Rotation of RotatedRect in OpenCv

Question

I am using OpenCV in Java. I have two concerns, one of them is crucial for me:

I have RotatedRect and I want to Rotate this RotatedRect and get new RotatedRect or just Rect (in case of rotating strict vertical or horizontal). let it say:

RotatedRect rr = ...; //existing RotatedRect 
RotatedRect result = rotateRotatedRect(rr, angle);

I need smth for rotateRotatedRect() method.

My second question is, I want to scale RotatedRect (scaling from the center or from one of the corner is fine)

Can you suggest me anything. I can implement this, but requires time and logiic. Thank you.

Community · Accepted Answer · 2020-06-20 09:12:55Z

1

As you can see in the documentation:

Class RotatedRect

double angle (the rotation angle in a clockwise direction)

Point center (the rectangle mass center)

Size size (width and height of the rectangle)

To achieve rotation and scaling, you can directly change the RotatedRect variables.

RotatedRect rr = ...; // existing RotatedRect 
rr.angle += 30;       // rotates 30 degrees clockwise
rr.size.width *= 2;   // scales width by 2
rr.size.height *= 2;  // scales height by 2

edited Jun 20, 2020 at 9:12

CommunityBot

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answered May 27, 2016 at 1:59

Berriel

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2 Comments

RustamIS Over a year ago

Thank you. I've just looked for source code, and you are right! I haven't thought it might be like this. I was expecting calculation on native level.

Berriel Over a year ago

@RustamIS :) You can move (translate) the RotatedRect by moving the center too.

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