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A colour transition function for CoronaSDK in lua
function TransitionColor(displayObj, params)
if(params and params.startColor and params.endColor) then
local length = params.time or 300
local startTime = system.getTimer()
local easingFunc = params.transition or easing.linear
local function colorInterpolate(a,b,i,t)
colourTable = {
easingFunc(i,t,a[1],b[1]-a[1]),
easingFunc(i,t,a[2],b[2]-a[2]),
easingFunc(i,t,a[3],b[3]-a[3]),
}
if(b[4] and a[4]) then
easingFunc(i,t,a[4],b[4]-a[4])
end
return colourTable
end
displayObj.runFunc = function(event)
local runTime = system.getTimer()
if(startTime + length > runTime) then
displayObj:setFillColor(unpack(colorInterpolate(params.startColor, params.endColor, runTime-startTime, length)))
else
-- do it one last time to make sure we have the correct final color
displayObj:setFillColor(unpack(params.endColor))
Runtime:removeEventListener("enterFrame", displayObj.runFunc)
end
end
Runtime:addEventListener("enterFrame", displayObj.runFunc)
end
end
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