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  • I am not the most logically-organized person. Do I have any chance at being a good 'low-level' programmer?

    - by user217902
    Background: I am entering college next year. I really enjoy making stuff and solving logical problems, so I'm thinking of majoring in compsci and working in software development. I hope to have the kind of job where I can work with implementing / improving algorithms and data structures on a regular basis.. as opposed to, say, a job that's purely concerned with mashing different libraries together, or 'finding the right APIs for the job'. (Hence the word 'low-level' in the title. No, I don't wish to write assembly all day.) Thing is, I've never been the most logically-sharp person. Thus far I have only worked on hobby projects, but I find that I make the silliest of errors ever so often, and it can take me ages to find it. Like anywhere between three hours to a day to locate a simple segfault, off-by-one error, or other logical mistake. (Of course, I do other things in the meantime, like browsing SO, reddit, and the like..) It's not like I'm 'new' to programming either; I first tried C++ maybe five years ago. My question is: is this normal? Should a programmer with any talent solve it in less time? Having read Spolsky's Smart and gets things done, where he talks about the large variance in programming speed, am I near the bottom of the curve, and therefore destined to work in companies that cannot afford to hire quality programmers? I'd like to think that conceptually I'm okay -- I can grasp algorithms and concepts pretty well, I do fine in math and science, although I probably drop signs in my equations more often than the next guy. Still, grokking concepts makes me happy, and is the reason why I want to work with algorithms. I'm hoping to hear from those of you with real-world programming experience. TL;DR: I make many careless mistakes, should I not consider programming as a career?

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  • How to fix Black screen?

    - by stupidwhiteguy
    so I recently had my question deleted and merged into a standard how to for blank screens. I am relatively new to This type of computer work and i don't understand the steps nessary to diagnose my problem well enough to solve it so this help full how to has me feeling helpless I can use Ctrl + Alt +F1 and log in So how do I use sudo commands to fix the blank screen on my old dell? sudo lsoci -nn tells me my video card is a ATI rage 128 pro ultra tf /var/log/Xorg.0.log tells me Permission denied that is all i get Sudo apt-get install --reinstall unity tried thay also have also tried Apt-get update and upgrade Please dont close this question without providing an actual answer or if you think it is an exact duplicate provide a solution that worked for that question. I see a lot of these questions as closed and there is no real answer given I will try any solutions available and report results so that others can also solve problems not be overwhelmed by overly broad troubleshooting guides that do nothing to help solve specific issues The nomodeset change from quiet splash also yields no results on reboot I still get a blank screen this screen still has contorl alt f1 abilities but that is it contorl alt f8 causes blinking cursor and F7 gets a crazy flash with green and blue then blank screen Contorl alt f1 a log in prompt in text only when run in recovery mode with failsafe graphics its says the syestem is running in low graphics mode your screen graphics card and input device settings could not be detected correctly. You will need to configure these your self how do i do that? I got this /var/log/failsafeX-backup-120909200641.tar as the location of my log files but i have no idea how to axcess sounds work in blank screen also screen responds or flashes after log in is typed and password entered really any help is good I don't even know where to start I believe 12.04 is installed and functioning but i don't think I can see it at the end of the error log it says error setting mtrr (base= oxf0000000, size= 0x01000000, type=1) inappropriate ioctl for device(25) i have tried to provide as much info as I understand how to provide

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  • How to animate the sprite along with action in Cocos2d?

    - by user1201239
    Cocos2d-android - I have an animation which has 5 Frames they are close cropped images. Now I want Sprite to do animation as well as Move in X direction.i.e. I have a player running which gets collided with obstacle and falls down .. Now I want sprite to run animation as well as moveBy in -ve x direction gameOverAnimation =CCSprite.sprite("gmovr00") gameOverAnimation.setAnchorPoint(0, 0); gameOverAnimation.setPosition(340.0f, 200.0f); addChild(gameOverAnimation,10); CCIntervalAction action1 = CCAnimate.action(mEndAnimation, false); action1.setDuration(1.0f); CCIntervalAction delay = CCDelayTime.action(0.68f); CCMoveBy actionBy = CCMoveBy.action(1.0f, CGPoint.ccp(-340,0)); CCIntervalAction seq1 = CCSpawn.actions(action1,actionBy); //CCSpawn spawn = CCSpawn.actions(action1, actionBy); CCSequence sequence1 = CCSequence.actions(seq1,CCCallFuncN.action(this,"gameOver")); gameOverAnimation.runAction(sequence1); Above code makes animation run first then moved in y direction Thanks for the help.. And can some one explaing me the concept of time with frame Animation or good example ?

