Add UVManager

UVManager.lua

@@ -0,0 +1,62 @@
+local mt={}
+--- @class UVManager
+UVManager = {
+	step=vec(0,0),
+	offset=vec(0,0),
+	positions={},
+	part=nil,
+	dimensions=nil
+}
+mt.__index=UVManager
+--- @return UVManager
+--- @param step Vector2 A vector representing the distance between UVs
+--- @param offset Vector2 A vector represnting the starting point for UVs, or nil
+--- @param positions table A dictionary of names and offset vectors
+--- @param part ModelPart Model part to manage
+function UVManager.new(self, step, offset, positions, part)
+	local t={}
+	if step ~= nil then t.step=step end
+	if offset ~= nil then t.offset=offset end
+	if positions ~= nil then t.positions=positions end
+
+	if part ~= nil then
+		UVManager.setPart(t, part)
+	end
+
+	t=setmetatable(t, mt)
+	return t
+end
+
+--- @param part ModelPart Model part to manage
+function UVManager.setPart(self, part)
+	self.part=part
+	self.dimensions=part:getTextureSize()
+end
+
+function UVManager.getUV(self, input)
+	local vect={}
+	local stp=self.step
+	local offset=self.offset
+	if type(input) == "string" then
+		if self.positions[input] == nil then return nil end
+		vect=self.positions[input]
+	else
+		vect=vectors.of(input)
+	end
+	local u=offset.x+(vect.x*stp.x)
+	local v=offset.y+(vect.y*stp.y)
+	if self.dimensions ~= nil then
+		-- TODO override for my specific texture, replace this with matrix stuff
+		-- (get rid of division once you figure out how setUVMatrix works)
+		return vec(u/(self.dimensions.x/2), v/(self.dimensions.y/2))
+	else
+		return util.UV{u, v}
+	end
+end
+
+function UVManager.setUV(self, input)
+	if self.part == nil then return false end
+	self.part:setUV(self:getUV(input))
+end
+
+return UVManager