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• Saving and restoring OpenGL model-view

  - by Tom

  I am a new-comer to OpenGL, and much of it remains mysterious to my feeble brain. I have been studying the NeHe demos as well as the Red Book. I am writing an Android application that displays the Earth in the center of the screen. The user can rotate the Earth about any axis (much like a very simple "Google Earth"). This code is working (I based it on the NeHe examples). Now I want to add a feature; the user should be able to save the current model orientation, then later return to that same orientation. For example, the user may save the Earth orientation such that the viewer is looking down at her hometown, and north-east is "up". How do I do this with OpenGL-ES? To capture and save the current orientation, my code could get the current model-view transformation matrix - I think I understand how to do that. But later on how do I apply that saved matrix to restore the view?

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• OpenCV compare two images and get different pixels

  - by Richard Knop

  For some reason the code bellow is not working. I have two 640*480 images which are very similar but not the same (at least few hundred/thousand pixels should be different). This is how I am comparing them and counting different pixels: unsigned char* row; unsigned char* row2; int count = 0; // this happens in a loop // fIplImageHeader is current image // lastFIplImageHeader is image from previous iteration if ( NULL != lastFIplImageHeader->imageData ) { for( int y = 0; y < fIplImageHeader->height; y++ ) { row = &CV_IMAGE_ELEM( fIplImageHeader, unsigned char, y, 0 ); row2 = &CV_IMAGE_ELEM( lastFIplImageHeader, unsigned char, y, 0 ); for( int x = 0; x < fIplImageHeader->width*fIplImageHeader->nChannels; x += fIplImageHeader->nChannels ) { if (row[x] == row2[x]) // the pixel in the first channel (usually G) { count++; } if (row[x+1] == row2[x+1]) // ... second channel (usually B) { count++; } if (row[x+2] == row2[x+2]) // ... third channel (usually R) { count++; } } } } Now at the end I get number 3626 which would seem alright. But, I tried opening one of the images in MS Paint and drawing thick red lines all over it which should increase the number of different pixels substantially. I got the same number again: 3626. Obviously I am doing something wrong here. I am comparing these images in a loop. This line is before the loop: IplImage* lastFIplImageHeader = cvCreateImageHeader(cvSize(640, 480), 8, 3); Then inside the loop I load images like this: IplImage* fIplImageHeader = cvLoadImage( filePath.c_str() ); // here I compare the pixels (the first code snippet) lastFIplImageHeader->imageData = fIplImageHeader->imageData; So lastFIplImageHeader is storing the image from the previous iteration and fIplImageHeader is storing the current image.

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• Blockquote border on tumblr theme

  - by orange

  This is the code for the link block: {block:Link} <div class="post link"> <h2> <a href="{URL}" class="name">{Name}</a></h2> <div class="content"> {block:Description}{Description}{/block:Description} <span class="date"> <a href="{Permalink}">{ShortMonth} {DayOfMonth}, {Year} </a> </span> </div> </div> {/block:Link} What I'm trying to do is add a border-left of of 10px to block quotes. When I try to add this style to block quotes this happens: The block quote border flows into the post title and I don't wish for this to happen, I want the border layout to stay within the content div. I'm using this CSS at the moment: div div div blockquote { border-left: 10px solid red; } Thanks in advance for the help! Just to clarify <div class="post link"> is in another div. Here is the tumblr: http://iamsomething-awesome.tumblr.com/

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• Error loading font file using Imager::Font module in perl

  - by user211808

  use strict; use Imager; use Imager::Font; my $img = Imager->new(); my $file = "D:\\table.png"; $img->open(file=>$file) or die $img->errstr(); # Create smaller version my $thumb = $img->scale(scalefactor=>1.2); my $black = Imager::Color->new( 0, 0, 0 ); my $format; # Autostretch individual channels $thumb->filter(type=>'autolevels'); my $font_filename = "D:\\courbd.ttf"; my $font = Imager::Font->new(file=>$font_filename) or die "Cannot load $font_filename: ", Imager->errstr; for $format ( qw( png gif jpg tiff ppm ) ) { # Check if given format is supported if ($Imager::formats{$format}) { $file.="_low.$format"; print "Storing image as: $file\n"; $thumb->string(x => 50, y => 70, font =>$font, string => "Hello, World!", color => 'red', size => 30, aa => 1); $thumb->write(file=>$file) or die $thumb->errstr; } }

