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  • Partial recalculation of visibility on a 2D uniform grid

    - by Martin Källman
    Problem Imagine that we have a 2D uniform grid of dimensions N x N. For this grid we have also pre-computed a visibility look-up table, e.g. with DDA, which answers the boolean query is cell X visible from cell Y? The look-up table is a complete graph KN of the cells V in the grid, with each edge E being a binary value denoting the visibility between its vertices. Question If any given cell has its visibility modified, is it possible to extract the subset Edelta of edges which must have their visibility recomputed due to the change, so as to avoid a full-on recomputation for the entire grid? (Which is N(N-1) / 2 or N2 depending on the implementation) Update If is not possible to solve thi in closed form, then maintaining a separate mapping of each cell and every cell pair who's line intersects said cell might also be an option. This obviously consumes more memory, but the data is static. The increased memory requirement could be reduced by introducing a hierarchy, subdividing the grid into smaller parts, and by doing so the above mapping can be reused for each sub-grid. This would come at a cost in terms of increased computation relative to the number of subdivisions; also requiring a resumable ray-casting algorithm.

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  • Need theoretical help, how to comprehend an if-else dependency net

    - by macbie
    I am going to face a following issue: I'm writing a program that manages some properties, some of them are general and some are specific. Each property is a pair of key and value, and for example: if it is given a general property and other specific property with exactly the same key and value has been existed before then the general property will swap the specific one in the register. If there are two the same general properties - both will remain in the register. And so on; it is like a net of dependencies. In my case I can handle with it intuitively and foresee all cases, but only because the system is not too vast. What if it would? I have met such problems a few times in many different programs and languages (i.e working with C semaphores) and my question is: How to approach this kind of problem? Is this connected with finite state machine, graph theory or something similar? How to be sure that I have considered the whole system and each possible case? Could you recommend some resources (books, sites) to learn from?

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  • Customizing the processing of ListItems for asp:RadioButtonList with "Flow" layout and "Horizontal"

    - by evovision
    Hi, recently I was asked to add an ability to pad specific elements from each other to a certain distance in RadioButtonList control. Not quite common everyday task I would say :)   Ok, let's get started!   Prerequisites: ASP.NET Page having RadioButtonList control with RepeatLayout="Flow" RepeatDirection="Horizontal" properties set.   Implementation:  The underlying data was coming from another source, so the only fast way to add meta information about padding was the text value itself (yes, not very optimal solution): Id = 1, Name = "This is first element" and for padding we agreed to use <space/> meta tag: Id = 2, Name = "<space padcount="30px"/>This is second padded element"   To handle items rendering in RadioButtonList control I've created custom class and subclassed from it:    public class CustomRadioButtonList : RadioButtonList    {        private Action<ListItem, HtmlTextWriter> _preProcess;         protected override void RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer)        {            if (_preProcess != null)            {                _preProcess(this.Items[repeatIndex], writer);            }             base.RenderItem(itemType, repeatIndex, repeatInfo, writer);        }         public void SetPrePrenderItemFunction(Action<ListItem, HtmlTextWriter> func)        {            _preProcess = func;        }    }   It is pretty straightforward approach, the key is to override RenderItem method. Class has SetPrePrenderItemFunction method which is used to pass custom processing function that takes 2 parameters: ListItem and HtmlTextWriter objects.   Now update existing RadioButtonList control in Default.aspx: add this to beginning of the page:   <%@ Register Namespace="Sample.Controls" TagPrefix="uc1" %>   and update the control to:   <uc1:CustomRadioButtonList ID="customRbl" runat="server" DataValueField="Id" DataTextField="Name"            RepeatLayout="Flow" RepeatDirection="Horizontal"></uc1:CustomRadioButtonList>   Now, from codebehind of the page:   Add regular expression that will be used for parsing:   private Regex _regex = new Regex(@"(?:[<]space padcount\s*?=\s*?(?:'|"")(?<padcount>\d+)(?:(?:\s+)?px)?(?:'|"")\s*?/>)(?<content>.*)?", RegexOptions.IgnoreCase | RegexOptions.Compiled);   and finally setup the processing function in Page_Load:   protected void Page_Load(object sender, EventArgs e)    {        customRbl.DataSource = DataObjects;         customRbl.SetPrePrenderItemFunction((listItem, writer) =>        {            Match match = _regex.Match(listItem.Text);            if (match.Success)            {                writer.Write(string.Format(@"<span style=""padding-left:{0}"">Extreme values: </span>", match.Groups["padcount"].Value + "px"));                 // if you need to pad listitem use code below                //x.Attributes.CssStyle.Add("padding-left", match.Groups["padcount"].Value + "px");                 // remove meta tag from text                listItem.Text = match.Groups["content"].Value;            }        });         customRbl.DataBind();    }   That's it! :)   Run the attached sample application:     P.S.: of course several other approaches could have been used for that purpose including events and the functionality for processing could also be embedded inside control itself. Current solution suits slightly better due some other reasons for situation where it was used, in your case consider this as a kick start for your own implementation :)   Source application: CustomRadioButtonList.zip

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  • 10 CSS Grid Layout Generators

    - by Jyoti
    There are a lot of online generators which are of no use to any designers, however some can help designers to an extent. Some example of online generators are favicon generators, background generators, button generators, and badge generators. Some of the useful kinds are the ones that solve one purpose with quick and easy steps, [...]

