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• image archive VS image strip

  - by DevA

  Hi, i've noticed that plenty of games / applications (very common on mobile builds) pack numerous images into an image strip. I figured that the advantages in this are making the program more tidy (file system - wise) and reducing (un)installation time. During the runtime of the application, the entire image strip is allocated and copied from FS to RAM. On the contrary, images can be stored in an image archive and unpacked during runtime to a number of image structures in RAM. The way I see it, the image strip approach is less efficient because of worse caching performance and because that even if the optimal rectangle packing algorithm is used, there will be empty spaces between the stored images in the strip, causing a waste of RAM. What are the advantages in using an image strip over using an image archive file?

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• How can I use data binding in WPF to create a new user control for each element in a list?

  - by Joel

  I have a list of objects. For each item in the list, I want to create a new user control bound to that item. From what I've read, doing this programmatically is bad practice with WPF (as well as less than straightforward), so I should use data binding as a solution instead. The problem is, I can't figure out how to do this. I don't know the contents of the list (just the type) at compile-time, so I can't create and bind with XAML for each element. Google and MSDN don't seem to have any answers, so maybe I'm thinking about this the wrong way? What do I need to do? Thanks

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• Why does Maven have such a bad rep?

  - by Dan

  There is a lot of talk on the internet about how Maven is bad. I have been using some features of Maven for a few years now and the most important benefit in my view is the dependency management. Maven documentation is less than adequate, but generally when I need to accomplish something I figure it once and than it works (for example, I remember when I implemented signing the jars.) I don’t think that Maven is great, but it does solve some problems that without it would be a genuine pain. So, why does Maven has such a bad rep and what problems with Maven can I expect in the future? Maybe there are much better alternatives that I don't know about? (For example, I never looked Ivy in detail.) NOTE: This is not an attempt to cause an argument. It is an attempt to clear the FUD.

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• Writing a rails validator with integer

  - by user297008

  I was trying to write a validation for Rails to ensure that a price entered on a form was greater than zero. It works…sort of. The problem is that when I run it, val is turned into an integer, so it thinks that .99 is less than .1. What's going on, and how should I fix the code? class Product < ActiveRecord::Base protected def self.validates_greater_than_zero(*attr_names) validates_each(attr_names) do |record, attr, val| record.errors.add(attr, "should be at least 0.01 (current val = #{val.to_f})") if val.nil? || val < 0.01 end end public validates_presence_of :title, :description, :image_url validates_numericality_of :price validates_greater_than_zero :price end

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• NO-SQL reliable for small bussines app?

  - by mamcx

  I'm deciding between go for a NON-SQL engine or a regular SQL one for a document managment system for small bussines. I have experience with firebird/sql server and found a good track of reliability (specially with firebird). This market is full of crappy "servers" (clon-made PC, the mayority), cheap harddisk, rarely use of RAID or anything like that, some are in locations where a power-off is normal, some not have a UPS, etc... (I will include off-site auto-backup to external servers, but that no change the internal setup). (I know about end-user education about such proper setups, but is stupid depend on that, so stick to te point) From the desing point of view, a schema-less database is the way to go for my system, but, I worry if any of the actual solutions (MongoDb, Tokyo Cabinet, etc) are like firebird and survice crash, malfunctions & abuse so data corruption is very rare. The plan is store the office documents there & provide a central repository.

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• Mapping of memory addresses to physical modules in Windows XP

  - by Josef Grahn

  I plan to run 32-bit Windows XP on a workstation with dual processors, based on Intel's Nehalem microarchitecture, and triple channel RAM. Even though XP is limited to 4 GB of RAM, my understanding is that it will function with more than 4 GB installed, but will only expose 4 GB (or slightly less). My question is: Assuming that 6 GB of RAM is installed in six 1 GB modules, which physical 4 GB will Windows actually map into its address space? In particular: Will it use all six 1 GB modules, taking advantage of all memory channels? (My guess is yes, and that the mapping to individual modules within a group happens in hardware.) Will it map 2 GB of address space to each of the two NUMA nodes (as each processor has it's own memory interface), or will one processor get fast access to 3 GB of RAM, while the other only has 1 GB? Thanks!

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• zlib memory usage / performance. With 500kb of data.

  - by unixman83

  Is zLib Worth it? Are there other better suited compressors? I am using an embedded system. Frequently, I have only 3MB of RAM or less available to my application. So I am considering using zlib to compress my buffers. I am concerned about overhead however. The buffer's average size will be 30kb. This probably won't get compressed by zlib. Anyone know of a good compressor for extremely limited memory environments? However, I will experience occasional maximum buffer sizes of 700kb, with 500kb much more common. Is zlib worth it in this case? Or is the overhead too much to justify? My sole considerations for compression are RAM overhead of algorithm and performance at least as good as zlib.

