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  • Data store for capturing votes & aggregating them

    - by Nathan de Vries
    I'm interested in using Node.js as a socket server for stream-based communication with tens of thousands of clients. Clients will be sending votes for particular pieces of content, and receiving near-realtime updates of aggregated vote tallies from the server. The datastore needs to support: Storing the votes Summarising the votes in near-realtime Preventing multiple votes within an arbitrary time period (e.g. clients can only vote once for a piece of content every 1 minute) Something that already has client libraries for Node.js would be preferable.

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  • Python Animation Timing

    - by M3RPHY
    I'm currently working on sprite sheet tool in python that exports the organization into an xml document but I've run into some problems trying to animate a preview. I'm not quite sure how to time the frame rate with python. For example, assuming I have all of my appropriate frame data and drawing functions, how would I go about coding the timing to display it at 30 frames per second (or any other arbitrary rate).

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  • vector drawing canvas in GWT

    - by Limbic System
    Are there are decent implementations of a vector graphics canvas in GWT? I would like to be draw arbitrary shapes and have them react to user input (mouse in/out/click/etc). There are wrappers for the HTML canvas, but that feature is not supported in older browsers (read: IE).

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  • Creating Read-only logs with python

    - by Travis
    I am writing a python script that needs to make a log entry whenever it's invoked. The log created by the script must not be changeable by the user (except root) who invoked the script. I tried the syslog module and while this does exactly what I want in terms of file permissions, I need to be able to put the resulting log file in an arbitrary location. How would I go about doing this?

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  • Setting exit status when creating core dump

    - by Zitrax
    For example calling exit(100) would exit the application with status 100, and calling raise(SIGABRT) aborts the application with status 134 while creating a core dump. But what if I want the core dump with status 100 or any other arbitrary value. How can I do that ? I know there are several signals that triggers a core dump, but they seem to have fixed exit statuses.

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  • What is a good dumbed-down, safe template system for PHP?

    - by Wilhelm
    (Summary: My users need to be able to edit the structure of their dynamically generated web pages without being able to do any damage.) Greetings, ladies and gentlemen. I am currently working on a service where customers from a specific demographic can create a specific type of web site and fill it with their own content. The system is written in PHP. Many of the users of this system wish to edit how their particular web site looks, or, more commonly, have a designer do it for them. Editing the CSS is fine and dandy, but sometimes that's not enough. Sometimes they want to shuffle the entire page structure around by editing the raw HTML of the dynamically created web pages. The templating system used by WordPress is, as far as I can see, perfect for my use. Except for one thing which is critically important. In addition to being able to edit how comments are displayed or where the menu goes, someone editing a template can have that template execute arbitrary PHP code. As the same codebase runs all these different sites, with all content in the same databse, allowing my users to run arbitrary code is clearly out of the question. So what I need, is a dumbed-down, idiot-proof templating system where my users can edit most of the page structure on their own, pulling in the dynamic sections wherever, without being able to even echo 1+1;. Observe the following psuedocode: <!DOCTYPE html> <title><!-- $title --></title> <!-- header() --> <!-- menu() --> <div>Some random custom crap added by the user.</div> <!-- page_content() --> That's the degree of power I'd like to grant my users. They don't need to do their own loops or calculations or anything. Just include my variables and functions and leave the rest to me. I'm sure I'm not the only person on the planet that needs something like this. Do you know of any ready-made templating systems I could use? Thanks in advance for your reply.

