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  • Works on development server but it doesn't on Google App Engine (Sessions).

    - by grep
    Hi, I have this code that works just fine on the development server but when I deploy the application, the session isn't created. What am I doing wrong? HttpSession session = req.getSession(true); session.setAttribute("loggedIn", new String("true")); Edit: The sessions are enabled. What I realized now is that the _ah_SESSION variable is not being created, not even on the development server (although it works).

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  • How can I scale movement physics functions to frames per second (in a game engine)?

    - by Richard
    I am working on a game in Javascript (HTML5 Canvas). I implemented a simple algorithm that allows an object to follow another object with basic physics mixed in (a force vector to drive the object in the right direction, and the velocity stacks momentum, but is slowed by a constant drag force). At the moment, I set it up as a rectangle following the mouse (x, y) coordinates. Here's the code: // rectangle x, y position var x = 400; // starting x position var y = 250; // starting y position var FPS = 60; // frames per second of the screen // physics variables: var velX = 0; // initial velocity at 0 (not moving) var velY = 0; // not moving var drag = 0.92; // drag force reduces velocity by 8% per frame var force = 0.35; // overall force applied to move the rectangle var angle = 0; // angle in which to move // called every frame (at 60 frames per second): function update(){ // calculate distance between mouse and rectangle var dx = mouseX - x; var dy = mouseY - y; // calculate angle between mouse and rectangle var angle = Math.atan(dy/dx); if(dx < 0) angle += Math.PI; else if(dy < 0) angle += 2*Math.PI; // calculate the force (on or off, depending on user input) var curForce; if(keys[32]) // SPACE bar curForce = force; // if pressed, use 0.35 as force else curForce = 0; // otherwise, force is 0 // increment velocty by the force, and scaled by drag for x and y velX += curForce * Math.cos(angle); velX *= drag; velY += curForce * Math.sin(angle); velY *= drag; // update x and y by their velocities x += velX; y += velY; And that works fine at 60 frames per second. Now, the tricky part: my question is, if I change this to a different framerate (say, 30 FPS), how can I modify the force and drag values to keep the movement constant? That is, right now my rectangle (whose position is dictated by the x and y variables) moves at a maximum speed of about 4 pixels per second, and accelerates to its max speed in about 1 second. BUT, if I change the framerate, it moves slower (e.g. 30 FPS accelerates to only 2 pixels per frame). So, how can I create an equation that takes FPS (frames per second) as input, and spits out correct "drag" and "force" values that will behave the same way in real time? I know it's a heavy question, but perhaps somebody with game design experience, or knowledge of programming physics can help. Thank you for your efforts. jsFiddle: http://jsfiddle.net/BadDB

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  • Blog post every SharePoint developer should read

    - by ybbest
    I will continuously update the list while I keep diving into SharePoint 2010 SharePoint 2010 and web templates By Vesa Juvone Tools of a SharePoint Consultant – the 2010 edition By Sahil Malik A SharePoint Developer’s Toolchest By Sahil malik Building SharePoint Applications with InfoPath 2010 By David Gerhardt WCM Creating a Page Layout in SharePoint 2010 using Visual Studio 2010 By Becky Bertram

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  • First look at the cloud with Google App Engine and Udacity

    - by Ken Hortsch
    Udacity is free online university and offers a CS253 intro to web development class.  Since I am currently a web developer/architect in ASP.Net (and recent project has brought me back to Java) it is a bit light.  However, it does offer me a nice problem set and my first exposure to writing cloud apps with GAE and Google Datastore. Steve Huffman, who developed reddit, is the instructor and does offer nice real-life stories.  Give it a look.

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  • What external comment system to use for Jekyll powered blog?

    - by Jakub Narebski
    What external comment system (i.e. something like Disqus or perhaps even Hacker News / YCombinator) would you recommend for Jekyll-powered blog (in this case: blog on GitHub Pages), or in more generic term for blog aware static site generator powered blog (which includes beside Jekyll also for example ikiwiki or xfire's growl)? Because a blog without comments is not a blog :-).

