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  • How to calculate shot angle and velocity to hit a moving target?

    - by Guen
    I am developing a 2D Android game and I am making an aiming algorithm for AI projectiles to hit enemies either following a path, or free moving. At the moment it just calculates where the target will be after a distance and fires a projectile to meet it at that distance. Of course this means varying the projectile speed to meet the target. Does anyone have any tips for a simple-ish algorithm (optimal-ish) to calculate when the projectile needs to fire and where it needs to aim if it can only travel at a constant velocity? Say the projectile goes twice the speed of the target? The only way I can think of involves searching and seems quite large.

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  • Google indexing pages with #! although we don't have any

    - by Benjamin Gruenbaum
    Our company has developed a Single Page Application using AngularJS and its routing. Google indexed our site decently with JavaScript but it did not index some pages very well so we have developed an HTML only version. We have followed the Ajax Crawling Specification posted here and have a <meta name='fragment' content='!'> tag and canonical urls. We expect http://www.example.com/foo/bar to be fetched from http://www.example.com/?_escaped_fragment_=/foo/bar. However, we have found out that when we rolled the AJAX specification we now have all pages indexed twice, once with the JavaScript version as http://www.example.com/foo/bar and once with the new version as http://www.example.com/#!/foo/bar. This is harmful to us since it's duplicate content and also mis-representing out site. I have tried looking for similar questions here and in the Google product forum but could not come up with anything.

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  • Relationship between databases [closed]

    - by user1525474
    Hi I am getting ready to create my first web aplication.I have some knowledge of databases but I have never used databases with relationship created beetween them and also I am not sure how to acces the data in the relationship.My experience is limited to basic CRUD applications and working on simple tables with no realtionship using PHP and MySql. For example I will be creating a login system and for each user I would like to create a profile page that store different data(name , address , profile image etc.).Some of the info will be the same in both tables so there is no point in creating the same table twice. What I would like is if anyone can tell of some tutorials so I can better understand the concept?

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  • Spurious resets on Ubuntu

    - by boone2048
    I have a PC running Ubuntu 13.04 64bit, and I do weekly updates, so everything should be up-to-date. Everything is running fine, but sometimes, once-twice a week a complete reset happens. I think it must be software or hardware (perhaps Videocard) related, but I can't figure out what could be wrong. Can anybody suggest some ways, log files, where I could continue to search? By looking just at dmesg/dmesg.0 and Xorg.0.log I got nowhere. I cant find even a user application segfault. Any help is really appreciated.

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  • Kworker consuming %100 CPU

    - by yusuf
    I have a process, named kworker which is continuously consuming 100% of the CPU's computing capacity. I have tried several possible solutions over a period of 3 months, but to no avail. I even got to upgrade to u + 1 (Ubuntu 12.10 Quantal Quetzal), but my effort was, again, fruitless. I desperately need some help, because, as is, this process is draining my computer's battery so fast, that makes linux usage a disappointing experience. It is noteworthy, that I do not have any such issues when I use windows, which results in twice as much battery life.

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  • Where is meta.local_fields set in django.db.models.base.py ?

