2014/10/15 下午 10:10:07

iphone Programming Glossary: hypotf

Drag UIView around Shape Comprised of CGMutablePaths

http://stackoverflow.com/questions/13664615/drag-uiview-around-shape-comprised-of-cgmutablepaths

CGPoint p lastPointOfPathElement element if p return If the endpoint is too close to the prior point we discard it if hypotf p x priorPoint.x p y priorPoint.y kMinimumDistance return Otherwise we append it to the data and save it as the predecessor.. close to the very last point. If so we'll just discard the last point by decrementing the count if pathPointsCount_ 1 hypotf pathPoints_ 0 .x priorPoint.x pathPoints_ 0 .y priorPoint.y kMinimumDistance pathPointsCount_ 1 Blammo. Point array created... the distance from the handle to a point should the handle be moved along the path by some offset. Your old buddy hypotf computes the Euclidean distance so you don't have to CGFloat distanceToPoint CGPoint point ifHandleMovesByOffset NSInteger..

Objective C: Using UIImage for Stroking

http://stackoverflow.com/questions/8290680/objective-c-using-uiimage-for-stroking

point. CGPoint vector CGPointMake currentPosition.x lastPosition.x currentPosition.y lastPosition.y CGFloat distance hypotf vector.x vector.y vector.x distance vector.y distance for CGFloat i 0 i distance i 1.0f CGPoint p CGPointMake lastPosition.x..