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  • UIScrollView without paging but with touchesmoved

    - by BittenApple
    I have a UIScrollView that I use to display PDF pages in. I don't want to use paging (yet). I want to display content based on touchesmoved event (so after horizontal swipe). This works (sort of), but instead of catching a single swipe and showing 1 page, the swipe seems to gets broken into 100s of pieces and 1 swipe acts as if you're moving a slider! I have no clue what am I doing wrong. Here's the experimental "display next page" code which works on single taps: - (void)nacrtajNovuStranicu:(CGContextRef)myContext { CGContextTranslateCTM(myContext, 0.0, self.bounds.size.height); CGContextScaleCTM(myContext, 1.0, -1.0); CGContextSetRGBFillColor(myContext, 255, 255, 255, 1); CGContextFillRect(myContext, CGRectMake(0, 0, 320, 412)); size_t brojStranica = CGPDFDocumentGetNumberOfPages(pdfFajl); if(pageNumber < brojStranica){ pageNumber ++; } else{ // kraj PDF fajla, ne listaj dalje. } CGPDFPageRef page = CGPDFDocumentGetPage(pdfFajl, pageNumber); CGContextSaveGState(myContext); CGAffineTransform pdfTransform = CGPDFPageGetDrawingTransform(page, kCGPDFCropBox, self.bounds, 0, true); CGContextConcatCTM(myContext, pdfTransform); CGContextDrawPDFPage(myContext, page); CGContextRestoreGState(myContext); //osvjezi displej [self setNeedsDisplay]; } Here's the swiping code: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { [super touchesBegan:touches withEvent:event]; UITouch *touch = [touches anyObject]; gestureStartPoint = [touch locationInView:self]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint currentPosition = [touch locationInView:self]; CGFloat deltaX = fabsf(gestureStartPoint.x - currentPosition.x); CGFloat deltaY = fabsf(gestureStartPoint.y - currentPosition.y); if (deltaX >= kMinimumGestureLength && deltaY <= kMaximumVariance) { [self nacrtajNovuStranicu:(CGContextRef)UIGraphicsGetCurrentContext()]; } } The code sits in UIView which displays the PDF content, perhaps I should place it into UIScrollView or is the "display next page" code wrong?

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  • video and file caching with squid lusca?

