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• Installation stuck on "Installation Type" screen

  - by Andrew Latham

  I am trying to install Ubuntu 11.10 with Windows 7 from a CD. I am using an HP Pavilion dm4. I've never used Ubuntu (or any Linux) before. Everything goes alright until I get to the "Installation Type" screen. Instead of giving me options, it just has a blank menu, and all the buttons are disabled. When I click "Continue", it gives me an error saying that it can't find the root or something like that. The trial version works fine, but I can't actually install it. Everything on the trial version is really slow, presumably because everything is on the CD or the Windows partition. I did some research, but the only post I could find was http://ubuntuforums.org/showthread.php?t=1870478 Where the only advice is to format the entire drive, which I'm not willing to do. Any suggestions? I'm downloading 10.04 right now and I'm going to try with that instead. EDIT: 10.04 didn't work either. I got to the partitioning screen and got the same problem. I read some more forums, loaded up 11.10 trial from the disk, opened the Terminal and typed sudo apt-get remove dmraid and then y. Then I was actually able to see something on the "Installation type" page: "Erase disk and install Ubuntu" or "Something else". Which is weird, since Windows 7 should be installed. When I click Something Else, I get: /dev/sda /dev/sdb /dev/sdb1 (ntfs) (208 MB) (69 MB used) /dev/sdb2 (ntfs) (477542 MB) (unknown used) /dev/sdb3 (ntfs) (18085 MB) (16094 MB used) /dev/sdb4 (fat32) (4265 MB) (3084 MB used) I have no idea what any of this means. Also, my device for boot loader installation changed from /dev/sda to /dev/sda ATA SAMSUNG MZMPA032 (32.0 GB)

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• How to map network scanner

  - by Andrew Heath

  I have just bought a shiny new Canon MG6250 multifunction printer/scanner and connected it via LAN. Installing the printing side of things was a breeze, however, I cannot work out how to set up scanning. I installed the MG6200 series ScanGear MP driver from Canon's site but when I open GIMP or Simple Scan, they say there is no scanner detected. Using GIMP's 'update scanner list' button to search for the scanner does not find it. How do I tell Ubuntu, GIMP or Simple Scan to look on the network for the scanner? Is there another utility especially for this?

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• Practical Performance Monitoring and Tuning Event

  - by Andrew Kelly

    For any of you who may be interested or know of someone in the market for a performance Monitoring and Tuning class I have just the ticket for you. It’s a 3 day event that will be held in Atlanta Ga. on January 25th to the 27th 2011. For those of you that know me or have been to my sessions you realize I like to provide more than just classroom theory and like to teach real world and above all practical methodology when it comes to performance in SQL Server. This class covers all the essentials...(read more)

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• Implementing a wrapping wire (like the Worms Ninja Rope) in a 2D physics engine

  - by Andrew Russell

  I've been trying out some rope-physics recently, and I've found that the "standard" solution - making a rope from a series of objects strung together with springs or joints - is unsatisfying. Especially when rope swinging is relevant to gameplay. I don't really care about a rope's ability to wrap up or sag (this can be faked for visuals anyway). For gameplay, what is important is the ability for the rope to wrap around the environment and then subsequently unwrap. It doesn't even have to behave like rope - a "wire" made up of straight line segments would do. Here's an illustration: This is very similar to the "Ninja Rope" from the game Worms. Because I'm using a 2D physics engine - my environment is made up of 2D convex polygons. (Specifically I am using SAT in Farseer.) So my question is this: How would you implement the "wrapping" effect? It seems pretty obvious that the wire will be made up of a series of line segments that "split" and "join". And the final (active) segment of that line, where the moving object attaches, will be a fixed-length joint. But what is the maths / algorithm involved for determining when and where the active line segment needs to be split? And when it needs to be joined with the previous segment? (Previously this question also asked about doing this for a dynamic environment - I've decided to split that off into other questions.)

