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  • LuaJit FFI and hiding C implementation details

    - by wirrbel
    I would like to extend an application using LuaJit FFI. Having seen http://luajit.org/ext_ffi_tutorial.html this is surprisingly easy when comparing this to the Lua C API. So far so good. However I do not plainly want to wrap C functions but provide a higher level API to users writing scripts for the application. Especially I do not want users to be able to access "primitives", i.e. the ffi.* namespace. Is this possible or will that ffi namespace be available to user's Lua scripts? On the issue of Sandboxing Lua I found http://lua-users.org/wiki/SandBoxes which is not talking about FFI though. Furthermore, the plan I have described above is assuming that the introduction of abstraction layers happens on the lua side of code. Is this an advisable approach or would you rather abstract functionality on the statically compiled code (on the C-side)?

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  • Which online/hosted bug tracking tool do you use for your own work and projects?

    - by blueberryfields
    I've accumulated a lot of side projects over the years, which I slowly improve on over time. Whenever I return to one, I take some time reading over text files that include design, recent bugs, next features, etc... that I should be working on - it's not pretty. I'm looking to switch to something more formal. Ideally, this would be a full featured, online, bug tracking system, which allows for free or nearly free bug tracking for my own projects. Also, ideally this would be doable in a private manner - I don't really want everyone to see my side projects and what a mess I've made of some of them.

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  • Make objects slide across the screen in random positions

    - by user3475907
    I want to make an object appear randomly at the right hand side of the screen and then slide across the screen and disapear at the left hand side. I am working with libgdx. I have this bit of code but it makes items fall from the top down. Please help. public EntityManager(int amount, OrthoCamera camera) { player = new Player(new Vector2(15, 230), new Vector2(0, 0), this, camera); for (int i = 0; i < amount; i++) { float x = MathUtils.random(0, MainGame.HEIGHT - TextureManager.ENEMY.getHeight()); float y = MathUtils.random(MainGame.WIDTH, MainGame.WIDTH * 10); float speed = MathUtils.random(2, 10); addEntity(new Enemy(new Vector2(x, y), new Vector2(-0, -speed))); }

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  • Implementing a JS templating engine with current PHP project

    - by SeanWM
    I'm currently working on a PHP project and quickly realizing how useful a templating engine would help me. I have a few tables whose table rows are looped out via a PHP loop. Is it possible to use just a JS templating engine (like Handlebarsjs) to also work with these tables? For example: $arr = array('red', 'green', 'blue'); echo '<table>'; foreach($arr as $value) { echo '<tr><td>' . $value . '</td></tr>'; } echo '</table>'; Now I want to add a column via an ajax call using a JS templating engine. Is this possible? Or do I have to use a templating engine for both server side and client side?

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  • Ubuntu Installer offers to show differences, then doesn-t

    - by R B
    When I was installing updates under 12.04 LTS today, the ubuntu installer warned that there were differences between the local copy of smb.conf and that in the installer package. It offered me a drop/down list of options. I chose one which reads something like "show differences side by side" and clicked the only available button (other than help, I think it was labelled continue) The installer then proceeded with updates and asked for a reboot. Even after rebooting, no comparison was shown. How can I find out now whether I still have my previous smb.conf or the one from the installer, and what the differences are?

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  • How do I get one monitor on top of the other in Ubuntu 10.10?

    - by Jan
    I'm using a laptop and a monitor (wall mounted) over my laptop. I would like to reflect this physical hardware setup in my software screen setup. So that I can move my mouse upward, out of my laptop screen and use the monitor on the wall. I have been searching for a solution for a while, and I hope somone can help me out. I'm using Ubuntu 10.10 "out of the box". Side by side screen setups works just fine, over/under is doesn't work.

