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  • How do I implement layers on a tile map?

    - by mitch
    I have a game where, based upon the visible tiles in the viewport, I need to retrieve data of items in the visible tiles. I am planning to use Javascript to AJAX request in a batch based upon the visible tiles which contain image tags like Google Maps. The layer will be in SVG or canvas. The item information will be in JSON format. What is the best approach, to fetch the data? I currently have complex class I wrote in Javascript which determines the visible columns/rows and offsets relative to the visible area shown. Each item is also user contributed and will be rendered in canvas or SVG layer.

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  • Sprite.js surface background

    - by user1086671
    I'm making a tile-based game using Sprite.js. It is not easy to redraw every tile each frame, so I tried to make a scrolling surface background. There is an example here http://batiste.dosimple.ch/sprite.js/tests/test_scrolling.html The example works, but it seems like ScrollingSurface.update is buggy or there is something I'm missing. What I tried to do is to draw 5x5 tiles and after 5 seconds draw another 5x5 tiles near the first ones. But it draws only the first ones. And surface.update() only updates the position of surface. Here is my code https://github.com/Sektoid/sprite.js/blob/master/tests/test_scrolling.html (You need also to set this.divider = 1.0 in scrolling.js to avoid drawing the same tiles 4 times.) There aren't any sprite.js-forums like with the other sprite- and game-engines have, so I'm asking here.

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  • How to check if a variable is an integer? [closed]

    - by FyrePlanet
    I'm going through my C++ book and have currently made a working Guess The Number game. The game generates a random number based on current time, has the user input their guess, and then tells them whether it was too high, too low, or the correct number. The game functions fine if you enter a number, but returns 'Too High' if you enter something that is not a number (such as a letter or punctuation). Not only does it return 'too high', but it also continually returns it. I was wondering what I could do to check if the guess, as input by the user, is an integer and if it is not, to return 'Not a number. Guess again.' Here is the code. #include <iostream> #include <cstdlib> #include <ctime> using namespace std; int main() { srand(time(0)); // seed the random number generator int theNumber = rand() % 100 + 1; // random number between 1 and 100 int tries = 0, guess; cout << "\tWelcome to Guess My Number!\n\n"; do { cout << "Enter a guess: "; cin >> guess; ++tries; if (guess > theNumber) cout << "Too high!\n\n"; if (guess < theNumber) cout << "Too low!\n\n"; } while (guess != theNumber); cout << "\nThat's it! You got it in " << tries << " guesses!\n"; cout << "\nPress Enter to exit.\n"; cin.ignore(cin.rdbuf()->in_avail() + 1); return 0; }

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  • Why doe my UITableView only show two rows of each section?

