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• Lua and multi-paradigm programming: scope and capabilities

  - by Ef Es

  Despite having started learning programming with Pascal and C, after the jump to OO (C++, Java) I lost sense of the structured programming paradigm. I have started learning Lua and I have researched many tutorials, but all of them only cover basic operations and language features and capabilities. They feel more like a reference doc than a programmer's guide. Now, when trying to work with day to day tasks, how does one go through most common design patterns like observer, or multithreaded programming, creating UI elements and polling system calls for keyboard or sensors? Is it even feasible in this languages or you have to work with the C binding, libraries and low-level programming to get most stuff done? Do I get the Lua scope wrong?

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• Bridge made out of blocks at an angle

  - by Pozzuh

  I'm having a bit of trouble with the math behind my project. I want the player to be able to select 2 points (vectors). With these 2 points a floor should be created. When these points are parallel to the x-axis it's easy, just calculate the amount of blocks needed by a simple division, loop through that amount (in x and y) and keep increasing the coordinate by the size of that block. The trouble starts when the 2 vectors aren't parallel to an axis, for example at an angle of 45 degrees. How do I handle the math behind this? If I wasn't completely clear, I made this awesome drawing in paint to demonstrate what I want to achieve. The 2 red dots would be the player selected locations. (The blocks indeed aren't square.) http://i.imgur.com/pzhFMEs.png.

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• Slow transfer to external USB3 hard drive

  - by JMP

  Trying to backup data from hard drive before reloading windows following some issue with its load. Having trouble with the file transfer to a USB3/2 external hard drive NTFS. Getting transfer speed of about 116.7kB/sec. In other words its taking about 5 hours to transfer 1.4GB. I've got about 80GB to go. So the transfer is going to take 11days. Seems a little on the slow side. Am I missing something? Is there a way to make this faster. No issue with the external drive transferring this amount in windows. But don't have that option at the moment.

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• Search engine friendly, SEO blog software

  - by Steve

  Is there a comparison of the SEO capabilities of different blogging software/blogging plugins? I'd like things to be as optimised as possible. I have a basic grasp of SEO principles, probably 12-24 months old. I'm about to start a blog, after having a few previously. Also, I'm not up to speed on what pings are in the blogging world. What are they, and how do they work? I assume it is best to have blogging software that automatically pings.

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• Computer crashed during 3.0.0.17-generic kernel upgrade

  - by Z Swim

  My computer crashed (due to heat) during the update process for the 3.0.0.17-generic kernel upgrade. My computer will not boot ant all in 3.0.0.17 now and 3.0.0.16 is unstable (wireless networking doesn't work, also crashes often). I found the boot to previous versions tool at start up and the last stable version is 3.0.0.15-generic. However, my computer still thinks that it has 3.0.0.16-generic and 3.0.0.17-generic, even though both of these versions are broken. Is there anyway to force a reinstall of the 3.0.0.16-generic and 3.0.0.17-generic kernel updates from 3.0.0.15 and associated other updates?. (Without having to do a full reinstall?) I am running ubuntu 11.10. Thanks!

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• Cocos2D: Upgrading from OpenGL 1.1 to 2.0

  - by Alex

  I have recently starting upgrading my ios game to the latest Cocos2D (2.0 rc), and I am having some difficulties upgrading my texture generation code to OpenGL 2.0. In the old version I generated images with this code: CCRenderTexture *rt = [CCRenderTexture renderTextureWithWidth:WIDTH height:HEIGHT]; [rt beginWithClear:bgColor.r g:bgColor.g b:bgColor.b a:bgColor.a]; glDisable(GL_TEXTURE_2D); glDisableClientState(GL_TEXTURE_COORD_ARRAY); glVertexPointer(2, GL_FLOAT, 0, verts); glColorPointer(4, GL_FLOAT, 0, colors); glDrawArrays(GL_TRIANGLE_STRIP, 0, (GLsizei)nVerts); glEnableClientState(GL_TEXTURE_COORD_ARRAY); glEnable(GL_TEXTURE_2D); [rt end]; But since OpenGL 2.0 works differently this code won't work. What is the best way to use the new OpenGL?