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• Getting started with MIT Proto

  - by Charles

  MIT Proto lacks a basic getting started guide. How do I find a shell that accepts commands like (def foo...) and proto -n 1000 -l -m ...? http://groups.csail.mit.edu/stpg/proto.html I can run in my bash shell: ./proto -n 1000 -s 0.1 -T -l "(red (gradient (= (mid) 0)))" I can't figure out how to run e.g. channel.proto: (def channel (src dst width) (let* ((d (distance src dst)) (trail (<= (+ (gradient src) (gradient dst)) (+ d 0.01))) ;; float error ;; (trail (= (+ (gradient src) (gradient dst)) d)) ) (dilate trail width))) ;; To see a channel calculated from geometric primitives, run: ;; proto -n 1000 -l -m -s 0.5 "(blue (channel (sense 1) (sense 2) 10))" ;; click on a device and hit 't' to set up the source, then click on ;; another device and hit 'y' to designate the destination. At first ;; every device will be blue, but then it should clear and you should ;; see a thick blue path connecting the two devices you selected. Thanks! P.S. Somebody please tag this mit-proto. I can't.

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• Best way to implement some type of ITaggable interface

  - by Jack

  I've got a program I'm creating that reports on another certain programs backup xml files. I've gotten to the point where I need to implement some type of ITaggable interface - but am unsure how to go about it code wise. My idea is that each item (BackupClient, BackupVersion, and BackupFile) should implement an ITaggable interface for highlighting old, out of date, or non-existent files in their HTML or Excel report. The user will be able to specify tags in the settings. My question is this, how can a user dynamically specify a "tag" such as File Date 3 days old? - Background Color = Red. Actually I guess my question is more, how can I, the programmer, implement this dynamically? I was thinking Expression trees, but am unsure this is the way to go as I havn't studied them much. I know my ITaggable interface would have methods such as AddTag(T tag), RemoveTag(T tag), but what exactly specifies the criteria for the tag to be added? I realize this may be subjective, and can be marked as wiki if need be, but I truly am stuck. Any input would be greatly helpful!

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• Cannot press QPushButton in a simple program

  - by shadyabhi

  Basically, I want a simple pushButton with a colorful text which when pressed exits the application. Why cant I press PushButton in this simple program. I am using QT 4.6 on Arch x86_64. #include <QtGui/QApplication> #include <QLabel> #include <QPushButton> #include<QtGui> int main(int argc, char *argv[]) { QApplication a(argc, argv); QMainWindow *Main=new QMainWindow; QPushButton *button = new QPushButton(Main); QLabel *label = new QLabel(Main); label->setText("<h2><i>Hello</i> ""<font color=red>Qt!</font></h2>"); label->setVisible(true); QObject::connect(button, SIGNAL(clicked()),label, SLOT(clear())); label->setAlignment(Qt::AlignCenter|Qt::AlignVCenter); label->setWindowTitle("HelloWorld Test Program"); Main->show(); return a.exec(); }

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• Automatic adition of `using` in CodeRush.

  - by drasto

  I just installed CodeRush Pro (evaluation trial) for Visual Studio and I can say I like it much so far. Comparing to Resharper there is only one type of feature I'm really missing. It is the way CodeRush deals with using. When I type some class name that is not declared in some package listed in using, CodeRush underlines it red as an error(what it is) but if I hover over it with cursor it does not offer me to add using, it merely says it is "Undeclared element". I have to use VS default using addition (move caret to the identifier, hover cursor over that really small box that appears under first letter, click the button that appears and choose for example using System form a drop down menu). Is there a way how to configure CodeRush to offer mi add using when I hover a cursor over highlighted "issue"(that says Undeclared element)? The second part of this is that Resharper has somethink called Type name completion. It some improved intellisense. Lets say you have no using declaration in your file. Then you type something like ICompar and press CTRL+SPACE. Of cause there will be no suggestions. But with Resharper you can press CTRL+ALT+SPACE and you get suggestions of all classes starting with ICompar even if they are not in using. When you choose one of them the correct using is automatically added for you. Is there a way to make CodeRush behave this way ?

