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• Tracking Useful Information

  - by Steve M

  What do the clever programmers here do to keep track of handy programming tricks and useful information they pick up over their many years of experience? Things like useful compiler arguments, IDE short-cuts, clever code snippets, etc. I sometimes find myself frustrated when looking up something that I used to know a year or two ago. My IE favourites probably represent a good chunk of the Internet in the late 1990s, so clearly that isn't effective (at least for me). Or am I just getting old? So.. what do you do?

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• Why is setting HTML5's CanvasPixelArray values ridiculously slow and how can I do it faster?

  - by Nixuz

  I am trying to do some dynamic visual effects using the HTML 5 canvas' pixel manipulation, but I am running into a problem where setting pixels in the CanvasPixelArray is ridiculously slow. For example if I have code like: imageData = ctx.getImageData(0, 0, 500, 500); for (var i = 0; i < imageData.length; i += 4){ imageData.data[i] = buffer[i]; imageData.data[i + 1] = buffer[i + 1]; imageData.data[i + 2] = buffer[i + 2]; } ctx.putImageData(imageData, 0, 0); Profiling with Chrome reveals, it runs 44% slower than the following code where CanvasPixelArray is not used. tempArray = new Array(500 * 500 * 4); imageData = ctx.getImageData(0, 0, 500, 500); for (var i = 0; i < imageData.length; i += 4){ tempArray[i] = buffer[i]; tempArray[i + 1] = buffer[i + 1]; tempArray[i + 2] = buffer[i + 2]; } ctx.putImageData(imageData, 0, 0); My guess is that the reason for this slowdown is due to the conversion between the Javascript doubles and the internal unsigned 8bit integers, used by the CanvasPixelArray. Is this guess correct? Is there anyway to reduce the time spent setting values in the CanvasPixelArray?

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• Why is setting HTML5's CanvasPixelArray values is ridiculously slow and how can I do it faster?

  - by Nixuz

  I am trying to do some dynamic visual effects using the HTML 5 canvas' pixel manipulation, but I am running into a problem where setting pixels in the CanvasPixelArray is ridiculously slow. For example if I have code like: imageData = ctx.getImageData(0, 0, 500, 500); for (var i = 0; i < imageData.length; i += 4){ imageData.data[index] = buffer[i]; imageData.data[index + 1] = buffer[i]; imageData.data[index + 2] = buffer[i]; } ctx.putImageData(imageData, 0, 0); Profiling with Chrome reveals, it runs 44% slower than the following code where CanvasPixelArray is not used. tempArray = new Array(500 * 500 * 4); imageData = ctx.getImageData(0, 0, 500, 500); for (var i = 0; i < imageData.length; i += 4){ tempArray[index] = buffer[i]; tempArray[index + 1] = buffer[i]; tempArray[index + 2] = buffer[i]; } ctx.putImageData(imageData, 0, 0); My guess is that the reason for this slowdown is due to the conversion between the Javascript doubles and the internal unsigned 8bit integers, used by the CanvasPixelArray. Is this guess correct? Is there anyway to reduce the time spent setting values in the CanvasPixelArray?

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• Update a portion UIView

  - by Brett

  Hi; I'm using -setNeedsDisplayinRect to update only a part of my UIView. However, all of my drawing done previously to calling this method is erased. Here is my code in the UIView subclass: -(void)drawRect:(CGRect)rect{ CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBFillColor(context, r, g, b, 1); CGContextSetRGBStrokeColor(context, r, g, b, 1); CGRect arect = CGRectMake(x,y,1,1); CGContextFillRect(context, arect); NSLog(@"drawing"); } and in the view controller: -(void)drawView{ drawingView = [[DrawingView alloc]init]; x=10; y=10; r=0; g=0; b=0; [drawingView setNeedsDisplayInRect:CGRectMake(x, y, 1, 1)]; x=20; y=20; r=0; g=0; b=0; [drawingView setNeedsDisplayInRect:CGRectMake(x, y, 1, 1)]; } I end up with a screen where there is only one pixel at 20,20. Any help with this is so much appreciated. I am a beginner with XCode and am trying to complete a class project asap.