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• How i can sign and/or group a specific set of vertices in a 3D file container like OBJ ? - in Blender

  - by user827992

  I would like to export a 3D model with each part having a name or a label if you will. For example i would like to export a model of an human body and name each part in specifics vertex groups like: left hand, right hand, right foot, head, ears, ... and you got the idea; so i can have a single 3D model that i can explode in various parts if needed. If there is a better technique about how to mark vertex groups in a 3D file please share your solution. As 3D editor i use Blender.

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• How to change the default desktop environment?

  - by Kshitiz Sharma

  I wanted to try out different desktop environments so I installed XFCE, KDE, GNOME, etc on top of Unity in Ubuntu 12.04 After a while I decided that I didn't like those other DEs and would stick to Unity. So I changed my default DE to Unity by configuring gdm. > sudo dpkg-reconfigure gdm Now I am able to choose my DE at login time and all of DEs are working properly. But the strange thing is that my boot up screen says 'lubuntu', my login screen is KDE, and my desktop is Unity. How and why is this happening? Why didn't my gdm configuration have any effect? Does login and boot up screen need to be configured separately from the DE? There are other similar questions here but they are not the same as this one. I do not want to remove the other enviroments I'm quite happy with having a list of DEs to select from. I want to know how to set proper defaults.

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• copy files to Nexus 4 on Kubuntu (13.04)

  - by cerr

  I know, this has been asked a few times already but I'm still having troubles to get files copied my new Nexus 4 phone mounted on my Kubuntu 13.04 machine. I followed the guide at: http://www.pocketables.com/2013/03/how-to-mount-the-lg-nexus-4-as-a-usb-drive-in-linux.html I would only get: $ cp -r /mnt/media/Albums/A\ Perfect\ Circle\ -\ Thirteenth\ Step/ . cp: accessing ‘.’: Transport endpoint is not connected reg@regDesktopHome:/media/nexus4/Internal storage/Music$ ls -l but thereafter , mount still shows it mounted: mtpfs on /media/nexus4 type fuse.mtpfs (rw,nosuid,nodev,allow_other) What's going on here? Thanks for the assistance!

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• Detecting tile with height in isometric game

  - by Carlos Navarro

  I'm trying to create an isometric tile-based game (for iPhone) and I'm having trouble with height in tiles. What I currently do (without heights) is apply some mathematic transformations to my 2D-matrix (which represent the tiles) so that I know where in the screen (x,y) should I place the isometric tile. Then, when the user clicks somewhere in the screen, I take that values and pass them through a function (kind of f^-1) to get which tile it belongs to. This works perfectly. My problem is: imagine that I want some tiles to have a different height from others. In order to draw the tile itself its pretty simple, since the z-coordinate has no transformation in the isometric approach used in games (z'=z). BUT what if I want to calculate the tile coordinate (defined by X-tile and Y-tile) from the touch coordinates (x,y)? Any guess?

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• Windows Not Sleeping All Night

  - by John Paul Cook

  Having a computer wake up when you don’t want it to wastes electricity and drains the battery on mobile devices. My desktop had been waking up at night, so I assumed it was some network traffic on my home network. I unchecked Allow this device to wake the computer on my network adapters . Figure 1. Network adapter Power Management tab. That didn’t solve the problem. I included the screen capture in Figure 1 because it could be part of the solution for someone else. To identify the root cause instead...(read more)

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• New to iPhone Development - iOS5 Storyboard

  - by Peter

  I'm new here and pretty new to iOS development. My question is basically, should I learn the old school development methods or just learn how to do things using the latest tools (i.e. Storyboard)? I've had a go with the Storyboard feature of XCode 4.2 and it's very powerful. My only concern is that it requires iOS 5. I don't mind learning the old way of doing things but I've been having trouble finding tutorials/examples for XCode 4.2 that don't use the storyboard. An example would be the with my trouble finding a good tutorial on how to embed a Navigation Controller into a TabBarController. A lot of the material out there seems to be for older version of XCode. Using the storyboard I'm able to set this up with seconds but still haven't managed to get it working without it. So in short :) would you guys suggest I continue my project using the Storyboard or make the extra effort to do things a little more manually?

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• How do I get the point coords of a rotated SFML shaperect?