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  • How do I troubleshoot system slowness seen when viewing PDFs or videos?

    - by asp
    Whenever I watch videos, either online of local via Totem and/or open PDF files using evince. The system gets really, really bogged down. All apps get really slow, menus take forever to display, switching windows gives me time to make a coffee, etc. I have a couple of bug reports open on this, but what do I need to do to really troubleshoot the issue? I've purged Adobe Flash from the system, but YouTube HTML5 videos still have the issue. A bunch of PDFs saved locally trigger the problem. And to (temporarily) remove the slowness, I need to shutdown the computer, breath for a few minutes, then restart. A simple reboot does not do the trick. How can I identify the cause? This only started on 13.04. I've had Ubuntu on this machine for a year without a problem until "upgrading" to 13.04. I am not a programmer, but I suspect an issue with the Intel video driver. Is there something I can run which will diagnose this, or are there concrete steps I can follow to find the culprit?

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  • JavaOne Technology Conference Is Coming to Russia

    - by Tori Wieldt
    JavaOne Russia 17-18 AprilRussian Academy of Sciences, MoscowRegister Now JavaOne and Oracle Develop 2012 Russia offers a wide variety of sessions, hands-on labs, keynotes, demos, and the opportunity to network with developer peers. If you’re looking for in-depth sessions on Java technologies and tools, this is the conference for you. Your registration also gets you into Oracle Develop sessions as well, so you can learn about application servers, cloud development and, of course, database development. The JavaOne Russia tracks are:Client-Side Technologies and Rich User ExperiencesLearn about developments in Java for the desktop and practices for building rich, immersive, and powerful user experiences across multiple hardware platforms and form factors. Core Java PlatformDiscover the latest innovations in Java virtual machines. Get deep technical explanations in security and networking and enhancements that allow dynamic programming languages to drive Java platform adoption. Java EE Web Profile, Platform Technologies, Web Services, and the Cloud Update your knowledge on topics such as Web application development, persistence, security, and transactions. This track will also address modularity, enterprise caching, Web sockets, and internet identity. Mobile, Java Card, Embedded, and DevicesThis track is devoted to Java technology as the ultimate platform for mobile computing. It also covers embedded and device usages of Java technologies, including Java SE, Java ME, Java Card, and JavaFX. Share this event: #oracleRU

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  • What are some good tips for a developer trying to design a scalable MySQL database?

    - by CFL_Jeff
    As the question states, I am a developer, not a DBA. I have experience with designing good ER schemas and am fairly knowledgeable about normalization and good schema design. I have also worked with data warehouses that use dimensional modeling with fact tables and dim tables. However, all of the database-driven applications I've developed at previous jobs have been internal applications on the company's intranet, never receiving "real-world traffic". Furthermore, at previous jobs, I have always had a DBA or someone who knew much more than me about these things. At this new job I just started, I've been asked to develop a public-facing application with a MySQL backend and the data stored by this application is expected to grow very rapidly. Oh, and we don't have a DBA. Well, I guess I am the DBA. ;) As far as designing a database to be scalable, I don't even know where to start. Does anyone have any good tips or know of any good educational materials for a developer who has been sort of shoved into a DBA/database designer role and has been tasked with designing a scalable database to support an application like this? Have any other developers been through this sort of thing? What did you do to quickly become good at this role? I've found some good slides on the subject here but it's hard to glean details from slides. Wish I could've attended that guy's talk. I also found a good blog entry called 5 Ways to Boost MySQL Scalability which had some good information, though some of it was over my head. tl;dr I just want to make sure the database doesn't have to be completely redesigned when it scales up, and I'm looking for tips to get it right the first time. The answer I'm looking for is a "list of things every developer should know about making a scalable MySQL database so your application doesn't perform like crap when the data gets huge".

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  • What are some good ways for an intermediate programmer to build skills?

