2014/10/15 下午 10:07:47

iphone Programming Glossary: dy

adjust corners and crop the image openCV

http://stackoverflow.com/questions/13098073/adjust-corners-and-crop-the-image-opencv

corners and crop the image openCV I am using open CV in IOS. I already detected the boundary of the paper sheet in an Image as show in image and Now I have to drag these boundary line on touch.. p1 cv Point p2 if p1.x p2.x return abs p2.y p1.y else if p1.y p2.y return abs p2.x p1.x else float dx p2.x p1.x float dy p2.y p1.y return sqrt dx dx dy dy cv Mat getPaperAreaFromImage cv Mat image std vector cv Point square declare used vars.. abs p2.y p1.y else if p1.y p2.y return abs p2.x p1.x else float dx p2.x p1.x float dy p2.y p1.y return sqrt dx dx dy dy cv Mat getPaperAreaFromImage cv Mat image std vector cv Point square declare used vars int paperWidth 210 in mm because..

Ask for an example code for parsing xml and get attributes by using GData API

http://stackoverflow.com/questions/3028020/ask-for-an-example-code-for-parsing-xml-and-get-attributes-by-using-gdata-api

value Wanted a piece of example code.Thanks a lot. xml playurls url islive 0 type 3 bit_stream 1 http vods.netitv.com dy2 2010 02 08 cf584b76 3579 4b75 a0c8 f7a473d79f8c.mp4 url url islive 0 type 3 bit_stream 2 http vods.netitv.com dy 2010 02.. dy2 2010 02 08 cf584b76 3579 4b75 a0c8 f7a473d79f8c.mp4 url url islive 0 type 3 bit_stream 2 http vods.netitv.com dy 2010 02 08 965bbc65 8ec0 4c50 98ae c69a831926cc.mp4 url url islive 0 type 2 bit_stream 1 http vods.netitv.com dy2 2010 02.. dy 2010 02 08 965bbc65 8ec0 4c50 98ae c69a831926cc.mp4 url url islive 0 type 2 bit_stream 1 http vods.netitv.com dy2 2010 02 08 cf584b76 3579 4b75 a0c8 f7a473d79f8c.mp4 url url islive 0 type 2 bit_stream 2 http vods.netitv.com dy 2010 02..

UISwipeGestureRecognizer Swipe length

http://stackoverflow.com/questions/4828833/uiswipegesturerecognizer-swipe-length

CGPoint stopLocation sender locationInView self.view CGFloat dx stopLocation.x startLocation.x CGFloat dy stopLocation.y startLocation.y CGFloat distance sqrt dx dx dy dy NSLog @ Distance f distance share improve this answer..

Point to location using compass

http://stackoverflow.com/questions/5092845/point-to-location-using-compass

float y1 coordinate.longitude float x2 annLatitude floatValue float y2 annLongitude floatValue float dx x2 x1 float dy y2 y1 if dx 0 if dy 0 result 90 else result 270 else result atan dy dx 180 M_PI if dx 0 result result 180 if result 0.. float x2 annLatitude floatValue float y2 annLongitude floatValue float dx x2 x1 float dy y2 y1 if dx 0 if dy 0 result 90 else result 270 else result atan dy dx 180 M_PI if dx 0 result result 180 if result 0 result result 360 The.. y2 annLongitude floatValue float dx x2 x1 float dy y2 y1 if dx 0 if dy 0 result 90 else result 270 else result atan dy dx 180 M_PI if dx 0 result result 180 if result 0 result result 360 The true and the magnetic heading is retrieved like..

How to draw a color wheel in objective-c

http://stackoverflow.com/questions/5108921/how-to-draw-a-color-wheel-in-objective-c

getColorWheelValue int widthHeight int x int y float outH float outS int c widthHeight 2 float dx float x c c float dy float y c c float d sqrtf float dx dx dy dy outS d outH acosf float dx d M_PI 2.0f if dy 0 outH 1.0 outH UIImage createUIImageWithRGBAData.. x int y float outH float outS int c widthHeight 2 float dx float x c c float dy float y c c float d sqrtf float dx dx dy dy outS d outH acosf float dx d M_PI 2.0f if dy 0 outH 1.0 outH UIImage createUIImageWithRGBAData CFDataRef data int width.. int y float outH float outS int c widthHeight 2 float dx float x c c float dy float y c c float d sqrtf float dx dx dy dy outS d outH acosf float dx d M_PI 2.0f if dy 0 outH 1.0 outH UIImage createUIImageWithRGBAData CFDataRef data int width..

Custom transition between two UIViews

http://stackoverflow.com/questions/5511514/custom-transition-between-two-uiviews

image.size.height 2.0 float dX center.x self.view.center.x float dY center.y self.view.center.y NSLog @ dx f dy f dX dY transform CGAffineTransformTranslate transform dX dY Scale our view float scaleWFactor image.size.width self.view.frame.size.width..

Need to find Distance using Gyro+Accelerometer

http://stackoverflow.com/questions/6647314/need-to-find-distance-using-gyroaccelerometer

dx 0.0f float vx 0.0f for int i 1 i n i vx acceleration_x i 1 acceleration_x i 2.0f dt dx vx dt and similarly for dy and dz. Here float acceleration_x n contains x acceleration values from start to end of measurement at times 0 dt 2 dt 3.. to end of measurement at times 0 dt 2 dt 3 dt ... n 1 dt. To find the total displacement you just do dl sqrt dx dx dy dy dz dz Gyroscope is not necessary for this but if you are measuring linear distances you can use the gyroscope reading.. to end of measurement at times 0 dt 2 dt 3 dt ... n 1 dt. To find the total displacement you just do dl sqrt dx dx dy dy dz dz Gyroscope is not necessary for this but if you are measuring linear distances you can use the gyroscope reading to..

Drawing Smooth Curves - Methods Needed

http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed

index 1 CGPoint p1 POINT index CGPoint p2 POINT index 1 CGPoint p3 POINT index 2 now add n points starting at p1 dx dy up until p2 using Catmull Rom splines for int i 1 i granularity i float t float i 1.0f float granularity float tt t t float.. index 1 CGPoint p1 POINT index CGPoint p2 POINT index 1 CGPoint p3 POINT index 2 now add n points starting at p1 dx dy up until p2 using Catmull Rom splines for int i 1 i granularity i float t float i 1.0f float granularity float tt t t float..