    - by Mike Owens
    I have a UITableView and when I build it only two rows will be displayed. Each section has more than two cells to be displayed, I am confused since they are all done the same?`#import #import "Store.h" import "VideoViewController.h" @implementation Store @synthesize listData; // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [self createTableData]; [super viewDidLoad]; } (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } (void)viewDidUnload { //self.listData = nil; //[super viewDidUnload]; // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } pragma mark - pragma mark Table View Data Source Methods // Customize the number of sections in the table view. - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return [videoSections count]; } //Get number of rows -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [self.listData count]; } -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *StoreTableIdentifier = @"StoreTableIdentifier"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:StoreTableIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:StoreTableIdentifier] autorelease]; } cell.textLabel.text = [[[listData objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"name"]; //Change font and color of tableView cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; cell.textLabel.font=[UIFont fontWithName:@"Georgia" size:16.0]; cell.textLabel.textColor = [UIColor brownColor]; return cell; } -(NSString *)tableView: (UITableView *)tableView titleForHeaderInSection: (NSInteger) section { return [videoSections objectAtIndex:section]; } -(void)tableView: (UITableView *)tableView didSelectRowAtIndexPath: (NSIndexPath *)indexPath { VideoViewController *videoViewController = [[VideoViewController alloc] initWithNibName: @"VideoViewController" bundle:nil]; videoViewController.detailURL = [[NSURL alloc] initWithString: [[[listData objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"url"]]; videoViewController.title = [[[listData objectAtIndex:indexPath.section] objectAtIndex:indexPath.row] objectForKey:@"name"]; [self.navigationController pushViewController:videoViewController animated:YES]; [videoViewController release]; } pragma mark Table View Methods //Data in table cell -(void) createTableData { NSMutableArray *beginningVideos; NSMutableArray *intermediateVideos; videoSections = [[NSMutableArray alloc] initWithObjects: @"Beginning Videos", @"Intermediate Videos", nil]; beginningVideos = [[NSMutableArray alloc] init]; intermediateVideos = [[NSMutableArray alloc] init]; [beginningVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Shirts", @"name", @"http://www.andalee.com/iPhoneVideos/testMovie.m4v", @"url", nil]]; [beginningVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Posters", @"name", @"http://devimages.apple.com/iphone/samples/bipbopall.html", @"url", nil]]; [beginningVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Stickers",@"name", @"http://www.andalee.com/iPhoneVideos/mov.MOV",@"url",nil]]; [beginningVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Egyptian",@"name", @"http://www.andalee.com/iPhoneVideos/2ndMovie.MOV",@"url",nil]]; [intermediateVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Drum Solo", @"name", @"http://www.andalee.com", @"url", nil]]; [intermediateVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Veil", @"name", @"http://www.andalee.com", @"url", nil]]; [intermediateVideos addObject:[[NSMutableDictionary alloc] initWithObjectsAndKeys:@"Three Quarter Shimmy",@"name", @"http://www.andalee.com", @"url",nil]]; listData = [[NSMutableArray alloc] initWithObjects:beginningVideos, intermediateVideos, nil]; [beginningVideos release]; [intermediateVideos release]; } (void)dealloc { [listData release]; [videoSections release]; [super dealloc]; } @end `

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  • Can MySQL reasonably perform queries on billions of rows?

    - by haxney
    I am planning on storing scans from a mass spectrometer in a MySQL database and would like to know whether storing and analyzing this amount of data is remotely feasible. I know performance varies wildly depending on the environment, but I'm looking for the rough order of magnitude: will queries take 5 days or 5 milliseconds? Input format Each input file contains a single run of the spectrometer; each run is comprised of a set of scans, and each scan has an ordered array of datapoints. There is a bit of metadata, but the majority of the file is comprised of arrays 32- or 64-bit ints or floats. Host system |----------------+-------------------------------| | OS | Windows 2008 64-bit | | MySQL version | 5.5.24 (x86_64) | | CPU | 2x Xeon E5420 (8 cores total) | | RAM | 8GB | | SSD filesystem | 500 GiB | | HDD RAID | 12 TiB | |----------------+-------------------------------| There are some other services running on the server using negligible processor time. File statistics |------------------+--------------| | number of files | ~16,000 | | total size | 1.3 TiB | | min size | 0 bytes | | max size | 12 GiB | | mean | 800 MiB | | median | 500 MiB | | total datapoints | ~200 billion | |------------------+--------------| The total number of datapoints is a very rough estimate. Proposed schema I'm planning on doing things "right" (i.e. normalizing the data like crazy) and so would have a runs table, a spectra table with a foreign key to runs, and a datapoints table with a foreign key to spectra. The 200 Billion datapoint question I am going to be analyzing across multiple spectra and possibly even multiple runs, resulting in queries which could touch millions of rows. Assuming I index everything properly (which is a topic for another question) and am not trying to shuffle hundreds of MiB across the network, is it remotely plausible for MySQL to handle this? UPDATE: additional info The scan data will be coming from files in the XML-based mzML format. The meat of this format is in the <binaryDataArrayList> elements where the data is stored. Each scan produces = 2 <binaryDataArray> elements which, taken together, form a 2-dimensional (or more) array of the form [[123.456, 234.567, ...], ...]. These data are write-once, so update performance and transaction safety are not concerns. My naïve plan for a database schema is: runs table | column name | type | |-------------+-------------| | id | PRIMARY KEY | | start_time | TIMESTAMP | | name | VARCHAR | |-------------+-------------| spectra table | column name | type | |----------------+-------------| | id | PRIMARY KEY | | name | VARCHAR | | index | INT | | spectrum_type | INT | | representation | INT | | run_id | FOREIGN KEY | |----------------+-------------| datapoints table | column name | type | |-------------+-------------| | id | PRIMARY KEY | | spectrum_id | FOREIGN KEY | | mz | DOUBLE | | num_counts | DOUBLE | | index | INT | |-------------+-------------| Is this reasonable?