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  • Gladinet Cloud Desktop tool to manage Windows Azure Blob Storage from Windows Explorer

    - by kaleidoscope
    Gladinet Cloud Desktop is designed to make it easier for Windows Azure users to manage Windows Azure Blob storage directly from Windows Explorer. The solution makes it possible for Windows Azure Blob storage to be mapped as a virtual network Drive. “You can map multiple Azure Blob Storage Accounts as side-by-side virtual folders in same network drive. You can do drag & drop between local drive and Azure drive. For more information -  http://www.ditii.com/2010/01/04/gladinet-cloud-desktop-tool-to-manage-windows-azure-blob-storage-from-windows-explorer/ For Downloading the tool – http://www.gladinet.com/p/download_starter_direct.htm   Ritesh, D

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  • Multiple enemy array in LibGDX

    - by johnny-b
    I am trying to make a multiple enemy array, where every 30 secods a new bullet comes from a random point. And if the bullet is clicked it should disapear and a pop like an explosion should appear. And if the bullet hits the ball then the ball pops. so the bullet should change to a different sprite or texture. same with the ball pop. But all that happens is the bullet if touched pops and nothing else happens. And if modified then the bullet keeps flashing as the update is way too much. I have added COMMENTS in the code to explain more on the issues. below is the code. if more code is needed i will provide. Thank you public class GameRenderer { private GameWorld myWorld; private OrthographicCamera cam; private ShapeRenderer shapeRenderer; private SpriteBatch batcher; // Game Objects private Ball ball; private ScrollHandler scroller; private Background background; private Bullet bullet1; private BulletPop bPop; private Array<Bullet> bullets; // This is for the delay of the bullet coming one by one every 30 seconds. /** The time of the last shot fired, we set it to the current time in nano when the object is first created */ double lastShot = TimeUtils.nanoTime(); /** Convert 30 seconds into nano seconds, so 30,000 milli = 30 seconds */ double shotFreq = TimeUtils.millisToNanos(30000); // Game Assets private TextureRegion bg, bPop; private Animation bulletAnimation, ballAnimation; private Animation ballPopAnimation; public GameRenderer(GameWorld world) { myWorld = world; cam = new OrthographicCamera(); cam.setToOrtho(true, 480, 320); batcher = new SpriteBatch(); // Attach batcher to camera batcher.setProjectionMatrix(cam.combined); shapeRenderer = new ShapeRenderer(); shapeRenderer.setProjectionMatrix(cam.combined); // This is suppose to produce 10 bullets at random places on the background. bullets = new Array<Bullet>(); Bullet bullet = null; float bulletX = 00.0f; float bulletY = 00.0f; for (int i = 0; i < 10; i++) { bulletX = MathUtils.random(-10, 10); bulletY = MathUtils.random(-10, 10); bullet = new Bullet(bulletX, bulletY); AssetLoader.bullet1.flip(true, false); AssetLoader.bullet2.flip(true, false); bullets.add(bullet); } // Call helper methods to initialize instance variables initGameObjects(); initAssets(); } private void initGameObjects() { ball = GameWorld.getBall(); bullet1 = myWorld.getBullet1(); bPop = myWorld.getBulletPop(); scroller = myWorld.getScroller(); } private void initAssets() { bg = AssetLoader.bg; ballAnimation = AssetLoader.ballAnimation; bullet1Animation = AssetLoader.bullet1Animation; ballPopAnimation = AssetLoader.ballPopAnimation; } // This is to take the bullet away when clicked or touched. public void onClick() { for (int i = 0; i < bullets.size; i++) { if (bullets.get(i).getBounds().contains(0, 0)) bullets.removeIndex(i); } } private void drawBackground() { batcher.draw(bg1, background.getX(), background.getY(), background.getWidth(), backgroundMove.getHeight()); } public void render(float runTime) { Gdx.gl.glClearColor(0, 0, 0, 1); Gdx.gl.glClear(GL30.GL_COLOR_BUFFER_BIT); batcher.begin(); // Disable transparency // This is good for performance when drawing images that do not require // transparency. batcher.disableBlending(); drawBackground(); batcher.enableBlending(); // when the bullet hits the ball, it should be disposed or taken away and a ball pop sprite/texture should be put in its place if (bullet1.collides(ball)) { // draws the bPop texture but the bullet does not go just keeps going around, and the bPop texture goes. batcher.draw(AssetLoader.bPop, 195, 273); } batcher.draw(AssetLoader.ballAnimation.getKeyFrame(runTime), ball.getX(), ball.getY(), ball.getWidth(), ball.getHeight()); // this is where i am trying to make the bullets come one by one, and if removed via the onClick() then bPop animation // should play but does not??? if(TimeUtils.nanoTime() - lastShot > shotFreq){ // Create your stuff for (int i = 0; i < bullets.size; i++) { bullets.get(i); batcher.draw(AssetLoader.bullet1Animation.getKeyFrame(runTime), bullet1.getX(), bullet1.getY(), bullet1.getOriginX(), bullet1.getOriginY(), bullet1.getWidth(), bullet1.getHeight(), 1.0f, 1.0f, bullet1.getRotation()); if (bullets.removeValue(bullet1, false)) { batcher.draw(AssetLoader.ballPopAnimation.getKeyFrame(runTime), bPop1.getX(), bPop1.getY(), bPop1.getWidth(), bPop1.getHeight()); } } /* Very important to set the last shot to now, or it will mess up and go full auto */ lastShot = TimeUtils.nanoTime(); } // End SpriteBatch batcher.end(); } } Thank you

