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Does Direct2D support custom shaped windows? Say, drawing a circle over all other windows. If yes, could anyone give a link to an article or sample of such technique? Thanks.
Yep, it does.
Here is an article with examples, unfortunately, it goes in Russian, so use an online translator:
http://teran.karelia.pro/articles/item_5710.html
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How do I display Mathematics in the iphone app that I am making in swift?
For example, I can use MathJax to display mathematics in wordpress, thus is there a program that I can import mathematics to use in swift or how else can I do that?
So far, mine is very simplistic.
If all you're after is a higher baseline for the exponent and a lower baseline for the subscripts, use NSAttributedString and NSBaselineOffsetAttributeName.
Or if you really like MathJax, you could use MathJax (and UIWebViews instead of UILabels).
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Is there any way to detect hand or palm using CIDetector? I have googled but only face detection is found, is there any way to do it? please help.
In iOS 8 you can detect QR codes and rectangles too, but alas, not hands or palms.
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I want to implement the Glassed-Broken particle effective with spritekit, for example
http://www.ps123.net/design/UploadFiles_design/200902/20090225090558921.jpg
How to?
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I have a task of building 2d game (packman style) and I need to use open gl(any version) for drawing image (task says so). It means I should build "open gl application" in Xcode, or it is enough to use Core Graphics or UIViews?
I had a very positive experience in my experiments at writing a 2D "packman-style" game using Core Graphics: if you do it right, CALayer animation proves sufficiently reliable and simple to implement.
Here is a link to a great article that explains how you can implement animated sprites in Cocoa. The trick is to use image atlases to avoid managing multiple images at runtime.
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I am new to Quartz, and I would like to draw a candlestick chart in iOS, but I don't know how.
How can I draw charts like this? Are there any good examples for iOS?
Core Plot may be able to do it. If not, it's probably a pretty easy thing to add to the Core Plot library.
http://code.google.com/p/core-plot/
You can do it with SwiftCharts, there are 2 candle sticks examples ready to use - one interactive and other not-interactive (with less overhead, in case you don't need interactivity)
(Disclosure: I'm the author)