  - by user15498

  I am trying to get collisions of bullets working, and am using SFML. I am using code to get the position of the points of the rectangle for collisions, however I think there's a way to do this without having to get points but by simply getting the points from SFML, since the shape is a rectangle and the points are stored in that way. Is there a way to do that? Through a combination of getPoint() and getGlobalBounds() maybe? While on this topic, is it better to use shapeRects or sprites? I used to only use sprites, however with the addition of textures and more low level stuff I think it would be best to switch to using rectangles and setting their size.

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• Are icon fonts bad for SEO?

  - by user359650

  Instead of using <img> tags for your icons, you can use icon fonts on <span> tags (which offer some advantages such as not having to create a sprite, being able to scale icons up/down without degrading quality...). However, by using an icon font you give up the <img> alt attribute (that attribute can help you with SEO). There is a way to add text to the <span> and hide it, but I wonder whether this is recognized / penalized by Google (as it seems to go against the quality guidelines). Are icon fonts bad for SEO (i.e. by using icon fonts you give up the alt attribute) ? Would inserting text in font icon tag and hiding it with CSS (text-indent: -9999px) be recognized / penalized by Google ?

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• Animating isometric sprites

  - by Mike

  I'm having trouble coming up with a way to animate these 2D isometric sprites. The sprites are stored like this: < Game Folder Root /Assets/Sprites/< Sprite Name /< Sprite Animation /< Sprite Direction /< Frame Number .png So for example, /Assets/Sprites/Worker/Stand/North-East/01.png Sprite sheets aren't really viable for this type of animation. The example stand animation is 61 frames. 61 frames for all 8 directions alone is huge, but there's more then just a standing animation for each sprite. Creating an sf::Texture for every image and every frame seems like it will take up a lot of memory and be hard to keep track of that many images. Unloading the image and loading the next one every single frame seems like it will do a lot of unnecessary work. What's the best way to handle this?

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• Are there any advantages to using ASP.Net MVC 3 over Ruby On Rails for existing businesses? [closed]

  - by user786621

  Possible Duplicate: What ASP.NET MVC can do and Ruby on Rails can't? I've been hearing a lot of good press about Ruby On Rails but I'm having a hard time finding much information on the advantages of using ASP.Net MVC 3 over RoR, yet I see many existing businesses migrating over to ASP.Net MVC. Does ASP.Net MVC 3 have any advantages over Ruby On Rails for existing businesses such as possibly tying into old databases better or allowing for more complex business logic? Or is it most likely the case that they are transferring simply because they were already using ASP.Net for Winforms?

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• Which 3D file formats support multiple animations? [on hold]

  - by Justin

  I'm working on a 3D application that uses Assimp to import 3D models with animations. Personally, I use Blender to create the models and animations. I'm having trouble exporting multiple animations, however. For example, I'd like to have an idle animation, a walk animation, a run animation, etc. So far I've tried COLLADA and DirectX without much success. The COLLADA export will include the first animation, but not any of the others. The DirectX doesn't include any animation. Which 3D file formats support multiple animations? (Preferably one that Assimp can import. Also, the Assimp website says that it doesn't support .blend files with animation, otherwise I'd just do that.)

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• Kubuntu 12.04: Change login screen background?

  - by drezabek

  I am having trouble changing my login screen background. I can select the default wall paper, the Kde-default one, but when ever I select my own custom wallpaper, there is no image, just a solid color. Normally, I would just ignore it, but the thing that bugs me is that this is a fresh install of Kubuntu 12.04 64bit, and the OS before this one, the one I overwrote, I had no trouble using the exact same image as the background... Settings In the System Settings application, Login Screen settings, Background tab, enable background, Under "Background", selected Picture, under options, selected Position: Scaled. Colors: Single Color. Blending: No Blending.

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• Why is Backbone.js a bad option in the Technology radar 2012 of thoughtworks?

