moved to rust style file tree

src/canvas/canvas_frame.rs

@@ -0,0 +1,48 @@
+use crate::util::vertex_3d::{Vertex3D};
+use std::sync::Arc;
+use std::collections::HashMap;
+use crate::canvas::canvas_state::{Drawable, CanvasTextureHandle, CanvasImageHandle};
+
+///
+pub struct CanvasFrame {
+    pub colored_drawables: Vec<Vertex3D>,
+    pub textured_drawables: HashMap<Arc<CanvasTextureHandle>, Vec<Vec<Vertex3D>>>,
+    pub image_drawables: HashMap<Arc<CanvasImageHandle>, Vec<Vec<Vertex3D>>>,
+}
+
+impl CanvasFrame {
+
+    /// Creates a bare canvas frame with empty accumulators
+    pub fn new() -> CanvasFrame {
+        CanvasFrame {
+            colored_drawables: vec![],
+            textured_drawables: Default::default(),
+            image_drawables: Default::default(),
+        }
+    }
+
+    /// Accumulates the drawables collected Vertex2D's
+    pub fn draw(&mut self, drawable: &dyn Drawable) {
+        match drawable.get_texture_handle() {
+            Some(handle) => {
+                self.textured_drawables
+                    .entry(handle.clone())
+                    .or_insert(Vec::new())
+                    .push(drawable.collect());
+            }
+            None => {
+                match drawable.get_image_handle() {
+                    Some(handle) => {
+                        self.image_drawables
+                            .entry(handle.clone())
+                            .or_insert(Vec::new())
+                            .push(drawable.collect());
+                    }
+                    None => {
+                        self.colored_drawables.extend(drawable.collect());
+                    }
+                }
+            }
+        }
+    }
+}