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• Crystal Reports Cross Tab Conditional Formatting

  - by ltran

  I would like to achieve a simplified result similar to the "Color Scale" function in Excel i.e. gradient colouring based on the lowest value (red) to highest value (green), except in my cross tab using Crystal Reports 2008. My cross tab looks a little like this: HOURS L1 L2 L3 L4 Total 1 hours | 5 | 0 | 1 | 16 | 22 | 2 hours | 0 | 1 | 0 | 10 | 11 | 3 hours | 8 | 2 | 6 | 12 | 28 | TOTAL |13 | 3 | 7 | 38 | 61 | The principle of my function is find the maximum value in the cross table then use 20%, 40%, 60%, 80% values to colour the background. Function is as follows (in the format background section): if currentfieldvalue < ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.2) then color(255,0,0) else if (currentfieldvalue >= ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.2) and currentfieldvalue < ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.4)) then color(255,192,0) else if (currentfieldvalue >= ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.4) and currentfieldvalue < ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.6)) then color(255,255,0) else if (currentfieldvalue >= ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.6) and currentfieldvalue < ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.8)) then color(146,208,80) else if (currentfieldvalue >= ((Maximum (MakeArray (CurrentColumnIndex, CurrentRowIndex, 1)))*0.8)) then color(0,176,80) It's not elegant, nor does it work properly, any assistance/suggestions would be much appreciated. I wasn't expecting it to be so complicated as originally I was working with the below assuming it would work, except it tells me that "CurrentFieldValue" is not a field. if CurrentFieldValue < ((Maximum (CurrentFieldValue))*0.2) then color(255,0,0) else if ... etc.

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• Java Swing: How to add a CellRenderer for displaying a Date?

  - by HansDampf

  I have a Table: public class AppointmentTableModel extends AbstractTableModel { private int columns; private int rows; ArrayList<Appointment> appointments;... So each row of the table contains one Appointment. public class Appointment { private Date date; private Sample sample; private String comment; private ArrayList<Action> history; public Appointment(Date date, Sample sample, String comment) { this.date = date; this.sample = sample; this.comment = comment; this.history = new ArrayList<Action>(); } public Object getByColumn(int columnIndex) { switch (columnIndex) { case 0: return date;//Date: dd:mm:yyyy case 1: return date;//Time mm:hh case 2: return sample;//sample.getID() int (sampleID) case 3: return sample;//sample.getNumber string (telephone number) case 4: return sample;//sample.getName string (name of the person) case 5: return history;//newst element in history as a string case 6: return comment;//comment as string } return null; I added in comments what this one is going to mean. How would I create CellRenderers to display it like this. table.getColumnModel().getColumn(1).setCellRenderer(new DateRenderer()); I also want to add the whole row to be painted in red when the date is later then the current date. And then another column that holds a JButton to open up another screen with the corresponding Appointment as parameter.

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• Add a banner at the top on unknown HTML page on the fly; Send a note to network user

  - by Vi

  I want to be able to send messages to users of network that my computer routes to. Modifying requested pages, by adding messages like Warning: this access point is going down soon" or Network quota exhausted or You are overusing the network connection and may be banned or Security notice: this is unencrypted network, so everybody around can see this page too It seems the only good solution (as there is no general "Send notice to users of my access point" thing). All traffic is already routed through -j REDIRECT, socat and remote SOCSK5 server, so intercepting unencrypted content should be easy. How it's better to add a message? Just inserting <div style="color:white; background-color:red">Sorry, connect_me access point is going down soon...</div> as the first element of <body> breaks design of some pages (f.e. Wikipedia). Should I also add some "Cache-control" directive to prevent persisting such messages? /* smdclient messages are poor solution, as them are Windows-only and can disturb users not using the network */

