问题
I have drawn a rectangle. I know its (x1,y1) Top Left and (x2,y2) Bottom Right coordinates.. I also have the height h and width w of drawn rectangle.. How can I find the center coordinates (x,y) ?
I am currently using the following formula.
(x,y) = (x2 + x1)/2, (y2+y1)/2
It gives the correct y coordinate but no luck in x.
回答1:
The center of rectangle is the mid point of the diagonal end points of rectangle.
Here the midpoint is ( (x1 +x2)/2 ,(y1 + y2)/2 ).
that means xCenter = (x1 +x2)/2
yCenter = (y1 + y2)/2
Let me know your code.
回答2:
Center x = x + 1/2 of width
Center y = y + 1/2 of height
If you know the width and height already then you only need one set of coordinates.
回答3:
We can calculate using mid point of line formula,
centre (x,y) = new Point((boundRect.tl().x+boundRect.br().x)/2,(boundRect.tl().y+boundRect.br().y)/2)
来源：https://stackoverflow.com/questions/9734821/how-to-find-the-center-coordinate-of-rectangle