    - by moon
    hello all i have configured squid lusca on ubuntu 11.04 version and also configured the video caching but the problem is the squid cannot configure the video more than 2 min long and the file of size upto 5.xx mbs only. here is my config please guide me how can i cache the long videos and files with squid: > # PORT and Transparent Option http_port 8080 transparent server_http11 on icp_port 0 > > # Cache Directory , modify it according to your system. > # but first create directory in root by mkdir /cache1 > # and then issue this command chown proxy:proxy /cache1 > # [for ubuntu user is proxy, in Fedora user is SQUID] > # I have set 500 MB for caching reserved just for caching , > # adjust it according to your need. > # My recommendation is to have one cache_dir per drive. zzz > > #store_dir_select_algorithm round-robin cache_dir aufs /cache1 500 16 256 cache_replacement_policy heap LFUDA memory_replacement_policy heap > LFUDA > > # If you want to enable DATE time n SQUID Logs,use following emulate_httpd_log on logformat squid %tl %6tr %>a %Ss/%03Hs %<st %rm > %ru %un %Sh/%<A %mt log_fqdn off > > # How much days to keep users access web logs > # You need to rotate your log files with a cron job. For example: > # 0 0 * * * /usr/local/squid/bin/squid -k rotate logfile_rotate 14 debug_options ALL,1 cache_access_log /var/log/squid/access.log > cache_log /var/log/squid/cache.log cache_store_log > /var/log/squid/store.log > > #I used DNSAMSQ service for fast dns resolving > #so install by using "apt-get install dnsmasq" first dns_nameservers 127.0.0.1 101.11.11.5 ftp_user anonymous@ ftp_list_width 32 ftp_passive on ftp_sanitycheck on > > #ACL Section acl all src 0.0.0.0/0.0.0.0 acl manager proto cache_object acl localhost src 127.0.0.1/255.255.255.255 acl > to_localhost dst 127.0.0.0/8 acl SSL_ports port 443 563 # https, snews > acl SSL_ports port 873 # rsync acl Safe_ports port 80 # http acl > Safe_ports port 21 # ftp acl Safe_ports port 443 563 # https, snews > acl Safe_ports port 70 # gopher acl Safe_ports port 210 # wais acl > Safe_ports port 1025-65535 # unregistered ports acl Safe_ports port > 280 # http-mgmt acl Safe_ports port 488 # gss-http acl Safe_ports port > 591 # filemaker acl Safe_ports port 777 # multiling http acl > Safe_ports port 631 # cups acl Safe_ports port 873 # rsync acl > Safe_ports port 901 # SWAT acl purge method PURGE acl CONNECT method > CONNECT http_access allow manager localhost http_access deny manager > http_access allow purge localhost http_access deny purge http_access > deny !Safe_ports http_access deny CONNECT !SSL_ports http_access allow > localhost http_access allow all http_reply_access allow all icp_access > allow all > > #========================== > # Administrative Parameters > #========================== > > # I used UBUNTU so user is proxy, in FEDORA you may use use squid cache_effective_user proxy cache_effective_group proxy cache_mgr > [email protected] visible_hostname proxy.aacable.net unique_hostname > [email protected] > > #============= > # ACCELERATOR > #============= half_closed_clients off quick_abort_min 0 KB quick_abort_max 0 KB vary_ignore_expire on reload_into_ims on log_fqdn > off memory_pools off > > # If you want to hide your proxy machine from being detected at various site use following via off > > #============================================ > # OPTIONS WHICH AFFECT THE CACHE SIZE / zaib > #============================================ > # If you have 4GB memory in Squid box, we will use formula of 1/3 > # You can adjust it according to your need. IF squid is taking too much of RAM > # Then decrease it to 128 MB or even less. > > cache_mem 256 MB minimum_object_size 512 bytes maximum_object_size 500 > MB maximum_object_size_in_memory 128 KB > > #============================================================$ > # SNMP , if you want to generate graphs for SQUID via MRTG > #============================================================$ > #acl snmppublic snmp_community gl > #snmp_port 3401 > #snmp_access allow snmppublic all > #snmp_access allow all > > #============================================================ > # ZPH , To enable cache content to be delivered at full lan speed, > # To bypass the queue at MT. > #============================================================ tcp_outgoing_tos 0x30 all zph_mode tos zph_local 0x30 zph_parent 0 > zph_option 136 > > # Caching Youtube acl videocache_allow_url url_regex -i \.youtube\.com\/get_video\? acl videocache_allow_url url_regex -i > \.youtube\.com\/videoplayback \.youtube\.com\/videoplay > \.youtube\.com\/get_video\? acl videocache_allow_url url_regex -i > \.youtube\.[a-z][a-z]\/videoplayback \.youtube\.[a-z][a-z]\/videoplay > \.youtube\.[a-z][a-z]\/get_video\? acl videocache_allow_url url_regex > -i \.googlevideo\.com\/videoplayback \.googlevideo\.com\/videoplay \.googlevideo\.com\/get_video\? acl videocache_allow_url url_regex -i > \.google\.com\/videoplayback \.google\.com\/videoplay > \.google\.com\/get_video\? acl videocache_allow_url url_regex -i > \.google\.[a-z][a-z]\/videoplayback \.google\.[a-z][a-z]\/videoplay > \.google\.[a-z][a-z]\/get_video\? acl videocache_allow_url url_regex > -i proxy[a-z0-9\-][a-z0-9][a-z0-9][a-z0-9]?\.dailymotion\.com\/ acl videocache_allow_url url_regex -i vid\.akm\.dailymotion\.com\/ acl > videocache_allow_url url_regex -i > [a-z0-9][0-9a-z][0-9a-z]?[0-9a-z]?[0-9a-z]?\.xtube\.com\/(.*)flv acl > videocache_allow_url url_regex -i \.vimeo\.com\/(.*)\.(flv|mp4) acl > videocache_allow_url url_regex -i > va\.wrzuta\.pl\/wa[0-9][0-9][0-9][0-9]? acl videocache_allow_url > url_regex -i \.youporn\.com\/(.*)\.flv acl videocache_allow_url > url_regex -i \.msn\.com\.edgesuite\.net\/(.*)\.flv acl > videocache_allow_url url_regex -i \.tube8\.com\/(.*)\.(flv|3gp) acl > videocache_allow_url url_regex -i \.mais\.uol\.com\.br\/(.*)\.flv acl > videocache_allow_url url_regex -i > \.blip\.tv\/(.*)\.(flv|avi|mov|mp3|m4v|mp4|wmv|rm|ram|m4v) acl > videocache_allow_url url_regex -i > \.apniisp\.com\/(.*)\.(flv|avi|mov|mp3|m4v|mp4|wmv|rm|ram|m4v) acl > videocache_allow_url url_regex -i \.break\.com\/(.*)\.(flv|mp4) acl > videocache_allow_url url_regex -i redtube\.com\/(.*)\.flv acl > videocache_allow_dom dstdomain .mccont.com .metacafe.com > .cdn.dailymotion.com acl videocache_deny_dom dstdomain > .download.youporn.com .static.blip.tv acl dontrewrite url_regex > redbot\.org \.php acl getmethod method GET > > storeurl_access deny dontrewrite storeurl_access deny !getmethod > storeurl_access deny videocache_deny_dom storeurl_access allow > videocache_allow_url storeurl_access allow videocache_allow_dom > storeurl_access deny all > > storeurl_rewrite_program /etc/squid/storeurl.pl > storeurl_rewrite_children 7 storeurl_rewrite_concurrency 10 > > acl store_rewrite_list urlpath_regex -i > \/(get_video\?|videodownload\?|videoplayback.*id) acl > store_rewrite_list urlpath_regex -i \.flv$ \.mp3$ \.mp4$ \.swf$ \ > storeurl_access allow store_rewrite_list storeurl_access deny all > > refresh_pattern -i \.flv$ 10080 80% 10080 override-expire > override-lastmod reload-into-ims ignore-reload ignore-no-cache > ignore-private ignore-auth refresh_pattern -i \.mp3$ 10080 80% 10080 > override-expire override-lastmod reload-into-ims ignore-reload > ignore-no-cache ignore-private ignore-auth refresh_pattern -i \.mp4$ > 10080 80% 10080 override-expire override-lastmod reload-into-ims > ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern -i \.swf$ 10080 80% 10080 override-expire > override-lastmod reload-into-ims ignore-reload ignore-no-cache > ignore-private ignore-auth refresh_pattern -i \.gif$ 10080 80% 10080 > override-expire override-lastmod reload-into-ims ignore-reload > ignore-no-cache ignore-private ignore-auth refresh_pattern -i \.jpg$ > 10080 80% 10080 override-expire override-lastmod reload-into-ims > ignore-reload ignore-no-cache ignore-private ignore-auth > refresh_pattern -i \.jpeg$ 10080 80% 10080 override-expire > override-lastmod reload-into-ims ignore-reload ignore-no-cache > ignore-private ignore-auth refresh_pattern -i \.exe$ 10080 80% 10080 > override-expire override-lastmod reload-into-ims ignore-reload > ignore-no-cache ignore-private ignore-auth > > # 1 year = 525600 mins, 1 month = 10080 mins, 1 day = 1440 refresh_pattern (get_video\?|videoplayback\?|videodownload\?|\.flv?) > 10080 80% 10080 ignore-no-cache ignore-private override-expire > override-lastmod reload-into-ims refresh_pattern > (get_video\?|videoplayback\?id|videoplayback.*id|videodownload\?|\.flv?) > 10080 80% 10080 ignore-no-cache ignore-private override-expire > override-lastmod reload-into-ims refresh_pattern \.(ico|video-stats) > 10080 80% 10080 override-expire ignore-reload ignore-no-cache > ignore-private ignore-auth override-lastmod negative-ttl=10080 > refresh_pattern \.etology\? 10080 > 80% 10080 override-expire ignore-reload ignore-no-cache > refresh_pattern galleries\.video(\?|sz) 10080 > 80% 10080 override-expire ignore-reload ignore-no-cache > refresh_pattern brazzers\? 10080 > 80% 10080 override-expire ignore-reload ignore-no-cache > refresh_pattern \.adtology\? 10080 > 80% 10080 override-expire ignore-reload ignore-no-cache > refresh_pattern > ^.*(utm\.gif|ads\?|rmxads\.com|ad\.z5x\.net|bh\.contextweb\.com|bstats\.adbrite\.com|a1\.interclick\.com|ad\.trafficmp\.com|ads\.cubics\.com|ad\.xtendmedia\.com|\.googlesyndication\.com|advertising\.com|yieldmanager|game-advertising\.com|pixel\.quantserve\.com|adperium\.com|doubleclick\.net|adserving\.cpxinteractive\.com|syndication\.com|media.fastclick.net).* > 10080 20% 10080 ignore-no-cache ignore-private override-expire > ignore-reload ignore-auth negative-ttl=40320 max-stale=10 > refresh_pattern ^.*safebrowsing.*google 10080 80% 10080 > override-expire ignore-reload ignore-no-cache ignore-private > ignore-auth negative-ttl=10080 refresh_pattern > ^http://((cbk|mt|khm|mlt)[0-9]?)\.google\.co(m|\.uk) 10080 80% > 10080 override-expire ignore-reload ignore-private negative-ttl=10080 > refresh_pattern ytimg\.com.*\.jpg > 10080 80% 10080 override-expire ignore-reload refresh_pattern > images\.friendster\.com.*\.(png|gif) 10080 80% > 10080 override-expire ignore-reload refresh_pattern garena\.com > 10080 80% 10080 override-expire reload-into-ims refresh_pattern > photobucket.*\.(jp(e?g|e|2)|tiff?|bmp|gif|png) 10080 80% > 10080 override-expire ignore-reload refresh_pattern > vid\.akm\.dailymotion\.com.*\.on2\? 10080 80% > 10080 ignore-no-cache override-expire override-lastmod refresh_pattern > mediafire.com\/images.*\.(jp(e?g|e|2)|tiff?|bmp|gif|png) 10080 80% > 10080 reload-into-ims override-expire ignore-private refresh_pattern > ^http:\/\/images|pics|thumbs[0-9]\. 10080 80% > 10080 reload-into-ims ignore-no-cache ignore-reload override-expire > refresh_pattern ^http:\/\/www.onemanga.com.*\/ > 10080 80% 10080 reload-into-ims ignore-no-cache ignore-reload > override-expire refresh_pattern > ^http://v\.okezone\.com/get_video\/([a-zA-Z0-9]) 10080 80% 10080 > override-expire ignore-reload ignore-no-cache ignore-private > ignore-auth override-lastmod negative-ttl=10080 > > #images facebook refresh_pattern -i \.facebook.com.*\.(jpg|png|gif) 10080 80% 10080 ignore-reload override-expire ignore-no-cache > refresh_pattern -i \.fbcdn.net.*\.(jpg|gif|png|swf|mp3) > 10080 80% 10080 ignore-reload override-expire ignore-no-cache > refresh_pattern static\.ak\.fbcdn\.net*\.(jpg|gif|png) > 10080 80% 10080 ignore-reload override-expire ignore-no-cache > refresh_pattern ^http:\/\/profile\.ak\.fbcdn.net*\.(jpg|gif|png) > 10080 80% 10080 ignore-reload override-expire ignore-no-cache > > #All File refresh_pattern -i \.(3gp|7z|ace|asx|bin|deb|divx|dvr-ms|ram|rpm|exe|inc|cab|qt) > 10080 80% 10080 ignore-no-cache override-expire override-lastmod > reload-into-ims refresh_pattern -i > \.(rar|jar|gz|tgz|bz2|iso|m1v|m2(v|p)|mo(d|v)|arj|lha|lzh|zip|tar) > 10080 80% 10080 ignore-no-cache override-expire override-lastmod > reload-into-ims refresh_pattern -i > \.(jp(e?g|e|2)|gif|pn[pg]|bm?|tiff?|ico|swf|dat|ad|txt|dll) > 10080 80% 10080 ignore-no-cache override-expire override-lastmod > reload-into-ims refresh_pattern -i > \.(avi|ac4|mp(e?g|a|e|1|2|3|4)|mk(a|v)|ms(i|u|p)|og(x|v|a|g)|rm|r(a|p)m|snd|vob) > 10080 80% 10080 ignore-no-cache override-expire override-lastmod > reload-into-ims refresh_pattern -i > \.(pp(t?x)|s|t)|pdf|rtf|wax|wm(a|v)|wmx|wpl|cb(r|z|t)|xl(s?x)|do(c?x)|flv|x-flv) > 10080 80% 10080 ignore-no-cache override-expire override-lastmod > reload-into-ims > > refresh_pattern -i (/cgi-bin/|\?) 0 0% 0 refresh_pattern ^gopher: > 1440 0% 1440 refresh_pattern ^ftp: 10080 95% 10080 > override-lastmod reload-into-ims refresh_pattern . 1440 > 95% 10080 override-lastmod reload-into-ims