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  • Silverlight layout hack: Centered content with fixed maxwidth

    - by brainbox
     Today we need to create centered content with fixed maxwidth. It is very easy to implement it for fixed width, but is not clear how to achieve the same for maxwidth.The solution to the problem is Grid with 3 columns: <Grid>      <Grid.ColumnDefenitions>            <ColumnDefenition Width="0.01*" />             <ColumnDefenition Width="0.98*" MaxWidth="1280" />            <ColumnDefenition Width="0.01*" />      </Grid.ColumnDefenitions> </Grid>Huh... like html coding xaml coding is still full of dirty tricks =)

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  • Tweak Conky Layout via a script

    - by begtognen
    I'm using a script in Conky in order to display my new gmail on my desktop. It works beautifully, but is kind of ugly, and I'm not sure how to fix it. What I've currently got looks like this: And what I'd like is this: Any ideas for how to make that happen are much appreciated. Here's the script I'm currently using (I think I've snipped out the correct part, if I haven't please let me know.) #!/usr/bin/perl use Switch; use Text::Wrap; my $what=$ARGV[0]; $user="username"; #username for gmail account $pass="password"; #password for gmail account $file="/tmp/gmail.html"; #temporary file to store gmail #wrap format for subject $Text::Wrap::columns=65; #Number of columns to wrap subject at $initial_tab=""; #Tab for first line of subject $subsequent_tab="\t"; #tab for wrapped lines $quote="\""; #put quotes around subject #limit the number of emails to be displayed $emails=-1; #if -1 display all emails &passwd; #give password the proper url character encoding switch($what){ #determine what the user wants case "n" {&gmail; print "$new\n";} #print number of new emails case "s" { #print $from and $subj for new email &gmail; if ($new0){ my $size=@from; if ($emails!=-1 && $size$emails){$size=$emails;} #limit number of emails displayed for(my $i=0; $i$emails){print "$emails out of $size new emails displayed\n";} } } case "e" { #print number of new emails, $from, and $subj &gmail; if($new==0){print "You have no new emails.\n";} else{ print "You have $new new email(s).\n"; my $size=@from; if ($emails!=-1 && $size$emails){$size=$emails;} #limit number of emails displayed for(my $i=0; $i$emails){print "$emails out of $size new emails displayed\n";} } } else { print "Usage Error: gmail.pl \n"; print "\tn displays number of new emails\n"; print "\ts displays from line and subject line for each new email.\n"; print "\te displays the number of new emails and from line plus \n"; print "\t\tsubject line for each new email.\n"; } #didn't give proper option } sub gmail{ if(!(-e $file)){ #create file if it does not exists `touch $file`; } #get new emails `wget -O - https://$user:$pass\@mail.google.com/mail/feed/atom --no-check-certificate $file`; open(IN, $file); #open $file my $i=0; #initialize count $new=0; #initialize new emails to 0 my $flag=0; while(){ #cycle through $file if(//){$flag=1;} elsif(/(\d+)/){$new=$1;} #grab number of new emails elsif($flag==1){ if(/.+/){push(@subj, &msg);} #grab new email titles elsif(/(.+)/){push(@from, $1); $flag=0;} #grab new email from lines } } close(IN); #close $file } sub passwd{ #change to url escape codes in password #URL ESCAPE CODES $_=$pass; s/\%/\%25/g; s/\#/\%23/g; s/\$/\%24/g; s/\&/\%26/g; s/\//\%2F/g; s/\:/\%3A/g; s/\;/\%3B/g; s/\/\%3E/g; s/\?/\%3F/g; s/\@/\%40/g; s/\[/\%5B/g; s/\\/\%5C/g; s/\]/\%5D/g; s/\^/\%5E/g; s/\`/\%60/g; s/\{/\%7B/g; s/\|/\%7C/g; s/\}/\%7D/g; s/\~/\%7E/g; $pass=$_; } sub msg{ #THE HTML CODED CHARACTER SET [ISO-8859-1] chomp; s/(.+)/$1/; #get just the subject #now replace any special characters s/\&\#33\;/!/g; #Exclamation mark s/\&\#34\;/"/g; s/\"\;/"/g; #Quotation mark s/\&\#35\;/#/g; #Number sign s/\&\#36\;/\$/g; #Dollar sign s/\&\#37\;/%/g; #Percent sign s/\&\#38\;/&/g; s/\&\;/&/g; #Ampersand s/\&\#39\;/'/g; #Apostrophe s/\&\#40\;/(/g; #Left parenthesis s/\&\#41\;/)/g; #Right parenthesis s/\&\#42\;/*/g; #Asterisk s/\&\#43\;/+/g; #Plus sign s/\&\#44\;/,/g; #Comma s/\&\#45\;/-/g; #Hyphen s/\&\#46\;/./g; #Period (fullstop) s/\&\#47\;/\//g; #Solidus (slash) s/\&\#58\;/:/g; #Colon s/\&\#59\;/\;/g; #Semi-colon s/\&\#60\;//g; s/\>\;//g; #Greater than s/\&\#63\;/\?