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  • Finding the contact point with SAT

    - by Kai
    The Separating Axis Theorem (SAT) makes it simple to determine the Minimum Translation Vector, i.e., the shortest vector that can separate two colliding objects. However, what I need is the vector that separates the objects along the vector that the penetrating object is moving (i.e. the contact point). I drew a picture to help clarify. There is one box, moving from the before to the after position. In its after position, it intersects the grey polygon. SAT can easily return the MTV, which is the red vector. I am looking to calculate the blue vector. My current solution performs a binary search between the before and after positions until the length of the blue vector is known to a certain threshold. It works but it's a very expensive calculation since the collision between shapes needs to be recalculated every loop. Is there a simpler and/or more efficient way to find the contact point vector?

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  • Security Tips for super user in Ubuntu 11.10?

    - by Gaurav_Java
    Ubuntu is a relatively safe but this should not prevent you to be vigilant. I'm working on securing Ubuntu 11.10 and was looking for every tip to secure my Ubuntu 11.10 and upcoming version 12.04. I go through this question . But my Question is Begin as Super User and as Normal user also. Which is Best tools which I can use for preventing my data? What Services and features I Enable Manually after installing ubuntu ? What security measure I should take? What i don't do ? What are other precaution some takes as super user? what are Normal security stay patched in ubuntu? and if i am missing something then please add them

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  • Linux Books For Windows/C++ Programmers?

    - by John Dibling
    I'm a Windows C++ programmer with a great deal of experience, and I'm looking for book recommendations to get up to speed with programming in Linux (specifically RHE 6). Ideally, I'd like a book geared specifically to my needs. Something along the lines of "Linux C++ Programming for Windows Experts" would be nice. :) I'm open to any recommendations you have. My domain is primarily financial market data servers (no GUIs) and simple console apps. I do a lot of multithreading, a lot of networking, not a lot of user interface stuff. I know C++0x, but our production codebase can only use C++. Thanks for your recommendations for books and/or resources!

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  • Web application framework for embedded systems?

    - by datenwolf
    I'm currently developing the software for a measurement and control system. In addition to the usual SCPI interface I'd also give it a nice HTTP frontend. Now I don't want to reinvent the wheel all over again. I already have a simple HTTPD running, but I don't want to implement all the other stuff. So what I'm looking for is a web application toolkit targeted at embedded system development. In particular this has to run on a ARM Cortex-M4, and I have some 8k of RAM available for this. It must be written in C. Is there such a thing or do I have to implement this myself?

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  • Architecture for Social Graph data that has a Time Frame Associated?

    - by Jay Stevens
    I am adding some "social" type features to an existing application. There are a limited # of node & edge types. Overall the data itself is relatively small (50,000 - 70,000 for each type of node) there will be a number of edges (relationships) between them (almost all directional). This, I know, is relatively easy to represent with an SDF store (such as BrightstarDB) or something like Microsoft's Trinity (or really many of the noSQL options). The thing that, I think, makes this a unique use case is that each relationship will have a timeframe associated with it (start and end dates). Right now, I'm thinking of just storing this in a relational structure and dealing with the headaches of "traversing the graph", but I'm looking for suggestions on a better approach (both in terms of data structure and server): Column ================ From_Node_ID Relationship To_Node_ID StartDate EndDate Any suggestions or thoughts are welcomed.

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  • I'm 15 years old. What would you recommend for resources?

    - by JacKeown
    Hi. I'm a 15 year old kid who seems to excel in all of his classes, likes talking in 3rd person, and wants to learn more about programming and a little about html/php stuff. I already know a little python and I'm hoping to eventually learn Java/Javascript and C. I've been looking around and I've found some online lectures like this and some other tutorials that are so mind numbingly boring and difficult to understand...I was wondering if any of you knew of any good books or other resources that would actually teach me everything I'd need to know incrementally... Thanks in advance!