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  • Configure Windows Firewall for SQL Server 2008 Database Engine in Windows Server 2008 R2

    I have installed SQL Server 2008 Developer Edition on Windows Server 2008 R2 and I am unable to get connect to SQL Server 2008 Instance from SQL Server 2008 Management Studio which is installed on another remote server. As I am new to Windows Server 2008 R2 it would be great if you can let me know the step by step approach to enable the default port of SQL Server 2008 in Windows Firewall for user connectivity.

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  • The OTN Garage Blog Week in Review

    - by Rick Ramsey
    In case you missed the last few blogs on the OTN Garage (because somebody neglected to cross-post them here), here they are: What Day Is It and Why Am I Wearing a Little Furry Skirt? - Oracle VM Templates, Oracle Linux, Wim Coekaerts, and jet lag. A Real Cutting Edge - Oracle Sun blade systems architecture, Blade Clusters, and best practices. Which Version of Solaris Were You Running When ... - Oracle Solaris Legacy Containers and the Voyager 1 Content Cluster: Understanding the Local Boot Option in the Automatic Installer of Oracle Solaris 11 Express - Resources to help you understand this cool option Rick - System Admin and Developer Community of the Oracle Technology Network

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  • Loading Obj Files in Soya3d engine

    - by John Riselvato
    I recently just found soya3d and from what i have seen through the tutorials i will be able to make exactly what i wanted with python skills. Now i have built this map generator. The only issue is that i can not manage to understand from any documents how to load obj files. At first i figured that i had to convert it to a .data file, but i dont understand how to do this. I just want to load a simple model of a house. I tried using the soya_editor, but i can not figure out at all how to do anything with that. Heres my script so far: import sys, os, os.path, soya, soya.sdlconst width, height = 760, 375 soya.init("Generator 0.1", width, height) soya.path.append(os.path.join(os.path.dirname(sys.argv[0]), "data")) scene = soya.World() model = soya.model.get("house") light = soya.Light(scene) light.set_xyz(0.5, 0.0, 2.0) camera = soya.Camera(scene) camera.z = 2.0 soya.set_root_widget(camera) soya.MainLoop(scene).main_loop() house is in .obj form at folder data/models The error i get is: Traceback (most recent call last): File "introduction.py", line 7, in <module> model = soya.Model.get("house") File "/usr/lib/pymodules/python2.6/soya/__init__.py", line 259, in get return klass._alls.get(filename) or klass._alls.setdefault(filename, klass.load(filename)) File "/usr/lib/pymodules/python2.6/soya/__init__.py", line 268, in load dirname = klass._get_directory_for_loading_and_check_export(filename) File "/usr/lib/pymodules/python2.6/soya/__init__.py", line 194, in _get_directory_for_loading_and_check_export dirname = klass._get_directory_for_loading(filename, ext) File "/usr/lib/pymodules/python2.6/soya/__init__.py", line 171, in _get_directory_for_loading raise ValueError("Cannot find a %s named %s!" % (klass, filename)) ValueError: Cannot find a <class 'soya.Model'> named house! * Soya3D * Quit... So i am figuring that because i dont understand how to turn my files into .data files, i will need to learn that. So my question is, how do i use my own models?

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  • \G like vertical output in MySQL Workbench for show engine innodb status

    - by KCD
    show engine innodb status; is unusable in MySQL Workbench, as shown here: =====================================120329 12:39:32 INNODB MONITOR OUTPUT=====================================Per second averages calculated from the last 17 seconds-----------------BACKGROUND THREAD-----------------srv_master_thread loops: 192438... However show engine innodb status \G is great on the mysql command line client. Is there any \G equivalent on MySQL workbench or better way to get this information?

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  • Can LittleBigPlanet2's engine be used for other ?

    - by Bill
    LittleBigPlanet2 just came out. I've worked with the original LBP level editor a bit and really enjoyed it. I've read that LBP2's featureset in the game is much richer; is it possible to use these advanced features to create different sorts of game other than just a regular platformer? I imagine that something along the lines of a Breakout clone would definitely be manageable, but I'm interested in hearing more about the capabilities of the platform.

