高級MySQL區域成本

Question

我有點兒熟悉MySQL，但考慮實現這個功能會讓我的大腦受傷。我需要一個系統，您可以設置一個區域的「成本」，例如，在座標X = 20 Y = 20 WIDTH = 20 HEIGHT = 20之間，以每像素15個爲代價，現在如果您在此區域內放置另一個區域， X = 25，Y = 25，WIDTH = 10，HEIGHT = 10，每個像素5個成本，先前的區域被分解成4個部分，中間被擦掉以利於該區域。

我還希望能夠計算某個像素之間區域的「成本」。希望我已經以大多數人會理解的方式解釋了這一點。我不知道從哪裏開始。

Answer 1

我會通過存儲具有優先級的所有區域，然後逐個像素地獲取成本來解決這個問題。

因此，對於單個像素的成本將是：

select c.* 
from costs c 
where PIXELX between c.x and c.x + c.deltax and PIXELY between c.y + c.deltay 
order by priority desc 
limit 1 

將其擴展到像素的面積，您將面積擴大到一組像素。我建議有一個numbers表，以幫助這一點：

select x.num as x, y.num as y 
from numbers x cross join 
    numbers y 
where x.num between PIXELX and PIXELX and DELTAX and 
     y.num between PIXELY and PIXELY and DELTAY 

現在，結合這些想法，讓一個給定像素的所有可能產生的費用：

select x.num as x, y.num as y, max(priority) as maxpriority 
from numbers x cross join 
    numbers y join 
    costs c 
    on x.num between c.x and c.x + c.deltax and y.num between c.y + c.deltay 
where x.value between PIXELX and PIXELX and DELTAX and 
     y.value between PIXELY and PIXELY and DELTAY 
group by x.num, y.num 

最後，加入在給定的費用優先級：

select sum(c.cost) 
from (select x.num as x, y.num as y, max(priority) as maxpriority 
     from numbers x cross join 
      numbers y join 
      costs c 
      on x.num between c.x and c.x + c.deltax and y.num between c.y + c.deltay 
     where x.value between PIXELX and PIXELX and DELTAX and 
      y.value between PIXELY and PIXELY and DELTAY 
     group by x.num, y.num 
    ) xyp join 
    costs c 
    on xyp.x between c.x and c.x + c.deltax and xyp.y between c.y + c.deltay and 
     xyp.maxpriority = c.priority 

Answer 2

考慮實施此功能使我的大腦受到傷害

是的，我的！嗯...這聽起來很熟悉，但 - 因爲它已經做過的milliondollarhomepage

也許你也可以使用或改編預製的解決方案，如Gpix否則谷歌「像素廣告腳本」。