圆形矩形碰撞检测在 Corona SDK 中不起作用

Question

我需要摆脱游戏中的物理因素，因此我需要实现自定义碰撞检测函数（每一帧都会调用碰撞检测函数）。我想检查一个矩形是否与一个圆相交。我从这里获取了代码（e.James的答案）：

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));
}

并更改了它对此：

--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

我确保给圆一个 r 属性并将其设置为 20。我没有收到任何错误。当矩形靠近圆时，它们就会被删除（看起来当矩形到达圆的中心时，函数返回 true，但我可能是错的）。我在转换过程中做错了什么吗？

Answer 1

更改这两行：

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

To：

    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)

似乎可以解决问题。随机猜测万岁！