/g; #Question mark s/\&\#64\;/\@/g; #Commercial at s/\&\#91\;/\[/g; #Left square bracket s/\&\#92\;/\\/g; #Reverse solidus (backslash) s/\&\#93\;/\]/g; #Right square bracket s/\&\#94\;/\^/g; #Caret s/\&\#95\;/_/g; #Horizontal bar (underscore) s/\&\#96\;/\`/g; #Acute accent s/\&\#123\;/\{/g; #Left curly brace s/\&\#124\;/|/g; #Vertical bar s/\&\#125\;/\}/g; #Right curly brace s/\&\#126\;/~/g; #Tilde s/\&\#161\;/¡/g; #Inverted exclamation s/\&\#162\;/¢/g; #Cent sign s/\&\#163\;/£/g; #Pound sterling s/\&\#164\;/¤/g; #General currency sign s/\&\#165\;/¥/g; #Yen sign s/\&\#166\;/¦/g; #Broken vertical bar s/\&\#167\;/§/g; #Section sign s/\&\#168\;/¨/g; #Umlaut (dieresis) s/\&\#169\;/©/g; s/\©\;/©/g; #Copyright s/\&\#170\;/ª/g; #Feminine ordinal s/\&\#171\;/«/g; #Left angle quote, guillemotleft s/\&\#172\;/¬/g; #Not sign s/\&\#174\;/®/g; #Registered trademark s/\&\#175\;/¯/g; #Macron accent s/\&\#176\;/°/g; #Degree sign s/\&\#177\;/±/g; #Plus or minus s/\&\#178\;/²/g; #Superscript two s/\&\#179\;/³/g; #Superscript three s/\&\#180\;/´/g; #Acute accent s/\&\#181\;/µ/g; #Micro sign s/\&\#182\;/¶/g; #Paragraph sign s/\&\#183\;/·/g; #Middle dot s/\&\#184\;/¸/g; #Cedilla s/\&\#185\;/¹/g; #Superscript one s/\&\#186\;/º/g; #Masculine ordinal s/\&\#187\;/»/g; #Right angle quote, guillemotright s/\&\#188\;/¼/g; s/\¼\;/¼/g; # Fraction one-fourth s/\&\#189\;/½/g; s/\½\;/½/g; # Fraction one-half s/\&\#190\;/¾/g; s/\¾\;/¾/g; # Fraction three-fourths s/\&\#191\;/¿/g; #Inverted question mark s/\&\#192\;/À/g; #Capital A, grave accent s/\&\#193\;/Á/g; #Capital A, acute accent s/\&\#194\;/Â/g; #Capital A, circumflex accent s/\&\#195\;/Ã/g; #Capital A, tilde s/\&\#196\;/Ä/g; #Capital A, dieresis or umlaut mark s/\&\#197\;/Å/g; #Capital A, ring s/\&\#198\;/Æ/g; #Capital AE dipthong (ligature) s/\&\#199\;/Ç/g; #Capital C, cedilla s/\&\#200\;/È/g; #Capital E, grave accent s/\&\#201\;/É/g; #Capital E, acute accent s/\&\#202\;/Ê/g; #Capital E, circumflex accent s/\&\#203\;/Ë/g; #Capital E, dieresis or umlaut mark s/\&\#204\;/Ì/g; #Capital I, grave accent s/\&\#205\;/Í/g; #Capital I, acute accent s/\&\#206\;/Î/g; #Capital I, circumflex accent s/\&\#207\;/Ï/g; #Capital I, dieresis or umlaut mark s/\&\#208\;/Ð/g; #Capital Eth, Icelandic s/\&\#209\;/Ñ/g; #Capital N, tilde s/\&\#210\;/Ò/g; #Capital O, grave accent s/\&\#211\;/Ó/g; #Capital O, acute accent s/\&\#212\;/Ô/g; #Capital O, circumflex accent s/\&\#213\;/Õ/g; #Capital O, tilde s/\&\#214\;/Ö/g; #Capital O, dieresis or umlaut mark s/\&\#215\;/×/g; #Multiply sign s/\&\#216\;/Ø/g; #Capital O, slash s/\&\#217\;/Ù/g; #Capital U, grave accent s/\&\#218\;/Ú/g; #Capital U, acute accent s/\&\#219\;/Û/g; #Capital U, circumflex accent s/\&\#220\;/Ü/g; #Capital U, dieresis or umlaut mark s/\&\#221\;/Ý/g; #Capital Y, acute accent s/\&\#222\;/Þ/g; #Capital THORN, Icelandic s/\&\#223\;/ß/g; #Small sharp s, German (sz ligature) s/\&\#224\;/à/g; #Small a, grave accent s/\&\#225\;/á/g; #Small a, acute accent s/\&\#226\;/â/g; #Small a, circumflex accent s/\&\#227\;/ã/g; #Small a, tilde s/\&\#228\;/ä/g; #Small a, dieresis or umlaut mark s/\&\#229\;/å/g; #Small a, ring s/\&\#230\;/æ/g; #Small ae dipthong (ligature) s/\&\#231\;/ç/g; #Small c, cedilla s/\&\#232\;/è/g; #Small e, grave accent s/\&\#233\;/é/g; #Small e, acute accent s/\&\#234\;/ê/g; #Small e, circumflex accent s/\&\#235\;/ë/g; #Small e, dieresis or umlaut mark s/\&\#236\;/ì/g; #Small i, grave accent s/\&\#237\;/í/g; #Small i, acute accent s/\&\#238\;/î/g; #Small i, circumflex accent s/\&\#239\;/ï/g; #Small i, dieresis or umlaut mark s/\&\#240\;/ð/g; #Small eth, Icelandic s/\&\#241\;/ñ/g; #Small n, tilde s/\&\#242\;/ò/g; #Small o, grave accent s/\&\#243\;/ó/g; #Small o, acute accent s/\&\#244\;/ô/g; #Small o, circumflex accent s/\&\#245\;/õ/g; #Small o, tilde s/\&\#246\;/ö/g; #Small o, dieresis or umlaut mark s/\&\#247\;/÷/g; #Division sign s/\&\#248\;/ø/g; #Small o, slash s/\&\#249\;/ù/g; #Small u, grave accent s/\&\#250\;/ú/g; #Small u, acute accent s/\&\#251\;/û/g; #Small u, circumflex accent s/\&\#252\;/ü/g; #Small u, dieresis or umlaut mark s/\&\#253\;/ý/g; #Small y, acute accent s/\&\#254\;/þ/g; #Small thorn, Icelandic s/\&\#255\;/ÿ/g; #Small y, dieresis or umlaut mark s/^\s+//; return $_; }

