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colorTransition.lua
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colorTransition.lua
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-- Color transition wrapper
-- Author: atoko
-- Release date: 5/9/2012
-- Version: 1.0.0
--
--
--
--Description:
-- This is a wrapper for changing fill color within a transition
-- Time, delay and easing values are optional
--
--Usage:
-- cTrans = require( "colortransition" );
--
-- cTrans:colorTransition(displayObject, colorFrom, colorTo, [time], [delay], [easing]);
-- ex:
--
-- local rect = display.newRect(0,0,250,250);
-- local white = {255,255,255}
-- local red = {255,0,0};
--
-- cTrans:colorTransition(rect, white, red, 1200);
local _M = {}
--Local reference to transition function
_M.callback = transition.to;
function _M:colorTransition(obj, colorFrom, colorTo, time, delay, ease)
local _obj = obj;
local ease = ease or easing.linear
local fcolor = colorFrom or {255,255,255}; -- defaults to white
local tcolor = colorTo or {0,0,0}; -- defaults to black
local t = nil;
local p = {} --hold parameters here
local rDiff = tcolor[1] - fcolor[1]; --Calculate difference between values
local gDiff = tcolor[2] - fcolor[2];
local bDiff = tcolor[3] - fcolor[3];
--Set up proxy
local proxy = {step = 0};
local mt = {
__index = function(t,k)
--print("get");
return t["step"]
end,
__newindex = function (t,k,v)
--print("set")
--print(t,k,v)
if(_obj.setFillColor) then
_obj:setFillColor(fcolor[1] + (v*rDiff) ,fcolor[2] + (v*gDiff) ,fcolor[3] + (v*bDiff) )
end
t["step"] = v;
end
}
p.time = time or 1000; --defaults to 1 second
p.delay = delay or 0;
p.transition = ease;
setmetatable(proxy,mt);
p.colorScale = 1;
t = self.callback(proxy,p , 1 ) ;
return t
end
return _M;