  - by Cfontes

  In the latest Technology Radar 2012 they state that Backbone.js has pushed to far on it's MVC abstraction and say that Knockout.js or Angular.js should be used instead. I cannot get why they think that Backbone.js model is bad, for me it's just a way to create a standard so people can have some kind of roadmap to dev frontend JS without Spaghetti code. Also for me Angular and Knockout solve a different problem, I like both of them but having to code all MVC classes is something I think is kind of a rework. The thing is simple easy extendable and fast to learn, comes with a lot of goodies and is easy to combine with other Frameworks. (see Knockback.js) Can anybody tell me what made it so bad to their eyes ?

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• How do I render terrain in a 2.5D perspective, like in the game Don't Starve?

  - by Hamdan

  I have experience in making 2D side scroller games such as Terraria, but now I want to challenge myself and make a game that has a 2.5D perspective. The game I am trying to mimic is Don't Starve. Right now my focus is on figuring out how to render the ground. I am having a hard time figuring out how they generated the ground, and then rendered it. The way I think they rendered the ground is by first painting the ground in some paint program, and then somehow manipulating that flat image so that it appears to have depth. I am completely confused by how you would actually render that type of terrain. I want the terrain to have the following features: Look like the terrain in Don't Starve, here is a video showing the terrain in Don't Starve The terrain will be flat, and the camera's angle and perspective will be fixed Any tips and hints will be appreciated, Thank you in advance. (I am working in Java, using the Light Weight Java Game Library (LWJGL).)

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• Trouble installing downloaded program

  - by Hamlette

  I purchased and downloaded Celtx and I'm having trouble installing it (in Ubuntu 13.04). I'm a Linux newbie (literally had it for four days) so please be kind and don't assume much experience with the command line, I'm still learning. The folder with all related files/packages etc. is under "Downloads" and I have tried several commands to try and install but I'm just not doing it right and would appreciate help with exactly what command(s) to use. Sudo apt-get install celtx did not work. I'm assuming I'm missing a step somewhere.

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• How can I rescue a Lubuntu install?

  - by Ghost

  Quick recap: I was having a problem with hibernation so I check and the linuxswap partition is missing, showing an "unknown" chunk of drive where it was. Happened before, booted to the liveCD and used Gparted to reformat that partition back to swap. Then I boot........F---- grub rescue... MBR took care of the problem, except that now I'm back to Windows only. EVERY guide out there makes me reinstall Lubuntu from scratch, a waste of time considering it will take me at least a day to reinstall everything there. Can't I just fix grub like I did with the win MBR?

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• Network Manager troubleshooting

  - by Anero

  I'm having some issues when connecting to my house's wifi from my Ubuntu 10.10 laptop. If the connection doesn't exists, when selecting the network (and after entering the WPA2 password) I'm able to connect. Once the connection is saved, when trying to reconnect, Network Manager works for a minute or so and then fails; the only way to reconnect then is to delete the saved connection and re-select the network from the list of available wireless networks. The same network works with no issues on the same laptop when running Win7, and on other wireless networks when running Ubuntu. Is there a Network Manager log which I can take a look at for troubleshooting the issue? Are there any tools for checking the wifi status?

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• Sortable Accordion Modified to Implement More On Click However New Levels Will Not Expand

  - by Tim Marshall

  JS Fiddle: http://jsfiddle.net/JF7PD/ I've been doing extensive work on this and I've just able almost got it fully working. The reason why I am asking for help now is that I don't have a clue why my newly added accordion(s) do not expand upon being clicked. I've got a feeling it may be due to the newly added code as I was having problems using my code in the file so instead I looked at the source and copied the accordion level to be used and all appears to look fine apart from them not expanding. Thank you for any help in advanced, Best Regards, Tim

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• Tunnels in pseudo 3D racing game

  - by Nicholas

  How would one go about doing tunnels in a pseudo 3D racing game ? The main problem I have at the moment is perspective - I cant think of a way, beyond having to Z sort the sprites and tunnel coordinates, so that vehicles are displayed in front of the tunnel entrance and somehow block the display when out of site. I would like my tunnels to be used on both flat, curved and hills and slopes. The tunnel enterance/exit is made up of 3 separate graphics, (left, right and top), whilst inside the tunnel it is just one line graphic along the top (the idea being its supposed to be a set distance above the current vertical road position). As you can see from the picture, the vehicles are still being rendered whilst in the tunnel. I've converted the Code Incomplete road system to GLBasic.

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