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  • Magento CSS Merge breaks layout in IE browsers

    - by Subi
    I am developing a magento website, and it is using CSS merge option. currently in IE the CSS not rendering properly. When I remove some part of CSS file its working. Some times it works when I remove 50 line from top. Some times it works when I remove 100 lines from bottom. So it's nothing related to the CSS I wrote. Merged file contains about 6000 lines and having 380 KB file size. can anybody help me on this ? Thanks

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  • Best approach for a flexible layout for ASP.NET application

    - by Rohith Nair
    I am looking for a best approach for designing a dynamic page. I want my users to be able to determine the position of set of controls to be loaded into a page. Should be able to add new controls or swap in and out new controls into an existing page. Eg: Portal based applications,iGoogle kind of websites I am afraid that I will be re-inventing the wheel if I go and create a portal structure for my web application. There are a couple of things in my mind to look into: Good third-party suites which can do the same Should I look into Silverlight RIA application? I have researched about the Infragistics and Telerik controls and the price is high for just a control like LayoutManager which I need. Any alternatives? What is the best approach for this kind of situation, to add to the list?

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  • Website URL layout & structure for SEO & PR

    - by Junaid Saeed
    i have already mastered the skills of building a page to comply with SEO requirements. What i want to do is customize the URL based parameters for best SEO & PR. I run wallpapers blog wallz which provides different resolution desktop wallpapers I am thinking about expanding the site to provide wallpapers for multiple devices like iphone, android, pc etc etc My goal is to provide users ease by detecting their devices and directing them to the relative portion of site, keeping that in mind also keep my URLs in a SEO friendly manner. i have the following two options for my URL structure wallpapers.com \ iphone \ **or** iphone . wallpapers . com wallpapers.com \ galaxyS3 \ **or** galaxys3 . wallpapers . com subdomain or subfolders, which one is a better option, i will separate interfaces for ever subdomain\subfolder basing on the specific device. And after this the URL structure will be like wallpapers.com \ galaxyS3 \ Cars \ Ferrai 550 . html galaxys3.wallpapers.com \ Cars \ Ferrai 550 . html what is the better way for me to proceed in

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  • Big project layout : adding new feature on multiple sub-projects

    - by Shiplu
    I want to know how to manage a big project with many components with version control management system. In my current project there are 4 major parts. Web Server Admin console Platform. The web and server part uses 2 libraries that I wrote. In total there are 5 git repositories and 1 mercurial repository. The project build script is in Platform repository. It automates the whole building process. The problem is when I add a new feature that affects multiple components I have to create branch for each of the affected repo. Implement the feature. Merge it back. My gut feeling is "something is wrong". So should I create a single repo and put all the components there? I think branching will be easier in that case. Or I just do what I am doing right now. In that case how do I solve this problem of creating branch on each repository?

