function extracted

examples/osm.rs

@@ -1,4 +1,4 @@
-use egui::{Align2, Context, Painter, RichText, Shape, Ui, Window};
+use egui::{Align2, Context, Painter, RichText, Shape, Ui, Vec2, Window};
 use walkers::{Center, Map, MapMemory, Position, PositionExt, Tiles};
 
 fn main() -> Result<(), eframe::Error> {
@@ -67,11 +67,13 @@ fn dworcowa_bus_stop() -> Position {
  Position::new(17.03940, 51.10005)
 }
 
-/// Shows how to draw various things in the map.
-fn draw_custom_shapes(ui: &Ui, painter: Painter, map_memory: &MapMemory, my_position: Position) {
- // Geographical position of the point we want to put our shapes.
- let position = dworcowa_bus_stop();
-
+/// Turn geographical position into location on the screen.
+fn screen_position(
+ position: Position,
+ painter: &Painter,
+ map_memory: &MapMemory,
+ my_position: Position,
+) -> Vec2 {
  // Turn that into a flat, mercator projection.
  let projected_position = position.project(map_memory.zoom.round());
 
@@ -82,8 +84,14 @@ fn draw_custom_shapes(ui: &Ui, painter: Painter, map_memory: &MapMemory, my_posi
  .project(map_memory.zoom.round());
 
  // From the two points above we can calculate the actual point on the screen.
- let screen_position =
- painter.clip_rect().center() + projected_position.to_vec2() - map_center_projected_position;
+ painter.clip_rect().center() + projected_position.to_vec2() - map_center_projected_position
+}
+
+/// Shows how to draw various things in the map.
+fn draw_custom_shapes(ui: &Ui, painter: Painter, map_memory: &MapMemory, my_position: Position) {
+ // Position of the point we want to put our shapes.
+ let position = dworcowa_bus_stop();
+ let screen_position = screen_position(position, &painter, map_memory, my_position);
 
  // Now we can just use Painter to draw stuff.
  let background = |text: &Shape| {