Is there any simple way to multiply cv::Rect size and coordinates?

manpreet Best Answer 2 years ago

Let's say I have 2 rectangle. I want the second rectangle to be twice bigger than the first rectangle and the position of x,y also twice bigger.

cv::Rect r1=Rect(10,20,40,60);
cv::Rect r2 = r1 * 2;  //this won't work

Setting the rectangle 2 parameter 1 by 1 will work

r2.height = r1.height * 2;
r2.width = r1.height * 2;
r2.x = r1.x * 2;
r2.y = r2.y * 2;

It works">works, but is there any simpler way to do it (like single line code)?

manpreet 2 years ago

We can overload the * operator:

ref="https://forum.tuteehub.com/tag/cv">cv::Rect operator*(ref="https://forum.tuteehub.com/tag/cv">cv::Rect r, double ref="https://forum.tuteehub.com/tag/scale">scale) {
    r.height *= ref="https://forum.tuteehub.com/tag/scale">scale;
    r.width *= ref="https://forum.tuteehub.com/tag/scale">scale;
    r.x *= ref="https://forum.tuteehub.com/tag/scale">scale;
    r.y *= ref="https://forum.tuteehub.com/tag/scale">scale;
    return r;
}

And then you can multiply ref="https://forum.tuteehub.com/tag/rectangles">rectangles directly:

Rect r2 = Rect(10, 20, 40, ref="https://forum.tuteehub.com/tag/60">60) * 2;