Lua Gideros: Line with touch 2

Question

在我使用 Lua 和 Gideros 工作室的游戏中，我希望有人从鼠标向下到鼠标向上画一条直线。这是我的代码不起作用：

local function onMouseDown(event)
    startx = event.x
    starty = event.y

    event:stopPropagation()
end

local function onMouseUp(event)
    endx = event.x
    endy = event.y
    local line = Shape.new()
    line:setLineStyle(5, 0x0000ff, 1)
    line:beginPath()
    line:moveTo(startx,starty)
    line:lineTo(endx,endy)
    line:endPath()
    event:stopPropagation()
end

place:addEventListener(Event.MOUSE_DOWN, onMouseDown)
place:addEventListener(Event.MOUSE_UP, onMouseUp)

有人知道为什么这不起作用吗？谢谢！

这是我的另一个问题的第 2 部分。

Answer 1

如果你说不工作，你的意思是什么都没有发生，屏幕上什么也没有画出来，那是因为你没有将你的形状添加到舞台层次

应该是这样的：

local line = Shape.new()
line:setLineStyle(5, 0x0000ff, 1)
--can add to stage or maybe place, 
--if that's what you are using for scene
stage:addChild(line)

local function onMouseDown(event)
    startx = event.x
    starty = event.y

    event:stopPropagation()
end

local function onMouseUp(event)
    line:beginPath()
    line:moveTo(startx,starty)
    line:lineTo(event.x,event.y)
    line:endPath()
    event:stopPropagation()
end

place:addEventListener(Event.MOUSE_DOWN, onMouseDown)
place:addEventListener(Event.MOUSE_UP, onMouseUp)