Reorganize zorder_range out of PerMap and into DrawMap.

game/src/app.rs

@@ -439,10 +439,8 @@ impl App {
         ctx.set_style(self.cs.gui_style.clone());
 
         ctx.loading_screen("rerendering map colors", |ctx, timer| {
-            let (draw_map, zorder_range) =
+            self.primary.draw_map =
                 DrawMap::new(&self.primary.map, &self.opts, &self.cs, ctx, timer);
-            self.primary.draw_map = draw_map;
-            self.primary.zorder_range = zorder_range;
         });
 
         true
@@ -530,7 +528,6 @@ pub struct PerMap {
     pub last_warped_from: Option<(Pt2D, f64)>,
     pub sim_cb: Option<Box<dyn SimCallback>>,
     pub show_zorder: isize,
-    pub zorder_range: (isize, isize),
     /// If we ever left edit mode and resumed without restarting from midnight, this is true.
     pub dirty_from_edits: bool,
     /// Any ScenarioModifiers in effect?
@@ -566,19 +563,18 @@ impl PerMap {
         timer: &mut Timer,
     ) -> PerMap {
         timer.start("draw_map");
-        let (draw_map, zorder_range) = DrawMap::new(&map, opts, cs, ctx, timer);
+        let draw_map = DrawMap::new(&map, opts, cs, ctx, timer);
         timer.stop("draw_map");
 
         let per_map = PerMap {
             map,
+            show_zorder: draw_map.zorder_range.1,
             draw_map,
             sim,
             current_selection: None,
             current_flags: flags,
             last_warped_from: None,
             sim_cb: None,
-            zorder_range,
-            show_zorder: zorder_range.1,
             dirty_from_edits: false,
             has_modified_trips: false,
             unedited_map: RefCell::new(None),

game/src/common/minimap.rs

@@ -111,8 +111,12 @@ impl Minimap {
                 if app.opts.dev || !self.extra_controls {
                     Widget::col(vec![
                         Line("Z-order:").small().draw(ctx),
-                        Spinner::new(ctx, app.primary.zorder_range, app.primary.show_zorder)
-                            .named("zorder"),
+                        Spinner::new(
+                            ctx,
+                            app.primary.draw_map.zorder_range,
+                            app.primary.show_zorder,
+                        )
+                        .named("zorder"),
                     ])
                     .margin_above(10)
                 } else {

game/src/render/map.rs

@@ -46,23 +46,28 @@ pub struct DrawMap {
     pub draw_all_unzoomed_parking_lots: Drawable,
     pub draw_all_areas: Drawable,
 
+    pub zorder_range: (isize, isize),
+
     quadtree: QuadTree<ID>,
 }
 
 impl DrawMap {
-    /// Returns the DrawMap and also the zorder_range (low, high)
     pub fn new(
         map: &Map,
         opts: &Options,
         cs: &ColorScheme,
         ctx: &EventCtx,
         timer: &mut Timer,
-    ) -> (DrawMap, (isize, isize)) {
+    ) -> DrawMap {
         let mut roads: Vec<DrawRoad> = Vec::new();
+        let mut low_z = 0;
+        let mut high_z = 0;
         timer.start_iter("make DrawRoads", map.all_roads().len());
         for r in map.all_roads() {
             timer.next();
             roads.push(DrawRoad::new(r));
+            low_z = low_z.min(r.zorder);
+            high_z = high_z.max(r.zorder);
         }
 
         let mut lanes: Vec<DrawLane> = Vec::new();
@@ -172,7 +177,7 @@ impl DrawMap {
             abstutil::prettyprint_usize(ctx.prerender.get_total_bytes_uploaded() / 1024 / 1024)
         ));
 
-        let draw_map = DrawMap {
+        DrawMap {
             roads,
             lanes,
             intersections,
@@ -195,16 +200,9 @@ impl DrawMap {
             }),
 
             quadtree,
-        };
 
-        let mut low_z = 0;
-        let mut high_z = 0;
-        for r in map.all_roads() {
-            low_z = low_z.min(r.zorder);
-            high_z = high_z.max(r.zorder);
+            zorder_range: (low_z, high_z),
         }
-
-        (draw_map, (low_z, high_z))
     }
 
     pub fn regenerate_unzoomed_layer(