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  • maintaining a large list in python

    - by Oren
    I need to maintain a large list of python pickleable objects that will quickly execute the following algorithm: The list will have 4 pointers and can: Read\Write each of the 4 pointed nodes Insert new nodes before the pointed nodes Increase a pointer by 1 Pop nodes from the beginning of the list (without overlapping the pointers) Add nodes at the end of the list The list can be very large (300-400 MB), so it shouldnt be contained in the RAM. The nodes are small (100-200 bytes) but can contain various types of data. The most efficient way it can be done, in my opinion, is to implement some paging-mechanism. On the harddrive there will be some database of a linked-list of pages where in every moment up to 5 of them are loaded in the memory. On insertion, if some max-page-size was reached, the page will be splitted to 2 small pages, and on pointer increment, if a pointer is increased beyond its loaded page, the following page will be loaded instead. This is a good solution, but I don't have the time to write it, especially if I want to make it generic and implement all the python-list features. Using a SQL tables is not good either, since I'll need to implement a complex index-key mechanism. I tried ZODB and zc.blist, which implement a BTree based list that can be stored in a ZODB database file, but I don't know how to configure it so the above features will run in reasonable time. I don't need all the multi-threading\transactioning features. No one else will touch the database-file except for my single-thread program. Can anyone explain me how to configure the ZODB\zc.blist so the above features will run fast, or show me a different large-list implementation?

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  • How to delete columns?