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• index.html redirecting to cgi-sys/defaultwebpage.cgi

  - by Andrew De Forest

  This problem has been persisting over the last couple of days. I thought I fixed it Friday only to get in on Monday morning and see that cPanel is still giving me issues. On Friday, all incoming traffic to my index.html page were being redirected to cgi-sys/defaultwebpage.cgi. Upon further investigation, I found that my entire index.html code had been overwritten and contained only a single meta tag, which was causing the aforementioned redirect. I re-uploaded the original index page and overwrote the one that was causing the redirects and it seemed to have fixed the problem. Fast forward to Monday. The problem began happening again and I took the same steps as before to fix it, but now I'm wondering how to permanently stop this from happening. From what I've found, it's related to cPanel. I personally did not make any changes to the server, but there are a few people with access who might have. I'm on a VPS with my own dedicated IP address. I've been hosting fine for a few months without this problem. The server is runs a traditional LAMP stack.

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• Refactoring in domain driven design

  - by Andrew Whitaker

  I've just started working on a project and we're using domain-driven design (as defined by Eric Evans in Domain-Driven Design: Tackling Complexity in the Heart of Software. I believe that our project is certainly a candidate for this design pattern as Evans describes it in his book. I'm struggling with the idea of constantly refactoring. I know refactoring is a necessity in any project and will happen inevitably as the software changes. However, in my experience, refactoring occurs when the needs of the development team change, not as understanding of the domain changes ("refactoring to greater insight" as Evans calls it). I'm most concerned with breakthroughs in understanding of the domain model. I understand making small changes, but what if a large change in the model is necessary? What's an effective way of convincing yourself (and others) you should refactor after you obtain a clearer domain model? After all, refactoring to improve code organization or performance could be completely separate from how expressive in terms of the ubiquitous language code is. Sometimes it just seems like there's not enough time to refactor. Luckily, SCRUM lends it self to refactoring. The iterative nature of SCRUM makes it easy to build a small piece and change and it. But over time that piece will get larger and what if you have a breakthrough after that piece is so large that it will be too difficult to change? Has anyone worked on a project employing domain-driven design? If so, it would be great to get some insight on this one. I'd especially like to hear some success stories, since DDD seems very difficult to get right. Thanks!

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• How to create art assets for a 3d avatar editor

  - by Andrew Garrison

  I am currently prototyping an idea for an iPhone game. I'd like to create an avatar editor inside the game so that the player can create a 3d avatar face and modify certain features (using slider controls), such as nose shape, eye color, mouth size, etc. This has been done in several games, but what I'm looking to do would be fairly cartoon-ish/caricature-ish, similar to the Mii editor on the Nintendo Wii (http://www.myavatareditor.com/). I'd also like the final result to have the ability to use some canned animations, such as simple speech animations, smiling, frowning, etc. I am not an artist, so I would be unable to create these assets, but what kind of effort is required for an artist to create the 3d models necessary for this type of game? Also what mechanism would be required to tweak the face's characteristics? Would you use bones or morph targets? How would the final result be animated? Would facial animation use bones or morph targets? I've seen several tools that do this sort of thing too, such as FacialStudio. Are there any facial generation tools out there you'd recommend for generating some base content for this game, or should I just hire an artist to do this type of work. Thanks!

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• How to Fix "Read-only file system" error when I run something as sudo and try to make a folder/file?

  - by Andrew

  When I try to save something or rename a file/folder it say this error " Read-only file system" or run something as root in the terminal it say this error sudo: unable to open /var/lib/sudo/"My User Name"/0: Read-only file system W: Not using locking for read only lock file /var/lib/dpkg/lock E: Unable to write to /var/cache/apt/ E: The package lists or status file could not be parsed or opened. When I make a Folder the error dialog in the details with Nautilus is this: Error creating directory: Read-only file system I would show you I picture of it but it isn't even letting my save onto my flash drive. Please help me.

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• First steps into css - aligning data insite one DIV [on hold]