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• Using unions to simplify casts

  - by Steven Lu

  I realize that what I am trying to do isn't safe. But I am just doing some testing and image processing so my focus here is on speed. Right now this code gives me the corresponding bytes for a 32-bit pixel value type. struct Pixel { unsigned char b,g,r,a; }; I wanted to check if I have a pixel that is under a certain value (e.g. r, g, b <= 0x10). I figured I wanted to just conditional-test the bit-and of the bits of the pixel with 0x00E0E0E0 (I could have wrong endianness here) to get the dark pixels. Rather than using this ugly mess (*((uint32_t*)&pixel)) to get the 32-bit unsigned int value, i figured there should be a way for me to set it up so I can just use pixel.i, while keeping the ability to reference the green byte using pixel.g. Can I do this? This won't work: struct Pixel { unsigned char b,g,r,a; }; union Pixel_u { Pixel p; uint32_t bits; }; I would need to edit my existing code to say pixel.p.g to get the green color byte. Same happens if I do this: union Pixel { unsigned char c[4]; uint32_t bits; }; This would work too but I still need to change everything to index into c, which is a bit ugly but I can make it work with a macro if i really needed to.

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• How to draw an unfilled square on top of a stream video using a mouse and track the object enclosed

  - by Haxed

  Hi, I am making an object tracking application. I have used Emgucv 2.1.0.0 to load a video file to a picturebox. I have also taken the video stream from a web camera. Now, I want to draw an unfilled square on the video stream using a mouse and then track the object enclosed by the unfilled square as the video continues to stream. This is what people have suggested so far:- (1) .NET Video overlay drawing(DirectX) - but this is for C++ users, the suggester said that there are .NET wrappers, but I had a hard time finding any. (2) DxLogo sample DxLogo – A sample application showing how to superimpose a logo on a data stream. It uses a capture device for the video source, and outputs the result to a file. Sadly, this does not use a mouse. (3) GDI+ and mouse handling - this area I do not have a clue. And for tracking the object in the square, I would appreciate if someone give me some research paper links to read. Any help as to using the mouse to draw on a video is greatly appreciated. Thank you for taking the time to read this. Many Thanks

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• Loop elements with Jquery and call Omniture s.tl() function to track

  - by ilovewebdev

  Hi, i have a page with a list of items. Each item has a print now link (a.printMe) to print each item. At the end of the list, there's a print all link (a.printAll) to print all items. I want to track number of times an item was printed. If a.printAll link is clicked, then i will send all the item's tracking value to Omniture. I added tracking string into individual item's a.printMe href attribute and track with the following functions: $('a.printMe').click(function() { var value = $(this).attr('href'); track(value); }); $('a.printAll').click(function() { $('a.printMe').each(function() { this.click(); }); // works in IE only. IE 6-8 }); function track(value) { var s = s_gi('account'); s.prop10 = value; s.linkTrackVars = 'prop10'; s.tl(true, 'o'); } The problem is only the last item (in the list) has its value sent to Omniture when i clicked on a.printAll. I finally got the above to work in IE but not Firefox. Anyone encounter this before?

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• random, Graphics point ,searching- algorithm, via dual for loop set

  - by LoneXcoder

  hello and thanks for joining me in my journey to the custom made algorithm for "guess where the pixel is" this for Loop set (over Point.X, Point.Y), is formed in consecutive/linear form: //Original\initial Location Point initPoint = new Point(150, 100); // No' of pixels to search left off X , and above Y int preXsrchDepth, preYsrchDepth; // No' of pixels to search to the right of X, And Above Y int postXsrchDepth, postYsrchDepth; preXsrchDepth = 10; // will start search at 10 pixels to the left from original X preYsrchDepth = 10; // will start search at 10 pixels above the original Y postXsrchDepth = 10; // will stop search at 10 pixels to the right from X postYsrchDepth = 10; // will stop search at 10 pixels below Y int StopXsearch = initPoint.X + postXsrchDepth; //stops X Loop itarations at initial pointX + depth requested to serch right of it int StopYsearch = initPoint.Y + postYsrchDepth; //stops Y Loop itarations at initial pointY + depth requested below original location int CountDownX, CountDownY; // Optional not requierd for loop but will reports the count down how many iterations left (unless break; triggerd ..uppon success) Point SearchFromPoint = Point.Empty; //the point will be used for (int StartX = initPoint.X - preXsrchDepth; StartX < StopXsearch; StartX++) { SearchFromPoint.X = StartX; for (int StartY = initPoint.Y - preYsrchDepth; StartY < StpY; StartY++) { CountDownX = (initPoint.X - StartX); CountDownY=(initPoint.Y - StartY); SearchFromPoint.Y = StartY; if (SearchSuccess) { same = true; AAdToAppLog("Search Report For: " + imgName + "Search Completed Successfully On Try " + CountDownX + ":" + CountDownY); break; } } } <-10 ---- -5--- -1 X +1--- +5---- +10 what i would like to do is try a way of instead is have a little more clever approach <+8---+5-- -8 -5 -- +2 +10 X -2 - -10 -8-- -6 ---1- -3 | +8 | -10 Y +1 -6 | | +9 .... I do know there's a wheel already invented in this field (even a full-trailer truck amount of wheels (: ) but as a new programmer, I really wanted to start of with a simple way and also related to my field of interest in my project. can anybody show an idea of his, he learnt along the way to Professionalism in algorithm /programming having tests to do on few approaches (kind'a random cleverness...) will absolutely make the day and perhaps help some others viewing this page in the future to come it will be much easier for me to understand if you could use as much as possible similar naming to variables i used or implenet your code example ...it will be Greatly appreciated if used with my code sample, unless my metod is a realy flavorless. p.s i think that(atleast as human being) the tricky part is when throwing inconsecutive numbers you loose track of what you didn't yet use, how do u take care of this too . thanks allot in advance looking forward to your participation !

