Bounding box of al list of circles

Question

I have a list of circles with a location and radius for each circle eg, [(x, y, r), ...] .

I need to find a bounding box for the entire list so that all circles are contained in the box. I tried going over all circles and finding the minimum and maximum x and y values but this does not take into account the radius of each circle.

xlist = []
ylist = []
for circle in circle_list:
    xlist.append(circle[0])
    ylist.append(circle[1])

# top-left and bottom-right corners
bbox = [(min(xlist), min(ylist)), (max(xlist), max(ylist))]

Answer 1

You should take radius into account while creating xlist and ylist . It is like:

xlist = []
ylist = []
for circle in circle_list:
    x,y,r = circle[0], circle[1], circle[2]
    xlist.append(x-r)
    xlist.append(x+r)
    ylist.append(y-r)
    ylist.append(y+r)