feat: move scene when cursor in border

battle_gui/src/engine/input.rs

@@ -9,6 +9,7 @@ use ggez::{event::MouseButton, input::keyboard::KeyInput, winit::event::VirtualK
 use crate::{
     debug::DebugPhysics,
     engine::{event::UIEvent, message::GuiStateMessage},
+    ui::BORDER_MOVE_FACTOR,
 };
 use serde::{Deserialize, Serialize};
 
@@ -59,6 +60,20 @@ impl Engine {
             UIEvent::ImmobileCursorSince(cursor_immobile_since),
         )));
 
+        if !self.gui_state.pending_order().is_empty() || self.gui_state.dragged_squad().is_some() {
+            if let Some(border) =
+                self.point_in_border(ctx, self.gui_state.current_cursor_window_point())
+            {
+                let (x, y) = border.modifier();
+                messages.push(EngineMessage::GuiState(
+                    GuiStateMessage::ApplyOnDisplaySceneOffset(Offset::new(
+                        -x as f32 * BORDER_MOVE_FACTOR,
+                        -y as f32 * BORDER_MOVE_FACTOR,
+                    )),
+                ));
+            }
+        }
+
         messages
     }
 

battle_gui/src/engine/ui.rs

@@ -15,14 +15,15 @@ use battle_core::{
     game::{cover::CoverFinder, health::SoldierHealthBuilder},
     graphics::vehicle::VehicleGraphicInfos,
     order::{Order, PendingOrder},
+    physics::path::Direction,
     state::battle::message::{BattleStateMessage, SoldierMessage, VehicleMessage},
     types::*,
     utils::DebugPoint,
 };
 
 use crate::{
     engine::event::UIEvent,
-    ui::{color::Colorized, menu::squad_menu_sprite_info},
+    ui::{color::Colorized, hud::HUD_HEIGHT, menu::squad_menu_sprite_info, BORDER_SIZE},
     utils::GREEN,
 };
 
@@ -579,4 +580,37 @@ impl Engine {
 
         messages
     }
+
+    pub fn point_in_border(&self, ctx: &Context, point: &WindowPoint) -> Option<Direction> {
+        let (width, height) = ctx.gfx.drawable_size();
+        let height = height - HUD_HEIGHT;
+
+        if point.x <= BORDER_SIZE && point.y <= BORDER_SIZE {
+            return Some(Direction::NorthWest);
+        }
+        if point.x >= width - BORDER_SIZE && point.y <= BORDER_SIZE {
+            return Some(Direction::NorthEst);
+        }
+        if point.x >= width - BORDER_SIZE && point.y >= height - BORDER_SIZE {
+            return Some(Direction::SouthEst);
+        }
+        if point.x <= BORDER_SIZE && point.y >= height - BORDER_SIZE {
+            return Some(Direction::SouthWest);
+        }
+
+        if point.y <= BORDER_SIZE {
+            return Some(Direction::North);
+        }
+        if point.y >= height - BORDER_SIZE {
+            return Some(Direction::South);
+        }
+        if point.x <= BORDER_SIZE {
+            return Some(Direction::West);
+        }
+        if point.x >= width - BORDER_SIZE {
+            return Some(Direction::Est);
+        }
+
+        None
+    }
 }

battle_gui/src/ui/mod.rs

@@ -4,3 +4,6 @@ pub mod component;
 pub mod health;
 pub mod hud;
 pub mod menu;
+
+pub const BORDER_SIZE: f32 = 30.;
+pub const BORDER_MOVE_FACTOR: f32 = 3.;