    - by BryanWheelock
    I'm getting the error: Exception Value: (1110, "Column 'about' specified twice") As I was reviewing the Django error page, I noticed that the customizations the model User, seem to be appended to the List twice. This seems to be happening here in django/db/model/base.py in base_save(): values = [(f, f.get_db_prep_save(raw and getattr(self, f.attname) or f.pre_save(self, True))) for f in meta.local_fields] this is what Django error page shows values to be: values = [(<django.db.models.fields.CharField object at 0xa78996c>, u'kallie'), (<django.db.models.fields.CharField object at 0xa7899cc>, ''), (<django.db.models.fields.CharField object at 0xa789a2c>, ''), (<django.db.models.fields.EmailField object at 0xa789a8c>, u'[email protected]'), (<django.db.models.fields.CharField object at 0xa789b2c>, 'sha1$d4a80$0e5xxxxxxxxxxxxxxxxxxxxddadfb07'), (<django.db.models.fields.BooleanField object at 0xa789bcc>, False), (<django.db.models.fields.BooleanField object at 0xa789c6c>, True), (<django.db.models.fields.BooleanField object at 0xa789d2c>, False), (<django.db.models.fields.DateTimeField object at 0xa789dcc>, u'2010-02-03 14:54:35'), (<django.db.models.fields.DateTimeField object at 0xa789e2c>, u'2010-02-03 14:54:35'), # this is where the values from the User model customizations show up (<django.db.models.fields.BooleanField object at 0xa8c69ac>, False), (<django.db.models.fields.CharField object at 0xa8c688c>, None), (<django.db.models.fields.PositiveIntegerField object at 0xa8c69cc>, 1), (<django.db.models.fields.CharField object at 0xa8c69ec>, 'b5ab1603b2308xxxxxxxxxxx75bca1'), (<django.db.models.fields.SmallIntegerField object at 0xa8c6dac>, 0), (<django.db.models.fields.SmallIntegerField object at 0xa8c6e4c>, 0), (<django.db.models.fields.SmallIntegerField object at 0xa8c6e8c>, 0), (<django.db.models.fields.SmallIntegerField object at 0xa8c6ecc>, 10), (<django.db.models.fields.DateTimeField object at 0xa8c6eec>, u'2010-02-03 14:54:35'), (<django.db.models.fields.CharField object at 0xa8c6f2c>, ''), (<django.db.models.fields.URLField object at 0xa8c6f6c>, ''), (<django.db.models.fields.CharField object at 0xa8c6fac>, ''), (<django.db.models.fields.DateField object at 0xa8c6fec>, None), (<django.db.models.fields.TextField object at 0xa8cb04c>, ''), # at this point User model customizations repeats itself (<django.db.models.fields.BooleanField object at 0xa663b0c>, False), (<django.db.models.fields.CharField object at 0xaa1e94c>, None), (<django.db.models.fields.PositiveIntegerField object at 0xaa1e34c>, 1), (<django.db.models.fields.CharField object at 0xaa1e40c>, 'b5ab1603b2308050ebd62f49ca75bca1'), (<django.db.models.fields.SmallIntegerField object at 0xa8c6d8c>, 0), (<django.db.models.fields.SmallIntegerField object at 0xaa2378c>, 0), (<django.db.models.fields.SmallIntegerField object at 0xaa237ac>, 0), (<django.db.models.fields.SmallIntegerField object at 0xaa237ec>, 10), (<django.db.models.fields.DateTimeField object at 0xaa2380c>, u'2010-02-03 14:54:35'), (<django.db.models.fields.CharField object at 0xaa2384c>, ''), (<django.db.models.fields.URLField object at 0xaa2388c>, ''), (<django.db.models.fields.CharField object at 0xaa238cc>, ''), (<django.db.models.fields.DateField object at 0xaa2390c>, None), (<django.db.models.fields.TextField object at 0xaa2394c>, '')] Since this app is in Production, I can't figure out how to use pdb.set_trace() to see what's going on inside of save_base. The customizations to User are: User.add_to_class('email_isvalid', models.BooleanField(default=False)) User.add_to_class('email_key', models.CharField(max_length=16, null=True)) User.add_to_class('reputation', models.PositiveIntegerField(default=1)) User.add_to_class('gravatar', models.CharField(max_length=32)) User.add_to_class('email_feeds', generic.GenericRelation(EmailFeed)) User.add_to_class('favorite_questions', models.ManyToManyField(Question, through=FavoriteQuestion, related_name='favorited_by')) User.add_to_class('badges', models.ManyToManyField(Badge, through=Award, related_name='awarded_to')) User.add_to_class('gold', models.SmallIntegerField(default=0)) User.add_to_class('silver', models.SmallIntegerField(default=0)) User.add_to_class('bronze', models.SmallIntegerField(default=0)) User.add_to_class('questions_per_page', models.SmallIntegerField(choices=QUESTIONS_PER_PAGE_CHOICES, default=10)) User.add_to_class('last_seen', models.DateTimeField(default=datetime.datetime.now)) User.add_to_class('real_name', models.CharField(max_length=100, blank=True)) User.add_to_class('website', models.URLField(max_length=200, blank=True)) User.add_to_class('location', models.CharField(max_length=100, blank=True)) User.add_to_class('date_of_birth', models.DateField(null=True, blank=True)) User.add_to_class('about', models.TextField(blank=True)) Django1.1.1 Python 2.5

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  • How do you code against CSRF malicious requests?

