bugfix: Fix zoom on mobile (galileo-map#273)

This commit adds passing through the touch events to the event_processor
which allows pinch zoom to work on touch devices.

Author: DeepHorizons

galileo-egui/src/egui_map.rs

@@ -8,7 +8,7 @@ use egui::{Event, Image, ImageSource, Sense, TextureId, Ui, Vec2};
 use egui_wgpu::wgpu::{FilterMode, TextureView};
 use egui_wgpu::RenderState;
 use galileo::control::{
-    EventProcessor, MapController, MouseButton, RawUserEvent, UserEventHandler,
+    EventProcessor, MapController, MouseButton, RawUserEvent, TouchEvent, UserEventHandler,
 };
 use galileo::galileo_types::cartesian::{Point2, Size};
 use galileo::galileo_types::geo::impls::GeoPoint2d;
@@ -434,6 +434,24 @@ impl<'a> EguiMapState {
 
                 Some(RawUserEvent::Scroll(zoom))
             }
+            Event::Touch {
+                device_id: _,
+                id,
+                phase,
+                pos,
+                force: _,
+            } => {
+                let event = TouchEvent {
+                    touch_id: id.0,
+                    position: Point2::new(pos.x as f64, pos.y as f64),
+                };
+                match phase {
+                    egui::TouchPhase::Start => Some(RawUserEvent::TouchStart(event)),
+                    egui::TouchPhase::Move => Some(RawUserEvent::TouchMove(event)),
+                    egui::TouchPhase::End => Some(RawUserEvent::TouchEnd(event)),
+                    egui::TouchPhase::Cancel => Some(RawUserEvent::TouchEnd(event)),
+                }
+            }
 
             _ => None,
         }