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  • VS 2010: New Add Reference dialog, tab layout and options

    - by Fabrice Marguerie
    Microsoft has just published a new free extension for Visual Studio 2010 that provides an improved Add Reference dialog, an improved tab bar, and much more.The new Add Reference dialog comes with a long-awaited feature: it's now searchable!The tab bar allows you to display the close button at the end of the bar and not on each tab. It can also sort tabs by project and alphabetically. Tab color can vary by project or according to regular expressions.I'll let you discover about the other features by yourself (HTML Copy, Triple Click, Current Line Highlighting, etc.).The name of the extension is Visual Studio Pro Power Tools. I believe it's main features will come out-of-the-box with the next version of Visual Studio.

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  • VS 2010: New Add Reference dialog, tab layout and options

    Microsoft has just published a new free extension for Visual Studio 2010 that provides an improved Add Reference dialog, an improved tab bar, and much more.The new Add Reference dialog comes with a long-awaited feature: it's now searchable!The tab bar allows you to display the close button at the end of the bar and not on each tab. It can also sort tabs by project and alphabetically. Tab color can vary by project or according to regular expressions.I'll let you discover about the other features by...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Efficient mapping layout in 2D side-scroller, and collisions between character and the world

    - by Jack
    I haven't touched Visual Studio for a couple months now, but I was playing a game from the '90s toady and had an epiphany: I was looking for something what i didn't need, and I wasn't using what I knew correctly. One of those realizations was collision, so let me tell you a bit about my project that I was working on. The project's graphics looks like Mario or Dangerous Dave, etc., you get the idea - old-school pixels. So anyway I remember trying to think of something else than AABB for character form, but I couldn't think of anything. Perhaps I could get a suggestion for this? Another thing is the world - I don't want it to be just linear world, I want mountains, etc.. My idea is to use triangles, and no idea yet what to do if I want just part of the cube, say 3/4 or 2/4 or whatever. Hard-coding such things seems inefficient. P.S. I am not looking at the precision level offered by Box2D. Actually I remember trying to implement it at first, but I failed as my understanding of C++ wasn't advanced enough, as it'll be mentioned below. P.P.S. I am programming in C++, and I haven't done it for a couple months now. I have no means of testing it either, as my PC is broken down, and this one can barely run games from late '90s, not to speak about a compiler or a program with inefficient resource management... I am also not an expert (obviously), I don't even know if I can consider myself an average programmer. In short, I am simply curious about my thoughts and my past experience when programming the game. I may come back to it when my PC is fixed, I'm already filling a note about these things.

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  • Changing the RSS and Dynamic Views layout when using Blogger as a Podcast index

    - by Stuart
    I'm trying to set up a podcast service at present. This is just a 'spare time' task - so I wanted a quick, easy way to do it. To get this working: I've ripped (with owner permission) some YouTube content across to MP3 and hosted this content on Azure Blob Storage. I've posted blog posts - with linked mp3 content - inside a Blogger website. I've registered the RSS feed with iTunes This all seems to be working OK - http://dotnetmobilepodcast.blogspot.co.uk/ However, when it comes to a couple of final touches, then I'm hitting problems. RSS I would like to add iTunes metadata to the RSS feed. However, I can't find any way to do this inside the Blogger system. To workaround this I've tried using FeedBurner with its StreamCast plugin. However, the output from FeedBurner doesn't seem to be accepted by iTunes - e.g. http://feeds.feedburner.com/MobileAppCSharpPodcasts leads to this very unhelpful 11111 message: Is there any other way I can get this iTunes metadata content into the Blogger RSS feed - e.g. maybe an alternative service or a Yahoo! Pipe? Showing the MP3 files in the Blog I'm trying to work out how to automatically display the linked enclosures inside the blog posts - do the blogger Dynamic Views don't seem to have any way of doing this? I've found the HTML in those views very difficult to follow. If necessary I can workaround this using manual entries into each blog post... but I'd prefer to do this programatically if I can.

