layout,sdl2-demo,egui: basic support for displaying two layers

src/bin/topola-egui/app.rs

@@ -138,33 +138,15 @@ impl eframe::App for App {
                 let transform = egui::emath::RectTransform::from_to(self.from_rect, viewport_rect);
                 let mut painter = Painter::new(ui, transform);
 
-                let dot_shape = Shape::Dot(DotShape {
-                    c: Circle {
-                        pos: [50.0, 100.0].into(),
-                        r: 10.0,
-                    },
-                });
-
-                let seg_shape = Shape::Seg(SegShape {
-                    from: [200.0, 25.0].into(),
-                    to: [300.0, 300.0].into(),
-                    width: 5.0,
-                });
-
-                let bend_shape = Shape::Bend(BendShape {
-                    from: [100.0, 100.0].into(),
-                    to: [160.0, 160.0].into(),
-                    c: Circle {
-                        pos: [130.0, 130.0].into(),
-                        r: 30.0,
-                    },
-                    width: 12.0,
-                });
-
                 if let Some(layout) = &self.layout {
-                    for node in layout.nodes() {
+                    for node in layout.layer_nodes(1) {
                         let shape = node.primitive(layout).shape();
-                        painter.paint_shape(&shape, egui::Color32::from_rgb(255, 0, 0));
+                        painter.paint_shape(&shape, egui::Color32::from_rgb(52, 52, 200));
+                    }
+
+                    for node in layout.layer_nodes(0) {
+                        let shape = node.primitive(layout).shape();
+                        painter.paint_shape(&shape, egui::Color32::from_rgb(200, 52, 52));
                     }
                 }
             })

src/bin/topola-sdl2-demo/main.rs

@@ -394,7 +394,18 @@ fn render_times(
         };
 
         //let result = panic::catch_unwind(|| {
-        for node in layout.nodes() {
+        for node in layout.layer_nodes(1) {
+            let color = if highlighteds.contains(&node) {
+                ColorU::new(100, 100, 255, 255)
+            } else {
+                ColorU::new(52, 52, 200, 255)
+            };
+
+            let shape = node.primitive(layout).shape();
+            painter.paint_shape(&shape, color, view.zoom);
+        }
+
+        for node in layout.layer_nodes(0) {
             let color = if highlighteds.contains(&node) {
                 ColorU::new(255, 100, 100, 255)
             } else {

src/layout/layout.rs

@@ -2,7 +2,7 @@ use contracts::debug_ensures;
 use enum_dispatch::enum_dispatch;
 use geo::Point;
 
-use rstar::RTreeObject;
+use rstar::{RTreeObject, AABB};
 use thiserror::Error;
 
 use super::graph::GetLayer;
@@ -630,20 +630,19 @@ impl<R: RulesTrait> Layout<R> {
             .map(|wrapper| wrapper.data)
     }
 
-    pub fn shapes(&self) -> impl Iterator<Item = Shape> + '_ {
+    pub fn layer_nodes(&self, layer: u64) -> impl Iterator<Item = GeometryIndex> + '_ {
-        self.nodes().map(|node| node.primitive(self).shape())
+        self.geometry_with_rtree
+            .rtree()
+            .locate_in_envelope_intersecting(&AABB::from_corners(
+                [-f64::INFINITY, -f64::INFINITY, layer as f64],
+                [f64::INFINITY, f64::INFINITY, layer as f64],
+            ))
+            .map(|wrapper| wrapper.data)
     }
 
     pub fn node_count(&self) -> usize {
         self.geometry_with_rtree.graph().node_count()
     }
-
-    fn node_indices(&self) -> impl Iterator<Item = GeometryIndex> + '_ {
-        self.geometry_with_rtree
-            .rtree()
-            .iter()
-            .map(|wrapper| wrapper.data)
-    }
 }
 
 impl<R: RulesTrait> Layout<R> {