随机选择对象并更改所选对象的颜色

Question

我有 4 个当前为黑色的圆圈 {'c1','c2','c3','c4'}。我正在尝试设置它以便选择其中一个圆圈并且它的颜色从黑色变为红色。我设法让它在圆列表中打印出一个随机实体。但我无法让它改变随机选择的圆圈的颜色。抱歉，我对此还是很陌生。

local composer = require( "composer" )
local scene = composer.newScene()

-- "scene:create()"
function scene:create( event )

    local sceneGroup = self.view

    local backgroundimg = display.newRect( 0,0,576,320 )
    backgroundimg.x = display.contentWidth*0.5
    backgroundimg.y = display.contentHeight*0.5
    sceneGroup:insert( backgroundimg )

    local pause = display.newImage( "image/pauseBTN.png" )
    pause.x = 508
    pause.y = 20
    sceneGroup:insert( pause )


    circle = {'c1','c2','c3','c4'}


    local function choice ( event )
        randCircle = circle[ math.random( #circle ) ]
        print(randCircle)
    end

    timer.performWithDelay( 3000, choice, 0 )

    local function tapListener( event )

    end

    c1 = display.newCircle( 75,100,75 )
    c1:setFillColor( 0,0,0 )
    sceneGroup:insert( c1 )
    c1:addEventListener( "tap", tapListener )

    c2 = display.newCircle( 300,100,75 )
    c2:setFillColor(0,0,0)
    sceneGroup:insert( c2 )
    c2:addEventListener( "tap", tapListener )

    c3 = display.newCircle( 187.5,225,75 )
    c3:setFillColor(0,0,0)
    sceneGroup:insert( c3 )
    c3:addEventListener( "tap", tapListener )

    c4 = display.newCircle( 412.5,225,75 )
    c4:setFillColor(0,0,0)
    sceneGroup:insert( c4 )
    c4:addEventListener( "tap", tapListener )

end


-- "scene:show()"
function scene:show( event )

    local sceneGroup = self.view
    local phase = event.phase

    if ( phase == "will" ) then

    elseif ( phase == "did" ) then

    end
end


-- "scene:hide()"
function scene:hide( event )

    local sceneGroup = self.view
    local phase = event.phase

    if ( phase == "will" ) then

    elseif ( phase == "did" ) then

    end
end


-- "scene:destroy()"
function scene:destroy( event )

    local sceneGroup = self.view

end


-- Listener setup
scene:addEventListener( "create", scene )
scene:addEventListener( "show", scene )
scene:addEventListener( "hide", scene )
scene:addEventListener( "destroy", scene )

return scene

Answer 1

您需要实际的对象，而不是字符串：

circle = {c1, c2, c3 ,c4}

该行应在创建圆之后执行。

在定义choice之前，添加

local circle

随机选择对象并更改所选对象的颜色

Randomly choose objects and change colour of object chosen

lua

function

list

coronasdk