Add dimension-tripper theme

(Sourced from shakesoda/stepmania.)

Themes/dimension-tripper/Graphics/MusicWheelItem SectionExpanded NormalPart.lua

@@ -0,0 +1,27 @@
+local t = Def.ActorFrame {}
+
+local Metric = function(c,k) return tonumber(THEME:GetMetric(c, k)) end
+local width = Theme.MusicWheelItemWidth()
+local height = Metric("MusicWheel", "ItemHeight")
+local offset = Metric("MusicWheel", "ItemOffset")
+
+-- background top
+t[#t+1] = Def.Quad {}
+t[#t].InitCommand = function(self)
+	self:x(offset)
+	self:vertalign(bottom)
+	self:setsize(width, height/2)
+	self:diffuse({0.1, 0.1, 0.1, 0.6})
+end
+
+-- background bottom
+t[#t+1] = Def.Quad {}
+t[#t].InitCommand = function(self)
+	self:x(offset)
+	self:vertalign(top)
+	self:setsize(width, height/2)
+	self:diffusebottomedge({0.2, 0.2, 0.2, 0.6})
+	self:diffusetopedge({0.1, 0.1, 0.1, 0.6})
+end
+
+return t