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rotRect using points

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This commit is contained in:
Rohit Girdhar 2014-02-14 09:37:39 +05:30
parent f297ec55ae
commit 613a17355d
1 changed files with 26 additions and 0 deletions
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26
modules/core/include/opencv2/core/types.hpp
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@ -392,6 +392,7 @@ public:
//! various constructors
RotatedRect();
RotatedRect(const Point2f& center, const Size2f& size, float angle);
RotatedRect(const std::vector<Point2f>& points);
//! returns 4 vertices of the rectangle
void points(Point2f pts[]) const;
@ -1547,6 +1548,31 @@ inline
RotatedRect::RotatedRect(const Point2f& _center, const Size2f& _size, float _angle)
: center(_center), size(_size), angle(_angle) {}
inline
RotatedRect::RotatedRect(const std::vector<Point2f>& _points)
{
CV_Assert( _points.size() == 3 );
Point2f _center = 0.5f * (_points[0] + _points[2]);
Vec2f vecs[2];
vecs[0] = Vec2f(_points[0] - _points[1]);
vecs[1] = Vec2f(_points[1] - _points[2]);
// check that given sides are perpendicular
CV_Assert( abs(vecs[0].dot(vecs[1])) <= 0.001 );
// wd_i stores which vector (0,1) or (1,2) will make the width
// One of them will definitely have slope within -1 to 1
int wd_i = 0;
if( vecs[1][0] != 0 && fabs(vecs[1][1] / vecs[1][0]) <= 1.0f ) wd_i = 1;
int ht_i = (wd_i + 1) % 2;
float _angle = atan(vecs[wd_i][1] / vecs[wd_i][0]) * 180.0f / (float) CV_PI;
float _width = norm(vecs[wd_i]);
float _height = norm(vecs[ht_i]);
center = _center;
size = Size2f(_width, _height);
angle = _angle;
}
///////////////////////////////// Range /////////////////////////////////