clean imports

src/main.rs

-use std::cmp;
-use std::collections::HashMap;
 use std::env;
 use std::path;
 
-use ggez;
-use ggez::{event, input};
-use ggez::{Context, GameResult};
-use ggez::event::{KeyCode, MouseButton};
-use ggez::graphics;
-use ggez::graphics::{Color, DrawMode, FillOptions, MeshBuilder, StrokeOptions};
-use ggez::timer::check_update_time;
-use glam::Vec2;
-
-use behavior::ItemBehavior;
-use physics::{MetaEvent, PhysicEvent, util};
-use scene::item::{ItemState, SceneItem, SceneItemSpriteInfo, SceneItemType};
 use scene::main::MainState;
-use scene::SpriteType;
-use ui::{SceneItemPrepareOrder, UiItem, UiSpriteInfo, UserEvent};
-use ui::scene_item_menu::SceneItemMenuItem;
 
-use crate::physics::position::GridPosition;
+use ggez::{event, GameResult};
+use glam::Vec2;
 
+mod behavior;
 mod physics;
-mod ui;
 mod scene;
-mod behavior;
+mod ui;
 
 // TODO: create a ScenePosition and a WindowPosition to be more explicit
 type Point2 = Vec2;

src/scene/item.rs

 use ggez::graphics;
 
-use crate::{Point2, SCENE_ITEMS_SPRITE_SHEET_HEIGHT, SCENE_ITEMS_SPRITE_SHEET_WIDTH};
 use crate::behavior::ItemBehavior;
-use crate::physics::{MetaEvent, util};
 use crate::physics::position::GridPosition;
+use crate::physics::{util, MetaEvent};
 use crate::scene::SpriteType;
+use crate::{Point2, SCENE_ITEMS_SPRITE_SHEET_HEIGHT, SCENE_ITEMS_SPRITE_SHEET_WIDTH};
 
 pub struct SceneItemSpriteInfo {
     pub relative_start_y: f32,

src/scene/main.rs

 use std::cmp;
 use std::collections::HashMap;
 
-use ggez::{Context, event, GameResult, graphics, input};
 use ggez::event::MouseButton;
 use ggez::graphics::{DrawMode, MeshBuilder, StrokeOptions};
 use ggez::timer::check_update_time;
+use ggez::{event, graphics, input, Context, GameResult};
 
-use crate::{ANIMATE_EACH, DEFAULT_SELECTED_SQUARE_SIDE, DEFAULT_SELECTED_SQUARE_SIDE_HALF, DISPLAY_OFFSET_BY, DISPLAY_OFFSET_BY_SPEED, MAX_FRAME_I, META_EACH, PHYSICS_EACH, Point2, SCENE_ITEMS_CHANGE_ERR_MSG, SPRITE_EACH, TARGET_FPS};
 use crate::behavior::ItemBehavior;
-use crate::physics::{MetaEvent, PhysicEvent, util};
 use crate::physics::position::GridPosition;
+use crate::physics::{util, MetaEvent, PhysicEvent};
 use crate::scene::item::{ItemState, SceneItem, SceneItemType};
-use crate::ui::{SceneItemPrepareOrder, UiItem, UiSpriteInfo, UserEvent};
 use crate::ui::scene_item_menu::SceneItemMenuItem;
+use crate::ui::{SceneItemPrepareOrder, UiItem, UiSpriteInfo, UserEvent};
+use crate::{
+    Point2, ANIMATE_EACH, DEFAULT_SELECTED_SQUARE_SIDE, DEFAULT_SELECTED_SQUARE_SIDE_HALF,
+    DISPLAY_OFFSET_BY, DISPLAY_OFFSET_BY_SPEED, MAX_FRAME_I, META_EACH, PHYSICS_EACH,
+    SCENE_ITEMS_CHANGE_ERR_MSG, SPRITE_EACH, TARGET_FPS,
+};
 use ggez::input::keyboard::KeyCode;
 
 pub struct MainState {

src/ui/mod.rs

 use ggez::graphics;
 
-use crate::{Point2, UI_SPRITE_SHEET_HEIGHT, UI_SPRITE_SHEET_WIDTH};
 use crate::scene::item::SceneItem;
 use crate::ui::scene_item_menu::SceneItemMenuItem;
+use crate::{Point2, UI_SPRITE_SHEET_HEIGHT, UI_SPRITE_SHEET_WIDTH};
 
 pub mod scene_item_menu;