Circle Corct碰撞檢測在Corona SDK中不起作用

Question

我需要擺脫我遊戲中的物理因素，因此我需要實現自定義碰撞檢測功能（每幀調用碰撞檢測功能）。我想檢查矩形是否與圓相交。我從here代碼（答案由e.James）：

bool intersects(CircleType circle, RectType rect) 
{ 
    circleDistance.x = abs(circle.x - rect.x - rect.width/2); 
    circleDistance.y = abs(circle.y - rect.y - rect.height/2); 

    if (circleDistance.x > (rect.width/2 + circle.r)) { return false; } 
    if (circleDistance.y > (rect.height/2 + circle.r)) { return false; } 

    if (circleDistance.x <= (rect.width/2)) { return true; } 
    if (circleDistance.y <= (rect.height/2)) { return true; } 

    cornerDistance_sq = (circleDistance.x - rect.width/2)^2 + 
         (circleDistance.y - rect.height/2)^2; 

    return (cornerDistance_sq <= (circle.r^2)); 
} 

它改成這樣：

--Collision detection between circle and rect 
local function intersects(circle, rect) 
    if circle ~= nil then 
     local circleDistance_x = math.abs(circle.x - rect.x - rect.width/2); 
     local circleDistance_y = math.abs(circle.y - rect.y - rect.height/2); 

     if (circleDistance_x > (rect.width/2 + circle.r)) then 
      return false 
     end 
     if (circleDistance_y > (rect.height/2 + circle.r)) then 
      return false 
     end 

     if (circleDistance_x <= (rect.width/2)) then 
      return true 
     end 

     if (circleDistance_y <= (rect.height/2)) then 
      return true 
     end 

     cornerDistance_sq = (circleDistance_x - rect.width/2)^2 + 
          (circleDistance_y - rect.height/2)^2; 

     return (cornerDistance_sq <= (circle.r^2)); 
     else 
      return false 
    end 
end 

我就確定給圈r財產，並使其20。我沒有收到任何錯誤。當矩形接近圓時，矩形會被刪除（當矩形碰到圓的中心時，函數返回true，但我可能是錯的）。我在轉換中做錯了什麼？

Answer 1

改變這些兩行：

local circleDistance_x = math.abs(circle.x - rect.x - rect.width/2); 
    local circleDistance_y = math.abs(circle.y - rect.y - rect.height/2); 

要：

local circleDistance_x = math.abs(circle.x+circle.r - rect.x - rect.width/2) 
    local circleDistance_y = math.abs(circle.y+circle.r - rect.y - rect.height/2) 

似乎這樣的伎倆。歡呼隨機猜測！