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• Gothic Medieval font that you can embed With Cufón?

  - by BioGeek

  Hey, I'm looking for a font in Gothic Medieval style that I can embed with Cufón. I tried with the Cloister Black .ttf file but the generator responded with: The file you uploaded could not be converted. Currently only TrueType (TTF), OpenType (OTF), Printer Font Binary (PFB) and PostScript fonts are supported. If you're sure the font is valid, it is likely that the author of the font has decided to not allow modification and/or embedding of the font. This can happen quite often especially with "freeware" TrueType fonts. You must contact the author of the font for a less restricted version.

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• how to read a User uploaded file, without saving it to the database

  - by GoodGets

  I'd like to be able to read an XML file uploaded by the user (less than 100kb), but not have to first save that file to the database. I don't need that file past the current action (its contents get parsed and added to the database; however, parsing the file is not the problem). Since local files can be read with: File.read("export.opml") I thought about just creating a file_field for :uploaded_file, then trying to read it with File.read(params[:uploaded_file]) but all that does is throw a TypeError (can't convert HashWithIndifferentAccess into String). I really have tried a lot of various things (including reading from the /tmp directory as well), but could get none of them to work. I hope the brevity of my question doesn't mask the effort I've given to try to solve this on my own, but I didn't want to pollute this question with a hundred ways of how NOT to get it done. Big thanks to anyone who chimes in.

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• Teaching coworkers LINQ...

  - by cyberzed

  I have set myself upon a journey to educate my coworkers (all have accepted my mission, even the boss). Every day I seem to find a piece of code that could have been less error prone if my coworkers knew more about the framework, better-know-framework (in courtesy of DNR ;)) is part two of my teaching process. First part is teaching my coworkers about LINQ, what it can do for them and how it is written. My big question is where are all the good basic resources for LINQ education, everything if find is tightly coupled to Linq2Sql or all other sorts of material. Neither have I been able to find a tutorial for the actual linq syntax (except a specification of it all). (I hope this haven't been asked before but if it has please say so, cause then my searching skills have failed ;) )

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• How to find unneccesary dependencies in a maven multi-project?

  - by hstoerr

  If you are developing a large evolving multi module maven project it seems inevitable that there are some dependencies given in the poms that are unneccesary, since they are transitively included by other dependencies. For example this happens if you have a module A that originally includes C. Later you refactor and have A depend on a module B which in turn depends on C. If you are not careful enough you'll wind up with both B and C in A's dependency list. But of course you do not need to put C into A's pom, since it is included transitively, anyway. Is there tool to find such unneccesary dependencies? (These dependencies do not actually hurt, but they might obscure your actual module structure and having less stuff in the pom is usually better. :-)

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• Lombok with Play 2

  - by Alex Povar

  What about Lombok integration with Play Framework 2? I really like Lombok it make my code more readable and less boilerplate. And Play Framework is wonderful too. But there is a great trouble in case if you going to mixup them. Main reason is that scala temlates in play project compiled before domain classes. So Lombok, which itself is compiler's hack do not generate accessors for that time. The question is: if it any ways to make it work? I found some discussions in Google Groups, but they do not provide any reasonable solution. So have you got any success with it? And.. why guys from Play Framework project do not provide some Lombok-like solution? Anyway Play is full of code-generation magic and shadow compiling... so, why not?

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• MS SQL Server: how to optimize "like" queries?

  - by duke84

  I have a query that searches for clients using "like" with wildcard. For example: SELECT TOP (10) [t0].[CLIENTNUMBER], [t0].[FIRSTNAME], [t0].[LASTNAME], [t0].[MI], [t0].[MDOCNUMBER] FROM [dbo].[CLIENT] AS [t0] WHERE (LTRIM(RTRIM([t0].[DOCREVNO])) = '0') AND ([t0].[FIRSTNAME] LIKE '%John%') AND ([t0].[LASTNAME] LIKE '%Smith%') AND ([t0].[SSN] LIKE '%123%') AND ([t0].[CLIENTNUMBER] LIKE '%123%') AND ([t0].[MDOCNUMBER] LIKE '%123%') AND ([t0].[CLIENTINDICATOR] = 'ON') It can also use less parameters in "where" clause, for example: SELECT TOP (10) [t0].[CLIENTNUMBER], [t0].[FIRSTNAME], [t0].[LASTNAME], [t0].[MI], [t0].[MDOCNUMBER] FROM [dbo].[CLIENT] AS [t0] WHERE (LTRIM(RTRIM([t0].[DOCREVNO])) = '0') AND ([t0].[FIRSTNAME] LIKE '%John%') AND ([t0].[CLIENTINDICATOR] = 'ON') Can anybody tell what is the best way to optimize performance of such query? Maybe I need to create an index? This table can have up to 1000K records in production.

