问题描述
我终于解决了有关文本未显示在游戏中的问题，现在下一个问题是它不会更新。应该发生的是，当我按向上和向下箭头键时，所选文本将更改，然后按Enter将使我进入新的状态，或者退出游戏。
我的StartState = Class{__includes = BaseState}
local option = 1
function StartState:update(dt)
if love.keyboard.waspressed('up') then
if option == 1 then
option = 2
else
option = 1
end
elseif love.keyboard.waspressed('down') then
if option == 2 then
option = 1
else
option = 2
end
end
if love.keyboard.waspressed('enter') then
if option == 1 then
gStateMachine:change('play')
else
gStateMachine:change('quit')
end
end
end
function StartState:render()
local backgroundWidth = gTextures['start-background']:getWidth()
local backgroundHeight = gTextures['start-background']:getHeight()
love.graphics.draw(gTextures['start-background'],VIRTUAL_WIDTH / (backgroundWidth - 1),VIRTUAL_HEIGHT / (backgroundHeight - 1))
love.graphics.setFont(gFonts['large'])
love.graphics.setColor(153/255,217/255,234/255,255/255)
love.graphics.printf('Attack Them All',VIRTUAL_HEIGHT / 2 - 50,VIRTUAL_WIDTH,'center')
love.graphics.setFont(gFonts['medium'])
love.graphics.setColor(0/255,0/255,255/255)
love.graphics.printf('Play',(VIRTUAL_HEIGHT / 2) + 2,VIRTUAL_WIDTH + 2,'center')
love.graphics.printf('Quit',(VIRTUAL_HEIGHT / 2) + 22,'center')
if option == 1 then
love.graphics.setColor(255/255,174/255,201/255,255/255)
love.graphics.printf('Play',(VIRTUAL_HEIGHT / 2),'center')
love.graphics.setColor(237/255,28/255,36/255,255/255)
love.graphics.printf('Quit',(VIRTUAL_HEIGHT / 2) + 20,'center')
else
love.graphics.setColor(237/255,'center')
love.graphics.setColor(255/255,'center')
end
love.graphics.setColor(255/255,255/255,255/255)
end
中的代码现在看起来像这样：
StateMachine我已经在main.lua文件上添加了function love.load()
love.graphics.setDefaultFilter('nearest','nearest')
math.randomseed(os.time())
love.window.setTitle('Attack Them All')
push:setupScreen(VIRTUAL_WIDTH,VIRTUAL_HEIGHT,WINDOW_WIDTH,WINDOW_HEIGHT,{
vsync = true,fullscreen = false,resizable = true
})
gStateMachine = StateMachine {
['start'] = function() return StartState() end,['play'] = function() return PlayState() end,['quit'] = function() return QuitState() end
}
gStateMachine:change('start')
end
function love.update(dt)
gStateMachine:update(dt)
end
：
photoOutput(_:didFinishProcessingPhoto:error:)我在做什么错了？
解决方法
love.keyboard.wasPressed不是标准的Love2D API。应该在代码的其他地方实现吗？首先检查。
然后尝试在应该执行代码的条件中放入print("condition xxx is verified")，然后在未验证条件的地方找到
示例：
if love.keyboard.wasPressed('up') then
print("up is pressed")
...