    - by Jordan
    Preface: I work mostly in Python, and Web Dev languages (HTML, CSS, Javascript and Jquery, PHP) I'm proficient at coding but I want to get better. In larger more advanced projects my programming skills break down. The more code there is the more trouble I have fitting all the pieces together. I understand syntax well, and I can catch and correct errors fairly easier. But the more advanced it gets the more I struggle. I believe I have a good understand of the basic and nuts and bolts of programming and I understand what's going on, but when it comes to larger projects, especially ones with heavy math involved my confidence flags and I start making mistakes. It's not that I can't do it, I'm just not used to doing it. Does anyone have any advice for someone who knows programming, but wants to get better? The only tutorials I can really find are beginner basic type stuff. Basically what I'm saying is I want to be confident when I'm tackling advanced projects, but I can't because I have little experience dealing with difficult situations.

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  • ubuntu 12.10 Lenovo b570e, WiFi connected but not working

    - by koogee
    I'm running ubuntu 12.10 liveUSB on a lenovo b570e. It has an atheros wifi card that connects with my home network but I can't browse AT ALL. My network is multiple clients --> router --> isp modem --> Internet I can ping my router (192.168.0.1) but not my isp's modem(192.168.15.1). I have 3 other computers connected to the same router that are working fine (infact i'm posting from one) ping -c 3 google.com unknown host google.com ping -c 3 8.8.8.8 shows 100% packet loss I think its some networking issue. I tried directly connecting it to the router via ethernet cable but same issue. It gets an ip, shows LAN connected but can't browse. If I connect it directly to the isp modem via ethernet cable it starts working fine. Connection Information shows: Interface: 802.11 wifi (wlan0) driver: ath9k security: wpa/wpa2 speed: 150mb/s ip: 192.168.0.106 broadcast: 192.168.0.255 subnet:255.255.255.0 default route: 192.168.0.1 primary dns: 192.168.15.1 i have restarted the router and modem many times. Rebooted the LiveUSB many times.

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  • Developing with Oracle ADF Mobile and ADF Business Components Backend

    - by Shay Shmeltzer
    It's great to finally have the Oracle ADF Mobile solution out there. If you are not familiar with ADF Mobile - it basically lets you build applications that run on iOS and Android devices using the concepts you already know - components based UI constructions (same idea as JSF), taskflows, data controls, Java and of course JDeveloper. I created one demo that shows how to build an on-device application that gets data from local Java files (that run on the device - yes we do Java on iOS too) - you can see it here. However, one thing many of you might be wondering is how can you get data from your database into these mobile applications. Well if you already built your data access with Oracle ADF Business Components then here is a two step video demo that shows you what to do. The steps are: 1. Expose ADF Business Components as Services 2. Create an ADF Mobile application that consumes the above services with the Web service data control Simple right? That's the whole point of ADF Mobile - making on device application development as simple as possible. Try it out on your device.

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  • How do I dissuade users from using the same password with similar systems?

    - by Resorath
    I'm building a web application that connects to other web services (using strictly anonymous binding, so no user passwords are being used). However the web application maintains its own users itself, and is required to ask certain details such as e-mail addresses and public linking information to these other web services (for example, a username but not a password). I want to deter or prevent users from reusing passwords in my application that they have also used in the applications I'm linking to. For example, if I ask for their e-mail and provide me with their gmail address, I don't want them using their gmail password for my system. Another example would be reusing a password to a linked system in which they also gave me their username. One idea I had was to simply try using the information they gave me, along with the password they are trying to store and log in to these external web applications to test the password - then immediately unbind if I was successful and ask the user to use a different password. However I suspect there is a host of morale and legal issues there. The reason this is a big deal to me is accountability. My application is simply not funded enough to invest properly in security around user passwords. A salted, hashed password in a public SQL-like database is as secure as it gets. So if passwords and linked usernames or e-mails get out, I don't want my userbase compromised.