  - by Andrew

  I am trying to move away from tables, and start doing CSS. Here is my HTML code that I currently trying to place into a nice looking container. <div> <div> <h2>ID: 4000 | SSN#: 4545</h2> </div> <div> <img src="./images/tenant/unknown.png"> </div> <div> <h3>Names Used</h3> Will Smith<br> Bill Smmith<br> John Smith<br> Will Smith<br> Bill Smmith<br> John Smith<br> Will Smith<br> Bill Smmith<br> John Smith<br> </div> <div> <h3>Phones Used</h3> 123456789<br> 123456789<br> 123456789<br> 123456789<br> 123456789<br> 123456789<br> 123456789<br> 123456789<br> </div> <div> <h3>Addresses Used</h3> 125 Main Evanston IL 60202<br> 465 Greenwood St. Schaumburg null 60108<br> 125 Main Evanston IL 60202<br> 465 Greenwood St. Schaumburg null 60108<br> 125 Main Evanston IL 60202<br> 465 Greenwood St. Schaumburg null 60108<br> 125 Main Evanston IL 60202<br> 465 Greenwood St. Schaumburg null 60108<br> 125 Main Evanston IL 60202<br> 465 Greenwood St. Schaumburg null 60108<br> </div> </div> I now understand now I create classes and assign classes to elements. I have no issues doing colors. But I am very confused with elements alignments. Could you suggest a nice way to pack it together with some CSS which I can analyze and take as a CSS starting learning point?

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• What is the best aproach for coding in a slow compilation environment

  - by Andrew

  I used to coding in C# in a TDD style - write/or change a small chunk of code, re-compile in 10 seconds the whole solution, re-run the tests and again. Easy... That development methodology worked very well for me for a few years, until a last year when I had to go back to C++ coding and it really feels that my productivity has dramatically decreased since. The C++ as a language is not a problem - I had quite a lot fo C++ dev experience... but in the past. My productivity is still OK for a small projects, but it gets worse when with the increase of the project size and once compilation time hits 10+ minutes it gets really bad. And if I find the error I have to start compilation again, etc. That is just purely frustrating. Thus I concluded that in a small chunks (as before) is not acceptable - any recommendations how can I get myself into the old gone habit of coding for an hour or so, when reviewing the code manually (without relying on a fast C# compiler), and only recompiling/re-running unit tests once in a couple of hours. With a C# and TDD it was very easy to write a code in a evolutionary way - after a dozen of iterations whatever crap I started with was ending up in a good code, but it just does not work for me anymore (in a slow compilation environment). Would really appreciate your inputs and recos. p.s. not sure how to tag the question - anyone is welcome to re-tag the question appropriately. Cheers.

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• How can I automatically change the system keyboard layout when plugging in an external keyboard?

  - by Andrew Bolster

  I have a US-Style laptop, which is fine, but I also have a UK-style Ergonomic USB keyboard. As such I usually have the US key layout set, but when I settle in at my desk and use the UK USB keyboard I find myself making stupid mistakes on symbols (normally a pretty good touch typist on either ergo or standard kbd). Can anyone think of a clean way of setting the keyboard layout based on the inferred layout/USBID of any plugged in Keyboard? Even having a custom setting such as adding a specific USB ID to a runtime script that checks if its plugged in or not. Can this be done without the user having to logout/in? I remember doing something similar with xorg.conf, but that required logout.

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• Do professional software developers still dream of creating industry/world-changing apps?

  - by Andrew Heath

  I'm a hobby programmer. The absence of real world deadlines, customer feedback, or performance reviews leaves me free to daydream about having and implementing The Next Great Idea That Changes the World. Of course I'm aware I probably have a better chance of winning the lottery, but it's fun to imagine knocking out some fully-homebrewed app that destroys the status quo. I know many professional programmers have side projects, some for profit others not. I was wondering on the way to work this morning (non-IT boring work) if having to code for your food tended to dampen the dreaming? Does greater experience leave you jaded and more focused on the projects at hand? Not trying to be a downer, just interested in the mindset of the real software professional :-)

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• Coding in large chunks ... Code verification skills

  - by Andrew

  As a follow up to my prev question: What is the best aproach for coding in a slow compilation environment To recap: I am stuck with a large software system with which a TDD ideology of "test often" does not work. And to make it even worse the features like pre-compiled headers/multi-threaded compilation/incremental linking, etc is not available to me - hence I think that the best way out would be to add the extensive logging into the system and to start "coding in large chunks", which I understand as code for a two-three hours first (as opposed to 15-20 mins in TDD) - thoroughly eyeball the code for a 15 minutes and only after all that do the compilation and run the tests. As I have been doing TDD for a quite a while, my code eyeballing / code verification skills got rusty (you don't really need this that much if you can quickly verify what you've done in 5 seconds by running a test or two) - so I am after a recommendations on how to learn these source code verification/error spotting skills again. I know I was able to do that easily some 5-10 years ago when I din't have much support from the compiler/unit testing tools I had until recently, thus there should be a way to get back to the basics.