    - by user355950
    how to Decline malicious requests.... Cross-Site Request Forgery Severity: Medium Test Type: Application Remediation Tasks: Decline malicious requests Reasoning: The same request was sent twice in different sessions and the same response was received. This shows that none of the parameters are dynamic (session identifiers are sent only in cookies) and therefore that the application is vulnerable to this issue.

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  • Prevent recursive CTE visiting nodes multiple times

    - by bacar
    Consider the following simple DAG: 1->2->3->4 And a table, #bar, describing this (I'm using SQL Server 2005): parent_id child_id 1 2 2 3 3 4 //... other edges, not connected to the subgraph above Now imagine that I have some other arbitrary criteria that select the first and last edges, i.e. 1-2 and 3-4. I want to use these to find the rest of my graph. I can write a recursive CTE as follows (I'm using terminology from MSDN): with foo(parent_id,child_id) as ( // anchor member that happens to select first and last edges: select parent_id,child_id from #bar where parent_id in (1,3) union all // recursive member: select #bar.* from #bar join foo on #bar.parent_id = foo.child_id ) select parent_id,child_id from foo However, this results in edge 3-4 being selected twice: parent_id child_id 1 2 3 4 2 3 3 4 // 2nd appearance! How can I prevent the query from recursing into subgraphs that have already been described? I could achieve this if, in my "recursive member" part of the query, I could reference all data that has been retrieved by the recursive CTE so far (and supply a predicate indicating in the recursive member excluding nodes already visited). However, I think I can access data that was returned by the last iteration of the recursive member only. This will not scale well when there is a lot of such repetition. Is there a way of preventing this unnecessary additional recursion? Note that I could use "select distinct" in the last line of my statement to achieve the desired results, but this seems to be applied after all the (repeated) recursion is done, so I don't think this is an ideal solution. Edit - hainstech suggests stopping recursion by adding a predicate to exclude recursing down paths that were explicitly in the starting set, i.e. recurse only where foo.child_id not in (1,3). That works for the case above only because it simple - all the repeated sections begin within the anchor set of nodes. It doesn't solve the general case where they may not be. e.g., consider adding edges 1-4 and 4-5 to the above set. Edge 4-5 will be captured twice, even with the suggested predicate. :(

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  • Tim Heuer's editable combobox and tab stops

    - by Vinzz
    I'm using Tim Heuer's editable combo box in one of my Silverlight 3 projects and it works rather well. This control has an issue with tab stops though, that I don't understand yet... You have to hit tab twice so as to move to the next item. Did anyone manage to make this control support tabstops?

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  • PDF thumbnails in TeXShop (LaTeX)

    - by joec
    How can i create PDF thumbnails in TeXShop using LaTeX and thumbpdf? I have \usepackage{thumbpdf} in my preamble, ran LaTeX twice, ran $ thumbpdf report.pdf from a Terminal (I'm on a Mac), then ran LaTeX again, but the PDF has no thumbnails? Am I missing a step? The thumbpdf command created png files but then deleted them again, and wrote a file called report.tpt. Thanks.

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  • Using Android SAXParser, one my my XML Elements is mysteriously breaking in half.

    - by Drennen
    And its not '&' Im using the SAXParser object do parse the actual XML. This is normally done by passing a URL to the XMLReader.Parse method. Because my XML is coming from a POST request to a webservice, I am saving that result as a String and then employing StringReader / InputSource to feed this string back to the XMLReader.Parse method. However, something strange is happening at the 2001st character of the XMLstring. The 'characters' method of the document handler is being called TWICE in between the startElement and endElement methods, effectively breaking my string (in this case a project title) into two pieces. Because I am instantiating objects in my characters method, I am getting two objects instead of one. This line, about 2000 chars into the string fires 'characters' two times, breaking between "Lower" and "Level" <title>SUMC-BOOKSTORE, LOWER LEVEL RENOVATIONS</title> When I bypass the StringReader / InputSource workaround and feed a flat XML file to XMLReader.Parse, it works absolutely fine. Something about StringReader and or InputSource is somehow screwing this up. Here is my method that takes and XML string and parses is through the SAXParser. public void parseXML(String XMLstring) { try { SAXParserFactory spf = SAXParserFactory.newInstance(); SAXParser sp = spf.newSAXParser(); XMLReader xr = sp.getXMLReader(); xr.setContentHandler(this); // Something is happening in the StringReader or InputSource // That cuts the XML element in half at the 2001 character mark. StringReader sr = new StringReader(XMLstring); InputSource is = new InputSource(sr); xr.parse(is); } catch (IOException e) { Log.e("CMS1", e.toString()); } catch (SAXException e) { Log.e("CMS2", e.toString()); } catch (ParserConfigurationException e) { Log.e("CMS3", e.toString()); } } I would greatly appreciate any ideas on how to not have 'characters' firing off twice when I get to this point in the XML String. Or, show me how to use a POST request and still pass off the URL to the Parse function. THANK YOU.

