screenspace coords was much easier than expected

src/drawables/polygon.rs

@@ -61,7 +61,7 @@ impl Polygon {
     }
 }
 impl Drawable for Polygon {
-    fn get(&self) -> Vec<VertexType> {
+    fn get(&self, window_size: (u32, u32)) -> Vec<VertexType> {
         vec![self.verts.clone()]
     }