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  • How do I get around "Access is Denied" [Number: 5 (0x80070005)], with IIS6/FastCGI and PHP 5.2.3?

    - by Evan Carroll
    I'm getting this error with IIS 6.0 (i assume), and PHP 5.2.3, and FastCGI FastCGI Error The FastCGI Handler was unable to process the request. Error Details: Error Number: 5 (0x80070005). Error Description: Access is denied. HTTP Error 500 - Server Error. Internet Information Services (IIS) Any ideas, nothing revealings in logs (other than 500 errors), this is pretty much all of I have to work with. The script has read and execute privileged for the internet guest account; and, I've added read/execute privileges to the whole D:\PHP. I followed this tutorial http://learn.iis.net/page.aspx/247/using-fastcgi-to-host-php-applications-on-iis-60/ to set it up. The only major diversion is I installed PHP to D:\PHP

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  • How do I change the number of days a copied transaction log is kept in a log shipping configuration?

    - by Decker
    I think this is a pretty simple and perhaps stupid question. I've established log shipping between two SQL Server 2008 servers using the GUI (i.e. the SQL Server Management Studio). It's been running fine -- but now I want to change the number of days the copied files are retained on the secondary server. Is it simply a matter of going back to the GUI and change it there. Is it smart enough just to make that simple change or is the GUI only used to create the initial log shipping configuration?

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  • Windows virtual wifi hostednetwork - set max number of clients?

    - by user1327408
    I'm building an app that has functionality that creates on the fly a new virtual wifi utilizing the Windows 7 / 2008 features. I can create it just fine, but am looking how to limit the maximum number of connections. By running a "netsh wlan show hostednetwork" command to view my settings - it shows (by default 100), but it HAS to be somewhere in the registry right? - I can't see any settings available for this either at the command line or using the api - so I have to assume it's stored in the reg. I see vwifi and hostednetwork registry keys in HKLM\System\CurrentControlSet\ - Wlansvc\parameters\hostednetworksettings, etc... but can't find any reference to add a "MaxClients" value (or similar) - would like to limit it to only one connection. Has anyone seen any references to this, or know how to do it?

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  • Website with large number of users keeps going down due to memory leaks:Tomcat6 and Java 6

    - by user1766478
    We host many websites on one of our two virtual servers. We use tomcat 6 and Java 6. It is an MVC model with a hibernate like layer. The problem is, one of our biggest clients with the most number of members, keeps crashing the server every 6-8 hours(precisely in the mornings when most members login) We have been having this issue for 4 days now. Trying to figure out the problem but we suspect memory leaks. Any suggestions?

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  • Get the number of tiffs in a multi-tiff with command line ImageMagick?

    - by Anders
    Is there a way to get the number of tiffs in a multi-tiff with a command line utility in ImageMagick? What I want to to is to extract (split) the multi-tiff into single files. However if the tiff only contains one tiff (is not a multi-tiff), I would like to do nothing at all... Also if I use the "%d"-option to name the output files I get the "%d" in the file name if it is only one. ...or is there another way to use ImageMagick to avoid strange filenames when converting?

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  • Does dual-channel work only with an even number of RAM sticks?