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  • I'm tempted to include easter eggs in my code - will this get me fired?

    - by blueberryfields
    While working on a portion of the code for our application, I've noticed an opportunity to include one of my side projects as an easter egg. I can do this in a way which I am certain will in no way harm anyone, and I've met with a significant and representative sample of our client base - I'm certain that those who have the knowledge and skills required to find the egg, will also find it humorous. How likely is it that I will get fired for including an easter egg in our application? For more context, the application is aimed at enterprise clients, and, while the users of it tend to be technical, geeky and will enjoy the egg, those in charge of purchasing are on the sales/marketing side of things. I can't even begin to guess how they would react. Edit: Yes, I've asked my manager. As you might expect in a corporate environment, the answer was: "I cannot condone this. You're on your own"

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  • Why would you hire in-house software developers instead of outsourcing them to develop a product for your company?

    - by Terence Ponce
    Why would you hire in-house over outsourcing in developing a product for your company? I can only think of a few but I'm not entirely sure if they're good enough reason. This is actually for a debate that I'm going to have in class. I'm more inclined on the outsourcing part but unfortunately, I was asked to switch to the in-house side of the debate. Any ideas? UPDATE Thanks for the answers guys. The debate went well because of them. I'm pretty sure our side won the debate because of the points presented here.

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  • Get collision details from Rectangle.Intersects()

    - by Daniel Ribeiro
    I have a Breakout game in which, at some point, I detect the collision between the ball and the paddle with something like this: // Ball class rectangle.Intersects(paddle.Rectangle); Is there any way I can get the exact coordinates of the collision, or any details about it, with the current XNA API? I thought of doing some basic calculations, such as comparing the exact coordinates of each object on the moment of the collision. It would look something like this: // Ball class if((rectangle.X - paddle.Rectangle.X) < (paddle.Rectangle.Width / 2)) // Collision happened on the left side else // Collision happened on the right side But I'm not sure this is the correct way to do it. Do you guys have any tips on maybe an engine I might have to use to achieve that? Or even good coding practices using this method?

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  • Even More Steroids for JEditorPane

    - by Geertjan
    Got some help from Ralph today and now the JEditorPane is as I want it, e.g., code folds are now supported once you click in the JEditorPane, though there are still some side effects, since this is not how anyone anticipated NetBeans editor APIs being used. But, so far, the side effects (e.g., now the hyperlinks work, but they open a new JavaScript file when you click on one of them, instead of jumping within the JEditorPane itself) are not so terrible. Error checking is also done now, which wasn't there before, i.e., red underlines and error annotations in the right margin. And maybe it's my imagination, but the editor feels a lot snappier, e.g., in code completion, than before. I've checked in the changes, they're all in this file: http://java.net/projects/nb-api-samples/sources/api-samples/content/versions/7.3/misc/CMSBackOffice2/CMSBackOffice2-editor/src/main/java/com/mycompany/cmsbackoffice2editor/GeneralTab.java

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  • Repairing back-facing triangles without user input

    - by LTR
    My 3D application works with user-imported 3D models. Frequently, those models have a few vertices facing into the wrong direction. (For example, there is a 3D roof and a few triangles of that roof are facing inside the building). I want to repair those automatically. We can make several assumptions about these 3D models: they are completely closed without holes, and the camera is always on the outside. My idea: Shoot 500 rays from every triangle outwards into all directions. From the back side of the triangle, all rays will hit another part of the model. From the front side, at least one ray will hit nothing. Is there a better algorithm? Are there any papers about something like this?