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• height autoflow autofill into out div

  - by Brian Putt

  I have a fiddle(http://jsfiddle.net/pwnagecss/LnNYv/) and need help in making it so the classes sideBar, and rightContentWrapper autofill to the height. <div class="wrapper"> <div class="sideBar"> </div> <div class="rightContentWrapper"> <div class="rightContent"> </div> </div> </div> .wrapper { width: 960px; height: 100%; margin: 0 auto 20px auto; padding: 0; background-color:black; } .wrapper:after{ clear: both; display: block; height: 0; visibility: hidden; content: "0020"; } .sideBar { float: left; width: 200px; background-color:blue; min-height: inherit; height: 100%; } .rightContentWrapper { float: left; width: 760px; height: 100%; min-height: inherit; } .rightContent { margin: 0 auto; background-color: red; min-height: inherit; } Any help is appreciated

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• How to resize div element less than its content?

  - by andDaviD

  I have a table and there is a TreeView in a cell. Here is my code: <style> #leftPanel { width:60px; height:'100%'; border:1px solid red; background:yellow; } <style> <table> <tr> <td> <div id="leftPanel"> <asp:PlaceHolder runat="server" ID="TreeView" /> <%-- Here is a TreeView --%> </div> </td> </tr> <%-- other code --%> <table> $(function () { $('#leftPanel').resizable( { handles: 'e, w' }); }); I can't reduce the size of my div less then the size of my TreeView. What code need I write to allow leftPanel to be less than the size of TreeView ? It is necessary if TreeView node's text too long.

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• help with css formatting on table and div

  - by kralco626

  I have the following html (i'm also using Jquery and JqueryUI) <div style="display:none; position:fixed; z-index:100;padding:0;margin:0" class="ui-state-highlight" id="Info"> <table cellpadding="0" cellspacing="0" style="padding:0;margin:0"> <tr style="padding:0;margin:0;"> <td><span class="ui-icon ui-icon-info"></span></td> <td width = "100%" style="padding:0;margin:0;"><div id = "InfoText"></div></td> <td><button style="width:25px;height:25px;margin:0;padding:0" id="closeInfo"></button></td> </tr> </table> </div> It procudes the following: See where i circled in red? I want to get rid of that yellow space under the button, but i can't figure out how... Thanks!

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• How to speed up drawing of scaled image? Audio playback chokes during window resize.

  - by Paperflyer

  I am writing an audio player for OSX. One view is a custom view that displays a waveform. The waveform is stored as a instance variable of type NSImage with an NSBitmapImageRep. The view also displays a progress indicator (a thick red line). Therefore, it is updated/redrawn every 30 milliseconds. Since it takes a rather long time to recalculate the image, I do that in a background thread after every window resize and update the displayed image once the new image is ready. In the meantime, the original image is scaled to fit the view like this: // The drawing rectangle is slightly smaller than the view, defined by // the two margins. NSRect drawingRect; drawingRect.origin = NSMakePoint(sideEdgeMarginWidth, topEdgeMarginHeight); drawingRect.size = NSMakeSize([self bounds].size.width-2*sideEdgeMarginWidth, [self bounds].size.height-2*topEdgeMarginHeight); [waveform drawInRect:drawingRect fromRect:NSZeroRect operation:NSCompositeSourceOver fraction:1]; The view makes up the biggest part of the window. During live resize, audio starts choking. Selecting the "big" graphic card on my Macbook Pro makes it less bad, but not by much. CPU utilization is somewhere around 20-40% during live resizes. Instruments suggests that rescaling/redrawing of the image is the problem. Once I stop resizing the window, CPU utilization goes down and audio stops glitching. I already tried to disable image interpolation to speed up the drawing like this: [[NSGraphicsContext currentContext] setImageInterpolation:NSImageInterpolationNone]; That helps, but audio still chokes during live resizes. Do you have an idea how to improve this? The main thing is to prevent the audio from choking.