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  • User Experience Guidance for Developers: Anti-Patterns

    - by ultan o'broin
    Picked this up from a recent Dublin Google Technology User Group meeting: Android App Mistakes: Avoiding the Anti-Patterns by Mark Murphy, CommonsWare Interesting approach of "anti-patterns" aimed at mobile developers (in this case Android), looking at the best way to use code and what's in the SDK while combining it with UX guidance (the premise being the developer does the lot). Interestingly, the idea came through that developers need to stop trying to make one O/S behave like another--on UX grounds. Also, pretty clear that a web-based paradigm is being promoting for Android (translators tell me that translating an Android app reminded them of translating web pages too). Haven't see the "anti"-approach before, developer cookbooks and design patterns sure. Check out the slideshare presentation.

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  • Question about Target parameter of Matrix.CreateLookAt

    - by manning18
    I have a newbie question that's causing me a little bit of confusion when experimenting with cameras and reading other peoples implementations - does this parameter represent a point or a vector? In some examples I've seen people treat it like a specific point they are looking at (eg a position in the world), other times I see people caching the orientation of the camera in a rotation matrix and simply using the Matrix.Forward property as the "target", and other times it's a vector that's the result of targetPos - camPos and also I saw a camPos + orientation.Forward I was also just playing around with hard-coded target positions with same direction eg 1 to 10000 with no discernible difference in what I saw in the scene. Is the "Target" parameter actually a position or a direction (irrespective of magnitude)? Are there any subtle differences in behaviors, common mistakes or gotchas that are associated with what values you provide, or HOW you provide this paramter? Are all the methods I mentioned above equivalent? (sorry, I've only recently started and my math is still catching up)

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  • virtual host not working in windows7 xampp

    - by K.B Panamaldeniya-littletipz
    hi i am using windows7 and xampp , i want to create a virtual host . so i added 127.0.0.1 myawesomeproject to my C:\Windows\System32\drivers\etc\hosts like this # Copyright (c) 1993-2009 Microsoft Corp. # # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. # # This file contains the mappings of IP addresses to host names. Each # entry should be kept on an individual line. The IP address should # be placed in the first column followed by the corresponding host name. # The IP address and the host name should be separated by at least one # space. # # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # 102.54.94.97 rhino.acme.com # source server # 38.25.63.10 x.acme.com # x client host # localhost name resolution is handled within DNS itself. 127.0.0.1 localhost 127.0.0.1 myawesomeproject ::1 localhost and i added some lines to C:\xampp\apache\conf\extra\httpd-vhosts.conf like this # # Virtual Hosts # # If you want to maintain multiple domains/hostnames on your # machine you can setup VirtualHost containers for them. Most configurations # use only name-based virtual hosts so the server doesn't need to worry about # IP addresses. This is indicated by the asterisks in the directives below. # # Please see the documentation at # <URL:http://httpd.apache.org/docs/2.2/vhosts/> # for further details before you try to setup virtual hosts. # # You may use the command line option '-S' to verify your virtual host # configuration. # # Use name-based virtual hosting. # NameVirtualHost *:80 # # VirtualHost example: # Almost any Apache directive may go into a VirtualHost container. # The first VirtualHost section is used for all requests that do not # match a ServerName or ServerAlias in any <VirtualHost> block. # ##<VirtualHost *:80> ##ServerAdmin [email protected] ##DocumentRoot "C:/xampp/htdocs/dummy-host.localhost" ##ServerName dummy-host.localhost ##ServerAlias www.dummy-host.localhost ##ErrorLog "logs/dummy-host.localhost-error.log" ##CustomLog "logs/dummy-host.localhost-access.log" combined ##</VirtualHost> ##<VirtualHost *:80> ##ServerAdmin [email protected] ##DocumentRoot "C:/xampp/htdocs/dummy-host2.localhost" ##ServerName dummy-host2.localhost ##ServerAlias www.dummy-host2.localhost ##ErrorLog "logs/dummy-host2.localhost-error.log" ##CustomLog "logs/dummy-host2.localhost-access.log" combined ##</VirtualHost> <VirtualHost *> DocumentRoot "C:\xampp\htdocs" ServerName localhost </VirtualHost> <VirtualHost *> <VirtualHost *:80> ServerAdmin [email protected] DocumentRoot c:\myawesomeproject ServerName localhost <Directory "c:\myawesomeproject"> Order allow,deny Allow from all </Directory> </VirtualHost> i created a folder called myawesomeproject in my c drive . when i type http://myawesomeproject it is rederecting to http://myawesomeproject/xampp i added another folder 'test' inside myawesomeproject . so the path to 'test' is C:/myawesomeproject/test . the problem is when i type http://myawesomeproject/test it gives an error. it says Object not found! The requested URL was not found on this server. If you entered the URL manually please check your spelling and try again. If you think this is a server error, please contact the webmaster. Error 404 myawesomeproject 8/22/2011 4:30:29 PM Apache/2.2.17 (Win32) mod_ssl/2.2.17 OpenSSL/0.9.8o PHP/5.3.4 mod_perl/2.0.4 Perl/v5.10.1 why is this . how can i create a virtual host........................ :(

