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  • Modern Game Programming

    - by Alon
    Hey. I'm a software and web developer for ~3 years, and I want to start learning 3D network game programming. What is the most modern & fastest way to write 3D PC games? What language? For graphics, should I use a graphics API like Direct3D/OpenGL or is there something less painful? What math/physics skills should I know before starting? Thank you.

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  • JRadio Menu buttons - JAVA

    - by user337465
    I have a relatively easy question. I have to create a java GUI to do math based calculations. I have to have a menu item that will double the variable that I am doing calculations with. For example variable = 1 if radio button = selected{ variable = variable * 2 } So, how would I achieve the if statement there? thankyou

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  • Lotus view column compare to string/integer

    - by Kris.Mitchell
    I have a lotus view that stores a number. I need to perform some math against the value, but I am having a lot of problems getting the types to match up. doc.numOfGold = numGold and CInt(doc.numOfGold) = numGold and CInt(doc.numOfGold) = CInt(numGold) and doc.numOfGold = CInt(numGold) all return type mismatch. I've tried changing the column properties to treat it as a decimal, with no better luck. Any thoughts? Thanks!

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  • LaTeX -> dvi/pdf/ps -> list of (x, y, font_name, character_id)

    - by anon
    Input: I have a LaTeX file, with plain text & math formulas. Desired output: I want a list of elements, where each element is: x-coordinate y-coordinate font_name character_id Basically, I want to take a LaTeX file, r"render it", but instead of printing it / getting an image, I want it to say "okay, you have a Sigma symbol here, then you have a 'x' symbol there, ...) What's the easiest way to achieve this? (I'm on Linux) Thanks!

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  • Add class to elements which already have a class

    - by bwstud
    I have a group of divs which I'm dynamically generating when a button is clicked with the class, "brick". This gives them dimension and starting position of top: 0. I'm trying to get them to animate to the bottom of the view using a css transition with a second class assignment which gives them a bottom position: 0;. Can't figure out the syntax for adding a second class to elements with a pre-existing class. On inspection they only show the original class of, "brick". HTML <!DOCTYPE html> <html> <head> <script src="http://code.jquery.com/jquery-2.1.0.min.js"></script> <meta charset="utf-8"> <title>JS Bin</title> </head> <body> <div id="container"> <div id="button" >Click Me</div> </div> </body> </html> CSS #container { width: 100%; height: 100vh; padding: 10vmax; } #button { position: fixed; } .brick { position: relative; top: 0; height: 10vmax; width: 20vmax; background: white; margin: 0; padding: 0; transition: all 1s; } .drop { transition: all 1s; bottom 0; } The offending JS: var brickCount = function() { var count = prompt("How many boxes you lookin' for?"); for(var i=0; i < count; i++) { var newBrick = document.createElement("div"); newBrick.className="brick"; document.querySelector("#container") .appendChild(newBrick); } }; var getBricks = function(){ document.getElementByClass("brick"); }; var changeColor = function(){ getBricks.style.backgroundColor = '#'+Math.floor(Math.random()*16777215).toString(16); }; var addDrop = function() { getBricks.brick = "getBricks.brick" + " drop"; }; var multiple = function() { brickCount(); getBricks(); changeColor(); addDrop(); }; document.getElementById("button").onclick = function() {multiple();}; Thanks!

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  • Workaround for stopping propagation with live()?

    - by bobsoap
    I've run into the problem that has been addressed here without a workaround: I can't use stopPropagation() on dynamically spawned elements. I've tried creating a condition to exclude a click within the dimensions of the spawned element, but that doesn't seem to work at all. Here is what I got: 1) a large background element ("canvas") that is activated to be "sensitive to clicks on it" by a button 2) the canvas, if activated, catches all clicks on it and spawns a small child form ("child") within it 3) the child is positioned relative to the mouse click position. If the mouse click was on the right half of the canvas, the child will be positioned 200 pixels to the left of that spot. (On the right if the click was in the left half) 4) every new click on the canvas removes the existing child (if any) and spawns a new child at the new position (relative to the click) The problem: Since the spawned child element is on top of the canvas, a click on it counts as a click on the canvas. Even if the child is outside of the boundaries of the canvas, clicking on it will trigger the action as described in 4) again . This shouldn't happen. =========== CODE: The button to activate the canvas: $('a#activate').click(function(event){ event.preventDefault(); canvasActive(); }); I referenced the above to show you that the canvas click-catching is happening in a function. Not sure if this is relevant... This is the function that catches clicks on the canvas: function canvasActive() { $('#canvas').click(function(e){ e.preventDefault(); //get click position relative to canvas posClick = { x : Math.round(e.pageX - $(this).offset().left), y : Math.round(e.pageY - $(this).offset().top) }; //calculate child position if(posClick.x <= $canvas.outerWidth(false)/2) { posChild = { x: posClick.x + 200, //if dot is on the left side of canvas y: posClick.y }; } else { posChild = { x: posClick.x - 600, //if dot is on the right y: posClick.y }; } $(this).append(markup); //markup is just the HTML for the child }); } I left out the unimportant stuff. The question is: How can I prevent a click inside of a spawned child from executing the function? I tried getting the child's dimensions and doing something like "if posClick is within this range, don't do anything" - but I can't seem to get it right. Perhaps someone has come across this dilemma before. Any help is appreciated.