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• Can I modify the way Windows draws the Aero UI?

  - by LonelyPixel

  Windows 7 with Aero Glass basically looks quite nice I think. But it has some major drawbacks regarding readability: I cannot easily tell whether a window is currently active or not. I've been tweaking the colours and transparency levels a lot recently but the only safe indicator is the close button: it's red when the window is active, it's colourless otherwise. Then there's the window title text. It is always painted black, on however dark a background. Again, regardless of whether the window is active or not. I've seen WindowBlinds and the tons of available themes you can use with it. Browsing through the most popular or highest rated in several categories I was really scared. I don't want to face Terminator every day, feel like in the Jungle or be fooled that I had an Apple computer which I do not. All I want to change is to make a greater colour difference between active and inactive windows and to invert the window title text colour for dark backgrounds. (Including that visibility hack of a spray brush background.) Is there some Windows API to alter the way Windows draws its windows or does it take the years of private research from Stardock to hook into that? I mean they say it's approved by Microsoft, so I assume there's some official documentation for that, I just couldn't find any.

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• Web UI element to represent two different micro-views of data in the same spot?

  - by Chris McCall

  I've been tasked with laying out a portion of a screen for a customer care (call center) app that serves as sort of a header/summary block at the top of the screen. Here's what it looks like: The important part is in the red box. That little tooltip is the biz's vision for how to represent both the numeric SiteId and the textual Site Name all in the same piece of screen real estate. I asked, and the business thinks the Name is more important than the ID, but lists the Id by default, because the Name can't be truncated in the display, and there's only so much horizontal room to put the data. So they go with the Id, because it's fewer characters, and then they have the user mouse-over the Id to display the name (presumably because the tooltip can be of unlimited width and since it's floating over the rest of the screen, the full name will always be displayed. So, here's my question: Is there some better UI metaphor that I don't know about that could get this job done, while meeting the following constraints?: Does not require the mouse (uses a keyboard shortcut to do the "reveal") Allows the user to copy and paste the name Will not truncate the name Provides for the display of both the ID and name in the same spot Works with IE7

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• How to make this JavaScript much faster?

  - by Ralph

  Still trying to answer this question, and I think I finally found a solution, but it runs too slow. var $div = $('<div>') .css({ 'border': '1px solid red', 'position': 'absolute', 'z-index': '65535' }) .appendTo('body'); $('body *').live('mousemove', function(e) { var topElement = null; $('body *').each(function() { if(this == $div[0]) return true; var $elem = $(this); var pos = $elem.offset(); var width = $elem.width(); var height = $elem.height(); if(e.pageX > pos.left && e.pageY > pos.top && e.pageX < (pos.left + width) && e.pageY < (pos.top + height)) { var zIndex = document.defaultView.getComputedStyle(this, null).getPropertyValue('z-index'); if(zIndex == 'auto') zIndex = $elem.parents().length; if(topElement == null || zIndex > topElement.zIndex) { topElement = { 'node': $elem, 'zIndex': zIndex }; } } }); if(topElement != null ) { var $elem = topElement.node; $div.offset($elem.offset()).width($elem.width()).height($elem.height()); } }); It basically loops through all the elements on the page and finds the top-most element beneath the cursor. Is there maybe some way I could use a quad-tree or something and segment the page so the loop runs faster?

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• Close modal window

  - by Eyal

  I have page with products. When adding a product to the shopping cart a modal window is fired up for confirmation - this can take up to 2 seconds. I want to show another modal window just before the confirmation modal to show "loading..." my problem is that I don't know how to close the "loading..." modal. This the code which fired up the confirmation modal: $(document).ready(function () { var $dialog = $('<div style="background-color:red"></div>') .html('<h1>loading...</h1>') .dialog({ autoOpen: false, title: 'loading...' }); $('.AddToCartButton').click(function () { $dialog.dialog('open'); }); }); On the 'confirmation' modal I am trying to close the the 'loading..." modal with this code: <script type="text/javascript"> $('#AddToCartButton').dialog('close'); </script> Please help. Thanks.