    - by Joey jie
    Hi all, I have generated the following text file below: fe120b99164f151b28bf86afa6389b22 -rw-r--r-- 1 joey joey 186 2010-03-14 19:26 Descript.txt 41705ea936cfc653f273b5454c1cdde6 -rw-r--r-- 1 joey joey 30 2010-03-14 20:29 listof.txt 0e25cca3222d32fff43563465af03340 -rw-r--r-- 1 joey joey 28 2010-03-14 23:35 sedexample.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-02-16 15:11 test1.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-02-16 15:11 test2.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-02-16 15:11 test3.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-02-16 15:11 test4.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-02-16 15:11 test5.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-02-16 15:11 test6.txt f5c7f1856249d0526be10df5bd5b895a -rw-r--r-- 1 joey joey 26 2010-03-13 14:13 testingfile.txt d41d8cd98f00b204e9800998ecf8427e -rw-r--r-- 1 joey joey 0 2010-03-15 00:28 uniquelist.txt Basically I would like to get rid of the access, amount column, user and group columns. In other words, I want rid of columns 3,4,5. I have tried using cut to keep the columns that I do want and having " " as my delimiter however because of the file size figures, it messes up using "space" as a delimiter. Any advice would be much appreciated! Oh just to add, I would like to save the output as another text file. Many thanks!

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  • Plot in GNU PLOT

    - by guddi
    I have to plot many lines in GNU PLOT.No problem with the X axis. The problem that I am facing is that most of the plotted lines are at yscale [0-0.05] ,few at range 60-70 and rest at 600-700. These numbers correspond to the y axis scale values. But after I plot I can see only 3 sets of lines all messed up. There is no clearity between the lines. Line at 0 and the line at 0.003 look like one single line. If I set yrange[0:0.05], the lines between this range are clearly vissible. But I want all the lines in the same graph. I have heard of breaking axis's and multi plotting..Can they be useful? how to implement them. Anyone pls help me. Below is the sript set terminal png size 1300,1200 enhanced font 'Verdana,20 set output ' output .png’ set key font 'Verdana,16' set key bottom outside set yrange[500:1000] set xtics("25k" 25000,"50k" 50000,"75k" 75000,"100k" 100000) set grid set title 'Performance Metrics' set ylabel 'Metrices' set xlabel 'FES' plot ' input ' using 1:2 title ' A' with linespoints linewidth 4, ' input ' using 1:3 title B'with linespoints linewidth 4, 'input ' using 1:4 title ' c' with linespoints linewidth 4, 'input ' using 1:5 title 'D' with linespoints linewidth 4, ' input ' using 1:6 title 'E' with linespoints linewidth 4, ' input ' using 1:7 title 'F' with linespoints linewidth 4, ' input ' using 1:8 title 'G' with linespoints linewidth 4, ' input ' using 1:9 title ' H ' with linespoints linewidth 4, ' input ' using 1:10 title ' I' Metric ' with linespoints linewidth 4 set output set terminal windows input.dat is something like this: 25 0.002 0.05 899 455 444 0.08 0.00004 900 700 0.003 This way i have other rows. I have shown only the first one

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  • Does RabbitMq do round-robin from the exchange to the queues

    - by Lancelot
    Hi, I am currently evaluating message queue systems and RabbitMq seems like a good candidate, so I'm digging a little more into it. To give a little context I'm looking to have something like one exchange load balancing the message publishing to multiple queues. I don't want to replicate the messages, so a fanout exchange is not an option. Also the reason I'm thinking of having multiple queues vs one queue handling the round-robin w/ the consumers, is that I don't want our single point of failure to be at the queue level. Sounds like I could add some logic on the publisher side to simulate that behavior by editing the routing key and having the appropriate bindings in place. But that's kind of a passive approach that wouldn't take the pace of the message consumption on each queue into account, potentially leading to fill up one queue if the consumer applications for that queue are dead. I was looking for a more pro-active way from the exchange entity side, that would decide where to send the next message based on each queue size or something of that nature. I read about Alice and the available RESTful APIs but that seems kind of a heavy duty solution to implement fast routing decisions. Anyone knows if round-robin between the exchange the queues is feasible w/ RabbitMQ then? Thanks.

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  • Mimic CALayer shadow properties found in iPhone OS 3.2 for OS 3.1

    - by niblha
    The CALayer shadow properties like shadowOffset, shadowRadius, shadowColor are not available in iPhone OS versions below 3.2 and I'm wondering how I could mimic that functionality for use with 3.1 and below. I want to use this to be able to add drop shadows to UIViews in a clean way so that the shadows are drawn at layer level somehow, and not by drawing it in a view's -(void)drawRect:(CGRect)rect method which requires to shrink the actual views frame to accomodate for the shadow. (This shrinking approach have been proposed in the other UIView drop shadow related questions I found here on SO). I was thinking a layered approach would be cleaner. For example I tried creating subclassing CALayer to which I added a separate shadow layer as a sublayer, but then that would be drawn on top of whatever was draw in the drawRect: method of the UIView that had the main layer as backing layer. I've also tried implementing the subclass CALayer's drawInContext: something like this, - (void)drawInContext:(CGContextRef)ctx { // code to draw shadow for a frame the size of the layer's frame [super drawInContext:ctx]; } But then the shadow is still clipped to the current clipping bounding box of the context, which seems to be the layers own frame. I also had some idea of redirecting the drawing of the main layer to a sublayer, which would be placed above another sublayer which had the shadow drawn onto it. Then I would probably get rid of the clipping and the shadow would be farthest away. But I couldn't really wrap my head around how I would do that, and it doesn't really feel like a clean approach. Any ideas on how to go about this? Just to make clear how my UIView drop shadow related question is different from the other ones I found here on SO; I do not want to shrink the actual drawing frame of a UIView to accomodate for a shadow. I want it to somehow be on a separate layer in the background, whithout beeing clipped.

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  • How do I keep a CALayer, sublayer of a CATiledLayer, from changing it's scale after a zoom ?

    - by David
    I have a CATiledLayer that is used to display a PDF page (this CATiledLayer is the layer type of my UIView which is a subview of a UIScrollView). I want to add overlay markers on this page. So I add a sublayer to my CATiledLayer. This sublayer again hosts the different marker's layers and acts as a grouping layer. So graphically, I have: (keep in mind that I have multiple markers which are CALayers also, this is ascii art after all) pdf page (CATiledLayer) ---------------------- | CALayer | | +---------+ | | | +----+ | | | | |mker| | | | | +----+ | | | +---------+ | | | ---------------------- I have set up the canonical drawLayer:inContext: in my view for drawing the pdf. When I zoom to have more detail, the pdf gets rendered correctly, but the markers get scaled. No matter what I do to the bounds of the CALayer, my markers always become bigger and appear jagged. I would like to have the markers always the same size, as when they were initialized and first shown when the view was drawn. Is this possible ? or am I using a wrong approach ? Should I do special drawing for my contained CALayer in the drawLAyer:inContext: message ? As you see, there are things that I am missing to resolve my problem. Thank you for any help you provide.