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  • Layout of mathematical views (iOS)

    - by William Jockusch
    I am trying to figure out the right way to encapsulate graphical information about mathematical objects. It is not simple. For example, a matrix can include square brackets around its entries, or not. Some things carry down to sub-objects -- for example, a matrix might track the font size to be used by its entries. Similarly, the font color and the background color would carry down to the entries. Other things do not carry down. For example, the entries of the matrix do not need to know whether or not the matrix has those square brackets. Based on all of the above, I need to calculate sizes for everything, then frames. All of this can depend on the properties stored above. The size of a matrix depends on the sizes of its entries, and also on whether or not it has those brackets. What I am having a hard time with is not the individual ways to calculate sensible frames for this or that. It is the overall organizational structure of the whole thing. How can I keep track of it all without going crazy. One particular obstacle is worth mentioning -- for reasons I don't want to go into here, I need to calculate the sizes and frames for everything before I instantiate any actual views. So, for example, if I have a Matrix object, I need to calculate its size before I make a MatrixView. If I have an equation, I need to calculate the size of the view for the equation before I create the actual view. So I clearly need separate objects for those calculations. But I can't figure out a sensible class structure for those objects. If I put them all into a single class, I get some advantages because copying then becomes easy. But I also end up with a bloated class that contains info that is irrelevant for some objects -- such as whether or not to include those brackets around the matrix. But if I use a lot of different classes, copying properties becomes a real pain. If it matters, this is all in Objective C, for an iOS environment. Any pointers would be greatly appreciated.

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  • How to layout application icons in the panel?

    - by Vincenzo
    Hello everybody, Application and applets icons are changing their position or even disappears from the gnome-panel (see an example). It often happens after connecting to external monitor with different resolution setting, or sometimes happens by chance (I don't know what is the reason of such behaviour). Some icons I can move, others I can't. I don't know if they're locked or not. My question is: Is there any settings/software for icon's position control in the panel? I noticed that locking does not resolve this issue. Thank you for support.

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  • Munin Aggregate Graphs from several servers

    - by Sparsh Gupta
    I am using DNS round robin load balancing and have divided my total traffic onto multiple servers. Each server does around 300-400req/second but I am interested in having an aggregate graph telling me the TOTAL of all requests per second served by our architecture. Is there any way I can do this. Right now each graph in Munin comes as a separate graph as they depict things on one server. I am using configuration as follow which doesn't work doesnt work for me, does this configuration got errors? [TRAFFIC.AGGREGATED] update no requests.graph_title nGinx requests requests.graph_vlabel nGinx requests per second requests.draw LINE2 requests.graph_args --base 1000 requests.graph_category nginx requests.label req/sec requests.type DERIVE requests.min 0 requests.graph_order output requests.output.sum \ lb1.visualwebsiteoptimizer.com:nginx_request_lb1.visualwebsiteoptimizer.com_request.request \ lb3.visualwebsiteoptimizer.com:nginx_request_lb2.visualwebsiteoptimizer.com_request.request \ lb3.visualwebsiteoptimizer.com:nginx_request_lb3.visualwebsiteoptimizer.com_request.request

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  • How to layout class definition when inheriting from multiple interfaces

