spine-runtimes/spine-lua/Skeleton.lua

-------------------------------------------------------------------------------
-- Spine Runtimes Software License
-- Version 2.1
-- 
-- Copyright (c) 2013, Esoteric Software
-- All rights reserved.
-- 
-- You are granted a perpetual, non-exclusive, non-sublicensable and
-- non-transferable license to install, execute and perform the Spine Runtimes
-- Software (the "Software") solely for internal use. Without the written
-- permission of Esoteric Software (typically granted by licensing Spine), you
-- may not (a) modify, translate, adapt or otherwise create derivative works,
-- improvements of the Software or develop new applications using the Software
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-- notices on or in the Software, including any copy thereof. Redistributions
-- in binary or source form must include this license and terms.
-- 
-- THIS SOFTWARE IS PROVIDED BY ESOTERIC SOFTWARE "AS IS" AND ANY EXPRESS OR
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-- EVENT SHALL ESOTERIC SOFTARE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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-------------------------------------------------------------------------------

local Bone = require "spine-lua.Bone"
local Slot = require "spine-lua.Slot"
local AttachmentLoader = require "spine-lua.AttachmentLoader"

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

	local self = {
		data = skeletonData,
		bones = {},
		slots = {},
		slotsByName = {},
		drawOrder = {},
		r = 1, g = 1, b = 1, a = 1,
		x = 0, y = 0,
		skin = nil,
		flipX = false, flipY = false,
		time = 0
	}

	function self:updateWorldTransform ()
		for i,bone in ipairs(self.bones) do
			bone:updateWorldTransform(self.flipX, self.flipY)
		end
	end

	function self:setToSetupPose ()
		self:setBonesToSetupPose()
		self:setSlotsToSetupPose()
	end

	function self:setBonesToSetupPose ()
		for i,bone in ipairs(self.bones) do
			bone:setToSetupPose()
		end
	end

	function self:setSlotsToSetupPose ()
		for i,slot in ipairs(self.slots) do
			self.drawOrder[i] = slot
			slot:setToSetupPose()
		end
	end

	function self:getRootBone ()
		return self.bones[1]
	end

	function self:findBone (boneName)
		if not boneName then error("boneName cannot be nil.", 2) end
		for i,bone in ipairs(self.bones) do
			if bone.data.name == boneName then return bone end
		end
		return nil
	end

	function self:findSlot (slotName)
		if not slotName then error("slotName cannot be nil.", 2) end
		return self.slotsByName[slotName]
	end

	function self:setSkin (skinName)
		local newSkin
		if skinName then
			newSkin = self.data:findSkin(skinName)
			if not newSkin then error("Skin not found = " .. skinName, 2) end
			if self.skin then
				-- Attach all attachments from the new skin if the corresponding attachment from the old skin is currently attached.
				for k,v in pairs(self.skin.attachments) do
					local attachment = v[3]
					local slotIndex = v[1]
					local slot = self.slots[slotIndex]
					if slot.attachment == attachment then
						local name = v[2]
						local newAttachment = newSkin:getAttachment(slotIndex, name)
						if newAttachment then slot:setAttachment(newAttachment) end
					end
				end
			else
				-- No previous skin, attach setup pose attachments.
				for i,slot in ipairs(self.slots) do
					local name = slot.data.attachmentName
					if name then
						local attachment = newSkin:getAttachment(i, name)
						if attachment then slot:setAttachment(attachment) end
					end
				end
			end
		end
		self.skin = newSkin
	end

	function self:getAttachment (slotName, attachmentName)
		if not slotName then error("slotName cannot be nil.", 2) end
		if not attachmentName then error("attachmentName cannot be nil.", 2) end
		local slotIndex = skeletonData.slotNameIndices[slotName]
		if slotIndex == -1 then error("Slot not found = " .. slotName, 2) end
		if self.skin then
			local attachment = self.skin:getAttachment(slotIndex, attachmentName)
			if attachment then return attachment end
		end
		if self.data.defaultSkin then
			return self.data.defaultSkin:getAttachment(slotIndex, attachmentName)
		end
		return nil
	end

	function self:setAttachment (slotName, attachmentName)
		if not slotName then error("slotName cannot be nil.", 2) end
		for i,slot in ipairs(self.slots) do
			if slot.data.name == slotName then
				if not attachmentName then 
					slot:setAttachment(nil)
				else
					slot:setAttachment(self:getAttachment(slotName, attachmentName))
				end
				return
			end
		end
		error("Slot not found = " .. slotName, 2)
	end

	function self:update (delta)
		self.time = self.time + delta
	end

	function self:setColor (r, g, b, a)
		self.r = r
		self.g = g
		self.b = b
		self.a = a
	end

	for i,boneData in ipairs(skeletonData.bones) do
		local parent
		if boneData.parent then parent = self.bones[spine.utils.indexOf(skeletonData.bones, boneData.parent)] end
		table.insert(self.bones, Bone.new(boneData, parent))
	end

	for i,slotData in ipairs(skeletonData.slots) do
		local bone = self.bones[spine.utils.indexOf(skeletonData.bones, slotData.boneData)]
		local slot = Slot.new(slotData, self, bone)
		table.insert(self.slots, slot)
		self.slotsByName[slot.data.name] = slot
		table.insert(self.drawOrder, slot)
	end

	return self
end
return Skeleton