2014-11-15 87 views

回答

2
topx = X - radius 
topy = Y - radius 
bottomx = X + radius 
bottomy = Y + radius 
1

至於你提到的X和Y圓心cordinates則: -

topx = X - radius 
topy = Y - radius 
bottomx = X + radius 
bottomy = Y + radius