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  • Run script at user login as root, with a catch

    - by tubaguy50035
    I'm trying to run a PHP script as root on user login. The PHP script adds a Samba share to the Samba config, thus the need for root privileges. The only issue here, is that the user doesn't exist yet. This system is integrated with active directory. So when a user logs in for the first time, a home directory for them is created under /home/DOMAIN/username. I've found this question and that seems like the correct way to get what I want, but I'm having trouble with the syntax since I don't know the user's name. Would it be something like: ALL ALL=(ALL) NOPASSWD: /home/DOMAIN/*/createSambaShare.php This doesn't seem to work as it is currently. Anyone have any ideas or a "scripted" way to add a Samba share on user login? Since I've made other changes to /etc/skel, I just added the bash necessary to run the PHP script in .profile in there. This then gets copied to the "new" user's home and it tries to run the PHP script. But it fails, because these are not privileged users. Changing permissions on the PHP script will not help. It needs to be run as sudo because it opens the Samba config file for writing. Letting any user run the PHP script would result in a PHP error. The homes Samba directive doesn't work for my use case. I need the Samba share to exist once they exist on the server, even when they're not logged in.

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  • NFS users getting a laggy GUI expierence

    - by elzilrac
    I am setting up a system (ubuntu 12.04) that uses ldap, pam, and autofs to load users and their home folders from a remote server. One of the options for login is sitting down at the machine and starting a GUI session. Programs such as chormium (browser) that preform many read/write operations in the ~/.cache and ~/.config files are slowing down the GUI experience as well as putting strain of the NFS server that is causing other users to have problems. Ubuntu had the handy-dandy XDG_CONFIG_HOME and XDG_CACHE_HOME variables that can be set to change the default location of .cache and .config from the home folder to somewhere else. There are several places to set them, but most of them are not optimal. /etc/environment pros: will work across all shells cons: cannot use variables like $USER so that you can't make users have different new locations for .cache and .config. Every users' new location would be the same directory. /etc/bash.bashrc pros: $USER works, so you can place them in different folders cons: only gets run for bash compatible shells ~/.pam_environment pros: works regardless of shell cons: cannot use system variables (like $USER), has it's own syntax, and has to be created for every user

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  • Slopes in 2D Platformer

    - by Carlosrdz1
    I'm dealing with Slopes in a 2D platformer game I'm developing in XNA Game Studio. I was really tired of trying without success, until I found this post: 45° Slopes in a Tile based 2D platformer, and I solved part of the problem with the bummzack answer. Now I'm dealing with 2 more problems: 1) Inverted slopes: The post says: If you're only dealing with 45 degree angles, then it gets even simpler: y1 = y + (x1 - x) If the slope is the other way round, it's: y1 = y + (v - (x1 - x)) My question is, what if I'm dealing with slopes with less than 45 degree angles? Does y1 = y + (v - (x1 - x)) work? 2) Going down the slope: I can't find a better way to handle the "going down through the slope" situation, considering that my player can accelerate its velocity. Edit: I was about to post a image but I guess I need to have more reputation he he he... What I'm trying to say with "going down" is like walking towards the opposite direction, assuming that if you are walking to the right, you are incrementing your Y position because you are climbing the slope, but if you are walking to the left, you are decrementing your Y position.

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  • jquery ondrag map load only what has not been viewed

    - by David
    When a person mouse down, moves the mouse, and mouses up the system gets the different in the mouse down coord and the mouse up coords and loads in the new map items. However, the problem is it loads them every time so I want a way to track what has been loaded without too much work on checking or storing checks. Most promising. Came up with while typing this. Section the screen into 250x250 sectors and check if that sector has been loaded. Keep track of each corner of the screen and see if there is an area of those that have not loaded. Keep a record of the corners of the screen. When mouse up coords are greater then load the different. Problem is if they are at coord 10,000 then it will load from -10k to 10k positive and that is a lot of items to load. Check every item on the page to see if it is loaded. If I do this I might as well reload the whole page. If anyone has some suggestions; feel free to pass them on.

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  • How to customize live Ubuntu CD?

