Question

我试图让一些盒子像摩天轮一样根据触摸输入旋转

所以想象一下屏幕上的摩天轮并将其中一个推车向下拖动会使滚轮单向旋转并向上拖动会以另一种方式旋转滚轮

摩天轮上的每个盒子或“推车”都不会旋转，它们只会以圆周运动的方式移动，就像摩天轮一样

我现在几乎都有这个工作，但是我的盒子正在远离最初的抓点因此，当我触摸其中一个盒子时，它会很快出现在其他地方，但随后正常旋转，我希望它从最初的抓点继续顺利旋转

这是我目前的代码

local squares = display.newGroup()

local square = display.newRect(0,0,200,200)
square.x, square.y = 320, 320
square:setFillColor(100,255,55)
squares:insert(square)

local square2 = display.newRect(0,0,200,200)
square2.x, square2.y = 320, 320
square2:setFillColor(999,255,55)
squares:insert(square2)

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

local phase = event.phase
if "began" == phase then

    local parent = t.parent
    parent:insert( t )
    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

   local degrees = event.y

        local rads = degrees * (math.pi / 360.0)
            square.x = 300 * math.cos(rads) + 500
            square.y = 300 * math.sin(rads)+ 500
            degrees = degrees + 100
           print (square.x, square.y)

         local rads2 = degrees * (math.pi / 360.0)
            square2.x = 300 * math.cos(rads2)+ 500
            square2.y = 300 * math.sin(rads2)+ 500
            degrees = degrees - 100

           print (square.x, square.y)




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


squares:addEventListener( "touch", onTouch )

请随时指出我所犯的任何愚蠢的错误如果你能告诉我如何获得相同的效果，但围绕另一个对象而不是一点，我会非常感激，谢谢

Answer 1

这是一个完整的工作示例。

local squares = display.newGroup()

local wheelX =  display.contentCenterX
local wheelY =  display.contentCenterY

local radius = 220
local degrees = -180
local squareH = 150

local square = display.newRect(0,0,squareH,squareH)
square:setFillColor(255,255,255)
square.degStart = 100
squares:insert(square)

local square2 = display.newRect(0,0,squareH,squareH)
square2:setFillColor(999,255,55)
square2.degStart = -10
squares:insert(square2)


local function drawRects(degrees)
    local rads = (square.degStart + degrees) * (math.pi / 180.0)
    square.x = radius * math.cos(rads) + wheelX
    square.y = radius * math.sin(rads) + wheelY

    local rads2 = (square2.degStart + degrees) * (math.pi / 180.0)
    square2.x = radius * math.cos(rads2) + wheelX
    square2.y = radius * math.sin(rads2) + wheelY
end

local function getDegrees(square)
    local x = square.x
    local y = square.y

    local degrees = math.atan2((y - wheelY) , (x - wheelX)) * (180 / math.pi)

    return degrees
end


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

    local phase = event.phase
    local parent = t.parent

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

        square.degStart = getDegrees(square)
        square2.degStart = getDegrees(square2)
    elseif t.isFocus then
        if "moved" == phase then
            degrees = math.atan2((event.yStart - wheelY) , (event.xStart - wheelX)) * (180 / math.pi)

            degrees2 = math.atan2((event.y - wheelY) , (event.x - wheelX)) * (180 / math.pi)

            diffDegrees = degrees2 - degrees
            drawRects(diffDegrees)

            print("diffDegrees: " .. diffDegrees)
        elseif "ended" == phase or "cancelled" == phase then
            display.getCurrentStage():setFocus( nil )
            t.isFocus = false
        end
    end
return true
end

squares:addEventListener( "touch", onTouch )

drawRects(degrees)

我花了很多时间。

Answer 2

您应该尝试获取event.y和event.x，然后使用公式检索度数：

degrees = Math.atan(event.y / event.x)

使用触摸电晕sdk在点或其他物体周围旋转物体

2 个答案: