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2014/10/15 ¤U¤È 10:12:27
iphone Programming Glossary: p2.yadjust corners and crop the image openCV http://stackoverflow.com/questions/13098073/adjust-corners-and-crop-the-image-opencv break break return sorted_square Helper float distanceBetweenPoints cv Point 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.. Helper float distanceBetweenPoints cv Point 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.. 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 int..
Objective-C check if subviews of rotated UIViews intersect? http://stackoverflow.com/questions/15710853/objective-c-check-if-subviews-of-rotated-uiviews-intersect i Perpendicular vector for one edge of poly1 CGPoint p1 poly1 i CGPoint p2 poly1 i 1 count1 CGPoint perp CGPointMake p2.y p1.y p2.x p1.x Projection intervals of poly1 poly2 onto perpendicular vector CGFloat minp1 maxp1 minp2 maxp2 self projectionOfPolygon.. with edges from poly2 for int i 0 i count2 i CGPoint p1 poly2 i CGPoint p2 poly2 i 1 count2 CGPoint perp CGPointMake p2.y p1.y p2.x p1.x CGFloat minp1 maxp1 minp2 maxp2 self projectionOfPolygon poly1 count count1 onto perp min minp1 max maxp1..
How to find the distance between two CG points? http://stackoverflow.com/questions/1906511/how-to-find-the-distance-between-two-cg-points iphone cocoa touch share improve this question Distance between p1 and p2 CGFloat xDist p2.x p1.x CGFloat yDist p2.y p1.y CGFloat distance sqrt xDist xDist yDist yDist Background Pythagorean theorem Edit if you only need to calculate if..
Find a point, a given distance, along a simple cubic bezier curve. (On an iPhone!) http://stackoverflow.com/questions/4058979/find-a-point-a-given-distance-along-a-simple-cubic-bezier-curve-on-an-iphone t 0.0 t 1.00001 t 0.05 CGPoint point CGPointMake bezierInterpolation t p1.x p2.x p3.x p4.x bezierInterpolation t p1.y p2.y p3.y p4.y UIBezierPath pointPath UIBezierPath bezierPathWithArcCenter point radius 5 startAngle 0 endAngle 2 M_PI clockwise..
Find the tangent of a point on a cubic bezier curve (on an iPhone) http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone brownColor setStroke CGPoint point CGPointMake bezierInterpolation t p1.x p2.x p3.x p4.x bezierInterpolation t p1.y p2.y p3.y p4.y there use either bezierInterpolation or altBezierInterpolation identical results for the position just draw.. if someone on stackoverflow knows how CGPoint vel CGPointMake bezierTangent t p1.x p2.x p3.x p4.x bezierTangent t p1.y p2.y p3.y p4.y the following code simply draws an indication of the tangent CGPoint demo CGPointMake point.x vel.x 0.3 point.y..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed point pi.x 0.5 2 p1.x p2.x p0.x t 2 p0.x 5 p1.x 4 p2.x p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt pi.y 0.5 2 p1.y p2.y p0.y t 2 p0.y 5 p1.y 4 p2.y p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath addLineToPoint pi Now add p2 smoothedPath.. p1.x p2.x p0.x t 2 p0.x 5 p1.x 4 p2.x p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt pi.y 0.5 2 p1.y p2.y p0.y t 2 p0.y 5 p1.y 4 p2.y p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath addLineToPoint pi Now add p2 smoothedPath addLineToPoint p2 finish by.. p1.x 4 p2.x p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt pi.y 0.5 2 p1.y p2.y p0.y t 2 p0.y 5 p1.y 4 p2.y p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath addLineToPoint pi Now add p2 smoothedPath addLineToPoint p2 finish by adding the last point smoothedPath..
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