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• Subversion 1.7 on 12.04 precise: libsasl error, compiling from source?

  - by Andrew Mao

  Background: I am a longtime Gentoo user, and this is my first time using Ubuntu (installed on a VM to avoid compiling everything from scratch). I am familiar with a Linux environment but somewhat unfamiliar with Ubuntu. I am trying to install Subversion 1.7 on Ubuntu and saw this post: Where can I find a Subversion 1.7 binary? The above post recommends using the PPA ppa:dominik-stadler/subversion-1.7. I also found the PPA ppa:svn/ppa from another link. They both cause problems for me. The issue is that any svn operation using the remote server causes the following error: svn: E170001: Unable to connect to a repository at URL 'svn+ssh://my_repo' svn: E170001: Could not create SASL context: generic failure: No such file or directory This seems to arise from a recent bug involving SVN dependency on the libsasl library, as documented by Debian users here: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683555 and also Mac users here: https://trac.macports.org/ticket/34861 Resolution seems to involve either updating the cyrus-sasl or libsasl library to a newer version (neither of which is in the latest apt packages), or compiling subversion without SASL support. As a Gentoo user I started looking into how to compile svn from source, but it looks way more complicated on Ubuntu than I'm used to and I'm not sure what the canonical way is. My questions: Is there an obvious fix for this problem that I am overlooking? Is there a way to update the dependencies for SVN to something that works through using synaptic or apt-get? If I want to compile from scratch, how do I use the sources in the PPA instead of downloading my own source copy (i.e. the PPA has both binary and sources?)

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• Examples of continuous integration workflow using git

  - by Andrew Barinov

  Can anyone provide a rough outline of their git workflow that complies with continuous integration. E.g. How do you branch? Do you fast forward commits to the master branch? I am primarily working with Rails as well as client and server side Javascript. If anyone can recommend a solid CI technology that's compatible with those, that'd be great. I've looked into Jenkins but would like to check out other good alternatives. To put some context into this, I am planning on transitioning from working as a single developer into working as part of the team. I'd like to start standardizing my own personal workflow so that I can onboard new devs quickly.

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• Ubuntu 10.10 Netbook Remix on Asus Eee PC 701 4G - boot process hangs up

  - by Andrew

  I've got an old Eee PC 701 4G with the following specifications: 512 MB RAM 4GB SSD drive SM223AC 8GB SD card extension Screen resolution: 800 x 480 BIOS Revision 1101 (05/16/2008) EC Firmware version: EPC-079 Windows XP SP3 works fine on it, but I decided to switch my OS to Ubuntu. I have downloaded an Ubuntu 10.10 Netbook Remix ISO and wrote it to my FAT32 SD card using Universal-USB-Installer-1.8.3.3, as described on ubuntu.com During standard load from the SD card the boot process hangs up with black screen. If I'll press F6 while preloading Ubuntu, it sucessfully displays the boot menu, selecting language and showing 2 main commands: "Run ubuntu from USB drive" and "Insall Ubuntu". Selecting either of these commands leading to the same result - after some background work the main loading indicator is displayed ("Ubuntu" text with dotted progress bar under it), and it's progressing forever without any effect. Is Ubuntu 10.10 compatible with my Eee PC at all? How to boot it correctly?

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• Why Does Ejabberd Start Fail?

