2014/10/15 下午 10:08:44

iphone Programming Glossary: fabs

UIImagePickerController and extracting EXIF data from existing photos

http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos

return taggedJpegData autorelease Helper methods for location conversion NSMutableArray createLocArray double val val fabs val NSMutableArray array NSMutableArray alloc init double deg int val array addObject NSNumber numberWithDouble deg val..

How to detect iPhone 5 (widescreen devices)?

http://stackoverflow.com/questions/12446990/how-to-detect-iphone-5-widescreen-devices

The iPhone 5's screen has a height of 568. You can imagine a macro to simplify all of this #define IS_IPHONE_5 fabs double UIScreen mainScreen bounds .size.height double 568 DBL_EPSILON The use of fabs with the epsilon is here to prevent.. all of this #define IS_IPHONE_5 fabs double UIScreen mainScreen bounds .size.height double 568 DBL_EPSILON The use of fabs with the epsilon is here to prevent precision errors when comparing floating points as pointed in the comments by H2CO3... such a screen so we may use another set of macros. Let's rename the original macro IS_WIDESCREEN #define IS_WIDESCREEN fabs double UIScreen mainScreen bounds .size.height double 568 DBL_EPSILON And let's add model detection macros #define IS_IPHONE..

Boundry detect paper sheet opencv

http://stackoverflow.com/questions/13493035/boundry-detect-paper-sheet-opencv

area is used because area may be positive or negative in accordance with the contour orientation if approx.size 4 fabs contourArea Mat approx 1000 isContourConvex Mat approx double maxCosine 0 for int j 2 j 5 j double cosine fabs angle.. fabs contourArea Mat approx 1000 isContourConvex Mat approx double maxCosine 0 for int j 2 j 5 j double cosine fabs angle approx j 4 approx j 2 approx j 1 maxCosine MAX maxCosine cosine if maxCosine 0.3 squares.push_back approx NSLog..

Slicing up a UIImage on iPhone

http://stackoverflow.com/questions/248667/slicing-up-a-uiimage-on-iphone

tileImgArray int r c originalImage image CGImage imgWidth image.size.width imgHeight image.size.height diff fabs imgWidth imgHeight if imgWidth imgHeight resizedImage CGImageCreateWithImageInRect originalImage CGRectMake floor diff 2..

UITableView: scrolling programmatically the content view

http://stackoverflow.com/questions/3457900/uitableview-scrolling-programmatically-the-content-view

rc.size.width CGRect newRect CGRectMake rc.origin.x rc.origin.y self.contentSize.height self.contentSize.width fabs tPoint.y previousYPan NSLog @ BOND RECT f f f f rc.origin.x rc.origin.y rc.size.height rc.size.width NSLog @ NEW RECT f..

Rotating image using objective C

http://stackoverflow.com/questions/4010779/rotating-image-using-objective-c

Zoom to fit region for all annotations - ending up zooming in between annotations

http://stackoverflow.com/questions/4523604/zoom-to-fit-region-for-all-annotations-ending-up-zooming-in-between-annotation

topLeftCoord.longitude bottomRightCoord.longitude topLeftCoord.longitude 0.5 region.span.latitudeDelta fabs topLeftCoord.latitude bottomRightCoord.latitude 1.1 Add a little extra space on the sides region.span.longitudeDelta fabs.. topLeftCoord.latitude bottomRightCoord.latitude 1.1 Add a little extra space on the sides region.span.longitudeDelta fabs bottomRightCoord.longitude topLeftCoord.longitude 1.1 Add a little extra space on the sides region mapView regionThatFits..

Simple iPhone motion detect

http://stackoverflow.com/questions/5214197/simple-iphone-motion-detect

is appropriate play around with different values CMAcceleration userAcceleration deviceMotion.userAcceleration if fabs userAcceleration.x accelerationThreshold fabs userAcceleration.y accelerationThreshold fabs userAcceleration.z accelerationThreshold.. values CMAcceleration userAcceleration deviceMotion.userAcceleration if fabs userAcceleration.x accelerationThreshold fabs userAcceleration.y accelerationThreshold fabs userAcceleration.z accelerationThreshold enter code here Basically that's.. if fabs userAcceleration.x accelerationThreshold fabs userAcceleration.y accelerationThreshold fabs userAcceleration.z accelerationThreshold enter code here Basically that's it. Bear in mind that every acceleration will..

how to display UIActivityIndicatorView BEFORE rotation begins

http://stackoverflow.com/questions/7041261/how-to-display-uiactivityindicatorview-before-rotation-begins

simulateHardWorkNeededToGetDisplayInShapeBeforeRotation NSLog @ Starting simulated work NSDate date NSDate date while fabs date timeIntervalSinceNow 2.0 NSLog @ Finished simulated work void showActivityIndicatorView NSLog @ showActivity if self..

Fade in/out UIScrollView's content like Mobile Safari does in its tab

http://stackoverflow.com/questions/875129/fade-in-out-uiscrollviews-content-like-mobile-safari-does-in-its-tab

offset change objectForKey NSKeyValueChangeNewKey CGPointValue .x CGFloat origin self frame .origin.x CGFloat delta fabs origin offset UIView beginAnimations @ Fading context nil if delta self frame .size.width self.alpha 1 delta self.frame.size.width..

How to write exif metadata to an image (not the camera roll, just a UIImage or JPEG)

http://stackoverflow.com/questions/9006759/how-to-write-exif-metadata-to-an-image-not-the-camera-roll-just-a-uiimage-or-j

ss.SS Create GPS Dictionary NSDictionary gpsDict NSDictionary dictionaryWithObjectsAndKeys NSNumber numberWithFloat fabs loc.coordinate.latitude kCGImagePropertyGPSLatitude loc.coordinate.latitude 0 @ N @ S kCGImagePropertyGPSLatitudeRef .. loc.coordinate.latitude 0 @ N @ S kCGImagePropertyGPSLatitudeRef NSNumber numberWithFloat fabs loc.coordinate.longitude kCGImagePropertyGPSLongitude loc.coordinate.longitude 0 @ E @ W kCGImagePropertyGPSLongitudeRef.. formatter stringFromDate loc timestamp kCGImagePropertyGPSTimeStamp NSNumber numberWithFloat fabs loc.altitude kCGImagePropertyGPSAltitude nil The gps info goes into the gps metadata part CFDictionarySetValue mutable..

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

H X x3a y21 x4a y21 x1a y43 x2a y43 W x3a y2a x4a y2a x2a y3a x4a y3a x2a y4a x3a y4a const double kEpsilon 0.0001 if fabs i kEpsilon i kEpsilon i 0 1.0 1.0 CATransform3D transform a i d i 0 g i b i e i 0 h i 0 0 1 0 c i f i 0 1.0 return transform..