Question

我想用拖动事件移动精灵表的帧。精灵实例必须只在用户拖动时播放。如果他举起手，它必须暂停。有什么方法可以这样做吗？

Answer 1

require "sprite"

-- A sprite sheet with a green dude
local sheet = sprite.newSpriteSheet( "greenman.png", 128, 128 )

local spriteSet = sprite.newSpriteSet(sheet, 1, 15)
sprite.add( spriteSet, "man", 1, 15, 200, 0 ) -- play 15 frames every 200 ms

local instance = sprite.newSprite( spriteSet )
instance.x = display.contentWidth / 2
instance.y = display.contentHeight / 2

instance:prepare("man")


local function startDrag( event )
    local t = event.target

    local phase = event.phase

    if "began" == phase then
        display.getCurrentStage():setFocus( t )
        t.isFocus = true

        -- Store initial position
        t.x0 = event.x - t.x
        t.y0 = event.y - t.y

    elseif t.isFocus then
        if "moved" == phase then
            t.x = event.x - t.x0
            t.y = event.y - t.y0

            t:play()

        elseif "ended" == phase or "cancelled" == phase then
            display.getCurrentStage():setFocus( nil )
            t.isFocus = false

            t:pause()

        end
    end

    -- Stop further propagation of touch event!
    return true
end


instance:addEventListener( "touch", startDrag )

在触摸事件的移动阶段播放精灵实例

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