LOVE中使用Lua进行一键动画

最近我熟悉了LOVE 2D中的Lua，并观看了一些教程，现在正在尝试制作一个简单的游戏。游戏将有一个能够奔跑的角色，并且按下空格键可以进行攻击（用他的剑打击）。按下空格键时，应该遍历所有攻击动画的帧/精灵。但是角色并未经历所有帧，并且它们之间的间隔似乎非常快，即使我将它保持在最小值。

这是我用来处理按键的代码。

self.animations = {
        ['idle'] = Animation{
            frames = {
                self.frames[1]
            },
            interval = 1
        },
        ['attack'] = Animation{
            frames = {
                self.frames[1], self.frames[2], self.frames[3], self.frames[4], self.frames[5], self.frames[6], self.frames[3]
            },
            interval = 0.25
        }
    }

    self.animation = self.animations['idle']
    self.currentFrame = self.animation:getCurrentFrame()

    self.behaviors = {
        ['idle'] = function(dt)

            if love.keyboard.wasPressed('space') then
                self.dy = 0
                self.state = 'attack'
                self.animation = self.animations['attack']
            elseif love.keyboard.wasPressed('up') then
                self.dy = -MOVE_DIST
            elseif love.keyboard.wasPressed('down') then
                self.dy = MOVE_DIST
            else
                self.dy = 0
            end
        end,
        ['attack'] = function(dt)
            self.animation = self.animations['attack']
            if love.keyboard.wasPressed('up') then
                self.dy = -MOVE_DIST
            elseif love.keyboard.wasPressed('down') then
                self.dy = MOVE_DIST
            else
                self.dy = 0
                self.state = 'idle'
                self.animation = self.animations['idle']
            end
        end

这是我的animation类，负责转换效果

Animation = Class{}

function Animation:init(params)
    --self.texture = params.texture
    self.frames = params.frames
    self.interval = params.interval or 0.05
    self.timer = 0
    self.currentFrame = 1

end

function Animation:getCurrentFrame()
    return self.frames[self.currentFrame]
end

function Animation:restart()
    self.timer = 0
    self.currentFrame = 1
end

function Animation:update(dt)
    self.timer = self.timer + dt

    if #self.frames == 1 then
        return self.currentFrame

    else
        while self.timer > self.interval do
            self.timer = self.timer - self.interval

            self.currentFrame = (self.currentFrame + 1) % (#self.frames + 1)

            if self.currentFrame == 0 then
                self.currentFrame = 1
            end
        end
    end
end

请帮忙。我希望我已经正确地提出了问题。先谢谢了。