Lua / Corona SDK / LOOP产卵 /位置差异 /帧率独立动画

Question

因此，在使用Corona SDK构建手机游戏时，我最近遇到了一个问题，我无法解决，这些问题是在循环中产生显示对象时的位置差异。我得到了一些帮助，发现这必须与框架独立动画有关。但是现在我面对的是：

尽管我在这里使用Framerate独立动画，但这也会产生同样的问题。如下所示，这可以通过提高循环速度来强调这一点。您对此有何看法？

local loopSpeed =  306
local loopTimerSpeed = 1000
local gapTable = {}
local gapLoopTimer
local frameTime
local gap
--enterFrame for time only
    local function frameTime(event)
        frameTime = system.getTimer()
    end
--enterFrame
    local function enterFrame(self, event)
        local deltaTime = frameTime - self.time
        print(deltaTime/1000)
        self.time = frameTime
        local speed = self.rate * deltaTime / 1000
        self:translate(speed, 0)
    end
--loop speed function
local function setLoopSpeed(factor)
    loopSpeed = loopSpeed * factor
    loopTimerSpeed = loopTimerSpeed / factor
end
--set the loop speed
    setLoopSpeed(3)
--loop to create gaps
local function createGap()
    gap = display.newRect(1, 1, 308, 442)
    gap.time = system.getTimer()
    gap.anchorX = 1
    gap.anchorY = 0
    --animation
        gap.rate = loopSpeed
        gap.enterFrame = enterFrame
        Runtime:addEventListener("enterFrame", gap)
    --fill table for cleaning up
        table.insert(gapTable, gap)
    --cleaning up
        for i = #gapTable, 1, -1 do
            local thisGap = gapTable[i]
            if thisGap.x > display.contentWidth + 500 then
                display.remove(thisGap)
                table.remove(gapTable, i)
                Runtime:removeEventListener("enterFrame", thisGap)
            end
            thisGap = nil
        end
end
Runtime:addEventListener("enterFrame", frameTime)
gapLoopTimer = timer.performWithDelay(
    loopTimerSpeed,
    createGap,
    0
)

Answer 1

如果您可以在rects之间设置差距大小，请尝试使用下面的代码

local gapTable = {}
local gapWidth = 50
local runtime = 0
local speed = 20
local gap
local function getDeltaTime()
    local temp = system.getTimer()  -- Get current game time in ms
    local dt = (temp-runtime) / (1000/display.fps)  -- 60 fps or 30 fps as base
    runtime = temp  -- Store game time
    return dt
end
local function enterFrame()
    local dt = getDeltaTime()
    for i=1, #gapTable do
        gapTable[i]:translate(speed * dt, 0)
    end    
end
local function createGap()
    local startX = 0
    if #gapTable > 0 then
        startX = gapTable[#gapTable].x - gapWidth - gapTable[#gapTable].width
    end 
    gap = display.newRect(startX, 1, 308, 442)
    gap.anchorX, gap.anchorY = 1, 0
    table.insert(gapTable, gap)
    --cleaning up
    for i=#gapTable, 1, -1 do
        if gapTable[i].x > display.contentWidth + 500 then
            local rect = table.remove(gapTable, i)
            if rect ~= nil then
                display.remove(rect)
                rect = nil
            end    
        end
    end
end
timer.performWithDelay(100, createGap,  0)
Runtime:addEventListener("enterFrame", enterFrame) 

希望这会有所帮助：）