    - by karthick87
    I would like to customize Ubuntu live CD by installing some additional packages. I have followed this link but it doesn't seems to work. Can anyone provide clear instructions? Thanks in advance! Customization Packages that I want to install: Thunderbird Samba SSH Changes that I need: Remove Games menu from the Application menu Firefox shortcut on desktop Radiance as the default theme Different default Ubuntu wallpaper Note I do not prefer Remastersys, manual way will be appreciated. updates I want the panel to be placed at the bottom. I want to paste my samba configuration file instead of default samba configuration. And i have few firefox shortcuts and Folders, i have to show that in Desktop. Also it will be nice if you say me how to change the icon sets. Recent Updates I have customized ubuntu 10.10 with firefox shortcuts and few folders on desktops. Everything went smooth. But the installer gets crashes after choosing the timezone. How do i fix this issue? Also setting wallpaper affects the login screen. The wallpaper which i set is displayed on the login screen also. I just want the default one for the login screen.

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  • Is it better to have multiple domains for cities or one single TLD?

    - by Brett
    I make websites for small businesses, and for some reason business owners love to have several domains with the same website but the TLD containing the city name. For example: 1. smallbizname.com 2. clevelandsmallbizname.com 3. columbussmallbizname.com 4. cincinnatismallbizname.com ... and so on. I've seen questions about localization per country aspects, but this is a much smaller scale, so I don't think the same rules apply. The problem I have is the companies never want to write separate content per domain, just have the same website hosted several times at each domain. I feel this probably hurts SEO for two reasons: 1. Traffic gets scattered throughout domains, could be boosting just one domain. 2. Duplicate content penalty because the content is identical. My question boils down to this... Should I redirect all the city domains to the main business name domain, or does having these separate sites help to rank better per city? And if they are redirected, how does google rank the redirects? Thanks for any input on this issue!!

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  • Problems after installing a plethora of updates

    - by box
    yesterday I decided to install 32-bit Ubuntu on my 64-bit desktop, first of all, is that a problem? After installing, i had around 270 updates to install, according to the update manager. I was having trouble launching a game with WINE, so I thought updating might help. After updating, I restarted my computer, and after a long while it showed me my desktop and the icon's on it, but I didn't get anything else. I didn't have the "taskbar" (not sure what it's called, sue me) on the left side, nor the bar at the top. I also received an error message saying some program had stopped working. I decided to restart my computer again, and that was when it told me that i have to re-configure my drivers, or run in "Low Graphics" mode for one session, amongst other options. Well, I decided to try to revert to the "basic video drivers", which was an option it gave. Restarting the computer gave me the same problem as in the second paragraph. After a few more restarts and a night of restless sleep, here I am trying to start my computer again, only to receive a black screen, and my monitor "going to sleep". I'm sort of stumped here, being new to Ubuntu (desktop, at least) and I really hope this gets fixed without me having to install Ubuntu on yet another partition (I have three other partitions for various things already) tl;dr: Black screen on boot after installing updates.

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  • Why isn't one of the constant buffers being loaded inside the shader?

    - by Paul Ske
    I however got the model to load under tessellation; only problem is that one of the constant buffers aren't actually updating the shader's tessellation factor inside the hullshader. I created a messagebox at the rendering point so I know for sure the tessellation factor is assigned to the dynamic constant buffer. Inside the shader code where it says .Edges[1] = tessellationAmount; the tessellationAmount is suppose to be sent from the dynamic buffer to the shader. Otherwise it's just a plain box. In better explanation; there's a matrixBuffer, cameraBuffer, TessellationBuffer for constant. There's a multiBuffer array that assigns the matrix, camera, tesselation. So, when I set the Hull Shader, PixelShader, VertexShader, DomainShader it gets assigned by the multibuffer. E.G. devcon-HSSetConstantBuffers(0,3,multibuffer); The only way around the whole ideal would be to go in the shader and change how much the edges tessellate and inside the edges as well with the same number. My question is why wouldn't the tessellationBuffer not work in the shader?

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  • Wireless switch on Dell XT2 - strange behaviour of rfkill