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  • CSS Div Width Problem - Lining divs... widths seem to be off in IE7

    - by jlrolin
    So far, I'm doing this programmatically using VB.net/ASP.net: 'Create Container Div Dim ContainerDiv As New HtmlGenericControl("div") ContainerDiv.Style("width") = "100%" ContainerDiv.Style("clear") = "both" ContainerDiv.Style("text-align") = "left" ContainerDiv.Style("margin") = "0" 'Create Expand/Collapse Image Dim img As New Image img.ImageUrl = Page.ResolveUrl("~/images/minus99.jpg") img.Attributes.Add("onclick", "change(this.parent);") 'Create Company Display Dim lbl As New Label lbl.Text = Parsetext(pc.NAME) lbl.Font.Bold = True lbl.Style("font-size") = "16px" Dim NameDiv As New HtmlGenericControl("div") 'NameDiv.Style("background-color") = "#F0D3D3" NameDiv.Style("width") = "375px" NameDiv.Style("float") = "left" NameDiv.Style("margin") = "0" NameDiv.Style("display") = "block" NameDiv.Controls.Add(img) NameDiv.Controls.Add(lbl) ContainerDiv.Controls.Add(NameDiv) Dim SetupDiv As New HtmlGenericControl("div") SetupDiv.Style("background-color") = "#F0D3D3" SetupDiv.Style("width") = "210px" SetupDiv.Style("float") = "left" SetupDiv.Style("margin") = "0" SetupDiv.Style("display") = "block" 'SetupDiv.Style("position") = "fixed" ContainerDiv.Controls.Add(SetupDiv) Dim UsedDiv As New HtmlGenericControl("div") UsedDiv.Style("background-color") = "#CFF5CE" UsedDiv.Style("width") = "140px" UsedDiv.Style("float") = "left" UsedDiv.Style("margin") = "0" UsedDiv.Style("display") = "block" 'UsedDiv.Style("position") = "fixed" ContainerDiv.Controls.Add(UsedDiv) Dim RemDiv As New HtmlGenericControl("div") RemDiv.Style("background-color") = "#BEE0F7" 'RemDiv.Style("position") = "absolute" RemDiv.Style("width") = "210px" RemDiv.Style("float") = "right" RemDiv.Style("padding") = "0" RemDiv.Style("margin") = "0" RemDiv.Style("display") = "block" 'RemDiv.Style("position") = "fixed" ContainerDiv.Controls.Add(RemDiv) This should give me four DIVS inside a container DIV. Here's what it's coming out as: The correct blocks above the non-inline blocks are from a table with the same exact widths as the ones I'm using on the Divs. There isn't any CSS adding pixels to them, I don't think. I need to line these up, and I can't figure out where my problem is here. Any help would be appreciated.

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  • [C#]Problem with dynamic create tabPages in TabControl

    - by mirt
    Hello, I want to create dynamic tabPages in TabControl. In each tabPage I create dataGridView and i want to fill the entire space of each tabPage with this dataGrid. Here is code, where i do this: private void tabControlMutants_SelectedIndexChanged(object sender, EventArgs e) { DataGridView dgw = new DataGridView(); DataGridViewTextBoxColumn testCaseCol = new System.Windows.Forms.DataGridViewTextBoxColumn(); DataGridViewTextBoxColumn resultCol = new System.Windoows.Forms.DataGridViewTextBoxColumn(); // // dataGridView1 // dgw.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize; dgw.Columns.AddRange(new System.Windows.Forms.DataGridViewColumn[] { testCaseCol, resultCol}); dgw.Location = new System.Drawing.Point(3, 3); dgw.Name = "dataGridView1"; dgw.AutoSize = true; dgw.Dock = System.Windows.Forms.DockStyle.Fill; dgw.TabIndex = 0; // // TestCaseColumn // testCaseCol.AutoSizeMode = System.Windows.Forms.DataGridViewAutoSizeColumnMode.Fill; testCaseCol.HeaderText = "Test Case"; testCaseCol.Name = "TestCaseColumn"; // // ResultColumn // resultCol.HeaderText = "Result"; resultCol.Name = "ResultColumn"; tabControlMutants.TabPages[(sender as TabControl).SelectedIndex].Controls.Add(dgw); ((System.ComponentModel.ISupportInitialize)(dgw)).EndInit(); //fill dataGridView } But it doesn't work, becouse when i resize the main window, data gridView doesn.t change its size (although the dock property is set to fill). Any ideas?

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  • Handling mach exceptions in 64bit OS X application

    - by Brad S
    I have been able to register my own mach port to capture mach exceptions in my applications and it works beautifully when I target 32 bit. However when I target 64 bit, my exception handler catch_exception_raise() gets called but the array of exception codes that is passed to the handler are 32 bits wide. This is expected in a 32 bit build but not in 64 bit. In the case where I catch EXC_BAD_ACCESS the first code is the error number and the second code should be the address of the fault. Since the second code is 32 bits wide the high 32 bits of the 64 bit fault address is truncated. I found a flag in <mach/exception_types.h> I can pass in task_set_exception_ports() called MACH_EXCEPTION_CODES which from looking at the Darwin sources appears to control the size of the codes passed to the handler. It looks like it is meant to be ored with the behavior passed in to task_set_exception_ports(). However when I do this and trigger an exception, my mach port gets notified, I call exc_server() but my handler never gets called, and when the reply message is sent back to the kernel I get the default exception behavior. I am targeting the 10.6 SDK. I really wish apple would document this stuff better. Any one have any ideas?

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  • Production settings file for log4j?

