Lua Gideros:触控2线

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画一条直线到鼠标向上。以下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管用吗？谢谢!

这是我另一个问题的第二部分。

Answer 1

如果你不工作，你的意思是什么都没有发生，屏幕上也没有画什么，那是因为你没有把你的形状添加到舞台上。

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)