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• Fast pixelshader 2D raytracing

  - by heishe

  I'd like to do a simple 2D shadow calculation algorithm by rendering my environment into a texture, and then use raytracing to determine what pixels of the texture are not visible to the point light (simply handed to the shader as a vec2 position) . A simple brute force algorithm per pixel would looks like this: line_segment = line segment between current pixel of texture and light source For each pixel in the texture: { if pixel is not just empty space && pixel is on line_segment output = black else output = normal color of the pixel } This is, of course, probably not the fastest way to do it. Question is: What are faster ways to do it or what are some optimizations that can be applied to this technique?

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• Integrate SalesForce with IntelliJ IDEA via SVN

  - by Oded

  Is it possible to integrate Issue tracking provider such as SalesForce with IntelliJ IDEA? A user will able to get a list of open issues from SalesForce with IntelliJ ? thanks.

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• Google Website Optimizer: track AJAX

  - by Jorre

  I am tracking AJAX goals in Google Analytics with no problems. But I would like to use Google Website Optimizer to see what buttons or headlines get the most leads in our newsletter subscription form. Since a new subscription only triggers AJAX/Javascript, I cannot add a separate success/thankyou.html page to track in Google Website Analyzer. There is not much to find in Google's documentation about this. Has anyone been able to do this?

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• Is there an equivalent to Trac written in PHP?

  - by Philip Morton

  Is there an equivalent to Trac written in PHP? I need something that integrates with SVN and is free. It should allow me to browse the SVN source, have some kind of bug tracking and show recent changes in the SVN. A wiki isn't essential. Thanks in advance.

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• Light and simple bugtracker for a small team

  - by Varnenchik

  I'm looking for a simple and light tool for tracking ideas and bugs for small physics lab team (4 members). Bugzilla and Trac have too much fields and other stuff for us. I don’t think that we need more than issue descriptions and simple categorization. But we are not happy with text and excel files suggested here. Could you please advise me anything easy to install preferably?

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• Start a git commit message with a hashmark (#)

  - by knittl

  Git treats lines starting with # as comment lines when committing. this is very annoying when working with a ticket tracking system, and trying to write the ticket number at the beginning of the line, e.g. #123 salt hashed passwords git will simply remove the line from the commit message. is there any way to escape the hash? i tried \ and !, but nothing works. whitespaces before # are preserved, so they aren't a working solution to the problem either.

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• JIRA or Trac?

  - by seedhead

  I used Atlassian JIRA for bug and issue tracking at my last job. I absolutely loved it and it was particularly easy on the eyes. My present company is using Trac instead, and while it does do all the basics, I am finding it really lacking, particularly with the inability to easily setup multiple projects and link issues. Oh, and the fact that it uses SQLLite is a bit of an issue for me to. Does anyone have any other good reasons to switch?

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• Is a text file with names/pixel locations something a graphic artist can/should produce? [on hold]

  - by edA-qa mort-ora-y

  I have an artist working on 2D graphics for a game UI. He has no problem producing a screenshot showing all the bits, but we're having some trouble exporting this all into an easy-to-use format. For example, take the game HUD, which is a bunch of elements laid out around the screen. He exports the individual graphics for each one, but how should he communicate the positioning of each of them? My desire is to have a yaml file (or some other simple markup file) that contains the name of each asset and pixel position of that element. For example: fire_icon: pos: 20, 30 fire_bar: pos: 30, 80 Is producing such files a common task of a graphic artist? Is is reasonable to request them to produce such files as part of their graphic work?

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• How to render a retro-like pixel graphics from 3d models?