  - by Andrew

  I am trying to install ejabberd 2.1.10-2 on my Ubuntu 12.04.1 server. This is a fresh install, and ejabberd is never successfully installed. The Install Every time, apt-get hangs on this: Setting up ejabberd (2.1.10-2ubuntu1) ... Generating SSL certificate /etc/ejabberd/ejabberd.pem... Creating config file /etc/ejabberd/ejabberd.cfg with new version Starting jabber server: ejabberd............................................................ failed. The dots just go forever until it times out or I 'killall' beam, beam.smp, epmd, and ejabberd processes. I've turned off all firewall restrictions. Here's the output of epmd -names while the install is hung: epmd: up and running on port 4369 with data: name ejabberdctl at port 42108 name ejabberd at port 39621 And after it fails: epmd: up and running on port 4369 with data: name ejabberd at port 39621 At the same time (during and after), the output of both netstat -atnp | grep 5222 and netstat -atnp | grep 5280 is empty. The Crash File A crash dump file is create at /var/log/ejabber/erl_crash.dump. The slogan (i.e. reason for the crash) is: Slogan: Kernel pid terminated (application_controller) ({application_start_failure,kernel,{shutdown,{kernel,start,[normal,[]]}}}) It's alive? Whenever I try to relaunch ejabberd with service ejabberd start, the same thing happens - even if I've killed all processes before doing so. However, when I killall the processes listed above again, and run su - ejabberd -c /usr/sbin/ejabberd, this is the output I get: Erlang R14B04 (erts-5.8.5) [source] [64-bit] [rq:1] [async-threads:0] [kernel-poll:false] Eshell V5.8.5 (abort with ^G) (ejabberd@ns1)1> =INFO REPORT==== 15-Oct-2012::12:26:13 === I(<0.478.0>:ejabberd_listener:166) : Reusing listening port for 5222 =INFO REPORT==== 15-Oct-2012::12:26:13 === I(<0.479.0>:ejabberd_listener:166) : Reusing listening port for 5269 =INFO REPORT==== 15-Oct-2012::12:26:13 === I(<0.480.0>:ejabberd_listener:166) : Reusing listening port for 5280 =INFO REPORT==== 15-Oct-2012::12:26:13 === I(<0.40.0>:ejabberd_app:72) : ejabberd 2.1.10 is started in the node ejabberd@ns1 Then, the server appears to be running. I get a login prompt when I access http://mydomain.com:5280/admin/. Of course I can't login unless I create an account. At this time, the output of netstat -atnp | grep 5222 and netstat -atnp | grep 5280 is as follows: tcp 0 0 0.0.0.0:5222 0.0.0.0:* LISTEN 19347/beam tcp 0 0 0.0.0.0:5280 0.0.0.0:* LISTEN 19347/beam ejabberdctl Even when it appears ejabberd is running, trying to do anything with ejabberdctl fails. For example: trying to register a user: root@ns1:~# ejabberdctl register myusername mydomain.com mypassword Failed RPC connection to the node ejabberd@ns1: nodedown I have no idea what I'm doing wrong. This happens on two different servers I have with identical software installed (really not much of anything). Please help. Thanks.

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• help animating player in corona sdk

  - by andrew McCutchan

  working on a game in the corona sdk with lua and I need help so the player animates on the line drawn. Right now he animates at the beggining and the end but not on the line. here is the player code function spawnPlayerObject(xPlayerSpawn,yPlayerSpawn,richTurn) --spawns Rich where we need him. -- riches sprite sheet and all his inital spirites. We need to adjust this so that animations 3-6 are the only ones that animate when moving horizontally local richPlayer = sprite.newSpriteSet(richSheet1,1,6) sprite.add(richPlayer, "rich", 1,6,500,1) rich = sprite.newSprite(richPlayer) rich.x = xPlayerSpawn rich.y = yPlayerSpawn rich:scale(_W*0.0009, _W*0.0009) -- scale is used to adjust the size of the object. richDir = richTurn rich.rotation = richDir rich:prepare("rich") rich:play() physics.addBody( rich, "static", { friction=1, radius = 15 } ) -- needs a better physics body for collision detection. end and here is the code for the line function movePlayerOnLine(event) --for the original image replace all rich with player. if posCount ~= linePart then richDir = math.atan2(ractgangle_hit[posCount].y-rich.y,ractgangle_hit[posCount].x-rich.x)*180/math.pi playerSpeed = 5 rich.x = rich.x + math.cos(richDir*math.pi/180)*playerSpeed rich.y = rich.y + math.sin(richDir*math.pi/180)*playerSpeed if rich.x < ractgangle_hit[posCount].x+playerSpeed*10 and rich.x > ractgangle_hit[posCount].x-playerSpeed*10 then if rich.y < ractgangle_hit[posCount].y+playerSpeed*10 and rich.y > ractgangle_hit[posCount].y-playerSpeed*10 then posCount = posCount + 1 end end I don't think anything has changed recently but I have been getting an error when testing of " attempt to upvalue "rich" a nil value" on the second line, richDir = etc.