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  • MVC 2 in 2 Minutes!

    - by Steve Michelotti
    In a couple of recent Code Camps, I’ve given my presentation: Top 10 Ways MVC 2 Will Boost Your Productivity. In the presentation, I cover all major new features introduced in MVC 2 with a focus on productivity enhancements. To drive the point home, I conclude with a final demo where I build a couple of screens from scratch highlighting many (but not all) of the features previously covered in the talk. A couple of weeks ago, I was asked to make it available online so here it is. In 2 minutes the demo builds a couple screens from scratch that provide a goal setting tracker for a user. MVC 2 features included in the video are: Template Helpers / Editor Templates Server-side/Client-side Validation Model Metadata for View Model HTML Encoding Syntax Dependency Injection Abstract Controllers Custom T4 Templates Custom MVC Visual Studio 2010 Code Snippets The complete code samples and slide deck can be downloaded here: Top 10 Ways MVC 2 Will Boost Your Productivity. Enjoy! (Right-click and Zoom to view in full screen)   Click here for Direct link to video

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  • Optimization of a Hybrid Pagination Scheme

    - by Kaustubh Karkare
    I'm working on a Web Application using node.js in which I'm building a partial copy of the database on the client-side to decrease the load on my server. Right now, I have a function like this (expressed as python-style pseudocode, but implemented in JavaScript): get(table_name,primary_key): if primary_key in cache[table_name]: return cache[table_name][primary_key] else: x = get_data_from_server(table_name,primary_key) # socket.io return cache[table_name][primary_key] = x While this scheme works perfectly well for caching individual rows, I'd like to extend it to support the creation of paginated tables ordered according to the primary_key, and loading additional data using the above function for only the current and possibly the adjacent pages. Now, I don't want to keep the list of primary keys on the server to be retrieved every time I need to change the page (which, for reasons beyond the scope here, will be very frequent), and keeping it on the client side, subject to real-time create/delete events from the server, doesn't seem that good an idea, even after compression (using ranges, instead of individual values). What is the best way to calculate which items are to be displayed on a random page, minimizing the space requirements & the need for communication with the server?

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  • Syncing properties across a game server

    - by Vaughan Hilts
    I'm beginning to implement a simple scripting system into my networked server, and I've hit a snag. Before, I've been wrapping my calls into functions on objects that manipulate objects, but lately I've been finding this to be a pain for simple things. For example, if I set 'player.HP = 1'.. this works server-side. But the player side never sees this change unless I explicitly send a packet to inform the client. For many things like map swapping that require more complicated changes, like change X, Y, Map and do this.. I have a function. That's fine. But what about these small properties I want to sync?

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  • How can I create a dynamic site that is still search-bot friendly?

    - by zuko
    If I want to have a slide effect between pages. You click a link, it is loaded off to the side and then slides in (pushing the old page off the other side). I can imagine using jQuery to do the PHP and the effects... but how do I do something like this that gracefully degrades for users without Javascript, including bots? Possibly more problematic: what if I wanted to have a sort of mural background across the site, perhaps with a parallax scrolling effect, and sliding to other pages reveals more of the, possibly giant image? Again, I can imagine how to do this with lots of fancy jQuery and PHP but it would heavily rely on those. How can I gracefully degrade in a situation like that? Any pointers, articles or books would be greatly appreciated. I keep trying to search for answers but I just get a lot of "theory"-based, unhelpful blogs.

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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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  • How do I get one monitor on top of the other?

    - by Jan
    I'm using a laptop and a monitor (wall mounted) over my laptop. I would like to reflect this physical hardware setup in my software screen setup. So that I can move my mouse upward, out of my laptop screen and use the monitor on the wall. I have been searching for a solution for a while, and I hope somone can help me out. I'm using Ubuntu 10.10 "out of the box". Side by side screen setups works just fine, over/under is doesn't work.