  - by momijigari

  I was wondering if there's a possibility to render a retro-pixel-like graphics from 3d model in real time? I'm talking about the Starfarer-like graphics. I know it's hand drawn, and it's 2d. But if I need a 3d objects with the same aesthetics? I'm currently working with Flash. But I don't need any ready-solutions, I just want to understand the principle from any other platform if there is one. So if anybody met anything like this I would appreciate your help. (If it's not possible to do in real time, I could at least pre-render a sequence of sprites. It would be much better than creating hundreds of hand-drawn ones)

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• How can i get almost pixel perfect collision detection in a multiplayer game?

  - by Freddy

  I'm currently working on a multiplayer game for iPhone. The problem i have, as with all multiplayer games, is that the other user will always see everything at a non-constant delay. The game I'm making need to have a almost pixel perfect collision detection, but 1 or 2 pixels off is not that big of a deal. How can I possibly get this working? I guess I could just set local player to also be at X ms delay. However this will probably just be worse and feel sloppy when the user input. I know this problem is probably something network programmers deal with everyday and I would be glad if someone could give me a possible solution for this.

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• ManicTime Alternative for Mac OS X

  - by Calcgod

  Is there software like ManicTime for Windows that can track of everything I do in Mac OS X?

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• Is there any online web application for daily activity logs [closed]

  - by user25

  I am looking for daily calendar-like apps, but ones that have some text editor attached for every day. All I want to do is that when I open that page, it should open the text editor for that day and I could enter some data of what I have accomplished, then save it. The next day I'd like it so when I open the application, then I can go to new page, but I have all of the previous day's data to have a look at what I have done. Something like Google calendar, but I need an associated text editor to paste some notes, stuff, etc. on a daily basis with logs.

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• Is there an application that allows me to track changes to the operating system when installing software?

  - by PeanutsMonkey

  For example I need to know the files created by the installation, the registry key entries, system changes, etc. It would be ideal if I could revert the installation. The solution should not be virtualized. It could be a combination of sandboxing e.g. sandboxie however with the ability to view the registry changes, directory and file updates & changes, etc. I used to be able to use Altiris SVS however it is not supported on Windows 7, Windows 2008, etc. The solution should be ideally free.

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• Project management, timesheet and planning software

  - by hfidgen

  Hiya, I'm trying to find an integrated PM solution which will give my business all of the following: Timesheeting so we can track time spent on tasks Holiday planner (integrated with timesheet and project management Project management tool, integrating the above, with milestones, gantt chart, dependancies etc. Forecasting ability (nice to have, but not a requirement) Reporting capability - especially time spent on projects, costs etc. Now yeah, that's quite a lot of functionality, I appreciate that! But currently we've got 3 systems, none of which really talk to each other and it's a right headache. So far we've looked at: OpenWorkbench - not enough features Basecamp - not enough features and too reliant on online MS Project - too expensive? Can anyone throw some other hats into the ring which maybe I've not heard about? Really interested to hear how other people have approached this, it's not an unusual business requirement! Thanks!

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• monitor http traffic from non-browser

  - by Ananth

  hi, I want to monitor http request generated out of a exe. Is there any tool that can help me? Actually, an exe would call my asp.net web page to register a user. The exe constructs the request with all the data in it. when the request reaches my web page, I don't see any data. I wan to monitor the Request object and the traffic to find the reality. Any help is appreciated. Thanks. Ananth

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• Do out-of-office replies get sent to the return-path header?

  - by Brian Armstrong

  I always thought that the return-path header was used for bounced messages, so I have my email newsletter software setup to unsubscribe anyone whose email address replies back to the return-path email address. But recently some users started telling me their out-of-office replies where unsubscribing them. Do out-of-office replies get sent to the return-path on some email servers? I could check all emails to that address and see if they have the "message/delivery-status" content-type in one of the parts, but I wasn't sure if this was necessary.

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• Keeping websites from knowing where I live

  - by D Connors

  This questions is related to issues and practicality, not security. I live in Brazil and, apparently, every single website I visit knows about it. Usually that's okay. But there are quite a few sites that don't make use of that information adequately. For instance: Bing keeps thinking that Brazilian pages are way more relevant to me than American ones (which they're not). google.com always redirects me to google.com.br Microsoft automatically sends me to horribly translated support pages in Portuguese (which would just be easier to read in English). These are just a few examples. Usually it's stuff I can live with (or work around), but some of them are just plain irritating. I have geolocation disabled in Firefox, so I guess they're either getting this information from my IP or from Windows itself (which I bought here). Is there a way to avoid this? Either tell them nothing or make them think I live somewhere else?

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