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2014/10/15 ¤U¤È 10:12:27
iphone Programming Glossary: p1.xadjust corners and crop the image openCV http://stackoverflow.com/questions/13098073/adjust-corners-and-crop-the-image-opencv square 2 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.. 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 Mat image std vector.. 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 Mat image std vector cv Point square declare..
Objective-C check if subviews of rotated UIViews intersect? http://stackoverflow.com/questions/15710853/objective-c-check-if-subviews-of-rotated-uiviews-intersect 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 poly1.. 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 self projectionOfPolygon..
How to find the distance between two CG points? http://stackoverflow.com/questions/1906511/how-to-find-the-distance-between-two-cg-points idea how to do this 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..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew a trapezoid. p1 p2 p1 p2 p3 p4 p3 p4' Another to the vertical direction. A naive transformation rule is y c x' x p1.x ”——————†p1.x p1.y c y' y where c is the y coordinate of the intersection point of the lines joining p1 and p3 and.. p2 p1 p2 p3 p4 p3 p4' Another to the vertical direction. A naive transformation rule is y c x' x p1.x ”——————†p1.x p1.y c y' y where c is the y coordinate of the intersection point of the lines joining p1 and p3 and p2 and p4. Now notice..
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 stroke UIColor brownColor setStroke for CGFloat 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..
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 bezier for CGFloat t 0.0 t 1.00001 t 0.05 UIColor 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.. pointPath stroke now find the tangent 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..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed i float t float i 1.0f float granularity float tt t t float ttt tt t CGPoint pi intermediate 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.. 1.0f float granularity float tt t t float ttt tt t CGPoint pi intermediate 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.. float tt t t float ttt tt t CGPoint pi intermediate 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..
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