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• Why do I not get low memory issues until images are draw on the screen?

  - by maxpower

  I am able to load over 200 UIImage objects into a NSMutableDictionary without any memorry warning issues. When I start displaying them on the screen (after about showing 10-20 images) I get low memory warnings and an eventual crash. Only about 8 images are displayed at anyone time. Does it take additional memory to actually draw a UIImage on the screen? No memory leaks are showing up and i've reviewed code for leaks many many times.

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• Does the order of columns in a query matter?

  - by James Simpson

  When selecting columns from a MySQL table, is performance affected by the order that you select the columns as compared to their order in the table (not considering indexes that may cover the columns)? For example, you have a table with rows uid, name, bday, and you have the following query. SELECT uid, name, bday FROM table Does MySQL see the following query any differently and thus cause any sort of performance hit? SELECT uid, bday, name FROM table

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• Is it safe to draw three separate QImages in three separate QThreads?

  - by yan bellavance

  I have a QMainWindow with three widgets inside that are promoted to a class containing a subclassed QThread. They each draw on a local QImage in their rexpective qthread which is sent with a signal once its drawn and then rendered by calling update (mandlebrot example) from the slot. Is this safe or dangerous? They do not share any data, at least none that I am generating and am wondering what data they could be sharing that is outside of my coding range ie that is generated by Qt automatically.

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• Will the Order of my Associative Array be maintained from PHP to Javascript?

  - by Colin

  In PHP I'm running a mysql_query that has an ORDER BY clause. I'm then iterating through the results to build an associative array, with the row_id as the key. Then, I'm calling json_encode on that array and outputting the result. This page is loaded with AJAX, and defined in a Javascript variable. When I iterate through that Javascript variable, will I still have the order that was returned from the mysql_query?

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• Does OpenGL (ES) draw objects completely outside of the viewport?

  - by hyn

  I have a viewport setup with orthographic projection. If I ask OpenGL to draw a quad outside of the viewport (x y bounds) using glDrawArrays(), does it ignore, or still draws it?

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• How to draw text in a bitmap using wxpython?

  - by aF

  Hello, I want to draw a number centered inside a wx.EmptyBitmap. How can I do it using wxpython? Thanks in advance :)

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• Why is my List.Sort method in C# reversing the order of my list?

  - by Fiona Holder

  I have a list of items in a generic list: A1 (sort index 1) A2 (sort index 2) B1 (sort index 3) B2 (sort index 3) B3 (sort index 3) The comparator on them takes the form: this.sortIndex.CompareTo(other.sortIndex) When I do a List.Sort() on the list of items, I get the following order out: A1 A2 B3 B2 B1 It has obviously worked in the sense that the sort indexes are in the right order, but I really don't want it to be re-ordering the 'B' items. Is there any tweak I can make to my comparator to fix this?

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• How do I get results from a Linq query in the order of IDs that I provide?

  - by Keltex

  I'm looking to get query results back from Linq in the order that I pass IDs to the query. So it would look something like this: var IDs = new int [] { 5, 20, 10 } var items = from mytable in db.MyTable where IDs.Contains(mytable.mytableID) orderby // not sure what to do here select mytable; I'm hoping to get items in the order of IDs (5, 20, 10). (Note this is similar to this question, but I would like to do it in Linq instead of SQL)

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• How to draw a rounded rectangle in Core Graphics / Quartz 2D?

  - by mystify

  I need to draw an outline for a rounded rectangle. I know I can make lines and arcs, but maybe there is also a function for rounded rects?

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• How to draw a line with an arrow head?

  - by Rose

  I need to draw a line with an arrow head. How can i do this using Core graphics. Any help!!!

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• How to draw a line of plusses along a path in WPF?

  - by Jon H

  I need to draw a line with plusses along an given path (arch) but can't seem to find anything pointing me in the right direction. Any help would me much appreciated. Best, Jon H

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• How do I draw lines and rectangles on the iPhone?

  - by Rajendra Bhole

  I would like to draw a line and rectangle in my iPhone application. How would I go about doing this? Are there any tutorials I should read?

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• Data structure for an ordered set with many defined subsets; retrieve subsets in same order

  - by Aaron

  I'm looking for an efficient way of storing an ordered list/set of items where: The order of items in the master set changes rapidly (subsets maintain the master set's order) Many subsets can be defined and retrieved The number of members in the master set grow rapidly Members are added to and removed from subsets frequently Must allow for somewhat efficient merging of any number of subsets Performance would ideally be biased toward retrieval of the first N items of any subset (or merged subset), and storage would be in-memory (and maybe eventually persistent on disk)

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• How can i draw on top of an control which has many controls in it? (Z-order top)

  - by ikky

  Hi! I have a large panel with lots of pictureBoxes inside it. Is it possible to draw on these pictureboxes by drawing on the panel? What i want is that the actual drawing is on top of the panel. Is this possible to do, if so, how? Thanks in advance

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• iPhone: no way to draw on screen outside drawRect?

