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[Lua] CCPointで四則演算子を使う

Last updated at Posted at 2014-11-21

Cocos2d-x Luaバインディングで、

local p = ccp(10, 20) + ccp(100, 200)
print(p.x, p.y)  -- 110  220

のようなことをする方法.

local ccpmt = getmetatable(ccp(0,0))
function ccpmt.__add(a, b)
  return ccp(a.x+b.x, a.y+b.y)
end

同じように、__sub, __mul, __div, __lenあたりを定義すれば-, *, /, #
CCPointに対して使えるようになる.

Cocos2d-x3の場合はccpをcc.pに.

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