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  • FIX adapter for StreamInsight

    - by Roman Schindlauer
    Over the last couple of month, Rapid Addition, a leading FIX and FAST solutions provider for the financial services industry, has been working closely with the StreamInsight team to enable StreamInsight Complex Event Processing queries to receive input feeds from Rapid Addition’s FIX engine and to send result events back into FIX. Earlier today, Toby Corballis from Rapid Addition blogged about these capabilities here on HedgeHogs. We are very excited to demonstrate these capabilities at the SIFMA conference in New York. The session will take place tomorrow, Tuesday, 11am – 12noon, at the Hilton Hotel New York, 1335 Avenue of the Americas, East Suite 4th floor. Torsten Grabs from the StreamInsight team will join the RapidAddition and local Microsoft teams for the session.  If you are interested in attending the session please register at http://bit.ly/c0bbLL. We are looking forward to meeting you tomorrow at SIFMA! Best regards,The StreamInsight Team

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  • Displaying google analytics data on my website

    - by anon-user0
    I sale adspace for my websites directly to the advertisers. I ad page where I want to show google anaylytics information that update automatically without me having to manually update everyday or every month. Something like this: http://wstats.net/en/website/riverplate.com#stat_trafic I don't want to use embedded or iframed third party services. I know google has public API and you can connect it to google graph API to to show pretty graphs. There is a tutorial by google here on how to do it: https://developers.google.com/analytics/resources/articles/gdataAnalyticsCharts Few problems: I don't know much javascript The javascript seems to prompt for authntication as opposed to login automatically. (from my understanding by reading comments on the code) Does anyone know of any ready made script that does what I am looking for or know how I can fix this code that will allow me to display analytic info without authenticating? Thanks.

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  • Permanently disabling touchpad in ubuntu 12.04

    - by Andreas
    I'm looking for a way to permanently disable the touchpad in ububtu 12.04 (my computer is a Lenovo Thinkpad Edge on which it isn't possible to disable it in the bios). I tried the applications GPointingDeviceSettings and synaptiks 0.8.1 as well as the applets touchpad-indicator and Jupiter. None of these does the trick of disabling the touchpad permanently. Jupiter comes closest - it remembers that I have disabled the touchpad after restart - but when I login after the computer has been in suspend mode, the touchpad is enabled again. Can anyone help me in disabling the touchpad possibly at a lower level so it won't in any way be enabled unless I choose to enable it? I'm totally new to linux so a detailed explanation would be much appreciated ... The links, so far, doesn't address my question. I have no problem turning the touchpad off and making it stay off after reboot but when I login after the computer has been in an altered power mode it's on again. Isn't there a way to permanently disable a device like touchpad?

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  • Rotate view matrix based on touch coordinates

    - by user1055947
    I'm working on an Android game where I need to rotate the camera around the origin based on the user dragging their finger. My view matrix has initial position of sitting on the negative z and facing origin. I have succeeded in moving the camera through rotation left or right, up or down based on the user dragging the finger, but my problem is obviously that after I drag my finger up/down and rotate say 90 degrees so my intial position of -z is now +y and still facing origin, if I drag my finger left/right I want to rotate from +y to +x, but what happens is it rotates around the pole +y. This is to be expected as I am mapping 2D touch drag coords to 3D space, but I dont know where to start trying to do what I want. Perhaps someone can point me in the right direction, I've been googling for a while now but I don't know what I want to do is called! Edit __ What I was looking for is called an ArcBall, google it for lots of info on it.

