2014/10/15 下午 10:12:32

iphone Programming Glossary: perimeter

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

cv Point approx for size_t i 0 i contours.size i approximate contour with accuracy proportional to the contour perimeter approxPolyDP Mat contours i approx arcLength Mat contours i true 0.02 true Note absolute value of an area is used because..

How to limit a UIImageView to move in a specific path?

http://stackoverflow.com/questions/1571182/how-to-limit-a-uiimageview-to-move-in-a-specific-path

limit a UIImageView to move in a specific path The path is a circle and I want the UIImageView to follow exactly the perimeter of the circle. How can I achieve it objective c iphone share improve this question This is how I learned Watching Apple..

Curve text on existing circle

http://stackoverflow.com/questions/3841642/curve-text-on-existing-circle

NSString text atAngle float angle withRadius float radius CGSize textSize text sizeWithFont self.menuItemsFont float perimeter 2 M_PI radius float textAngle textSize.width perimeter 2 M_PI angle textAngle 2 for int index 0 index text length index.. CGSize textSize text sizeWithFont self.menuItemsFont float perimeter 2 M_PI radius float textAngle textSize.width perimeter 2 M_PI angle textAngle 2 for int index 0 index text length index NSRange range index 1 NSString letter text substringWithRange.. charSize.width charSize.height float x radius cos angle float y radius sin angle float letterAngle charSize.width perimeter 2 M_PI CGContextSaveGState context CGContextTranslateCTM context x y CGContextRotateCTM context angle 0.5 M_PI CGContextShowTextAtPoint..