    - by gabr
    Given two interface definitions ... IOmniWorkItem = interface ['{3CE2762F-B7A3-4490-BF22-2109C042EAD1}'] function GetData: TOmniValue; function GetResult: TOmniValue; function GetUniqueID: int64; procedure SetResult(const value: TOmniValue); // procedure Cancel; function DetachException: Exception; function FatalException: Exception; function IsCanceled: boolean; function IsExceptional: boolean; property Data: TOmniValue read GetData; property Result: TOmniValue read GetResult write SetResult; property UniqueID: int64 read GetUniqueID; end; IOmniWorkItemEx = interface ['{3B48D012-CF1C-4B47-A4A0-3072A9067A3E}'] function GetOnWorkItemDone: TOmniWorkItemDoneDelegate; function GetOnWorkItemDone_Asy: TOmniWorkItemDoneDelegate; procedure SetOnWorkItemDone(const Value: TOmniWorkItemDoneDelegate); procedure SetOnWorkItemDone_Asy(const Value: TOmniWorkItemDoneDelegate); // property OnWorkItemDone: TOmniWorkItemDoneDelegate read GetOnWorkItemDone write SetOnWorkItemDone; property OnWorkItemDone_Asy: TOmniWorkItemDoneDelegate read GetOnWorkItemDone_Asy write SetOnWorkItemDone_Asy; end; ... what are your ideas of laying out class declaration that inherits from both of them? My current idea (but I don't know if I'm happy with it): TOmniWorkItem = class(TInterfacedObject, IOmniWorkItem, IOmniWorkItemEx) strict private FData : TOmniValue; FOnWorkItemDone : TOmniWorkItemDoneDelegate; FOnWorkItemDone_Asy: TOmniWorkItemDoneDelegate; FResult : TOmniValue; FUniqueID : int64; strict protected procedure FreeException; protected //IOmniWorkItem function GetData: TOmniValue; function GetResult: TOmniValue; function GetUniqueID: int64; procedure SetResult(const value: TOmniValue); protected //IOmniWorkItemEx function GetOnWorkItemDone: TOmniWorkItemDoneDelegate; function GetOnWorkItemDone_Asy: TOmniWorkItemDoneDelegate; procedure SetOnWorkItemDone(const Value: TOmniWorkItemDoneDelegate); procedure SetOnWorkItemDone_Asy(const Value: TOmniWorkItemDoneDelegate); public constructor Create(const data: TOmniValue; uniqueID: int64); destructor Destroy; override; public //IOmniWorkItem procedure Cancel; function DetachException: Exception; function FatalException: Exception; function IsCanceled: boolean; function IsExceptional: boolean; property Data: TOmniValue read GetData; property Result: TOmniValue read GetResult write SetResult; property UniqueID: int64 read GetUniqueID; public //IOmniWorkItemEx property OnWorkItemDone: TOmniWorkItemDoneDelegate read GetOnWorkItemDone write SetOnWorkItemDone; property OnWorkItemDone_Asy: TOmniWorkItemDoneDelegate read GetOnWorkItemDone_Asy write SetOnWorkItemDone_Asy; end; As noted in answers, composition is a good approach for this example but I'm not sure it applies in all cases. Sometimes I'm using multiple inheritance just to split read and write access to some property into public (typically read-only) and private (typically write-only) part. Does composition still apply here? I'm not really sure as I would have to move the property in question out from the main class and I'm not sure that's the correct way to do it. Example: // public part of the interface interface IOmniWorkItemConfig = interface function OnExecute(const aTask: TOmniBackgroundWorkerDelegate): IOmniWorkItemConfig; function OnRequestDone(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; function OnRequestDone_Asy(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; end; // private part of the interface IOmniWorkItemConfigEx = interface ['{42CEC5CB-404F-4868-AE81-6A13AD7E3C6B}'] function GetOnExecute: TOmniBackgroundWorkerDelegate; function GetOnRequestDone: TOmniWorkItemDoneDelegate; function GetOnRequestDone_Asy: TOmniWorkItemDoneDelegate; end; // implementing class TOmniWorkItemConfig = class(TInterfacedObject, IOmniWorkItemConfig, IOmniWorkItemConfigEx) strict private FOnExecute : TOmniBackgroundWorkerDelegate; FOnRequestDone : TOmniWorkItemDoneDelegate; FOnRequestDone_Asy: TOmniWorkItemDoneDelegate; public constructor Create(defaults: IOmniWorkItemConfig = nil); public //IOmniWorkItemConfig function OnExecute(const aTask: TOmniBackgroundWorkerDelegate): IOmniWorkItemConfig; function OnRequestDone(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; function OnRequestDone_Asy(const aTask: TOmniWorkItemDoneDelegate): IOmniWorkItemConfig; public //IOmniWorkItemConfigEx function GetOnExecute: TOmniBackgroundWorkerDelegate; function GetOnRequestDone: TOmniWorkItemDoneDelegate; function GetOnRequestDone_Asy: TOmniWorkItemDoneDelegate; end;

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  • Dual-Monitor layout and primary display with Nvidia in Gnome-Shell

    - by java4fun
    I have installed Ubuntu 14.04.1 with gnome-shell version 3.10.4. I can attach a second monitor to my laptop and it is recognized. If I configure it with the nvidia-settings at the right of my laptop then all works fine (the extention of the display works as an extention on the right, not dual). Now what I want is to have the second monitor configured over the laptop-display. When I'm not using gnome-shell, it works correct (I can drag an application from the bottom display to the top normally) but with gnome-shell I have to press Ctrl+Shift+ mouse help, and resize properly the application size. This is for me an enforcing. Is there a way to make that gnome-shell work properly with a bottom/top monitor?

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  • How would the optimal Emacs-keyboard look like?

    - by Thorsten
    Emacs is a historic piece of software. It promises outstanding productivity for keyboard wizards that really want to explore it's power. The effective use of the keyboard is key to Emacs productivity, but the keyboard hardware has changed a lot since the old days, so many modern Emacs users are struggling with weird 'Emacs chords' on their Windows/IBM keyboards. If one would design a keyboard that is entirely focused on the needs of Emacs users - how would it look like? I assume the following: the standard keybindings of Emacs are accepted, redefinitions are rare exceptions we are only talking about QWERTY keyboards (including regional variations like QWERTZ) we are only considering users applying the (10 fingers) touch typing system. the question is not only about remapping the keys of existing keyboards (perfectly possible on Linux with .xmodmap and on Windows with keytweak, for example) - think about the perfect keyboard-hardware you would like to see on your desk while hacking in Emacs all day long. Please tag your answer with your locale, i.e. [en] or [de], so that everybody knows what regional layout you are using. I will answer my own question below, to show you the results of some investigation and experimentation, but I really would like to read about different approaches and their pro's and con's. The emacswiki has a somehow related page with a lot of links (http://www.emacswiki.org/emacs/RepeatedStrainInjury), but here it's about optimal keyboard design for maximal productivity, assuming avoidance of RSI as a byproduct.