  - by Seva Alekseyev

  Is there a way to draw on the iPhone screen (on a UIView in a UIWindow) outside of that view's drawRect() method? If so, how do I obtain the graphics context? The graphics guide mentions class NSGraphicsContext, but the relevant chapter seems like a blind copy/paste from Mac OS X docs, and there's no such class in iPhone SDK.

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• Can I reverse the order of a multicast delegate event?

  - by Neil Barnwell

  When you subscribe to an event in .NET, the subscription is added to a multicast delegate. When the event is fired, the delegates are called in the order they were subscribed. I'd like to override the subscription somehow, so that the subscriptions are actually fired in the reverse order. Can this be done, and how? I think something like this might be what I need?: public event MyReversedEvent { add { /* magic! */ } remove { /* magic! */ } }

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• sort an array such that one half of the array has even numbers in ascending order and the other half

  - by nd81

  Design an algorithm with min time and space here is my solution - assume a array of N elements with 32 bit integers use a bit array to set the appropriate bits the array is sorted now assign even numbers to the first half of the array in ascending order assign odd numbers to the second half of the array in descending order any better solution ?

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• Draw Road Line from current location to target place.

  - by Siva

  Hi I am new to iphone development. In my application, i want to draw a road map(driving/walking mode) from current location (wherever we are in) into target place which is given by user via textfield. All things should be done inside my application. Is there any idea? or any sample?

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• ORACLE:- 'SELECT ORDER BY ASC' but 'USA' always first.

  - by Robert

  I have to write a drop down query for countries. But USA should always be first. The rest of the countries are in alphabetical order I tried the following query SELECT countries_id ,countries_name FROM get_countries WHERE countries_id = 138 UNION SELECT countries_id ,countries_name FROM get_countries WHERE countries_id != 138 ORDER BY 2 ASC

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• Are there any examples for how to draw a line chart in Core Plot on the iPhone?

  - by Chris

  Is there some sample code or a tutorial out there about how to draw a line chart using the Core Plot framework? I can't find anything using Google.

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• Change stack order in mobile view at 1140 grid?

  - by iHaveacomputer

  I want to implement the 1140grid at my site. The layout is pretty simple: 100% header 25% sidebar 75% page 100% footer see also http://jsfiddle.net/KB5Nq/ the problem is that i would like to change the stack order when the site is in mobile view: 100% header 100% page 100% sidebar 100% footer however, by default it arranges the blocks in the same order as they appear in the source code: header, sidebar, page, footer. is there an easy css-only fix for that?

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• How to draw interactive frame over user's desktop using java applet?

  - by Extax2

  I need to capture portion of user screen usign java applet. It is easy to do using Robot class but I'd like user to select which portion of screen to capture in draggy-droppy way. So I need to draw rectangular frame over users desktop and response when user resizes it. How could I do it? Thnx.

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• MySQL Order By Problem, Why is 1000 being seen as Smaller than 2?

  - by Jack

  I have a strange problem, I am trying to order the output of a set of records by a field called displayOrder. Now even though record A has a displayOrder of 2 and record B has a displayOrder of 1000, record B still shows up before record A. Here's my select statement: SELECT * FROM items ORDER BY displayOrder ASC It works fine until I have a record greater than 9, then 10, 11, 12, etc are seen as smaller than 2, 3, 4 because they start with the number 1. Any way to fox this?

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• Is the order guaranteed for the return of keySet() of a LinkedHashMap object?

  - by kknight

  I know LinkedHashMap object has a predictable iteration order for elements in it. Then, does the return of keySet() call on a LinkedHashMap object has the same iteration order as the LinkedHashMap object? Thanks.

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• Does strokeRect: of NSBezierPath always draw a transparent rect? (Cocoa OSX)

  - by Michael Minerva

  I am trying to make a custom selection box for an image view I created and I am trying to use strokeRect: from NSBezierPath but it always seems to be transparent. Called the method set to set the color the blackColor and then also tried using olorWithDeviceRed:green:blue:alpha: but no matter what I have tried the rectangle created always seems to be transparent. Is there a better method to use to draw an empty rectangle?

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