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  • Android: Scrolling an Imageview

    - by luca
    I have an ImageView that is twice the height of a normale screen ( 960 dip). I would like to scroll it nicely up and down on the screen. The bottom of the screen should contain a bottom. I have tried various combinations of ScrollView and Imageviews without any success. I have also thinkered with the :isScrollContainer attribute without results. Anyone knows how to do this? Cheers, Luca

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  • Fact or fiction: Webkit’s rendering performance is much lower when used in Qt

    - by Jen
    Using Qt’s Webkit implementation renders much slower than directly implementing the Webkit engine -- is this true or just a myth? From my own experience, I found the load time of a complex page about twice as long in Qt’s “Fancy Browser” example as it does in Google Chrome (which also incorporates a port of Webkit), but I hardly think that is a fair comparison. Any insights on this?

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  • iPhone virtual keyboard bug

    - by Chandan Shetty SP
    In iPhone virtual keyboard... 1.Change the alphabetical keypad view to numerical view. 2.Tap on the single quote(') button the view changes to alphabetical. 3.In this view tapping on space twice displays a fullstop. I don't know whether it is apple bug or feature, How to fix this issue through coding? Thanks,

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  • assert fact into file in prolog

    - by smile
    Hello everyone, How can I assert a fact into a file without deleting the previous fact? In the following line, when I execute it twice, the second fact overwrites the first fact: tell('animal.txt'),write(Animal),nl,told. But when I use assert or assertz it will do nothing. Help me please. Thank you :)

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  • Issues dismissing keyboard conditionally

    - by Chris
    I have an app that has a username and password field. I want to validate the input before the the user is allowed to stop editing the field. To do that, I'm using the textFieldShouldEndEditing delegate method. If the input doesn't validate I display a UIAlertView. This approach works as advertised - the user cannot leave the field if the input doesn't validate. To have the done button on the keyboard dismiss the keyboard, I call resignFirstResponder on the textfield. The issue I have is the alert is being called twice. How do I keep the alert from showing twice? edit for clarification What is happening is that the alert appears, then another alert appears. I then have to dismiss both windows to fix the input. Here is the textFieldShouldEndEditing method -(BOOL)textFieldShouldEndEditing:(UITextField *)textField { NSLog(@"function called %@",textField); if([textField.text length] == 0) { return YES; } if(textField == userName) { if([self userNameValidated:textField.text]) { NSLog(@"name validated"); NSString *tempDonerName = [[NSString alloc] initWithString:(@"%@",userName.text)]; //[[NSUserDefaults standardUserDefaults] setObject:tempDonerName forKey:@"name"]; [tempDonerName release]; return YES; } else { NSLog(@"name did not validate"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Invalid Username",@"Invalid Username title") message:NSLocalizedString(@"Please make sure there are no apostrophes,spaces in the username, and that the username is less than 12 characters",@"Invalid username message") delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",@"OK Text") otherButtonTitles:nil]; [alert show]; [alert release]; return NO; } } else if (textField == userPin) { if([self userPinValidated:textField.text]) { NSLog(@"pin validated"); //NSString *tempDonerPin = [[NSString alloc] initWithString:(@"%@",userPin.text)]; //[[NSUserDefaults standardUserDefaults] setObject:tempDonerPin forKey:@"pin"]; //[tempDonerPin release]; return YES; } else { NSLog(@"pin did not validate"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Invalid Password",@"Invalid Pin title") message:NSLocalizedString(@"Please make sure there are no apostrophes in the password",@"Invalid password message") delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",@"OK Text") otherButtonTitles:nil]; [alert show]; [alert release]; return NO; } }else { NSLog(@"code validate - shouldn't get called"); return YES; } }

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  • MySQL query from subquery not working

