any fixes for this at all? I find almost nothing online. The board is a gigabyte 970A-DS3 motherboard. Is there any driver I should install? I am using brand new usb sticks (kingston) and making sure to plug into the 3.0 (blue) slot.

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  • Is there any simple C++ code to grab video from UVC webcam and display it simultaneously?

    - by mShero
    I'm very very new to Linux and programming! I'm using ubuntu 11.10 - 64 bits with gcc 4.6.1 I've been searching online for an example C++ code that simply grabs video from a compliant UVC webcam and displays it simultaneously.. I need to compile it on gcc. In OpenCV, it's a very simple code less than 20 lines as I remember! I found this: http://v4l2spec.bytesex.org/spec/capture-example.html But it's very huge code relative to OpenCV code ?! and even when I tried to compile it using gcc.. I got many errors! I copied the code into a cpp file: cap.cpp then wrote in the terminal: gcc cap.cpp -o cap and the errors showed up... same errors with g++ I hope if someone can help me and tell me where can I find another simpler code? and how can I test it ? Thank you :)

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  • Google analytics shows wrong number of page views, asp.net website

    - by f_karlsson
    Sometimes it can be for example 4500 requests, after a few hours it shows a few thousand less. What is wrong? It looks like analytics corrects itself. I changed from classic to Universal a few months ago, do not know if it has anything to do with this. In masterpage: <script> (function (i, s, o, g, r, a, m) { i['GoogleAnalyticsObject'] = r; i[r] = i[r] || function () { (i[r].q = i[r].q || []).push(arguments) }, i[r].l = 1 * new Date(); a = s.createElement(o), m = s.getElementsByTagName(o)[0]; a.async = 1; a.src = g; m.parentNode.insertBefore(a, m) })(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga'); ga('create', 'UA-xxxxxxxx-1', 'xxxxx.se'); ga('send', 'pageview'); </script>

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  • Ubuntu 12.04 Running Faster Than Normal

    - by One Zero
    I have just installed a new copy of Ubuntu 12.04 on my laptop . i have noticed that my system is running 4x to 5x faster than normal . i have just install Vmware Desktop & centos for testing something . i have noticed that i has installed in just like less than 1 minute !! My system is booting so fast that after starting my laptop i got GUI in like 10 to 13 sec & shutting down in like 2 to 3 sec & all programs ( Firefox , Chrome , etc ) running so fast that i can see .... The only change i made after installation is cat /proc/sys/vm/swappiness 1 How do I configure swappiness? The System is Dell N 5110 i7 with 8GB of RAM So my question is that what should i look for that why my system running very fast ?

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  • Why I am getting following error when trying to start SDK manager?

    - by rishiag
    I have a 64 bit- 20 GB Ubuntu partition which has very less usable space. So I have put Eclipse in my Ubuntu and downloaded sdks to a folder in my another partition. So when I try to start sdk manager, I am getting the following error in my console: Unexpected exception 'Cannot run program "/media/Data/android-sdks/platform-tools/adb": error=13, Permission denied' while attempting to get adb version from '/media/Data/android-sdks/platform-tools/adb' I have run chmod recursively on android-sdks directory. If I change the address for sdks to Ubuntu partition, sdk manager starts successfully. Is there anything I can do other than increasing the partition size? Thanks

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  • F1 Pit Pragmatics

    Occasionally, you just have to man up and deal with complex systems. In fact, sometimes you just need to sacrifice everything else in the name of performance. In Formula 1 Racing, each car has up to 100 sensors, transmitting around 30Gb of data over the course of a race (70% in real-time). This data is then processed by no less than 3 servers (per car) so that the engineers in the pit have access to telemetry, strategy information, timing feeds, while the servers are exposed to carbon dust, oil,...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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  • Why does Linq to Entity Sum return null when the list is empty?