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• Speaking in Raleigh NC June 15th

  - by Andrew Kelly

  Just a heads up to those in the area that I will be speaking at the (TriPASS) Raleigh SQL Server user group on the 15th of June 2010. The topic is Storage & I/O Best Practices. The abstract is listed below: SQL Server relies heavily on a well configured storage sub-system to perform at its peak but unfortunately this is one of the most neglected or mis-configured areas of a SQL Server instance. Here we will focus on the best practices related to how SQL Server works with the underlying storage...(read more)

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• Setting up Google Analytics for multiple subdomains

  - by Andrew G. Johnson

  so first here's a snippet of my current Analytics javascript: var _gaq = _gaq || []; _gaq.push(['_setAccount', 'UA-30490730-1']); _gaq.push(['_setDomainName', '.apartmentjunkie.com']); _gaq.push(['_setSiteSpeedSampleRate', 100]); _gaq.push(['_trackPageview']); (function() { var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true; ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js'; var s = document.getElementsByTagName('script')[0];s.parentNode.insertBefore(ga, s); })(); So if you wanna have a quick peak at the site the url is ApartmentJunkie.com, keep in mind the site is pretty bare bones but you'll get the idea -- basically it's very similar to craigslist in the sense that it's in the local space so people pick a city then get sent to a subdomain that is specific for that city, e.g. winnipeg.mb.apartmentjunkie.com. I put that up late last night then had a look at the analytics and found that I am seeing only the request uri portion of the URLs in analytics as I would with any other site only with this one it's a problem as winnipeg.mb.apartmentjunkie.com/map/ and brandon.mb.apartmentjunkie.com/map/ are two different pages and shouldn't be lumped together as /map/ I know the kneejerk response is likely going to be "hey just setup a different google analytics profile for each subdomain" but there will eventually be a lot of subdomains so google's cap of 50 is going to be too limited and even more important I want to see the data in aggregate for the most part. I am thinking of making a change to the javascript, to something like: _gaq.push(['_trackPageview',String(document.domain) + String(document.location)]); But am unsure if this is the best way and figured someone else on wm.se would have had a similar situation that they could talk a bit about.

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• Latest SolidQ Journal Plus Giveaways

  - by Andrew Kelly

    You can find the latest edition of the SolidQ Journal here that is always good reading but if you register over the next 3 weeks you may be eligible for a prize including:  One $500 Amazon gift card and 5 $150 gift cards; books from Itzik Ben-Gan, Greg Low, and Erik Veerman/Jay Hackney/Dejan Sarka; and chats with MarkTab and Kevin Boles.   The deadline for the giveaway is January 7th and you can register for it HERE .  So be a good little boy or girl and maybe Santa will bring...(read more)

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• Closer Aero-snap in ubuntu

  - by Andrew Redd

  Before I get screamed at for duplicating a question. Ive read windows 7-like snap window maximize and vertical feature and http://www.omgubuntu.co.uk/2009/11/get-aero-snap-in-ubuntu/ There are two problems with this solution that I am trying to get around. It's not sensitive to dragging a window It's not intelligent for Twin-view monitors. The first problem is the more pressing. I have the compiz settings with wmctrl, but this is not sensitive to dragging windows if I have a window with the focus and place my mouse in the panel I get the window maximized, even though I'm not dragging the window. A good solution would be sensitive to the state of the mouse, clicked, right clicked, middle clicked. An ideal solution would be sensitive to dragging a window or not. Second is a minor annoyance to me at least. With the commands as they are listed are equivalent to maximizing the windows since I have a Twinview monitors setup. Is there any way to add these sensitivities to the commands?

