如何檢測lua愛情引擎中的poly線與碰撞？

Question

我正在使用lua愛情引擎來製作一個簡單的遊戲。然而，即時通訊碰撞有點麻煩。

我在一組點（代表岩石地面）和一個箱子之間有一條折線，但我不能想到一個簡單的實現。

love.graphics.line(0,60, 100,70, 150,300, 200,230, 250,230, 300,280, 350,220, 400,220, 420,150, 440,140, 480,340) 

如果有人可以幫助使用代碼片段或建議，將不勝感激。

Answer 1

您需要創建一個更加抽象的地面表示形式，從中可以生成圖形的線條和物理體。

因此，例如：

--ground represented as a set of points 
local ground = {0,60, 100,70, 150,300, 200,230, 250,230, 300,280, 350,220, 400,220, 420,150, 440,140, 480,340} 

這可能不是最好的表現，但我會繼續我的例子。

現在，您已經有了地面的表示，現在您可以轉換物理知識（進行碰撞）以及圖形顯示可以理解的東西（確實可以理解）。所以，你聲明瞭兩個功能：

--converts a table representing the ground into something that 
--can be understood by your physics. 
--If you are using love.physics then this would create 
--a Body with a set PolygonShapes attached to it. 
local function createGroundBody(ground) 
    --you may need to pass some additional arguments, 
    --such as the World in which you want to create the ground. 
end 

--converts a table representing the ground into something 
--that you are able to draw. 
local function createGroundGraphic(ground) 
    --ground is already represented in a way that love.graphics.line can handle 
    --so just pass it through. 
    return ground 
end 

現在，把他們放在一起：

local groundGraphic = nil 
local groundPhysics = nil 
love.load() 
    groundGraphic = createGroundGraphic(ground) 
    physics = makePhysicsWorld() 
    groundPhysics = createGroundBody(ground) 

end 

love.draw() 
    --Draws groundGraphic, could be implemented as 
    --love.graphics.line(groundGraphic) 
    --for example. 
    draw(groundGraphic) 
    --you also need do draw the box and everything else here. 
end 

love.update(dt) 
    --where `box` is the box you have to collide with the ground. 
    runPhysics(dt, groundPhysics, box) 
    --now you need to update the representation of your box graphic 
    --to match up with the new position of the box. 
    --This could be done implicitly by using the representation for physics 
    --when doing the drawing of the box. 
end 

不正是你要如何實現物理和繪圖知道，這是很難給出比這個更詳細。我希望你用這個例子來說明這個代碼的結構。我提出的代碼只是一個非常近似的結構，所以它不會接近實際工作。請詢問我一直不清楚的事情！