feat: Stock composition diagram stub

src/stock_index_composition.jl

@@ -0,0 +1,52 @@
+using Base
+import Luxor as L
+
+@kwdef struct Component
+    pos::Tuple{UInt, UInt}
+    size::Tuple{UInt, UInt}
+    name::String
+    diff::Real
+end
+@kwdef struct CompositionDiagram
+    components::Array{Component}
+end
+
+"""
+Draws stock index composition chart
+"""
+function draw(diagram::CompositionDiagram, size=(800, 600))
+    L.Drawing(size[1], size[2], :png)
+    L.background("black")
+    L.sethue("white")
+    for component in diagram.components
+        pos = L.Point(component.pos)
+        if component.diff > 0
+            L.setcolor("green")
+        else
+            L.setcolor("red")
+        end
+        L.rect(pos, component.size[1], component.size[2], action = :fillstroke)
+        L.setcolor("white")
+        L.settext(
+            component.name,
+            L.Point(component.pos .+ component.size ./ 2),
+            halign="center",
+            valign="bottom",
+        )
+        L.settext(
+            "$(component.diff)%",
+            L.Point(component.pos .+ component.size ./ 2),
+            halign="center",
+            valign="top",
+        )
+    end
+    L.finish()
+end
+
+diagram = CompositionDiagram(
+    components=[
+        Component(pos=(0,0), size=(200,200),name="AAPL", diff=0.5),
+        Component(pos=(0,200), size=(200,100),name="GOOG", diff=-0.3),
+    ],
+)
+draw(diagram)