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• help animating a player in Corona SDK

  - by andrew McCutchan

  Working on a game in the Corona SDK with Lua and I need help so the player animates on the line drawn. Right now he animates at the beggining and the end but not on the line. Here is the player code: function spawnPlayerObject(xPlayerSpawn,yPlayerSpawn,richTurn) --spawns Rich where we need him. -- riches sprite sheet and all his inital spirites. We need to adjust this so that animations 3-6 are the only ones that animate when moving horizontally local richPlayer = sprite.newSpriteSet(richSheet1,1,6) sprite.add(richPlayer, "rich", 1,6,500,1) rich = sprite.newSprite(richPlayer) rich.x = xPlayerSpawn rich.y = yPlayerSpawn rich:scale(_W*0.0009, _W*0.0009) -- scale is used to adjust the size of the object. richDir = richTurn rich.rotation = richDir rich:prepare("rich") rich:play() physics.addBody( rich, "static", { friction=1, radius = 15 } ) -- needs a better physics body for collision detection. end And here is the code for the line: function movePlayerOnLine(event) --for the original image replace all rich with player. if posCount ~= linePart then richDir = math.atan2(ractgangle_hit[posCount].y-rich.y,ractgangle_hit[posCount].x-rich.x)*180/math.pi playerSpeed = 5 rich.x = rich.x + math.cos(richDir*math.pi/180)*playerSpeed rich.y = rich.y + math.sin(richDir*math.pi/180)*playerSpeed if rich.x < ractgangle_hit[posCount].x+playerSpeed*10 and rich.x > ractgangle_hit[posCount].x-playerSpeed*10 then if rich.y < ractgangle_hit[posCount].y+playerSpeed*10 and rich.y > ractgangle_hit[posCount].y-playerSpeed*10 then posCount = posCount + 1 end end I don't think anything has changed recently but I have been getting an error when testing of "attempt to upvalue "rich" a nil value" on the second line, richDir = etc.

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• wubi dual-boot installation of ubuntu 12.04 on Windows 7 fails to boot

  - by Andrew

  I am trying to use the wubi installation process to create a Ubuntu 12.04 / Windows 7 dual boot setup on my Windows 7 machine (Dell Inspiron 17R). The installation initially works fine, and I am able to load Ubuntu several times after selecting it from the boot menu. However, when I boot into Windows 7 it seems to corrupt the Ubuntu boot process, because after running Windows 7, Ubuntu won't boot on the machine. It is still listed as an option in the boot menu, but when it is selected, the machine does one of the following: -hangs at the load-screen and says that Ubuntu is preparing to run for the first time (although it isn't the first time the OS has been loaded) -hangs with a black screen and does nothing I have uninstalled Ubuntu and then reinstalled it (using wubi) three times. Each time Ubuntu initially boots okay (including rebooting the laptop into Ubuntu several times.) However, whenever I switch over and boot into Windows 7 it breaks the Ubuntu installation. Windows 7 continues to boot and work fine without issues. I have successfully installed Ubuntu using wubi onto a different Windows 7 machine before without problems...it seems that there is something different about this laptop configuration. I am not sure how to debug the issue. I see no error messages during the Ubuntu boot process when it hangs and am not sure how to debug this.

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• Why does Farseer 2.x store temporaries as members and not on the stack? (.NET)

  - by Andrew Russell

  UPDATE: This question refers to Farseer 2.x. The newer 3.x doesn't seem to do this. I'm using Farseer Physics Engine quite extensively at the moment, and I've noticed that it seems to store a lot of temporary value types as members of the class, and not on the stack as one might expect. Here is an example from the Body class: private Vector2 _worldPositionTemp = Vector2.Zero; private Matrix _bodyMatrixTemp = Matrix.Identity; private Matrix _rotationMatrixTemp = Matrix.Identity; private Matrix _translationMatrixTemp = Matrix.Identity; public void GetBodyMatrix(out Matrix bodyMatrix) { Matrix.CreateTranslation(position.X, position.Y, 0, out _translationMatrixTemp); Matrix.CreateRotationZ(rotation, out _rotationMatrixTemp); Matrix.Multiply(ref _rotationMatrixTemp, ref _translationMatrixTemp, out bodyMatrix); } public Vector2 GetWorldPosition(Vector2 localPosition) { GetBodyMatrix(out _bodyMatrixTemp); Vector2.Transform(ref localPosition, ref _bodyMatrixTemp, out _worldPositionTemp); return _worldPositionTemp; } It looks like its a by-hand performance optimisation. But I don't see how this could possibly help performance? (If anything I think it would hurt by making objects much larger).

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