    - by iconiK
    I have noticed that on the ASUS P5QL Pro motherboard the BIOS says "Dual Channel Asymmetric Mode" during POST. The motherboard has three 2GB Kingston ValueRAM 800 MHz DIMMs populated in the first 3 slots from the CPU socket. I have not run any benchmarks to verify that dual-channel is somehow being used, but I believed that dual-channel has to have an even number of sticks (and for triple channel, a multiple of 3). Another example is the Intel DX58SO motherboard; it has four DIMM slots, yet it's an LGA 1366 motherboard which does triple-channel. Apparently triple-channel still works with four DIMMs, instead of falling back to dual-channel. What does the BIOS' POST message mean in those case? Is dual-channel really used for the first two DIMMs, with the other one being an odd one in single-channel mode?

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  • What is the optimum number of admins to server?

    - by monocasa
    Hello all. I'm starting a business, and I'd like to know what you guys think the optimum number of admins to server ratio is for financial modeling reasons. Or if there's a better metric to use? I come from an embedded programming background so this is an area that I'm pretty squishy on knowledge-wise. : \ Additional Info: There will be a lot of servers. Mainly Linux boxes, with about 10% Windows boxes. Thanks in advance!

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  • Why does cpio say "WARNING! These file names were not selected" when copying a large number of files

    - by mmm bacon
    For over 10 years, I've been using this strategy to copy a large number of files between UNIX filesystems: cd source_directory find . -depth -print | cpio -pdm /path/to/destination_directory It works like a champ. However, I'm now getting this error from cpio: cpio: WARNING! These file names were not selected: (long list of files here...) The source directory is on OSX 10.5, and the destination directory is a NFS filesystem from an OpenSolaris server. Copying over NFS has never been a problem in the past. There's nothing strange about the filenames, meaning there aren't special characters or anything like that. Any ideas?

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  • What is the maximum number of TCP connections I can have in Windows Server 2008?

    - by evilfred
    I would like to have as many connections (single connections from many different clients) as humanly possible in a server running on Windows Server 2008, in order to support a Comet-style application. The application is written in C#. The connections will not be chatty, they just need to be open (and stay open). Buying boatloads of memory and fast CPUs are not a problem. As far as I can tell, I will be limited to 65k simultaneous open connections per NIC - the maximum number of ports. Is this accurate? Or can I go beyond 65k connections / NIC somehow? It seems like there are server products for Linux at least that support hundreds of thousands of connections. How do they do this?

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  • How do I get around "Access is Denied" [Number: 5 (0x80070005)], with IIS6/FastCGI and PHP 5.2.3?

    - by Evan Carroll
    I'm getting this error with IIS 6.0 (i assume), and PHP 5.2.3, and FastCGI FastCGI Error The FastCGI Handler was unable to process the request. Error Details: Error Number: 5 (0x80070005). Error Description: Access is denied. HTTP Error 500 - Server Error. Internet Information Services (IIS) Any ideas, nothing revealings in logs (other than 500 errors), this is pretty much all of I have to work with. The script has read and execute privileged for the internet guest account; and, I've added read/execute privileges to the whole D:\PHP. I followed this tutorial http://learn.iis.net/page.aspx/247/using-fastcgi-to-host-php-applications-on-iis-60/ to set it up. The only major diversion is I installed PHP to D:\PHP

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  • How do I estimate the number of RSS subscribers?

    - by Robert Kosara
    I'm running a website, and would like to get a better idea how many subscribers I have. I can check the number of subscribers on Google Reader for my two feeds (RSS and Atom). I also have access to my server logs, so I sometimes collect all the IP addresses that access the feeds over a month or so and do a uniq. Is that an accurate way of doing this? Are there other feed aggregators that I need to take into account? Any pitfalls when just going by IP address? I've also thought about embedding an image in the feeds to get a better count. But do all feed readers load images automatically?

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  • How can I regress a number series in Excel?