    - by Hannele
    There are quite a few questions on Stack Overflow about the Linq to Entity / Linq to SQL Sum extension method, about how it returns null when the result set is empty: 1, 2, 3, 4, 5, 6, 7, and many more, as well as a blog post discussing the issue here. Now, I could go a flag these as duplicates, but I feel it is still an inconsistency in the Linq implementation. I am assuming at this point that it is not a bug, but is more or less working as designed. I understand that there are workarounds (for example, casting the field to a nullable type, so you can coalesce with ??), and I also understand that for the underlying SQL, a NULL result is expected for an empty list. But because the result of the Sum extension for nullable types is also not nullable, why would the Linq to SQL / Linq to Entity Sum have been designed to behave this way?

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  • how to get bash to stop escaping $ during tab-completion?

    - by keturn
    I have this on the command line: ln -sf $PWD/wine- and then I hit tab to complete the filename. In earlier versions of Ubuntu, this worked just fine to complete the wine- filename (and as a side-effect $PWD would be expanded at that time). But now it turns it in to ln -sf \$PWD/wine- which isn't what I meant at all and doesn't complete anything as the file does not literally start with $. How do I get completion back to the less broken behaviour? set tells me these are my current settings: BASHOPTS=checkwinsize:cmdhist:expand_aliases:extquote:force_fignore:hostcomplete:interactive_comments:progcomp:promptvars:sourcepath SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor

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  • Collision for mobile game

    - by zemiguel12
    I'm writing a little game in as3 using Starling, and I need to check collision between 2 boats that can rotate. I don't need the pixel perfect collision, but bounds collision is not enough too. The boat look more or less like this: I was thinking about create one square on the back of the boat and a triangle on the front, than for each boat, check if the square collide with the other boat square or triangle, and the same for the triangle. I just don't know how to do that, I don't know if it's possible with the Shape.hitTest, or if it's the best way to do that. What can I do?

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  • DotNetNuke 5.4.0 Released.

    I am pleased to announce the release of DotNetNuke 5.4.0. This release comes hot on the heals of the 5.3.0 and 5.3.1 releases and is aimed at providing ASP.Net 4.0 support to coincide with the Visual Studio 2010 launch. This release also includes enhanced localization support and additional taxonomy support. While less than a month has passed since the last major release, we felt it was important to support ASP.Net 4.0 very close to the platform launch which necessitated back to back major releases....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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  • 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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  • How can I change the percent of screen brightness that changes every time I press the shortcut?

    - by Chriskin
    When I press Fn+F6 the change in brightness is too big. How can I make it move less than it does now? (Let's say, half that, for example.) (11.04/Gnome. I'm on proprietary nvidia drivers.) EDIT: I haven't tried what Rinzwind has written below because , after throwing a cup of coffee on my laptop, my keyboard was destroyed (so i no longer have the FN button that is needed - i'm currently writing from an external one). I have already ordered a new one and i will collect it from the service center tomorrow at noon

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  • MMORPG Server architecture: How to handle player input (messages/packets) while the server has to update many other things at the same time?

    - by Renann
    Yes, the question is is very difficult. This is more or less like what I'm thinking up to now: while(true) { if (hasMessage) { handleTheMessage(); } } But while I'm receiving the player's input, I also have objects that need to be updated or, of course, monsters walking (which need to have their locations updated on the game client everytime), among other things. What should I do? Make a thread to handle things that can't be stopped no matter what? Code an "else" in the infinity loop where I update the other things when I don't have player's input to handle? Or even: should I only update the things that at least one player can see? These are just suggestions... I'm really confused about it. If there's a book that covers these things, I'd like to know. It's not that important, but I'm using the Lidgren lib, C# and XNA to code both server and client. Thanks in advance.