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  • Variable Context Question

    - by Soo
    In the following code snippet, if I leave out the line of code that is surrounded by the /////'s, I get an error that reads: "Use of unassigned local variable CurrentDate". It seems a bit silly for me to just give CurrentDate an arbitrary value, is there a better way around this? DateTime CurrentDate; /////////////////////////// CurrentDate = DateTime.Now; /////////////////////////// if(1==1) { CurrentDate = DateTime.Now.AddDays(1); } if(CurrentDate == DateTime.Now) { ... }

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  • Why differs floating-point precision in C# when separated by parantheses and when separated by state

    - by Andreas Larsen
    I am aware of how floating point precision works in the regular cases, but I stumbled on an odd situation in my C# code. Why aren't result1 and result2 the exact same floating point value here? const float A; // Arbitrary value const float B; // Arbitrary value float result1 = (A*B)*dt; float result2 = (A*B); result2 *= dt; From this page I figured float arithmetic was left-associative and that this means values are evaluated and calculated in a left-to-right manner. The full source code involves XNA's Quaternions. I don't think it's relevant what my constants are and what the VectorHelper.AddPitchRollYaw() does. The test passes just fine if I calculate the delta pitch/roll/yaw angles in the same manner, but as the code is below it does not pass: X Expected: 0.275153548f But was: 0.275153786f [TestFixture] internal class QuaternionPrecisionTest { [Test] public void Test() { JoystickInput input; input.Pitch = 0.312312432f; input.Roll = 0.512312432f; input.Yaw = 0.912312432f; const float dt = 0.017001f; float pitchRate = input.Pitch * PhysicsConstants.MaxPitchRate; float rollRate = input.Roll * PhysicsConstants.MaxRollRate; float yawRate = input.Yaw * PhysicsConstants.MaxYawRate; Quaternion orient1 = Quaternion.Identity; Quaternion orient2 = Quaternion.Identity; for (int i = 0; i < 10000; i++) { float deltaPitch = (input.Pitch * PhysicsConstants.MaxPitchRate) * dt; float deltaRoll = (input.Roll * PhysicsConstants.MaxRollRate) * dt; float deltaYaw = (input.Yaw * PhysicsConstants.MaxYawRate) * dt; // Add deltas of pitch, roll and yaw to the rotation matrix orient1 = VectorHelper.AddPitchRollYaw( orient1, deltaPitch, deltaRoll, deltaYaw); deltaPitch = pitchRate * dt; deltaRoll = rollRate * dt; deltaYaw = yawRate * dt; orient2 = VectorHelper.AddPitchRollYaw( orient2, deltaPitch, deltaRoll, deltaYaw); } Assert.AreEqual(orient1.X, orient2.X, "X"); Assert.AreEqual(orient1.Y, orient2.Y, "Y"); Assert.AreEqual(orient1.Z, orient2.Z, "Z"); Assert.AreEqual(orient1.W, orient2.W, "W"); } } Granted, the error is small and only presents itself after a large number of iterations, but it has caused me some great headackes.

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  • An extended Bezier Library or Algorithms of bezier operations

    - by Sorush Rabiee
    Hi, Is there a library of data structures and operations for quadratic bezier curves? I need to implement: bezier to bitmap converting with arbitrary quality optimizing bezier curves common operations like subtraction, extraction, rendering etc. languages: c,c++,.net,python Algorithms without implementation (pseudocode or etc) could be useful too. (especially optimization)

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  • Opening web page within existing web page

    - by Bob Jones
    I need to be able to load web pages from different sites within a page on my site. I am using C# .NET and master pages. Within the content page, I want to be able to load an arbitrary page and display it without any of the browser controls appearing - just the page content.

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  • Export PDF pages to a series of images in Java

    - by dasp
    I need to export the pages of an arbitrary PDF document into a series of individual images in jpeg/png/etc format. I need to do this in in Java. Although I do know about iText, PDFBox and various other java pdf libraries, I am hoping for a pointer to some working example, or some how-to. Thanks.

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  • running python from an android app

    - by Stacia
    Hi everyone, I am trying to run a python script through an application I've written. I found some pages which say that this piece of code is doing it, but I can't figure it out. http://code.google.com/p/android-scripting/source/browse/android/AndroidScriptingEnvironment/src/com/google/ase/locale/LocaleReceiver.java Can someone explain what is going on and how I can edit that to run an arbitrary script file in my project directory?