    - by James
    Here is my current log4j settings file. Are these settings ideal for production use or is there something I should remove/tweak or change? I ask because I was getting all my threads being hung due to log4j blocking. I checked my open file descriptors I was only using 113. # ***** Set root logger level to WARN and its two appenders to stdout and R. log4j.rootLogger=warn, stdout, R # ***** stdout is set to be a ConsoleAppender. log4j.appender.stdout=org.apache.log4j.ConsoleAppender # ***** stdout uses PatternLayout. log4j.appender.stdout.layout=org.apache.log4j.PatternLayout # ***** Pattern to output the caller's file name and line number. log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n # ***** R is set to be a RollingFileAppender. log4j.appender.R=org.apache.log4j.RollingFileAppender log4j.appender.R.File=logs/myapp.log # ***** Max file size is set to 100KB log4j.appender.R.MaxFileSize=102400KB # ***** Keep one backup file log4j.appender.R.MaxBackupIndex=5 # ***** R uses PatternLayout. log4j.appender.R.layout=org.apache.log4j.PatternLayout log4j.appender.R.layout.ConversionPattern=%p %t %d %c - %m%n #set httpclient debug levels log4j.logger.org.apache.component=ERROR,stdout log4j.logger.httpclient.wire=ERROR,stdout log4j.logger.org.apache.commons.httpclient=ERROR,stdout log4j.logger.org.apache.http.client.protocol=ERROR,stdout UPDATE*** Adding thread dump sample from all my threads (100) "pool-1-thread-5" - Thread t@25 java.lang.Thread.State: BLOCKED on org.apache.log4j.spi.RootLogger@1d45a585 owned by: pool-1-thread-35 at org.apache.log4j.Category.callAppenders(Category.java:201) at org.apache.log4j.Category.forcedLog(Category.java:388) at org.apache.log4j.Category.error(Category.java:302)

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  • Did I find a bug in WriteableBitmap when using string literals

    - by liserdarts
    For performance reasons I'm converting a large list of images into a single image. This code does exactly what I want. Private Function FlattenControl(Control As UIElement) As Image Control.Measure(New Size(1000, 1000)) Control.Arrange(New Rect(0, 0, 1000, 1000)) Dim ImgSource As New Imaging.WriteableBitmap(1000, 1000) ImgSource.Render(Control, New TranslateTransform) ImgSource.Invalidate Dim Img As New Image Img.Source = ImgSource Return Img End Function I can add all the images into a canvas pass the canvas to this function and I get back one image. My code to load all the images looks like this. Public Function BuildTextures(Layer As GLEED2D.Layer) As FrameworkElement Dim Container As New Canvas For Each Item In Layer.Items If TypeOf Item Is GLEED2D.TextureItem Then Dim Texture = CType(Item, GLEED2D.TextureItem) Dim Url As New Uri(Texture.texture_filename, UriKind.Relative) Dim Img As New Image Img.Source = New Imaging.BitmapImage(Url) Container.Children.Add(Img) End If Next Return FlattenControl(Container) End Function The GLEED2D.Layer and GLEED2D.TextureItem classes are from the free level editor GLEED2D (http://www.gleed2d.de/). The texture_filename on every TextureItem is "Images/tree_clipart_pine_tree.png" This works just fine, but it's just a proof of concept. What I really need to do (among other things) is have the path to the image hard coded. If I replace Texture.texture_filename in the code above with the string literal "Images/tree_clipart_pine_tree.png" the images do not appear in the final merged image. I can add a breakpoint and see that the WriteableBitmap has all of it's pixels as 0 after the call to Invalidate. I have no idea how this could cause any sort of difference, but it gets stranger. If I remove the call to FlattenControl and just return the Canvas instead, the images are visible. It's only when I use the string literal with the WriableBitmap that the images do not appear. I promise you that the value in the texture_filename property is exactly "Images/tree_clipart_pine_tree.png". I'm using Silverlight 3 and I've also reproduced this in Silverlight 4. Any ideas?

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  • HTMLAgilitypack getting <P> and <STRONG> text

    - by StealthRT
    Hey all i am looking for a way to get this HTML code: <DIV class=channel_row><SPAN class=channel> <DIV class=logo><IMG src='/images/channel_logos/WGNAMER.png'></DIV> <P><STRONG>2</STRONG><BR>WGNAMER </P></SPAN> using the HtmlAgilityPack. I have been trying this: With channel info!Logo = .SelectSingleNode(".//img").Attributes("src").Value info!Channel = .SelectSingleNode(".//span[@class='channel']").ChildNodes(1).ChildNodes(0).InnerText info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(1).ChildNodes(2).InnerText End With I can get the Logo but it comes up with a blank string for the Channel and for the Station it says Index was out of range. Must be non-negative and less than the size of the collection. I've tried all types of combinations: info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(1).ChildNodes(1).InnerText info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(1).ChildNodes(3).InnerText info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(0).ChildNodes(1).InnerText info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(0).ChildNodes(2).InnerText info!Station = .SelectSingleNode(".//span[@class='channel']").ChildNodes(0).ChildNodes(3).InnerText What do i need to do in order to correct this?

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  • Keeping footer visible and height 100% in CSS

    - by vtortola
    I'm trying to create a very simple page that contains a container, a header, a left column and a footer: <containter> <header /> <content /> <leftBar /> <footer /> </containter> I want to use the 100% of the height, as I can do with the width, but I simply dont get it work.At his moment I'm usingmin-height, but how could I use theheight:100%` ? What I like is that the footer is always visible, and you scroll the content. Current CSS body { font-family: Verdana; font-size: 0.8em; background-color:#f1f1f1; } #container { border:solid 2px Black; position:absolute; left:10%; width:80%; margin:auto; } #header { height:20px; background: #DDDDDD; } #leftBar { width: 20%; background: #669966; min-height:600px; postion:absolute; top:20px; bottom:20px; } #content { float:right; background-color: #cdcde6; position:absolute; left:20%; right:0px; bottom:20px; top:20px; padding:5px; } #footer { position:absolute; height:20px; }

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  • AS3 "Loader" progress immediately goes to 100%

    - by Bart van Heukelom
    If you go to http://moederdagontbijtplacemat.nl/ you will see a progress bar. The application is loading a fairly large SWF from the server using the Loader class. Strangely enough, the progress bar immediately goes to 100% (but the loading still takes a while after that). The code is below, but you'll see it's basically too simple to break. It has worked when the application was on a different server, so I though maybe the new server wasn't sending the size of the large SWF in the http headers. Firebug does show a progress bar though, so that is not the case, the information should be available. It also works when I run the loader swf locally and change the URL (new URLRequest("Placemat.swf")) to the absolute URL of Placemat.swf on the server. var l:Loader = new Loader(); addChild(l); l.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, function(e:ProgressEvent) { s.setProgress(e.bytesLoaded/e.bytesTotal); trace(Math.round(100 * e.bytesLoaded/e.bytesTotal), "%"); }); l.contentLoaderInfo.addEventListener(Event.COMPLETE, function() { removeChild(s); }); l.load(new URLRequest("Placemat.swf"));