    - by DyP
    I have an Dell Latitude XT2 using an Intel WLAN card (lspci lists it as "Intel Corporation Ultimate N WiFi Link 5300") running Lubuntu 12.04 with recent updates. The laptop has a hardware WLAN switch. I have problems activating the WLAN when booting with the hardware switch set to "off". The situation is a bit confusing, unfortunately. rfkill lists two WLAN devices (though lspci only shows the Intel one). This is the situation when booting with the hardware switch set to "Off": 0: dell-wifi: Wireless LAN Soft blocked: yes Hard blocked: yes 1: dell-bluetooth: Bluetooth Soft blocked: yes Hard blocked: yes 2: phy0: Wireless LAN Soft blocked: yes Hard blocked: yes From some tests, I conclude WLAN is only activated when both, the dell-wifi and phy0, are unblocked by soft- and hardware. But I can only unblock dell-wifi after the hardware switch is set to "on". Procedure right from boot with hardware switch set to "Off": Soft-unblocking phy0 works as expected. Could be done by start-up script. sudo rfkill unblock 0: nothing happens. Soft block of dell-wifi not removed. Set the hardware switch to "on": phy0 gets its hard block removed. Still no WLAN. sudo rfkill unblock 0: both the soft and hard lock of dell-wifi are removed. WLAN is now active and works. sudo rfkill block 0: only adds the soft block as expected. WLAN goes off again. So, in order to activate WLAN, I have to use the hardware switch and afterwards (manually) run a script - that's a bit inconvenient. Does someone know a better solution? Maybe a daemon could help that listens to rfkill events to unblock dell-wifi after I have set the hardware switch to "on"? (sounds like another workaround) When booting with the hardware switch set to "On", nothing is blocked neither hard nor soft.

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  • Deploying InfoPath forms &ndash; idiosyncrasies

    - by PointsToShare
    Well, I have written a sophisticated PowerShell script to expedite the deployment of InfoPath forms - .XSN file.  Along the way by way of trial and error (mostly error and error), I discovered a few little things. Here they are. •    Regardless of how the install command is run – PowerShell or the GUI in Central Admin – SharePoint enwraps the XSN inside a solution – WSP, then installs and deploys the solution. •    The solution is named by concatenating “form-“ with the first 16 characters (or less if the file name is shorter than 16) of the file name and the required WSP at the end. So if the form name was MyInfopathForm.xsn the solution name will be form-MyInfopathForm.wsp, but for WithdrawalOfRequestsForRefund.xsn it will be named form-WithdrawalOfRequ.wsp •    It only gets worse! Had there already been a solution file with the same name, Microsoft appends a three digit number to the name, like MyInfopathForm-123.wsp. Remember a digit is a finger, I suspect a middle finger, so when you deploy the same form – many versions of it, or as it was in my case – testing a script time and again, you’ll end up with many such digit (middle finger) appended solutions, all un-deployed except the last one. This is not a bug. It’s a feature!   Well, there are ways around it. When by hand, remove the solution from the solution store before deploying the form again. In the script I do the same thing. And finally - an important caveat; Make sure that all your form names are unique in the first 16 characters. If you also have a form with the name forWithdrawalOfRequestForRelief.xsn, you’re in trouble! That’s all folks!

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  • Who should have full visibility of all (non-data) requirements information?

    - by ebyrob
    I work at a smallish mid-size company where requirements are sometimes nothing more than an email or brief meeting with a subject matter manager requiring some new feature. Should a programmer working on a feature reasonably expect to have access to such "request emails" and other requirements information? Is it more appropriate for a "program manager" (PGM) to rewrite all requirements before sharing with programmers? The company is not technology-centric and has between 50 and 250 employees. (fewer than 10 programmers in sum) Our project management "software" consists of a "TODO.txt" checked into source control in "/doc/". Note: This is nothing to do with "sensitive data access". Unless a particular subject matter manager's style of email correspondence is top secret. Given the suggested duplicate, perhaps this could be a turf war, as the PGM would like to specify HOW. Whereas WHY is absent and WHAT is muddled by the time it gets through to the programmer(s)... Basically. Should specification be transparent to programmers? Perhaps a history of requirements might exist. Shouldn't a programmer be able to see that history of reqs if/when they can tell something is hinky in the spec? This isn't a question about organizing requirements. It is a question about WHO should have full VISIBILITY of requirements. I'd propose it should be ALL STAKEHOLDERS. Please point out where I'm wrong here.