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• Swing Menu dimensions

  - by ikurtz

  Greetings. I am trying to learn Java and Swing (today is my first day). I have been able to set up a menu in my test application. but the items occupy very little space (they are narrow). How do I go about extendng the amount of space it uses? I am studying Teach Yourself Java 6 in 21 Days 5th Ed, Java Swing, 2nd Edition, 2002 and Teach Yourself Programming With Java In 24 Hours, 4th Edition (2005) but none of them shed any light on this issue. EDIT: Menu code: JMenu _Game = new JMenu("Game"); JMenuItem _New = new JMenuItem("New"); JMenuItem _Exit = new JMenuItem("Exit"); JMenu _Turn = new JMenu("Turn"); JMenuItem _Red = new JMenuItem("Red"); JMenuItem _Yellow = new JMenuItem("Yellow"); _Turn.add(_Red); _Turn.add(_Yellow); _Game.add(_New); _Game.addSeparator(); _Game.add(_Turn); _Game.addSeparator(); _Game.add(_Exit); JMenu _Help = new JMenu("Help"); JMenuItem _About = new JMenuItem("About"); _Help.add(_About); JMenuBar _MenuBar = new JMenuBar(); _MenuBar.add(_Game); _MenuBar.add(_Help); setJMenuBar(_MenuBar); EDIT: Solved! JMenuItem _New = new JMenuItem("New "); just add spaces as needed! simple.

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• Getting rejected value null spring validation

  - by Shabarinath

  Hi in my project when I am trying to validate my form its not showing any error messages even if validation fails (Event Form is not submitted and enters into validation fail block) Here is my code /****************** Post Method *************/ @RequestMapping(value="/property", method = RequestMethod.POST) public String saveOrUpdateProperty(@ModelAttribute("property") Property property, BindingResult result, Model model, HttpServletRequest request) throws Exception { try { if(validateFormData(property, result)) { model.addAttribute("property", new Property()); return "property/postProperty"; } } /********* Validate Block *************/ private boolean validateFormData(Property property, BindingResult result) throws DaoException { if (property.getPropertyType() == null || property.getPropertyType().equals("")) { result.rejectValue("propertyType", "Cannot Be Empty !", "Cannot Be Empty !"); } if (property.getTitle() == null || property.getTitle().equals("")) { result.rejectValue("title", "Cannot Be Empty !", "Cannot Be Empty !"); } return (result.hasFieldErrors() || result.hasErrors()); } But when i debug i can see below one org.springframework.validation.BeanPropertyBindingResult: 1 errors Field error in object 'property' on field 'title': rejected value [null]; codes [Cannot Be Empty !.property.title,Cannot Be Empty !.title,Cannot Be Empty !.java.lang.String,Cannot Be Empty !]; arguments []; default message [Cannot Be Empty !] and this is how i am displaying in jsp file <div class="control-group"> <div class="controls"> <label class="control-label"><span class="required">* </span>Property Type</label> <div class="controls"> <form:input path="title" placeholder="Pin Code" cssClass="form-control border-radius-4 textField"/> <form:errors path="title" style="color:red;"/> </div> </div> </div> Event though when i see the below one when i debug (1 Error its correct) org.springframework.validation.BeanPropertyBindingResult: 1 errors Why it is not displayed in jsp can any one hep me?

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• style ul with width to accommodate items

  - by Tallmaris

  Sorry I could not find a similar answer on SO. I have the following markup (generated by jquery ui autocomplete but this is not the issue here) <ul style="z-index: 1; display: block; border: thin solid red; width: 200px;"> <li> <a> <div style="font-size: 0.85em;"> <span style="float: right; padding-left: 10px; color: gray;"> United Kingdom </span> <span style="">text text text text text</span> </div> </a> </li> </ul> As you can see in this fiddle: http://jsfiddle.net/fVr8P/2/ the text wraps because the width is limited and the country span is "floating". What I would like would be for the width to enlarge to accommodate the full length, but if I put width: auto; it will expand to 100%. Background The ul is of course coming from jquery ui autocomplete. I am styling the results a bit using the autocomplete.html extension. Problem is that everything is working ok in firefox an chrome because the autocomplete is set to the correct width on creation. in IE this does not happen (width is too small) so the text wraps. I am hping to come to a simple css only solution, without fiddling around in jQuery.