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  • Simple 2D Flight Physics with Box2D

    - by MarkPowell
    I'm trying to build a simple side scroller with an airplane being the player. As such, I want to build simple flight controls with simple but realistic-feeling physics. I'm making use of cocos2D and Box2D. I have a basic system working, but just can't get the physics feeling correct. I am applying force to the plane (which is a b2CircleShape) based on the user's input. So, basically, if the user pushes up, body_->ApplyForce(b2Vec2(10,30), body_->GetPosition()) is called. Similarly, for down -30 is used. This works and the plane flys along with up/down causing it to dive or climb. But it just doesn't feel right. There is no slowdown on climbs, nor speed up during dives. My simple solution is far to simple. How can I get a better feel for a plane climbing/diving? Thanks!

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  • Material usage, one per model or per object?

    - by WSkid
    Is it better (memory, time (of developer), space) to use single model that is unwrapped and uses a single material or to break a model down into appropriate bits, each with their own smaller texture/material? Or does it depend on the target platform as to what is acceptable - ie PC vs tablet? An example: Say you have a typical house with a tiled roof. Model it, make sure everything is attached, unwrap the walls/roof so in your UV template the walls and roof would be in one texture file, side-by-side in say a 512x512 file. Model the roof/walls as separate objects, unwrap them individually and have two UV templates. You could then have a 256x256 file for each one.

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  • So with HTML5 what exactly.....is "supposed" to become phased out.

    - by Mercfh
    So I know HTML5 is the "replacement" for Flash...however it's obviously not mainstream just yet......but what else is it supposed to replace. I ask this because web-dev has always been a secret kinda side-passion of mine (even though I a firmware programmer mostly doing C/Java stuff). And anyway I want to pursue a side thing at doing web design (I know basic XHTML/CSS + some CSS3) But what exactly is I guess...."pointless" to study? JavaScript I assume will always be a huge part of web design? (HTML5 isn't replacing that is it?) What about Ajax and CSS itself?) And then there's Flash....not sure if thats really worth putting effort into? Also there's Adobe Flex/Air......I'm a bit confused if you can't tell.

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  • How can I successfully install Ubuntu 12.10 next to windows 7

    - by Ian
    I have an installation of Windows 7 and I would like to install Ubuntu 12.10 side by side. During the installation of Ubuntu GRUB comes up with an error and gives me the option to select which disk it should be installed to. I have always found this difficult as I am never sure which disk to select. In my case I see one with "Windows bootloader". I was guessing that was the boot disk for my system but having selected it and completing the Ubuntu installation, GRUB did not appear and Windows loaded. I had no way to get to my Ubuntu installation. I then tried another disk for GRUB after receiving the same message on a re-install of Ubuntu but it didn't work either. In stead of fumbling about I thought I would ask here. Thanks for any advice!

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  • How do I Export to excel on aspx page?

    - by meltdownmonk
    I am trying to take data that I request from an access database and put it into and excel file on the client computer. I usually use ajax to request a summary of the data I need. It is formatted into an html table. I need that table to be in an excel format for the user to download. What I have tried already is to use the vb.net code to open excel and silently save the data to a file, however I realized it's the sever side that opens excel, not the client side, in my locally testing of the code, excel would open on my machine and create the file. When running this on the network, I realized excel isn't on the server, I am not sure if I should just install it, or try and steam the file.

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  • Official Ubuntu 10.10 Manual Now Available [Free PDF Download]

    - by Asian Angel
    Do you know someone who is still learning about Ubuntu or is considering trying it out for the first time? Then here is the perfect book to help get them on their way. The Ubuntu Manual Team has recently completed and made available for download their comprehensive 158 page guide on the Ubuntu 10.10 release. If you would like to purchase a regular print copy of the manual click on the left side of the screen (Star Button). For the free PDF version use the right side of the screen (Download Now Button). Download the Getting Started With Ubuntu 10.10 PDF Manual [via Softpedia] Bonus You can also download PDF copies of the manual for Ubuntu 10.04 (First and Second Editions) on the alternate downloads page! Ubuntu Manual Project Alternate Downloads How To Easily Access Your Home Network From Anywhere With DDNSHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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