Question

我对Lua和Love2D完全不熟悉，可能根本不理解这些概念。这是一个Love2D教程，我想改变它，所以当我按下“a”时，例如，在键盘上，对象将交换（从仓鼠到汽车）等等。

你可以帮帮我吗？

-- Tutorial 1: Hamster Ball
-- Add an image to the game and move it around using
-- the arrow keys.
-- compatible with löve 0.6.0 and up

function love.load()
   hamster = love.graphics.newImage("hamster.png")
   auto = love.graphics.newImage("auto.png")
   x = 50
   y = 50
   speed = 300
end

function love.update(dt)
   if love.keyboard.isDown("right") then
      x = x + (speed * dt)
   end
   if love.keyboard.isDown("left") then
      x = x - (speed * dt)
   end

   if love.keyboard.isDown("down") then
      y = y + (speed * dt)
   end
   if love.keyboard.isDown("up") then
      y = y - (speed * dt)
   end
   if love.keyboard.isDown("escape") then
      love.event.quit()
   end
   if love.keyboard.isDown("a") then
      love.draw(auto,x,y)
   end
end

function love.draw()
   love.graphics.draw(hamster, x, y)
end

Answer 1

我建议使用love.update来更新状态。不要画画。然后在love.draw中完成所有绘图。解决方案可能是：

local state = {}

function love.load()
    hamster = love.graphics.newImage("hamster.png")
    auto = love.graphics.newImage("auto.png")
    state.activeImage = hamster
    state.activeImageName = "hamster"
    -- <snip> ...
end

function love.update(dt) 
    -- <snip> ... 
    if love.keyboard.isDown("a") then
        if state.activeImageName == "hamster" then
            state.activeImage = auto
            state.activeImageName = "auto"
        else
            state.activeImage = hamster
            state.activeImageName = "hamster"
        end
    end
end

function love.draw()
   love.graphics.draw(state.activeImage, x, y)
end

Answer 2

非常感谢Corbin，我认为没有“州”局部变量。你的解决方案对我很有启发。现在它正在发挥作用。

  -- Tutorial 1: Hamster Ball
    -- Add an image to the game and move it around using
    -- the arrow keys.
    -- compatible with löve 0.6.0 and up


    function love.load()
       hamster = love.graphics.newImage("hamster.png")
       auto = love.graphics.newImage("auto.png")
       activeImage = hamster
       activeImageName = "hamster"
       x = 50
       y = 50
       speed = 300
    end

    function love.update(dt)
       if love.keyboard.isDown("right") then
          x = x + (speed * dt)
       end
       if love.keyboard.isDown("left") then
          x = x - (speed * dt)
       end

       if love.keyboard.isDown("down") then
          y = y + (speed * dt)
       end
       if love.keyboard.isDown("up") then
          y = y - (speed * dt)
       end
       if love.keyboard.isDown("escape") then
          love.event.quit()
       end
       if love.keyboard.isDown("a") then
          activeImage = auto
          activeImageName = "auto"
       end
       if love.keyboard.isDown("h") then
          activeImage = hamster
          activeImageName = "hamster"
       end

    end

    function love.draw()
       love.graphics.draw(activeImage, x, y)
    end

love2d简单画画交换画面

2 个答案: