start a really basic OSD

editor/src/common/mod.rs

@@ -7,7 +7,9 @@ use crate::helpers::ID;
 use crate::render::DrawOptions;
 use crate::ui::UI;
 use abstutil::elapsed_seconds;
-use ezgui::{EventCtx, EventLoopMode, GfxCtx, Key};
+use ezgui::{
+    Color, EventCtx, EventLoopMode, GfxCtx, HorizontalAlignment, Key, Text, VerticalAlignment,
+};
 use geom::{Line, Pt2D};
 use std::time::Instant;
 
@@ -71,6 +73,34 @@ impl CommonState {
             navigate.draw(g);
         }
         self.turn_cycler.draw(g, ui);
+
+        let id_color = ui.cs.get_def("OSD ID color", Color::RED);
+        let name_color = ui.cs.get_def("OSD name color", Color::CYAN);
+        let mut osd = Text::new();
+        match ui.primary.current_selection {
+            None => {
+                osd.append("...".to_string(), None);
+            }
+            Some(ID::Lane(l)) => {
+                osd.append(format!("{}", l), Some(id_color));
+                osd.append(" is ".to_string(), None);
+                osd.append(ui.primary.map.get_parent(l).get_name(), Some(name_color));
+            }
+            Some(ID::Building(b)) => {
+                osd.append(format!("{}", b), Some(id_color));
+                osd.append(" is ".to_string(), None);
+                osd.append(ui.primary.map.get_b(b).get_name(), Some(name_color));
+            }
+            // TODO Intersections, cars, pedestrians...
+            Some(id) => {
+                osd.append(format!("{:?}", id), Some(id_color));
+            }
+        }
+        // TODO Grab hotkeys from the context menu
+        g.draw_blocking_text(
+            &osd,
+            (HorizontalAlignment::FillScreen, VerticalAlignment::Bottom),
+        );
     }
 
     pub fn draw_options(&self, ui: &UI) -> DrawOptions {

ezgui/src/canvas.rs

@@ -188,6 +188,7 @@ pub enum HorizontalAlignment {
     Left,
     Center,
     Right,
+    FillScreen,
 }
 
 pub enum VerticalAlignment {

ezgui/src/drawing.rs

@@ -153,11 +153,15 @@ impl<'a> GfxCtx<'a> {
         if txt.is_empty() {
             return;
         }
-        let (width, height) = self.text_dims(&txt);
+        let (mut width, height) = self.text_dims(&txt);
         let x1 = match horiz {
             HorizontalAlignment::Left => 0.0,
             HorizontalAlignment::Center => (self.canvas.window_width - width) / 2.0,
             HorizontalAlignment::Right => self.canvas.window_width - width,
+            HorizontalAlignment::FillScreen => {
+                width = self.canvas.window_width;
+                0.0
+            }
         };
         let y1 = match vert {
             VerticalAlignment::Top => 0.0,

map_model/src/building.rs

@@ -50,4 +50,18 @@ impl Building {
     pub fn sidewalk(&self) -> LaneID {
         self.front_path.sidewalk.lane()
     }
+
+    pub fn get_name(&self) -> String {
+        self.osm_tags
+            .get("name")
+            .map(|s| s.to_string())
+            .or_else(|| {
+                self.osm_tags.get("addr:housenumber").and_then(|num| {
+                    self.osm_tags
+                        .get("addr:street")
+                        .map(|street| format!("{} {}", num, street))
+                })
+            })
+            .unwrap_or("???".to_string())
+    }
 }