如何在 Corona SDK 中检查一个圆是否在另一个圆里面

尝试

local abs = math.abs
local function distanceBetweenTwoPoints(x1, y1, x2, y2)
  return (((x2 - x1) ^ 2) + ((y2 - y1) ^ 2)) ^ 0.5
end

-- (x1, y1) 为第一个圆心，r1 为半径
-- (x2, y2) 为第二个圆心，r2 为半径
local function circleOverlap(x1, y1, r1, x2, y2, r2)
  return (distanceBetweenTwoPoints(x1, y1, x2, y2) <= r2 + r1)
end

local function oneCircleInsideOther(x1, y1, r1, x2, y2, r2)
  return (distanceBetweenTwoPoints(x1, y1, x2, y2) <= abs(r2 - r1))
end

一些测试

print(circleOverlap(0, 0, 1, 0, 0, 2)) -- true
print(circleOverlap(0, 1, 1, 0, 3, 1)) -- false
print(circleOverlap(1, 1, 1, 3, 3, 1)) -- false
print(circleOverlap(5, 10, 5, 12, 10, 2)) -- true

print(oneCircleInsideOther(0, 0, 1, 0, 0, 2)) -- true
print(oneCircleInsideOther(0, 1, 1, 0, 3, 1)) -- false
print(oneCircleInsideOther(1, 1, 1, 3, 3, 1)) -- false
print(oneCircleInsideOther(5, 10, 5, 12, 10, 2)) -- false

借鉴前面的答案：

-- (x1, y1) 是第一个圆的中心点坐标和半径 r1
-- (x2, y2) 是第二个圆的中心点坐标和半径 r2
-- 如果圆 2 在圆 1 内部，则返回 true
local function circleInside(x1, y1, r1, x2, y2, r2)
  return (distanceBetweenTwoPoints(x1, y1, x2, y2)+ r2 < r1)
end