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  • Codeigniter Open Source Applications for Coding References

    - by Hafizul Amri
    I choose codeigniter to be my first framework to work with. Now I'm looking for open source applications built based on this framework to be my references for good coding practices and standards. From my previous experiences in application development, it was hard for me to maintain, upgrade, or modify existing applications due to my bad coding practices. Do you have any suggestion of application based on codeigniter framework for me to be referred? So that it can help me to write better coding by referring to their good and maybe best coding pratices. Thank you!

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  • ~/.bashrc return can only 'return' from a function or sourced script

    - by Timothy
    I am trying to setup a OpenStack box to have a look at OpenStack Object Storage (Swift). Looking through the web I found this link; http://swift.openstack.org/development_saio.html#loopback-section I followed the instructions line by line but stuck on step 7 in the "Getting the code and setting up test environment" section. When I execute ~/.bashrc I get; line 6: return: can only 'return' from a function or sourced script. Below is the Line 6 extract from ~/.bashrc. My first reaction is to comment this line out, but I dont know what it does. Can anyone help? #If not running interactively, dont't do anything [ -z "$PS1" ] && return I'm running Ubuntu 12.04 as a VM on Hyper-v if knowing that is useful.

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  • What is the best solution for document archiving?

    - by Anders Wallenquist
    I'm looking for a utility that helps me (and my colleagues) to archive documents in a systematic manner (Like Zeitgeist but permanent). The utility have to clean-out old document from desktops and store them on a server (as automatic as possible and consistent) maybe from just a few locations (Document directory) Documents shall be stored on cheap large media for many years to come - hard disk and file system maybe? Easy to maintain and manage for a small organization. Documents have to be easy to find and restore One systematic manner could be a directory-structure by year, month, user or user, year, month. Its a plus if documents could be linked to a project, if documents could be search-able and if document could also be mail, IM-discussions not only OpenOffice traditional documents. Any ideas?

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  • Interviewing a DBA

    - by kev
    Our Company is in the Process of recuiting a DBA. I have built a group test of questions from basic questions such as Pk and Fk constraints, simple querries(fizzbuzz style) to more advanced things such as indexes, Collation, isolation levels and how to trace deadlocks. However, that is the limit of my knowledge. So my question to all the DBA's is what is the base level knowledge that all DBA's should have? We are really looking for someone that will be able to manage our replication, analyzing some of our slower running queries(that the devs can go to for help) and someone that can trace some of the deadlock issues that we are having. Any help would be most appreciated!

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  • Good php editor

    - by Web Developer
    i have seen through other questions on the topic but most are a bit old. I looking for a good editor for developing on PHP in Linux(ubuntu). Here is my requirements Basic editor features Free Light-Weight Syntax highlighting Code Folding (class,function,if/else/while/foreach block) Code completion Invalid Syntax/Error highlighting as you type Auto code intending Snippet support(pieces of custom or language specific codes that i can insert) Extendable support It would be great if it had the following Debugging support WYSIWYG Code formatting Framework support(cakephp/yii/zend/smarty) Testing support Todo Native look and feel(Gnome) Flex/ROR support is welcome but not a requirement Mysql support I have tried the following editors Netbeans - it bloated, resource hogging and doesnt not have a native look and feel. Eclipse is okay but i cant fold if/while blocks and slow. Gedit can be extended and i have tried it but still i could not fold code or show error. I currently use Geany but it doesn't inform me of syntax errors as i type. If you have ways to solve the problems with above editors they too are also welcome

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  • 11.04 radeon screen tearing oddity

    - by Kevin Qiu
    I have a mobility radeon 5850 running 11.04 and am running catalyst 11.10 drivers. I noticed that whenever I have two windows open, one of top of the other, scrolling results in minor screen tearing, usually around the border of the window on the bottom. When I minimize or close the bottom the tearing goes away. I have tear free desktop enabled and tried looking for this specific issue but couldn't find anyone else with it. It happens in both Unity and Classic. Is there any fix for this?

