spine-runtimes/spine-lua/BoundingBoxAttachment.lua

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local AttachmentType = require "spine-lua.AttachmentType"

local BoundingBoxAttachment = {}
function BoundingBoxAttachment.new (name)
	if not name then error("name cannot be nil", 2) end

	local self = {
		name = name,
		type = AttachmentType.boundingbox,
		vertices = {}
	}

	function self:computeWorldVertices (x, y, bone, worldVertices)
		x = x + bone.worldX
		y = y + bone.worldY
		local m00 = bone.m00
		local m01 = bone.m01
		local m10 = bone.m10
		local m11 = bone.m11
		local vertices = self.vertices
		local count = #vertices
		for i = 1, count, 2 do
			local px = vertices[i]
			local py = vertices[i + 1]
			worldVertices[i] = px * m00 + py * m01 + x
			worldVertices[i + 1] = px * m10 + py * m11 + y
		end
	end

	return self
end
return BoundingBoxAttachment