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  • Silverlight: Search Engine Optimization

    - by xamlnotes
    I am doing lots of consulting on Silverlight these days. So I was looking into search enabling Sl applications. So I found this great whitepaper on this very subject. I will post more on this same subject as I get into implementing these ideas as well as some of my own I want to try out. Silverlight is really rocking the world today with more and more applications rolling out. So check out this great whitepaper to see whats cooking with SEO for yours. http://www.silverlight.net/learn/whitepapers/seo-for-silverlight/

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  • Tile engine Texture not updating when numbers in array change

    - by Corey
    I draw my map from a txt file. I am using java with slick2d library. When I print the array the number changes in the array, but the texture doesn't change. public class Tiles { public Image[] tiles = new Image[5]; public int[][] map = new int[64][64]; public Image grass, dirt, fence, mound; private SpriteSheet tileSheet; public int tileWidth = 32; public int tileHeight = 32; public void init() throws IOException, SlickException { tileSheet = new SpriteSheet("assets/tiles.png", tileWidth, tileHeight); grass = tileSheet.getSprite(0, 0); dirt = tileSheet.getSprite(7, 7); fence = tileSheet.getSprite(2, 0); mound = tileSheet.getSprite(2, 6); tiles[0] = grass; tiles[1] = dirt; tiles[2] = fence; tiles[3] = mound; int x=0, y=0; BufferedReader in = new BufferedReader(new FileReader("assets/map.dat")); String line; while ((line = in.readLine()) != null) { String[] values = line.split(","); x = 0; for (String str : values) { int str_int = Integer.parseInt(str); map[x][y]=str_int; //System.out.print(map[x][y] + " "); x++; } //System.out.println(""); y++; } in.close(); } public void update(GameContainer gc) { } public void render(GameContainer gc) { for(int y = 0; y < map.length; y++) { for(int x = 0; x < map[0].length; x ++) { int textureIndex = map[x][y]; Image texture = tiles[textureIndex]; texture.draw(x*tileWidth,y*tileHeight); } } } } Mouse Picking Where I change the number in the array Input input = gc.getInput(); gc.getInput().setOffset(cameraX-400, cameraY-300); float mouseX = input.getMouseX(); float mouseY = input.getMouseY(); double mousetileX = Math.floor((double)mouseX/tiles.tileWidth); double mousetileY = Math.floor((double)mouseY/tiles.tileHeight); double playertileX = Math.floor(playerX/tiles.tileWidth); double playertileY = Math.floor(playerY/tiles.tileHeight); double lengthX = Math.abs((float)playertileX - mousetileX); double lengthY = Math.abs((float)playertileY - mousetileY); double distance = Math.sqrt((lengthX*lengthX)+(lengthY*lengthY)); if(input.isMousePressed(Input.MOUSE_LEFT_BUTTON) && distance < 4) { System.out.println("Clicked"); if(tiles.map[(int)mousetileX][(int)mousetileY] == 1) { tiles.map[(int)mousetileX][(int)mousetileY] = 0; } } I never ask a question until I have tried to figure it out myself. I have been stuck with this problem for two weeks. It's not like this site is made for asking questions or anything. So if you actually try to help me instead of telling me to use a debugger thank you. You either get told you have too much or too little code. Nothing is never enough for the people on here it's as bad as something like reddit. Idk what is wrong all my textures work when I render them it just doesn't update when the number in the array changes. I am obviously debugging when I say that I was printing the array and the number is changing like it should, so it's not a problem with my mouse picking code. It is a problem with my textures, but I don't know what because they all render correctly. That is why I need help.

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  • Week in Geek: New Faster IonMonkey JavaScript Engine Added to Firefox Nightly Builds

    - by Asian Angel
    Our latest edition of WIG is filled with news link coverage on topics such as the next version of Photoshop will not support Windows XP, Microsoft has found preloaded malware on PC production lines in China, Internet Explorer 8 users will lose browser support for Google Apps in November, and more. Original wallpaper for the image shown above is available at HD Wallpapers 4 Free. How To Create a Customized Windows 7 Installation Disc With Integrated Updates How to Get Pro Features in Windows Home Versions with Third Party Tools HTG Explains: Is ReadyBoost Worth Using?