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• Strategy for animation a lot of LED's - thread?, UIView animations? NSOperation? (iPhone)

  - by RickiG

  Hi I have to do some different views containing 72 LED lights. I built an LED Class so I can loop through the LED's and set them to different colors (Green, Red, Orange, Blue None etc.). The LED then loads the appropriate .png. This works fine, I loop over the LED's and set them. Now I know that at some time they will need to not just turn on/off change color, but will have to turn on with a small delay. Like an equalizer. I have a 5-10 views containing the 72 LED's and I would like to achieve the above with the minimum amount of memory/CPU strain. for(LED *l in self.ledArray) { [l display:Green]; } I simply loop as shown above and inside the LED is a switch case that does the correct logic. If this were actual LED's and a microController I would use sleep(100) or similar in the loop, but I would really like to avoid stuff like that for obvious reasons. I was thinking that doing a performOnThread withDelay would really be consuming, so would UIView animation changing the alpha and NSOperation would also be a lot of lifting for a small feature. Is there a both efficient and clever way to go around this? Thanks for any inspiration given:)

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• Slowing process creation under Java?

  - by oconnor0

  I have a single, large heap (up to 240GB, though in the 20-40GB range for most of this phase of execution) JVM [1] running under Linux [2] on a server with 24 cores. We have tens of thousands of objects that have to be processed by an external executable & then load the data created by those executables back into the JVM. Each executable produces about half a megabyte of data (on disk) that when read right in, after the process finishes, is, of course, larger. Our first implementation was to have each executable handle only a single object. This involved the spawning of twice as many executables as we had objects (since we called a shell script that called the executable). Our CPU utilization would start off high, but not necessarily 100%, and slowly worsen. As we began measuring to see what was happening we noticed that the process creation time [3] continually slows. While starting at sub-second times it would eventually grow to take a minute or more. The actual processing done by the executable usually takes less than 10 seconds. Next we changed the executable to take a list of objects to process in an attempt to reduce the number of processes created. With batch sizes of a few hundred (~1% of our current sample size), the process creation times start out around 2 seconds & grow to around 5-6 seconds. Basically, why is it taking so long to create these processes as execution continues? [1] Oracle JDK 1.6.0_22 [2] Red Hat Enterprise Linux Advanced Platform 5.3, Linux kernel 2.6.18-194.26.1.el5 #1 SMP [3] Creation of the ProcessBuilder object, redirecting the error stream, and starting it.

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• Layering Images & Click to Choose Using Javascript

  - by rneal

  So I'm making a gallery of fabrics and backgrounds for letters for a fraternity/sorority store in my college's town. If you don't know what I'm talking about, this is a fabric letter. You can see how it has a white outline (background) and a red inside (foreground). WELL, I want to make it so you can change both the foreground and background, simply by clicking it's similar image. This is what I have so far <script type="text/javascript">// <![CDATA[ function changeImage(filename) { document.mainimage.src = filename; }// ]]></script> with these for each fabrics: <a href="javascript:changeImage('/wp-content/themes/collegiateconnectionbg/images/fabrics/foregrounds/37.jpg')"> <img src="/wp-content/themes/collegiateconnectionbg/images/fabrics/foregrounds/37.jpg" alt="" width="100px" height="50px" /></a> I really like how this works, but it's only good for one layer. Is there anyway I can add a layer below it, but still make it show at the top of the page? I know I'll have to use photoshop and transparency for both options, thats no problem, but I wanted to make sure I can do this before I start creating 600+ images. I know I can play with z-index and css, but since I'm using wordpress the one example I read about here wasn't working or I didn't completely understand it, and messed up my entire page. Also here's my tester webpage to see the current code in work. (if you click the navy&white stars image, you can see a very rough makeshift "A") Thanks in advance!

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