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2014/10/15 ¤U¤È 10:11:19
iphone Programming Glossary: mathresize uitableviewcell to the label's height dynamically? http://stackoverflow.com/questions/1012361/resize-uitableviewcell-to-the-labels-height-dynamically is there any way i can resize the cell's height according to the text entered in uitextview objective c iphone xcode math share improve this question There is a UITableView delegate method called heightForRowAtIndexPath that is called before..
http://stackoverflow.com/questions/1501949/nsstring-to-equation what you're asking and even allows you to do variable substitutions 3x 42 evaluate with x 7 . It even has support for mathematical functions like sin cos tan their inverses dtor log .... edit a long time later... While GCMathParser is pretty awesome..
How can I skip compressing one PNG? http://stackoverflow.com/questions/2051947/how-can-i-skip-compressing-one-png do this Read the link above for details on why but the gist of it is that the optimization lets the iPhone skip some math that slows down PNG display. Xcode will only optimize PNG image files that it knows about. To prevent a specific PNG from..
How to make an progress bar for an NSURLConnection when downloading a file? http://stackoverflow.com/questions/2267950/how-to-make-an-progress-bar-for-an-nsurlconnection-when-downloading-a-file how much data I have already and how much data has to be downloaded Probably in bytes... And then I have to do some math to get the percentage iphone progress bar nsurlconnection share improve this question In your NSURLConnection delegate..
Detecting Acceleration in a car (iPhone Accelerometer) http://stackoverflow.com/questions/2733249/detecting-acceleration-in-a-car-iphone-accelerometer that didn't make sense and we were once again going out of sync. Talking with someone a lot smarter than me at math lead to a solution that I have been trying to implement for longer than I would like to admit. It's steps are as follows.. this as the forward momentum. Ignore for now the user cases where this will be difficult and let's concentrate on the math 3 From the forward vector and the gravity vector construct a plane. 4 Whenever a force is received project it onto said.. some strong inaccuracies. The end result is that the app is even more inaccurate now than before. So basically all you math and iPhone brains out there any glaring errors Any potentially better solutions Any experience that could be useful at all..
Using the apple FFT and accelerate Framework http://stackoverflow.com/questions/3398753/using-the-apple-fft-and-accelerate-framework different routines return values that need to be scaled by different amounts in order to be correct as per the math In this case... scale float 1.0 2 n vDSP_vsmul A.realp 1 scale A.realp 1 nOver2 vDSP_vsmul A.imagp 1 scale A.imagp 1 nOver2..
How do I apply a perspective transform to a UIView? http://stackoverflow.com/questions/347721/how-do-i-apply-a-perspective-transform-to-a-uiview perspective working as described here is to directly access one of the matrix cells of the CATransform3D m34 . Matrix math has never been my thing so I can't explain exactly why this works but it does. You'll need to set this value to a negative..
http://stackoverflow.com/questions/3841642/curve-text-on-existing-circle imageWithCGImage contextImage withName @ test.png return UIImage imageWithCGImage contextImage iphone cocoa touch math quartz graphics quartz 2d share improve this question I tried to work it out quickly on paper so i may be wrong Convert..
iPhone smooth sketch drawing algorithm http://stackoverflow.com/questions/5076622/iphone-smooth-sketch-drawing-algorithm The easiest way to smooth a curve like this is to use a Bezier curve instead of straight line segments. For the math behind this see this article pointed to in this answer which describes how to calculate the curves required to smooth a..
Convert decimal to fraction in Objective-C? http://stackoverflow.com/questions/5552537/convert-decimal-to-fraction-in-objective-c 7 1 2 instead of 7.5000. Thank you in advanced Update 5 13 2011 Well I got it to display 7 1 16 but something with the math is off. Because it won't change from 1 16 even by changing the values that are getting divided. Where am I going wrong here.. objective c xcode formatting share improve this question Objective C uses pure C for basically all primitive mathematical operations. This being said you'll find all necessary information along with C code in the answers of this other..
problem with collision of two images http://stackoverflow.com/questions/5926355/problem-with-collision-of-two-images To complicate things more if your objects are round CGRectIntersectsRect won't exactly work. That complicates the math a bit but it's not too bad. With my app I found it quite difficult to get the physics to look realistic. THe problem became..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare anyone could help me out with the first steps with comparing to arrays I would be a happy man Thanks iphone android math artificial intelligence gesture recognition share improve this question Try dynamic time warping . Here is an illustrative..
http://stackoverflow.com/questions/8482327/learning-opengles-2-0-on-ios covers both OpenGL ES 1.1 and 2.0. It does not assume that you know OpenGL ES and he does explain a good bit of the math and other fundamentals required to understand what he's talking about. He gets into some pretty advanced techniques towards..
Getting the visible rect of an UIScrollView's content http://stackoverflow.com/questions/868288/getting-the-visible-rect-of-an-uiscrollviews-content scrollView.bounds.size rather than scrollView.contentSize which is the size of the content view. Also simplified the math a bit and didn't quite see the use for the isless which would break the code whenever it's greater. share improve this..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed NSMutableArray self pointsOrdered mutableCopy if points.count 4 return self bezierPath Add control points to make the math make sense points insertObject points objectAtIndex 0 atIndex 0 points addObject points lastObject UIBezierPath smoothedPath.. points pointsFromBezierPath self mutableCopy if points.count 4 return self copy Add control points to make the math make sense points insertObject points objectAtIndex 0 atIndex 0 points addObject points lastObject UIBezierPath smoothedPath..
To ARC or not to ARC? What are the pros and cons? http://stackoverflow.com/questions/8760431/to-arc-or-not-to-arc-what-are-the-pros-and-cons more thinking about to do correctly. Fancy handling of ObjC varargs can also cause trouble. Most things involving math on an ObjC pointer is trickier. You shouldn't have much of this in any case. You cannot put an id in a struct . This is..
Transforming a rectangle image into a quadrilateral using a CATransform3D http://stackoverflow.com/questions/9470493/transforming-a-rectangle-image-into-a-quadrilateral-using-a-catransform3d 515.09 211.5 263.555 327.066 500.734 295 229.031 161.277 427.125 192.562 229.16 226 416.48 256 iphone ios cocoa touch math core animation share improve this question I've created a kit for doing this on iOS https github.com hfossli AGGeometryKit..
How can you apply distortions to a UIImage using OpenGL ES? http://stackoverflow.com/questions/9886843/how-can-you-apply-distortions-to-a-uiimage-using-opengl-es using the GPUImagePinchDistortionFilter If you look at the shaders used for each of the filters you'll find that the math is very similar between them. You should be able to tweak that to produce your own custom effects from this same base. It's..
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