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  • high performance hibernate insert

    - by luke
    I am working on a latency sensitive part of an application, basically i will receive a network event transform the data and then insert all the data into the DB. After profiling i see that basically all my time is spent trying to save the data. here is the code private void insertAllData(Collection<Data> dataItems) { long start_time = System.currentTimeMillis(); long save_time = 0; long commit_time = 0; Transaction tx = null; try { Session s = HibernateSessionFactory.getSession(); s.setCacheMode(CacheMode.IGNORE); s.setFlushMode(FlushMode.NEVER); tx = s.beginTransaction(); for(Data data : dataItems) { s.saveOrUpdate(data); } save_time = System.currentTimeMillis(); tx.commit(); s.flush(); s.clear(); } catch(HibernateException ex) { if(tx != null) tx.rollback(); } commit_time = System.currentTimeMillis(); System.out.println("Save: " + (save_time - start_time)); System.out.println("Commit: " + (commit_time - save_time)); System.out.println(); } The size of the collection is always less than 20. here is the timing data that i see: Save: 27 Commit: 9 Save: 27 Commit: 9 Save: 26 Commit: 9 Save: 36 Commit: 9 Save: 44 Commit: 0 This is confusing to me. I figure that the save should be quick and all the time should be spent on commit. but clearly I'm wrong. I have also tried removing the transaction (its not really necessary) but i saw worse times... I have set hibernate.jdbc.batch_size=20... i need this operation to be as fast as possible, ideally there would only be one roundtrip to the database. How can i do this?

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  • How to Create PDF from HTML using perl

    - by Octopus
    I need to create a PDF file from the html I have created usign rrdcgi. This page contains the details and graphs in png format. I have written the below code using perl module HTML::HTMLDoc to create a pdf file using saved html file. The images are of size width 1048 and hight 266 but when creating a pdf file the images are not shown completly from the right side. #!/usr/bin/perl use strict; use warnings; use HTML::HTMLDoc; my $filename = shift; my $htmldoc = new HTML::HTMLDoc(); $htmldoc->set_input_file($filename); $htmldoc->no_links(); $htmldoc->landscape(); $htmldoc->set_jpeg_compression('50'); $htmldoc->best_image_quality(); $htmldoc->color_on(); $htmldoc->set_right_margin('1', 'mm'); $htmldoc->set_left_margin('1', 'mm'); $htmldoc->set_bodycolor('#FFFFFF'); $htmldoc->set_browserwidth('1000'); my $pdf = $htmldoc->generate_pdf(); print $pdf->to_string(); $pdf->to_file('foo.pdf'); I need help on following items: 1) How to display the complete image on page. 2) How to set a link on html page to create pdf file with the contents on the current page. Any help with the perl code would be really appreciated.

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  • Binary stream 'NN' does not contain a valid BinaryHeader. Possible causes are invalid stream or obje

    - by FinancialRadDeveloper
    I am passing user defined classes over sockets. The SendObject code is below. It works on my local machine, but when I publish to the WebServer which is then communicating with the App Server on my own machine it fails. public bool SendObject(Object obj, ref string sErrMsg) { try { MemoryStream ms = new MemoryStream(); BinaryFormatter bf1 = new BinaryFormatter(); bf1.Serialize(ms, obj); byte[] byArr = ms.ToArray(); int len = byArr.Length; m_socClient.Send(byArr); return true; } catch (Exception e) { sErrMsg = "SendObject Error: " + e.Message; return false; } } I can do this fine if it is one class in my tools project and the other class about UserData just doesn't want to know. Frustrating! Ohh. I think its because the UserData class has a DataSet inside it. Funnily enough I have seen this work, but then after 1 request it goes loopy and I can't get it to work again. Anyone know why this might be? I have looked at comparing the dlls to make sure they are the same on the WebServer and on my local machine and they look to be so as I have turned on versioning in the AssemblyInfo.cs to double check. Edit: Ok it seems that the problem is with size. If I keep it under 1024 byes ( I am guessing here) it works on the web server and doesnt if it has a DataSet inside it.k In fact this is so puzzling I converted the DataSet to a string using ds.GetXml() and this also causes it to blow up. :( So it seems that across the network something with my sockets is wrong and doesn't want to read in the data. JonSkeet where are you. ha ha. I would offer Rep but I don't have any. Grr

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  • Making pascal's triangle with mpz_t's

    - by SDLFunTimes
    Hey, I'm trying to convert a function I wrote to generate an array of longs that respresents Pascal's triangles into a function that returns an array of mpz_t's. However with the following code: mpz_t* make_triangle(int rows, int* count) { //compute triangle size using 1 + 2 + 3 + ... n = n(n + 1) / 2 *count = (rows * (rows + 1)) / 2; mpz_t* triangle = malloc((*count) * sizeof(mpz_t)); //fill in first two rows mpz_t one; mpz_init(one); mpz_set_si(one, 1); triangle[0] = one; triangle[1] = one; triangle[2] = one; int nums_to_fill = 1; int position = 3; int last_row_pos; int r, i; for(r = 3; r <= rows; r++) { //left most side triangle[position] = one; position++; //inner numbers mpz_t new_num; mpz_init(new_num); last_row_pos = ((r - 1) * (r - 2)) / 2; for(i = 0; i < nums_to_fill; i++) { mpz_add(new_num, triangle[last_row_pos + i], triangle[last_row_pos + i + 1]); triangle[position] = new_num; mpz_clear(new_num); position++; } nums_to_fill++; //right most side triangle[position] = one; position++; } return triangle; } I'm getting errors saying: incompatible types in assignment for all lines where a position in the triangle is being set (i.e.: triangle[position] = one;). Does anyone know what I might be doing wrong?