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  • Elements added with appendTo() not immediately available

    - by Zip Gun Jim
    I'm having a problem with elements added with appendTo() not being immediately available in the DOM. First, I'm reading some data from a JSON file and then appending some html to a div. jsonUrl = "js/performers.json"; $.getJSON(jsonUrl, function(json) { $.each(json.performers, function(i, performer) { var html = '<div class="performer_mini">'; html += '<img src="' + performer.thumbnail + '" alt="' + performer.name + '" /><br />'; html += performer.name + '<br /></div>'; $(html).appendTo("div#performer_spotlight"); }); }); Then I'm calling a random shuffler plugin to show one of the added divs at a time. $("#performer_spotlight").randomShuffler(".performer_mini", 3000, 3000, 9000); The random shuffler does the following: (function($) { $.fn.randomShuffler = function(shuffledElements, fadeInTime, fadeOutTime, timeout) { fadeInTime = fadeInTime || 3000; fadeOutTime = fadeOutTime || 3000; timeout = timeout || 9000; $(shuffledElements).hide(); var $old_element; var $new_element; var old_index = 0; var new_index = 0; function shuffleElement() { $old_element = $new_element; old_index = new_index; while ($(shuffledElements).length > 0 && old_index == new_index) { // don't display the same element twice in a row new_index = Math.floor(Math.random()*$(shuffledElements).length); } $new_element = $(shuffledElements + ":eq(" + new_index + ")"); if ($old_element != undefined) { $old_element.fadeOut(fadeOutTime, function() { $new_element.fadeIn(fadeInTime); }); } else { $new_element.fadeIn(fadeInTime); } setTimeout(shuffleElement, timeout); } $(this).show(); shuffleElement(); } })(jQuery); The first time the shuffleElement() function is called $(shuffledElements).length equals 0, so no element is displayed. On the next call to shuffleElement(), the elements added with appendTo() are available and one is selected at random as expected. Everything works correctly after that. Is there some way to refresh the DOM or make these elements available to jQuery immediately after I add them with appendTo()? Any other suggestions for how to accomplish this?

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  • Gaussian smoothing in MatLab

    - by qpr92
    For an m x n array of elements with some noisy images, I want to perform Gaussian smoothing. How do you do that in MatLab? I've read the math involves smoothing everything with a kernel at a certain scale but have no idea how to do this in MatLab. Im pretty new to this...

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  • Equivalent of System.Windows.Forms.Cursor in Web Application(Asp.Net)

    - by Vishwa
    Hi I have a code in windows application now i am trying to implement in web Application but it is showimg that it ths no cursor class (System.Windows.Forms.Cursor )so..wat is the equivalent in web application. Here is my code private void btnGo_Click(System.Object sender, System.EventArgs e) { this.Cursor = Cursors.WaitCursor; Application.DoEvents(); // Load the images. Bitmap bm1 = (Bitmap) (Image.FromFile(txtFile1.Text)); Bitmap bm2 = (Bitmap) (Image.FromFile(txtFile2.Text)); // Make a difference image. int wid = Math.Min(bm1.Width, bm2.Width); int hgt = Math.Min(bm1.Height, bm2.Height); Bitmap bm3 = new Bitmap(wid, hgt); // Create the difference image. bool are_identical = true; int r1; int g1; int b1; int r2; int g2; int b2; int r3; int g3; int b3; Color eq_color = Color.White; Color ne_color = Color.Transparent; for (int x = 0; x <= wid - 1; x++) { for (int y = 0; y <= hgt - 1; y++) { if (bm1.GetPixel(x, y).Equals(bm2.GetPixel(x, y))) { bm3.SetPixel(x, y, eq_color); } else { bm1.SetPixel(x, y, ne_color); are_identical = false; } } } // Display the result. picResult.Image = bm1; Bitmap Logo = new Bitmap(picResult.Image); Logo.MakeTransparent(Logo.GetPixel(1, 1)); picResult.Image = (Image)Logo; this.Cursor = Cursors.Default; if ((bm1.Width != bm2.Width) || (bm1.Height != bm2.Height)) { are_identical = false; } if (are_identical) { MessageBox.Show("The images are identical"); } else { MessageBox.Show("The images are different"); } //bm1.Dispose() // bm2.Dispose() }

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  • New to MVC. Actionscript 3.0 Appreciate your help.