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• Huge dataset point in polygon in .net (collision detection)

  - by Rickard Liljeberg

  I have a pretty big mesh with polygons, usually triangles but sometimes rectangles. Each point in my mesh has a value (value has nothing to do with coordinates). Now I am creating a second mesh in the same coordinate-space as the old mesh. I now want to interpolate out values for all points (vertices) in the new mesh using the values from the old mesh. Now I could loop each polygon in the new mesh and detect which old vertices are in each polygon by making 2d collision detection (altho even this I don't get to function properly so if anyone has simple and fast code for 2d collision detection (triangle is enough) I would gladly see it). However to my main point again. looping each old vertice for each new polygon seems less than efficient. is there a better way?

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• C# Sequence Diagramm Reverse Engineering Tool?

  - by Wayne

  It's essential for me to find a tool that will reverse engineer sequence diagrams by integrating with the debugger. I suppose using the profiler could work also but less desirable. It's a key requirement that the tool in question will record all threads of execution since the app, TickZoom, is heavily parallelized. We just evaluated a most awesome tool from Sparx called Enterprise Architect which integrates with the debugger. It allows you to set a break point, start recording method traces from that break point. It's a lovely design and GUI. Hope it works for you but it only records a single thread of execution so that makes it unusable for us. I will put in a feature request to Sparx. But hope to find a similar tool that does this now since that's the only features we need--not all the other stuff that Sparx also does rather well. Sincerely, Wayne

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• SQL Server: how to optimize "like" queries?

  - by duke84

  I have a query that searches for clients using "like" with wildcard. For example: SELECT TOP (10) [t0].[CLIENTNUMBER], [t0].[FIRSTNAME], [t0].[LASTNAME], [t0].[MI], [t0].[MDOCNUMBER] FROM [dbo].[CLIENT] AS [t0] WHERE (LTRIM(RTRIM([t0].[DOCREVNO])) = '0') AND ([t0].[FIRSTNAME] LIKE '%John%') AND ([t0].[LASTNAME] LIKE '%Smith%') AND ([t0].[SSN] LIKE '%123%') AND ([t0].[CLIENTNUMBER] LIKE '%123%') AND ([t0].[MDOCNUMBER] LIKE '%123%') AND ([t0].[CLIENTINDICATOR] = 'ON') It can also use less parameters in "where" clause, for example: SELECT TOP (10) [t0].[CLIENTNUMBER], [t0].[FIRSTNAME], [t0].[LASTNAME], [t0].[MI], [t0].[MDOCNUMBER] FROM [dbo].[CLIENT] AS [t0] WHERE (LTRIM(RTRIM([t0].[DOCREVNO])) = '0') AND ([t0].[FIRSTNAME] LIKE '%John%') AND ([t0].[CLIENTINDICATOR] = 'ON') Can anybody tell what is the best way to optimize performance of such query? Maybe I need to create an index? This table can have up to 1000K records in production.

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• Using Linux vs Windows for development

  - by Philipp Lenssen

  On my servers I run everything on Linux/ Apache, but for offline preparation before upload of the projects I'm using Windows (Vista) with a local Apache/ WAMP, PHP, Python, GD_image installation and so on. My question, would it be much easier in terms of setting up a good environment if I were to use Linux, e.g. Ubuntu distribution, as development OS for these things? Would you know some pros and cons when it comes to Windows vs Linux in terms of web development? (As I'm using mostly web apps these days, switching the OS might be less of a problem. I would need a good replacement for my image editor, though, as I prefer Corel PhotoPaint and PSP4 over Gimp, last time I tried.)

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• Calculating a range of an exact number of values in Python

  - by Einar

  Hello, I'm building a range between two numbers (floats) and I'd like this range to be of an exact fixed length (no more, no less). range and arange work with steps, instead. To put things into pseudo Python, this is what I'd like to achieve: start_value = -7.5 end_value = 0.1 my_range = my_range_function(star_value, end_value, length=6) print my_range [-7.50,-5.98,-4.46,-2.94,-1.42,0.10] This is essentially equivalent to the R function seq which can specify a sequence of a given length. Is this possible in Python? Thanks.

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• Pretty output question

  - by sid_com

  Hello! #!/usr/bin/env perl use warnings; use strict; my $text = 'hello ' x 30; printf "%-20s : %s\n", 'very important text', $text; the output of this script looks more ore less like this: very important text : hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello hello ... but I would like an output like this: very important text: hello hello hello hello hello hello hello hello hello hello hello hello ... How could I change my script to reach my goal?