    - by jcollum
    I'd like to use these data to derive an equation using Excel. 300 13 310 12.6 320 12.2 330 11.8 340 11.4 350 11 360 10.8 370 10.6 380 10.4 As x goes up, y goes down. Seems straightforward. But when I do a polynomial regression on these data, even though the trendline matches the data pretty well, the equation it generates doesn't work. The equation is When I plug in x values to that equation, the numbers go up! So something is pretty wrong here. My steps: place both number series in excel select the second set (13, 12.6 ...) plot a line graph set the first set as the x axis labels select Series1 and add a polynomial (2) trendline, display equation, display R-squared That produces the equation above, with an R^2 value of .9955. But when I use that equation, it doesn't produce those outputs for those inputs. Clearly I'm doing something wrong.

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  • How can I reroute a sub-domain to localhost + port number?

    - by urig
    I have several web applications running on my developer machine. They mimic our production web applications which are hosted on sub-domain. For example, consider: api.myserver.com - is mimicked by 127.0.0.1:8000 www.myserver.com - is mimicked by 127.0.0.1:8008 and so on... How can I make it so that, on my Windows 7 machine, HTTP calls to "api.myserver.com" (note the lack of port number) are redirected to 127.0.0.1:8000 etc? Note that this needs to apply both to client-side calls (in the browser) and server-side calls (from IIS to Python development server and vice versa). Do I need a proxy to run locally to achieve this? Can you recommend such a tool?

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  • Adding text to the beginning and end of a number of files?

    - by John Feminella
    I have a number of files in a directory hierarchy. For each file, I'd like to add "abcdef" to the beginning, on its own line, and "ghijkl" to the end, on its own line. For example, if the files initially contained: # one/foo.txt apples bananas # two/three/bar.txt coconuts Then afterwards, I'd expect them to contain: # one/foo.txt abcdef apples bananas ghijkl # two/three/bar.txt abcdef coconuts ghijkl What's the best way to do this? I've gotten as far as: # put stuff at start of file find . -type f -print0 | xargs -0 sed -i 's/.../abcdef/g' # put stuff at end of file find . -type f -print0 | xargs -0 sed -i 's/.../ghijkl/g' but I can't seem to figure out how what to put in the ellipses.

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  • Why obfuscating a serial number of a device? What is the risk?

    - by Horst Walter
    In one of my xx.stackexchange questions I've got an answer, in which the user has obfuscated his disk's SN (serial number). Recently I have seen this in several photos as well, the SN was blurred out. I' am just curious, because I have never paid attention to this. What could be the potential risk in publishing a device's SN? I do see some sense when it comes to a MAC address, OK, this could be used for tracking. But a SN of a disk, iPad, whatsoever? Maybe there is an important reason for not publishing it, which I haven't seen so far.

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  • Simplest way to respawn configured number of instances of a specific process.

    - by Zwei Steinen
    So we have an app. which we wan to run multiple instance of it in linux. The number should be configurable. We also want that whenever one of the instance disappears, a new one is booted up. I was looking into C based programs, shell script, python script etc. but I was wondering what would be the most simple, easiest way to do it. Are there any tools out there? Can one simply use some linux built-in functionality? Linux distribution is Red Hat.

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  • Suitable GUI for sorting rows at database level and/or WYSIWYG level?

    - by Kristoffer
    Consider an Explorer-like list view with a number of columns. The data is fetched from a database, and the rows can be sorted by clicking the column headers. When you click column A, you expect the fetched data to be sorted by A - at the database level ("ORDER BY" at the selected column). However, sometimes it is desirable to sort the data presented in the GUI - the visible data (WYSIWYG). How do you combine these two? E.g. How do you allow the user to sort both the fetched data and the data visible in the GUI? Have you seen a GUI that solves this elegantly?

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  • T-SQL XML Query, how to seperate matching nodes into individual rows?

    - by FlySwat
    I have a table that has a column full of XML like: <parent> <child> <name>Sally</name> </child> <child> <name>Bobby</name> </child> </parent> I'm trying to extract all of the names of the children into seperate rows. My desired resultset would look like: Sally Bobby However, if I do something like: SELECT data.query('data(//parents/child/name)') FROM stuff I get back a single row that looks like Sally Bobby What am I doing wrong with the XPath?

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