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  • Diagnosing xmodmap errors

    - by intuited
    I'm getting this error when trying to use xmodmap to get rid of caps lock: $ xmodmap -e 'clear Lock' X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 118 (X_SetModifierMapping) Value in failed request: 0x17 Serial number of failed request: 8 Current serial number in output stream: 8 I'm running xfce on Maverick "10.10" Meercat. This problem did not occur before I added the Keyboard Layouts applet to a panel; before doing that, I was able to run my xmodmap script to swap Esc and CapsLock: !Remap Caps_Lock as Escape remove Lock = Caps_Lock keysym Caps_Lock = Escape It may be relevant that I chose alt-capslock as the keyboard switch combo in the Keyboard Layouts preferences. I've had a similar problem before, on a different machine, running openbox. On that machine, this problem started when I upgraded to Lucid, and has persisted in Maverick (release 10.10). I reported a bug in xorg. However, it remains unclear whether it's really a problem with xorg, or if I'm just doing something wrong with my configuration. Have other people experienced this problem? Can someone shed some light on what's going on here? It seems there are quite a few layers involved, and I don't understand any of them particularly well, so any information would be helpful. update I've discovered that the problem is specifically triggered by adding the Canada layout variant "Multilingual" (ca-multix). If I instead add the variant "Multilingual (first part)", the problem does not occur. I think this will probably end up being a usable workaround, but I don't yet know what the difference between these variants is. I've filed a freedesktop issue, and am commenting on a related ubuntu issue.

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  • Diagnosing xmodmap errors

    - by intuited
    I'm getting this error when trying to use xmodmap to get rid of caps lock: $ xmodmap -e 'clear Lock' X Error of failed request: BadValue (integer parameter out of range for operation) Major opcode of failed request: 118 (X_SetModifierMapping) Value in failed request: 0x17 Serial number of failed request: 8 Current serial number in output stream: 8 I'm running xfce on Maverick "10.10" Meercat. This problem did not occur before I added the Keyboard Layouts applet to a panel; before doing that, I was able to run my xmodmap script to swap Esc and CapsLock: !Remap Caps_Lock as Escape remove Lock = Caps_Lock keysym Caps_Lock = Escape It may be relevant that I chose alt-capslock as the keyboard switch combo in the Keyboard Layouts preferences. I've had a similar problem before, on a different machine, running openbox. On that machine, this problem started when I upgraded to Lucid, and has persisted in Maverick (release 10.10). I reported a bug in xorg. However, it remains unclear whether it's really a problem with xorg, or if I'm just doing something wrong with my configuration. Have other people experienced this problem? Can someone shed some light on what's going on here? It seems there are quite a few layers involved, and I don't understand any of them particularly well, so any information would be helpful. update I've discovered that the problem is specifically triggered by adding the Canada layout variant "Multilingual" (ca-multix). If I instead add the variant "Multilingual (first part)", the problem does not occur. I think this will probably end up being a usable workaround, but I don't yet know what the difference between these variants is. I've filed a freedesktop issue, and am commenting on a related ubuntu issue.

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  • How to change CapsLock key to produce "a"?

    - by Pit
    While typing I often hit the CapsLock key instead of the a key. (QWERTZU keyboard) This is quite annoying because the moment I realise that I hit the wrong key, I will have to delete multiple character/lines of text an rewrite them in the right form. I am searching for a way to prevent this. I have found a possibility to disable the CapsLock key in Keyboard Layout Options. But this would in my case mean that instead of writing an a I would write nothing. Positive - I don't have to rewrite a whole line, but only one character Negative - It's not that obvious that I hit the wrong key, as a missing character is not perceivable as an upper-case line of text. I would therefore prefer a possibility to map CapsLock to a . Thus when hitting CapsLock an a character would be written. Positive - If I hit CapsLock instead of a I get the output I actually wanted to type. Negative - If I hit CapsLock in any other context I will get an a character. As I don't ever intentionally use the CapsLock key this would not really pose a problem. (I think, or does it?) My Question: So how do I change to a ? And is there any case where this could be dangerous/provoke unwanted behaviour?

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  • WPF dynamic layout: how to enforce square proportions (width equals height)?

    - by Gart
    I'm learning WPF and can't figure out how to enfore my buttons to take a square shape. Here is my XAML Markup: <Window x:Class="Example" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="368" Width="333"> <Window.Resources> <Style x:Key="ToggleStyle" BasedOn="{StaticResource {x:Type ToggleButton}}" TargetType="{x:Type RadioButton}"> </Style> </Window.Resources> <RadioButton Style="{StaticResource ToggleStyle}"> Very very long text </RadioButton> </Window> Specifying explicit values for Width and Height attributes seems like a wrong idea - the button should calculate its dimensions based on its contents automagically, but keep its width and height equal. Is this possible?

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