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• performance issue in a select query from a single table

  - by daedlus

  Hi , I have a table as below dbo.UserLogs ------------------------------------- Id | UserId |Date | Name| P1 | Dirty ------------------------------------- There can be several records per userId[even in millions] I have clustered index on Date column and query this table very frequently in time ranges. The column 'Dirty' is non-nullable and can take either 0 or 1 only so I have no indexes on 'Dirty' I have several millions of records in this table and in one particular case in my application i need to query this table to get all UserId that have at least one record that is marked dirty. I tried this query - select distinct(UserId) from UserLogs where Dirty=1 I have 10 million records in total and this takes like 10min to run and i want this to run much faster than this. [i am able to query this table on date column in less than a minute.] Any comments/suggestion are welcome. my env 64bit,sybase15.0.3,Linux

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• What happened to Perl?

  - by llasa

  I will try to keep this as objective as possible. I've been dealing with PHP since 3 years know, I have always known of Perl but never really "dived" into it. So I took a look at some Perl code examples and I thought: Wow, It's like PHP just failed at cloning it. My questions are: What is bad about Perl? What are the disadvantages that made it so extremely unpopular so that it is actually dying right know? Why could PHP take over? What does PHP have (or what did it have in the times of PHP4) that made it rise in popularity compared to Perl? I'm rather young and the questions above are a bit subjective and I think you can only really answer them when you have experienced the rise of PHP along with the fall of Perl. Unless my question before I hope that this one here can be more or less completely answered. There have to be definite disadvantages Perl has compared to PHP that made it fall.

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• I am getting exception in main thread...even when i am handling the exception

  - by fari

  public KalaGame(KeyBoardPlayer player1,KeyBoardPlayer player2) { //super(0); int key=0; try { do{ System.out.println("Enter the number of stones to play with: "); BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); key = Integer.parseInt(br.readLine()); if(key<0 || key>10) throw new InvalidStartingStonesException(key); } while(key<0 || key>10); player1=new KeyBoardPlayer(); player2 = new KeyBoardPlayer(); this.player1=player1; this.player2=player2; state=new KalaGameState(key); } catch(IOException e) { System.out.println(e); } } when i enter an invalid number of stones i get this error Exception in thread "main" InvalidStartingStonesException: The number of starting stones must be greater than 0 and less than or equal to 10 (attempted 22) why isn't the exception handled by the throw i defined at KalaGame.<init>(KalaGame.java:27) at PlayKala.main(PlayKala.java:10)

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• Who does non-decimal bignums with floating radix point?

  - by boost

  Nice as the Tcl libraries math::bignum and math::bigfloat are, the middle ground between the two needs to be addressed. Namely, bignums which are in different radices and have a radix point. At present math::bignum only handles integers (afaict) and math::bigfloat won't let you specify different radices to math::bigfloat::fromstr (ditto). Does anyone know of a library, for any of the major scripting languages (e.g. Tcl, Perl, Python, Ruby, Lua) or less major ones (newLISP for example), which implements bignums in different radices with handling for radix point?

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• Is there a way to put relationships/contraints into CSS?

  - by hekevintran

  In every design tool or art principle I've heard of, relationships are a central theme. By relationships I mean the thing you can do in Adobe Illustrator to specify that the height of one shape is equal to half the height of another. You cannot express this information in CSS. CSS hard-codes all values. Using a language like LESS that allows variables and arithmetic you can get closer to relationships but it's still a CSS variant. This inability in my mind is the biggest problem with CSS. CSS is supposed to be a language that describes the visual component of a Web page but it ignores relationships and contraints, ideas that are at the core of art. How possible is it to imagine a new Web design language that can express relationships and contraints that can be implemented in JavaScript using the current CSS properties?

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• Level of SVG SMIL (animation) support among the browsers

  - by user246114

  Hi, Does anyone know the current state of SVG SMIL animation support in the popular browsers? It looks like Safari, Chrome, and Opera support it. Firefox has confusing reports in their dev pages about SMIL support having been added, but I don't see it as of v3.6: https://bugzilla.mozilla.org/show_bug.cgi?id=216462 I am ignoring IE since they don't even support SVG at all, and probably never will, much less SMIL. The other thing - just comparing this test page between Safari, Chrome, and Opera: http://srufaculty.sru.edu/david.dailey/svg/ovaling.svg looks like Opera is the only one that renders it correctly. Should we not be using SMIL - kind of looks half-baked in all the browsers (sadly)? Blast. Thanks

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