fixed drawKeypoints (keypoint orientation)

8a613758 · Maria Dimashova · 9c2efd6c · 8a613758
Commit 8a613758 authored May 30, 2011 by Maria Dimashova
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Showing with 3 additions and 2 deletions

draw.cpp modules/features2d/src/draw.cpp +3 -2

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--- a/modules/features2d/src/draw.cpp
+++ b/modules/features2d/src/draw.cpp
@@ -67,8 +67,9 @@ static inline void _drawKeypoint( Mat& img, const KeyPoint& p, const Scalar& col
        if( p.angle != -1 )
        {
            float srcAngleRad = p.angle*(float)CV_PI/180.f;
-            Point orient(cvRound(cos(srcAngleRad)*radius), 
-						 cvRound(sin(srcAngleRad)*radius));
+            Point orient( cvRound( cos(srcAngleRad)*radius ),
+                          cvRound(-sin(srcAngleRad)*radius ) // "-" to invert orientation of axis y
+                        );
            line( img, center, center+orient, color, 1, CV_AA, draw_shift_bits );
        }
 #if 0