    - by Combustion007
    Hello Everyone, I am new to design patterns and am trying to learn the MVC implementation. I have written four classes: DataModel DataView DataController Main Main serves as the application facade. The main FLA is called HelloWorld. I have a symbol called "Box" in HelloWorld. I just would like to add an instance of the "Box" on the stage. Eventually I would like to place a button and when the button is clicked, the Box instance color will be changed. I would appreciate any help, please help me figure out what am I doing wrong. Here are my Classes: DATAMODEL CLASS: package { import flash.events.*; public class DataModel extends EventDispatcher { public static const UPDATE:String = "modelUpdate"; private var _color:Number = (Math.round(Math.random()* 0xffffff)); public function DataModel() { trace("DATA MODEL INIT"); } public function get color():Number { return _color; } public function set color(p:Number):void { _color = p; notifyObserver(); } public function notifyObserver():void { dispatchEvent(new Event(DataModel.UPDATE)); } } } //DATACONTROLLER CLASS: package { import flash.events.; import flash.display.; import flash.errors.*; public class DataController { private var _model:DataModel; public function DataController(m:DataModel) { trace("DATACONTROLLER INIT"); _model = m; } } } DATAVIEW CLASS: package { import flash.events.; import flash.display.; import flash.errors.*; public class DataView extends Sprite { private var _model:DataModel; private var _controller:DataController; private var b:Box; public function DataView(m:DataModel, c:DataController) { _model = m; _controller = c; b = new Box(); b.x = b.y = 100; addChild(b); } } } And Finally THE FACADE: package { import flash.display.; import flash.events.; import flash.text.; import flash.errors.; public class Main extends Sprite { private var _model:DataModel; private var _controller:DataController; private var _view:DataView; public function Main(m:DataModel, c:DataController, v:DataView) { _model = m; _controller = c; _view = v; addChild(v); } } } When I test the movie: I get this error: ArgumentError: Error #1063: Argument count mismatch on Main(). Expected 3, got 0. Thanks alot.

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  • C#: Perform Operations on GPU, not CPU (Calculate Pi)

    - by Alex
    Hello, I've recently read a lot about software (mostly scientific/math and encryption related) that moves part of their calculation onto the GPU which causes a 100-1000 (!) fold increase in speed for supported operations. Is there a library, API or other way to run something on the GPU via C#? I'm thinking of simple Pi calculation. I have a GeForce 8800 GTX if that's relevant at all (would prefer card independent solution though). Any hints are appreciated!

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  • CS Majors: Hardest concept(s) you learned in school?

    - by Mark Lubin
    For the CS majors out there what were the hardest CS classes or concepts that you learned in your undergraduate schooling? Did you find once you learned the basics,(data structs, OOP fundamentals, discrete math, pointers, recursion, etc) the rest followed naturally or did you hit a wall at any point in your higher classes like OS'es and Compilers? Thanks for the input!

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  • How to access CRM 4.0 settings programmatically?

    - by Shaamaan
    Some of the plugins I wrote (re)calculate various prices, and I used Math.Round to keep results accurate with the default 2 digit setting in CRM. But I figured... what if a user decides to set his CRM to use a different precision? So, I need to access the CRM settings programmatically, so that my functions can work with whatever setting the user chooses. How would I go about accessing the General (and, possibly, other) CRM settings from my code?

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  • Whats the easiest way to convert a long in C to a char*?

    - by dh82
    What is the clean way to do that in C? wchar_t* ltostr(long value) { int size = string_size_of_long(value); wchar_t *wchar_copy = malloc(value * sizeof(wchar_t)); swprintf(wchar_copy, size, L"%li", self); return wchar_copy; } The solutions I came up so far are all rather ugly, especially allocate_properly_size_whar_t uses double float base math.

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  • Does knowing a Natural Language well help with Programming?

    - by Earlz
    We all hear that math at least helps a little bit with programming. My question though, does English or other natural language skills help with programming? I know it has to help with technical documentation, but what about actual programming? Are certain constructs in a programming language also there in natural languages? Does knowing how to write a 20 page research paper help with writing a 20k loc programming project?

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  • Fastest way to find the largest power of 10 smaller than x

    - by peoro
    Is there any fast way to find the largest power of 10 smaller than a given number? I'm using this algorithm, at the moment, but something inside myself dies anytime I see it: 10**( int( math.log10(x) ) ) # python pow( 10, (int) log10(x) ) // C I could implement simple log10 and pow functions for my problems with one loop each, but still I'm wondering if there is some bit magic for decimal numbers.

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  • Python Pandas operate on row

    - by wuha
    Hi my dataframe look like: Store,Dept,Date,Sales 1,1,2010-02-05,245 1,1,2010-02-12,449 1,1,2010-02-19,455 1,1,2010-02-26,154 1,1,2010-03-05,29 1,1,2010-03-12,239 1,1,2010-03-19,264 Simply, I need to add another column called '_id' as concatenation of Store, Dept, Date like "1_1_2010-02-05", I assume I can do it through df['id'] = df['Store'] +'' +df['Dept'] +'_'+df['Date'], but it turned out to be not. Similarly, i also need to add a new column as log of sales, I tried df['logSales'] = math.log(df['Sales']), again, it did not work.

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  • How to "grep" out specific lline ranges of a file

    - by Mike
    There are often times I'll grep -l whatev file to find what I'm looking for. Say the output is 1234: whatev 1 5555: whatev 2 6643: whatev 3 If I want to then just extract the lines between 1234 and 5555, is there a tool to do that? For static files I have a script that does wc -l of the file and then does the math to split it out with tail & head but that doesn't work out so well with log files that are constantly being written to.

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