检查另一个圈子中是否包含一个圈子 [英] Check if a circle is contained in another circle

问题描述

我正在尝试检查另一个圈子中是否包含一个圈子.我不确定它背后的数学是问题还是我的if语句，因为我通过的任何内容都会不断得到True.

I'm trying to check if a circle is contained within another circle. I'm not sure if the math behind it is the problem or if its my if statement because I keep getting True for anything I pass.

#Get_center returns (x,y)
#Get_radius returns radius length
def contains(self,circle):
    distance = round(math.sqrt((circle.get_center()[0]-self.get_center()[0])**2 + (circle.get_center()[1] - self.get_center()[1])**2))
    distance_2 = distance + circle.get_radius()
    if distance_2 > distance:
        return True        #Circle 2 is contained within circle 1

推荐答案

我不了解python，但是数学很简单.见下图

I don't know about python but the math is simple. See the below picture

要检查第2圈是否在第1圈之内，

To check if circle 2 inside circle 1,

compute d 
    d = sqrt( (x2-x1)^2 + (y2-y1)^2 );
get c2 and c1
if c1 > ( d + c2 ) 
   circle 2 inside circle 1
else
   circle 2 not inside circle 1

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