    - by James Goodwin
    I am trying to return a number based on the count of results from a table and to avoid having to count the results twice in the IF statement I am using a subquery. However I get a syntax error when trying to run the query, the subquery I have tested by itself runs fine. Any ideas what is wrong with the query? The syntax looks correct to me SELECT IF(daily_count>8000,0,IF(daily_count>6000,1,2)) FROM ( SELECT count(*) as daily_count FROM orders201003 WHERE DATE_FORMAT(date_sub(curdate(), INTERVAL 1 DAY),"%d-%m-%y") = DATE_FORMAT(reqDate,"%d-%m-%y") ) q

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  • Exception Specification

    - by atch
    Hi, guys I know that this feature will be depracated in c++0x, but for me as a total novice it seems like a good idea to have it. Could anyone explain to me why isn't a good idea? Thanks in advance. P.S. I know I've said it but I'll say it again: formating in this forum really pisses me off. Why can't I have ENTER as end of line but instead of I have to press space twice?

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  • Determine duplicate record for duplicate and non-duplicate records

    - by gibboo
    I have a files containing both duplicate and non-duplicate records. The file is already sorted by a key. I want to determine those records that are duplicate and records that are non-duplicate. If duplicate the record is moved to a duplicate file and if non-duplicate that will be moved to valid file. I am using COBOL, and occurence of records for duplicate and non-duplicate is more than twice.

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  • Is it possible to override List accessors in Grails domain classes?

    - by Ali G
    If I have a List in a Grails domain class, is there a way to override the addX() and removeX() accessors to it? In the following example, I'd expect MyObject.addThing(String) to be called twice. In fact, the output is: Adding thing: thing 2 class MyObject { static hasMany = [things: String] List things = [] void addThing(String newThing) { println "Adding thing: ${newThing}" things << newThing } } class BootStrap { def init = { servletContext -> MyObject o = new MyObject().save() o.things << 'thing 1' o.addThing('thing 2') } def destroy = { } }

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  • abstract data type list. . .

    - by aldrin
    A LIST is an ordered collection of items where items may be inserted anywhere in the list. Implement a LIST using an array as follows: struct list { int *items; // pointer to the array int size; // actual size of the array int count; // number of items in the array }; typedef struct list *List; // pointer to the structure Implement the following functions: a) List newList(int size); - will create a new List and return its pointer. Allocate space for the structure, allocate space for the array, then initialize size and count, return the pointer. b) void isEmpty(List list); c) void display(List list); d) int contains(List list, int item); e) void remove(List list, int i) ; f) void insertAfter(List list,int item, int i); g) void addEnd(List list,int item) - add item at the end of the list – simply store the data at position count, then increment count. If the array is full, allocate an array twice as big as the original. count = 5 size = 10 0 1 2 3 4 5 6 7 8 9 5 10 15 20 30 addEnd(list,40) will result to count = 6 size = 10 0 1 2 3 4 5 6 7 8 9 5 10 15 20 30 40 h) void addFront(List list,int item) - shift all elements to the right so that the item can be placed at position 0, then increment count. Bonus: if the array is full, allocate an array twice as big as the original. count = 5 size = 10 0 1 2 3 4 5 6 7 8 9 5 10 15 20 30 addFront(list,40) will result to count = 6 size = 10 0 1 2 3 4 5 6 7 8 9 40 5 10 15 20 30 i) void removeFront(List list) - shift all elements to the left and decrement count; count = 6 size = 10 0 1 2 3 4 5 6 7 8 9 40 5 10 15 20 30 removeFront(list) will result to count = 5 size = 10 0 1 2 3 4 5 6 7 8 9 5 10 15 20 30 j) void remove(List list,int item) - get the index of the item in the list and then shift all elements to the count = 6 size = 10 0 1 2 3 4 5 6 7 8 9 40 5 10 15 20 30 remove(list,10) will result to count = 5 size = 10 0 1 2 3 4 5 6 7 8 9 40 5 15 20 30

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  • Can't change UITableViewCell size in Interface Builder

    - by Ondrej
    Does anyone have the same problem as I do? ... I've upgraded to the iPhone SDK 3.2 and I am unable to resize UITableViewCell object in my XIB file (usually I've been just resizing the view but now the cell has the same size and there is just a grey are around) ... btw, I've tried to reinstall twice including one deep reinstall.

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