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  • Toastr Is a Simple Reminder-on-Unlock Tool for Android

    - by Jason Fitzpatrick
    Android: if you’re looking for a dead simple reminder tool, Toastr pops up a reminder when you unlock your lock screen. While there’s no shortage of calendar and reminder tools in the Android Market, most of them are overkill if all you want to set up is a simple pop-up reminder. Toastr is a free app (the premium option unlocks minor tweaks like the ability to alter the font) that allows you to set a simple pop-up notification that persists for a few seconds after you unlock your phone. Toastr [via Addictive Tips] HTG Explains: Why Linux Doesn’t Need Defragmenting How to Convert News Feeds to Ebooks with Calibre How To Customize Your Wallpaper with Google Image Searches, RSS Feeds, and More

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  • Separate shaders from HTML file in WebGL

    - by Chris Smith
    I'm ramping up on WebGL and was wondering what is the best way to specify my vertex and fragment shaders. Looking at some tutorials, the shaders are embedded directly in the HTML. (And referenced via an ID.) For example: <script id="shader_1-fs" type="x-shader/x-fragment"> precision highp float; void main(void) { // ... } </script> <script id="shader_1-vs" type="x-shader/x-vertex"> attribute vec3 aVertexPosition; uniform mat4 uMVMatrix; // ... My question is, is it possible to have my shaders referenced in a separate file? (Ideally as plain text.) I presume this is straight forward in JavaScript. Is there essentially a way to do this: var shaderText = LoadRemoteFileOnSever('/shaders/shader_1.txt');

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  • Resources for improving your comprehension of recursion?

    - by Andrew M
    I know what recursion is (when a patten reoccurs within itself, typically a function that calls itself on one of its lines, after a breakout conditional... right?), and I can understand recursive functions if I study them closely. My problem is, when I see new examples, I'm always initially confused. If I see a loop, or a mapping, zipping, nesting, polymorphic calling, and so on, I know what's going just by looking at it. When I see recursive code, my thought process is usually 'wtf is this?' followed by 'oh it's recursive' followed by 'I guess it must work, if they say it does.' So do you have any tips/plans/resources for building up your skills in this area? Recursion is kind of a wierd concept so I'm thinking the way to tackle it may be equally wierd and inobvious.

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  • Drawing a textured triangle with CPU instead of GPU

    - by Jenko
    I understand the benefits of GPU rendering and such, but for a certain limited application I need to render textured triangles purely using CPU. I've built a 3D engine capable of object handling, transform, projection, culling and the likes ... now all I need is a little code snippet that draws a single textured triangle onto a bitmap... any language accepted! Inputs: Texture bitmap, Triangle U/V/W coords, Triangle X/Y screen coords Output: The textured triangle drawn at the given screen coords I've currently been using a platform function to draw triangles to screen, but I'm looking to handle it myself to speeden up the process.

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  • Import images from camera in KDE with particular directory structure

    - by Sergey
    I have been using f-spot for a few years to manage my photo archive, which is about 50K images at the moment. With the development of f-spot slowing down in the recent years and me switching to KDE, I'm looking at using DigiKam, which seems to be very nice and packed with features beyond my wildest hopes :) One thing I'm missing though is the way f-spot was importing the images: it was creating subdirectories based on the image's shooting date: $HOME/Photos/2011/11/12/IMG_1234.jpg $HOME/Photos/2011/11/13/IMG_1235.jpg $HOME/Photos/2011/11/13/IMG_1236.jpg I don't seem to be able to find a way to make DigiKam to behave like this - although it has some settings to change the image filename according to some mask which may include shooting date, I see now way to tell it to create sub-directories. Is there a way to make DigiKam to behave like this? Or, alternatively, what is a good program to import images from a camera and save them on disk in subdirectories according to their shooting date?

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  • Best Practice for Images in Facebook Pages

    - by BFTrick
    Hello I am looking for best practices when it comes to uploading images on facebook fan pages. I notice on Dell, US Cellular, and the Gap that they load all of their images on one of their web servers. Are there any alternatives? I was hoping for something like being able to upload photos and then hide the gallery. But I couldn't find anything like that. The reason that I ask is that I have access to someone's facebook fan page but not to their webserver so it would be extra work to email someone who does have access the photos and have them upload them to their web server.

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