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  • 'Buy the app' landing page implementations

    - by benwad
    My site (using Django) has an app that I'm trying to push - I currently have a piece of middleware that redirects the user to a page advertising the app if they're accessing the page on the iPhone, then setting a cookie so that the user isn't bugged by the message every time they visit the site. This works fine, however checking the page with the mobile Googlebot checker shows that the Googlebot gets stuck in the redirect (since it doesn't store cookies) and therefore won't index the proper content. So, I'm trying to think of an alternative implementation that won't hurt the site's Google ranking and won't have any other adverse effects. I've considered a couple of options: Redirect (the current solution), but don't redirect if the user agent matches the Googlebot's UA string. This would be ideal, however I'm not sure if Google like their bot being treated differently from other users, and I'm afraid the site's ranking may be somehow penalised if I go ahead with this. Use a Javascript popup instead of a redirect. This would make sure the Googlebot finds the content it needs, however I envision this approach causing compatibility issues with the myriad mobile devices/browsers out there, and may affect the page load time. How valid are these options? And is there a better option for implementing this feature out there? I've tried researching this topic but surprisingly can't find any reputable-looking blog posts that explore this topic. EDIT: I posted this on SF because it seemed unsuitable for SO, but if there's another site that would be better for this issue then I'd be happy to move the question elsewhere.

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  • How do 2D physics engines solve the problem of resolving collisions along tiled walls/floors in non-grid-based worlds?

    - by ssb
    I've been working on implementing my SAT algorithm which has been coming along well, but I've found that I'm at a wall when it comes to its actual use. There are plenty of questions regarding this issue on this site, but most of them either have no clear, good answer or have a solution based on checking grid positions. To restate the problem that I and many others are having, if you have a tiled surface, like a wall or a floor, consisting of several smaller component rectangles, and you traverse along them with another rectangle with force being applied into that structure, there are cases where the object gets caught on a false collision on an edge that faces the inside of the shape. I have spent a lot of time thinking about how I could possibly solve this without having to resort to a grid-based system, and I realized that physics engines do this properly. What I want to know is how they do this. What do physics engines do beyond basic SAT that allows this kind of proper collision resolution in complex environments? I've been looking through the source code to Box2D trying to find out how they do it but it's not quite as easy as looking at a Collision() method. I think I'm not good enough at physics to know what they're doing mathematically and not good enough at programming to know what they're doing programmatically. This is what I aim to fix.

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  • ubuntu live cd start up error

    - by Emiel
    First off, I'm new to the Linux scene. This is my first attempt to make a single boot installation for Ubuntu. I tried it for a few days in dual boot with win7 and I was sold, so i removed the tumor my pc had to endure for so long (sorry laptop) and installed Ubuntu from an usb boot device. My dual boot was as follows: Windows 7 was installed on partition C from hdd1, the windows installer for Ubuntu installed Ubuntu on partition I on that same hdd, hdd1. In the live cd installation I did the normal execution for removing windows and it said that after the installation my partition would be 320gb big, that is the total size of my hdd, so I automatically assumed that it would format my whole hdd. Now the installation has completed and it tells me to restart my system, and here comes the problem: now I get a dashing white cursor on my screen after the BIOS load and it won't budge... it just stands there and it doesn't move on or load Ubuntu, the system gets very hot at this point... Then I tried to reinstall using the same live CD, it is still on my USB drive, but when I boot from the USB, I get the error: no such file with some address and the a grub rescue. What to do? I can get hold of a win7 copy, but I don't really want to use that crap again... Thanks for helping me out. Kind regards, Emiel

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  • lxterminal not working

    - by Dora
    My Lxterminal is not working. Here's some background: A few days ago I wanted to configure the keyboard layouts for my Lubuntu 11.10 for English and Romanian. You can find a deetailed description of what I did here: http://ubuntuforums.org/showthread.php?p=11793260 So, it worked for a few days. Today it stopped working again. So I started reading forums again. I tried to follow this forum: Switching keyboard layouts in Lubuntu 11.10 so I went up in the terminal, went into the .bashrc file and added this sudo tee -a /etc/xdg/lxsession/Lubuntu/autostart right after this: setxkbmap -layout "us,ro(winkeys)" -option "grp:ctrl_shift_toggle" Then pressed Ctrl+X and Enter. Almost at the same time I installed some system updates. A few minutes later I wanted to use the terminal again, and this is what happens: [sudo] password for dora: I type in the password but nothing happens. Also, whatever other command I try to type, it just gets returned. No errors messages, nothing. Please help. PS: Funnily, I just noticed that I am now able to type in Romanian again!

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