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  • Show Diff of two trees in Eclipse

    - by ericbodden
    In Eclipse, I am using a TreeViewer to show a custom tree, whose contents are drawn from an ITreeContentProvider. Now I am trying to create a second view that allows me to automatically show a two-way comparisons of two such trees. I found various views for textual comparison within Eclipse, but I could not find an easy way to show the structural differences between two arbitrary trees. Any thoughts?

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  • jQuery $.each(arr, foo) versus $(arr).each(foo)

    - by Brian M. Hunt
    In jQuery, what's the difference between the following two constructions of jQuery.each: // Given var arr = [1,2,3,4], results = [], foo = function (index, element) { /* something done to/with each element */ results.push(element * element); // arbitrary thing. } // construction #1 $.each(arr, foo); // results = [1,4,9,16] // construction #2 $(arr).each(foo); // results = [1,4,9,16] Is there any difference, or is it purely syntax?

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  • Serving files with Turbogears2

    - by Lionel
    How do I serve files from an arbitrary directory with Turbogears2? I have a database with the local path, e.g. /home/myuser/tg2env/MyProject/myproject/files/somefile.jpg tg.url seems to only be able to serve things from the public directory. Is there a widget available, or do I need to write some sort of DownloadController?

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  • Rails: vendor/gems or vendor/plugins?

    - by TheDeeno
    I'm attempting to track my dependencies with git-submodules in my rails app. So far I've added submodules for things like, haml, shoulda, authlogic, etc to 'vendor/plugins'. I've seen indications that I should be using 'vendor/gems' instead though. Question, which directory is the appropriate place to put dependencies being tracked as submodules? Is the choice arbitrary? Thanks

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  • how to determine base of a number?

    - by evil.coder
    Given a integer number and its reresentation in some arbitrary number system. The purpose is to find the base of the number system. For example, number is 10 and representation is 000010, then the base should be 10. Another example: number 21 representation is 0010101 then base is 2. One more example is: number is 6 and representation os 10100 then base is sqrt(2). Does anyone have any idea how to solve such problem?

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  • Formatting Timestamps in Java

    - by Craig H
    Is there a way to format a UTC time into any arbitrary string format I want in java? Basically I was thinking of having some class take the timestamp and I pass it is string telling it how I want it formated, and it returns the formatted string for me. Is there a way to do this?

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  • Noob Question: Wordpress Looping

    - by dclowd9901
    Can someone give me an essential Wordpress Loop and explain to me what's happening with it? I'd like to put together some templates, but I don't do well with blackboxing. In other words, I'm fully capable of writing my own CMS, but when it comes to using someone else's and its arbitrary rules, I'm completely at a loss, and I just can't get my head around the standard loop Wordpress uses. Thanks for your patient guidance.

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  • Variable argument lists in m4

    - by waffleman
    Anyone know how to write an m4 macro to accepts an arbitrary list of parameters? Here is an example for what I want to implement: ADD_OBJECTS_TO_LAYOUT(`LAYOUT_1', (`OBJ_ID_SQUARE', `COLOR_ID_RED')) ADD_OBJECTS_TO_LAYOUT(`LAYOUT_2', (`OBJ_ID_SQUARE', `COLOR_ID_RED'), (`OBJ_ID_CIRCLE', `COLOR_ID_GREEN')) ADD_OBJECTS_TO_LAYOUT(`LAYOUT_3', (`OBJ_ID_CIRCLE', `COLOR_ID_GREEN'), (`OBJ_ID_CIRCLE', `COLOR_ID_BLUE'), (`OBJ_ID_TIRANGLE', `COLOR_ID_RED'))

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  • determing server response encoding

    - by user121196
    not java specific, but when I say OutputStream os = sock.getOutputStream(); is there a way to determine stream's encoding charset? or do I have to know encoding charset ahead of time to properly read it? This is for arbitrary socket connection.

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