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  • Java EE @ NFJS Central Iowa Software Symposium Des Moines

    - by reza_rahman
    As some of you may be aware I recently joined the well-respected US based No Fluff Just Stuff (NFJS) Tour. The NFJS Central Iowa Software Symposium was held August 8 - 10 in Des Moines. The Des Moines show is one of the smaller ones but still was good overall. It is one of the few events of it's kind that take place this part the country so it is extremely important. I had five talks total over two days, more or less back-to-back. I had decent attendance for all my sessions and had many of the same folks staying for multiple sessions which is always a very good sign. I did talks on Java EE 7/Java EE 8, WebSocket, the Cargo Tracker Java EE Blue Prints, JavaScript + Java EE and NoSQL + Java EE. More details, including slide decks and code as well as my NFJS tour schedule, posted on my personal blog.

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  • Ubuntu 12.04 VM goes dead unexpectedly

    - by pyInTheSky
    I'm not a super savvy super user, so I'm not sure what to look for. I have a vm running 12.04. It runs fine, and then just dies (no ping, no ssh). When I log into vmwaresphere, I see the vm still 'UP', but the console gives me a response-less black screen. This lead me to believe that Ubuntu was going into some sort of sleep/hibernate state. I double checked the power settings and found nothing out of the ordinary, so now I'm stuck on how to fix the problem. There are 5-7 (centos-5.8 & 6) machines running on the same server/vm setup with no problems at all. thanks.

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  • what is the best way to add avoidance behaviour to an AI framework?

    - by SirYakalot
    I have a small AI framework for a shooting based game. Although this is rarely needed, as when agents are close to each other they are usually fighting, I would none the less like some way of implementing avoidance behaviour. For example, if in the future I wanted to take away their weapons and have many of them wonder around in a crowd, how would I make them not hit / pass through each other, but instead avoid each other? two ideas I had would be to add steering behaviour and allow that to deviate from their path, or to use a dynamic pathfinding technique. Are there better ways? What is the more respected practice?

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  • Why does Linq to Entity Sum return null when the result set is empty?

    - by Hannele
    There are quite a few questions on Stack Overflow about the Linq to Entity / Linq to SQL Sum extension method, about how it returns null when the result set is empty: 1, 2, 3, 4, 5, 6, 7, and many more, as well as a blog post discussing the issue here. I feel it is an inconsistency in the Linq implementation. I am assuming at this point that it is not a bug, but is more or less working as designed. I understand that there are workarounds (for example, casting the field to a nullable type, so you can coalesce with ??), and I also understand that for the underlying SQL, a NULL result is expected for an empty result set. But because the result of the Sum extension for non-nullable types is also non-nullable, why does the Linq to SQL / Linq to Entity Sum behave this way?

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  • Google Analytics account setup for multiple personal websites?

    - by User
    I have multiple personal websites that I develop and plan to develop more over time. The number of websites is currently greater than one but less than 50. Currently I have a single Google account with a single analytics account that has a web property for each of my sites. My understanding is that you can have up to 25 analytics accounts attached to a single google account and each of those 25 acccounts can have up to 50 web properties in them which would allow me to track up to 1,250 sites. I don't think I'll be hitting that number anytime soon, however are there other reasons to structure accounts differently, such as using a separate google account for each site and then adding myself as an administrator?

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  • Website Redirects [on hold]

    - by user40393
    I've been having a bit of an issue today. I run Gematsu.com. At first I thought the site has been going slow all day due to the amount of hits we've been getting the past couple days. But then I realized we'd received even less today, so something wasn't adding up. I ran a check on a website testing site.Turns out I have a bunch of redirects from URLs that I've never heard of. I don't know if they're what's slowing the site down, but I can tell you the site wasn't taking a minute to load yesterday. I tried removing my advertising to see if it was anything on their end, but I still got largely the same results.

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  • Which countries have suitable laws for game development companies? [on hold]

    - by yoni0505
    Which countries are most suitable for game companies? By suitable I mean: Their laws let the business be more profitable. (for example: low taxes) Have less bureaucracy. (for example: creating a company, employment laws) Living there isn't expensive. (for example: rent and food prices) etc... In short - maximum revenue with minimum overhead. What other things do I have to consider when choosing the place to be in? Are there any articles about this subject? (I couldn't find any)

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