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  • JavaOne Blog RSS is here!

    - by Cassandra Clark
    tweetmeme_url = 'http://blogs.oracle.com/javaone/2010/06/javaone_blog_rss_is_here.html'; Share .FBConnectButton_Small{background-position:-5px -232px !important;border-left:1px solid #1A356E;} .FBConnectButton_Text{margin-left:12px !important ;padding:2px 3px 3px !important;} Don't be the last one to know all the juicy details about JavaOne.  Subscribe to the newly implemented RSS feed and see the news as soon as it is posted.  We have a long list of updates to come in the next few weeks; Java University, Schedule Builder, contests, quizzes and much much more. 

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  • Developing JSON API for a Carpool Engine

    - by Siddharth
    I am developing a new set of API methods for carpooling/cab booking, so if a developer needs to develop an app or webportal for carpooling, he can call my JSON API. Basically making it easy for developers. My API current has: AddVehicle AddJourney SearchJourney SubscribeToThisJourney(journey) SubscriberList(journey) to get list of people who have subscribed for this journey AcceptSubscription(subscriber) AcceptedSubcriberList SubscriberList to get list of providers I have subscribed to I need help with replacing subscriber with something else. It's difficult to remember, and confusing when you see 3 methods that mean very different things: SubscriberList, SubscribedToThisJourneyList and AcceptedSubscriberList. Confusing to remember. One is a list of who I have subscribed to Who has subscribed to me Whose subscription I have accepted How can I name these methods to make them easier to understand and remember?

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  • Partner Blog: aurionPro SENA - Mobile Application Convenience, Flexibility & Innovation Delivered

    - by Darin Pendergraft
    About the Writer: Des Powley is Director of Product Management for aurionPro SENA inc. the leading global Oracle Identity and Access Management specialist delivery and product development partner. In October 2012 aurionPro SENA announced the release of the Mobile IDM application that delivers key Identity Management functions from any mobile device. The move towards an always on, globally interconnected world is shifting Business and Consumers alike away from traditional PC based Enterprise application access and more and more towards an ‘any device, same experience’ world. It is estimated that within five years in many developing regions of the world the PC will be obsolete, replaced entirely by cheaper mobile and tablet devices. This will give a vast amount of new entrants to the Internet their first experience of the online world, and it will only be via these newer, mobile access channels. Designed to address this shift in working and social environments and released in October of 2012 the aurionPro SENA Mobile IDM application directly addresses this emerging market and requirement by enhancing administrators, consumers and managers Identity Management (IDM) experience by delivering a mobile application that provides rapid access to frequently used IDM services from any Mobile device. Built on the aurionPro SENA Identity Service platform the mobile application uses Oracle’s Cloud, Mobile and Social capabilities and Oracle’s Identity Governance Suite for it’s core functions. The application has been developed using standards based API’s to ensure seamless integration with a client’s on premise IDM implementation or equally seamlessly with the aurionPro SENA Hosted Identity Service. The solution delivers multi platform support including iOS, Android and Blackberry and provides many key features including: • Providing easy to access view all of a users own access privileges • The ability for Managers to approve and track requests • Simply raising requests for new applications, roles and entitlements through the service catalogue This application has been designed and built with convenience and security in mind. We protect access to critical applications by enforcing PIN based authentication whilst also providing the user with mobile single sign on capability. This is just one of the many highly innovative products and services that aurionPro SENA is developing for our clients as we continually strive to enhance the value of their investment in Oracle’s class leading 11G R2 Identity and Access Management suite. The Mobile IDM application is a key component of our Identity Services Suite that also includes Managed, Hosted and Cloud Identity Services. The Identity Services Suite has been designed and built specifically to break the barriers to delivering Enterprise, Mobile and Social Identity Management services from the Cloud. aurionPro SENA - Building next generation Identity Services for modern enterprises. To view the app please visit http://youtu.be/btNgGtKxovc For more information please contact [email protected]

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