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  • UItextfield text alignment issue in cocos2D iPhone

    - by shreya
    Hi All, Please take a look of the following screen shot. Here is my code, I am using cocos2D CGAffineTransform transform = CGAffineTransformMakeRotation(3.14159/2); _view = [[CCDirector sharedDirector]openGLView]; // Input the user name _nameField = [[UITextField alloc]initWithFrame:CGRectMake(130.0, 270.0, 200.0, 30.0)]; _nameField.transform = transform; _nameField.adjustsFontSizeToFitWidth = YES; _nameField.textColor = [UIColor blackColor]; [_nameField setFont:[UIFont fontWithName:@"Arial" size:14]]; _nameField.placeholder = @"<Enter Your Name>"; _nameField.backgroundColor = [UIColor clearColor]; _nameField.autocorrectionType = UITextAutocorrectionTypeNo; _nameField.autocapitalizationType = UITextAutocapitalizationTypeAllCharacters; _nameField.textAlignment = UITextAlignmentCenter; _nameField.keyboardType = UIKeyboardTypeDefault; _nameField.returnKeyType = UIReturnKeyDone; _nameField.tag = 0; _nameField.delegate = self; _nameField.clearButtonMode = UITextFieldViewModeNever; _nameField.borderStyle = UITextBorderStyleRoundedRect; [_view addSubview:_nameField]; The problem is the text is typing on the top of the text field. I want it to be in the middle not to top.

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  • Subview of custom NSView is resizing itself to fit within its superview

    - by Jonathan Patt
    I have a custom NSView which contains a subview—for the purposes of solving this issue, the top level view is simply acting as a container and automatically resizes to fit within the window. Its subview draws a rectangle 10 pixels inset from the edge of the window, except for the bottom, which should get clipped by the window until it's resized to show the entire rectangle. It does not, however, behave as I intend, and instead shrinks the height of the rectangle when its superview has a smaller height than it does. How do I avoid this and have it stay at its proper height and instead get clipped when the superview is smaller? The parent view's implementation code is: - (id)initWithFrame:(NSRect)frameRect { self = [super initWithFrame:frameRect]; if (self) { subView = [[SubView alloc] initWithFrame:frameRect]; } return self; } - (void)drawRect:(NSRect)dirtyRect { [[NSColor grayColor] set]; [subView setFrame:NSMakeRect(10, 10, dirtyRect.size.width - 20, 500)]; [self addSubview:subView]; } - (BOOL)isFlipped { return YES; } And the subview is just: - (void)drawRect:(NSRect)dirtyRect { [[NSColor blackColor] set]; [NSBezierPath strokeRect:dirtyRect]; } - (BOOL)isFlipped { return YES; }

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  • Android: Nexus One - Geocoder causes IOException - works perfectly with other devices and emulator

    - by Stefan Klumpp
    The code below works perfectly for real devices running on 1.5, 1.6 and 2.0 as well as the emulator running on 2.1. However, executing it on the Nexus One (running 2.1) raises an IOException: java.io.IOException: Unable to parse response from server at android.location.Geocoder.getFromLocation(Geocoder.java:124) That's the code snippet where it happens: Double myLatitude = AppObject.myLocation.getLatitude(); Double myLongitude = AppObject.myLocation.getLongitude(); DEBUG.i(TAG, "My location: " + myLatitude + " | " + myLongitude); Geocoder geocoder = new Geocoder(MainActivity.this); java.util.List<Address> addressList; try { addressList = geocoder.getFromLocation(myLatitude, myLongitude, 5); if(addressList!=null && addressList.size()>0) { currentAddress = new String(); DEBUG.i(TAG,addressList.get(0).toString()); currentAddress = addressList.get(0).getAddressLine(0) + ", " + addressList.get(0).getAddressLine(1) + ", " + addressList.get(0).getAddressLine(2); } return true; } catch (IOException e) { e.printStackTrace(); return false; }

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  • iPhone - is it IMPOSSIBLE to grab the contents of a CALayers composition?

    - by Mike
    I have a CALayer transformed in 3D on a offscreen UIView (much larger than 320x480). How do I dump what is seen on this UIView to a UIImage? NOTE: I Have edited the question to include this code... This is how I create the layer... CGRect area = CGRectMake (0,0,400,600]; vista3D = [[UIView alloc] initWithFrame:area ]; [self.view addSubview:vista3D]; [vista3D release]; transformed = [CALayer layer]; transformed.frame = area; [vista3D.layer addSublayer:transformed]; CALayer *imageLayer = [CALayer layer]; imageLayer.doubleSided = YES; imageLayer.frame = area; imageLayer.transform = CATransform3DMakeRotation(40 * M_PI / 180.0f, 1.0f, 0.0f, 0.0f); imageLayer.contents = (id)myRawImage.CGImage; [transformed addSublayer:imageLayer]; // Add a perspective effect CATransform3D initialTransform = transformed.sublayerTransform; initialTransform.m34 = 1.0 / -500; transformed.sublayerTransform = initialTransform; // now the layer is in perspective // my next step is to "flatten" the composition into a UIImage UIImage *thisIsTheResult = some magic command thanks for any help! EDIT 1: I have tried jessecurry solution but it gives me a flat layer without any perspective. EDIT 2: I discovered a partial solution for this that works, but this solution gives me an image the size of the screen and I was looking for obtaining a higher resolution version, rendering off screen.

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  • The subsets-sum problem and the solvability of NP-complete problems

    - by G.E.M.
    I was reading about the subset-sums problem when I came up with what appears to be a general-purpose algorithm for solving it: (defun subset-contains-sum (set sum) (let ((subsets) (new-subset) (new-sum)) (dolist (element set) (dolist (subset-sum subsets) (setf new-subset (cons element (car subset-sum))) (setf new-sum (+ element (cdr subset-sum))) (if (= new-sum sum) (return-from subset-contains-sum new-subset)) (setf subsets (cons (cons new-subset new-sum) subsets))) (setf subsets (cons (cons element element) subsets))))) "set" is a list not containing duplicates and "sum" is the sum to search subsets for. "subsets" is a list of cons cells where the "car" is a subset list and the "cdr" is the sum of that subset. New subsets are created from old ones in O(1) time by just cons'ing the element to the front. I am not sure what the runtime complexity of it is, but appears that with each element "sum" grows by, the size of "subsets" doubles, plus one, so it appears to me to at least be quadratic. I am posting this because my impression before was that NP-complete problems tend to be intractable and that the best one can usually hope for is a heuristic, but this appears to be a general-purpose solution that will, assuming you have the CPU cycles, always give you the correct answer. How many other NP-complete problems can be solved like this one?

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