egui: paint zones (only convex ones work for now)

src/bin/topola-egui/app.rs

@@ -5,7 +5,7 @@ use std::{
 };
 
 use topola::{
-    drawing::{graph::MakePrimitive, primitive::MakeShape, Drawing},
+    drawing::{graph::MakePrimitive, primitive::MakeShape, zone::MakePolygon, Drawing},
     dsn::{design::DsnDesign, rules::DsnRules},
     geometry::shape::{BendShape, DotShape, SegShape, Shape},
     math::Circle,
@@ -138,16 +138,30 @@ impl eframe::App for App {
                 let transform = egui::emath::RectTransform::from_to(self.from_rect, viewport_rect);
                 let mut painter = Painter::new(ui, transform);
 
-                if let Some(layout) = &self.drawing {
-                    for node in layout.layer_primitive_nodes(1) {
-                        let shape = node.primitive(layout).shape();
+                if let Some(drawing) = &self.drawing {
+                    for node in drawing.layer_primitive_nodes(1) {
+                        let shape = node.primitive(drawing).shape();
                         painter.paint_shape(&shape, egui::Color32::from_rgb(52, 52, 200));
                     }
 
-                    for node in layout.layer_primitive_nodes(0) {
-                        let shape = node.primitive(layout).shape();
+                    for zone in drawing.layer_zones(1) {
+                        painter.paint_polygon(
+                            &zone.polygon(&drawing),
+                            egui::Color32::from_rgb(52, 52, 200),
+                        )
+                    }
+
+                    for node in drawing.layer_primitive_nodes(0) {
+                        let shape = node.primitive(drawing).shape();
                         painter.paint_shape(&shape, egui::Color32::from_rgb(200, 52, 52));
                     }
+
+                    for zone in drawing.layer_zones(0) {
+                        painter.paint_polygon(
+                            &zone.polygon(&drawing),
+                            egui::Color32::from_rgb(200, 52, 52),
+                        )
+                    }
                 }
             })
         });

src/bin/topola-egui/painter.rs

@@ -1,9 +1,9 @@
-use egui::{emath::RectTransform, epaint, Color32, Pos2, Ui};
-use geo::Point;
+use egui::{emath::RectTransform, epaint, Color32, Pos2, Stroke, Ui};
+use geo::{CoordsIter, Point, Polygon};
 use topola::geometry::shape::Shape;
 
 pub struct Painter<'a> {
-    ui: &'a mut egui::Ui,
+    ui: &'a mut Ui,
     transform: RectTransform,
 }
 
@@ -27,7 +27,7 @@ impl<'a> Painter<'a> {
                     self.transform
                         .transform_pos([seg.to.x() as f32, -seg.to.y() as f32].into()),
                 ],
-                egui::Stroke::new(seg.width as f32 * self.transform.scale().x, color),
+                Stroke::new(seg.width as f32 * self.transform.scale().x, color),
             ),
             Shape::Bend(bend) => {
                 let delta_from = bend.from - bend.c.pos;
@@ -47,7 +47,7 @@ impl<'a> Painter<'a> {
 
                 epaint::Shape::line(
                     points,
-                    egui::Stroke::new(bend.width as f32 * self.transform.scale().x, color),
+                    Stroke::new(bend.width as f32 * self.transform.scale().x, color),
                 )
             }
         };
@@ -55,6 +55,20 @@ impl<'a> Painter<'a> {
         self.ui.painter().add(epaint_shape);
     }
 
+    pub fn paint_polygon(&mut self, polygon: &Polygon, color: Color32) {
+        self.ui.painter().add(epaint::Shape::convex_polygon(
+            polygon
+                .exterior_coords_iter()
+                .map(|coords| {
+                    self.transform
+                        .transform_pos([coords.x as f32, -coords.y as f32].into())
+                })
+                .collect(),
+            color,
+            Stroke::default(),
+        ));
+    }
+
     pub fn paint_edge(&mut self, from: Point, to: Point, color: Color32) {
         //
     }