gui, inventory, symmetrical shadowcasting, bugfixes

src/gui.rs

@@ -1,5 +1,5 @@
-use super::{CombatStats, GameLog, Map, Name, Player, Point, Position};
-use rltk::{Rltk, RGB};
+use super::{gamelog::GameLog, CombatStats, InBackpack, Map, Name, Player, Point, Position, State};
+use rltk::{Rltk, VirtualKeyCode, RGB};
 use specs::prelude::*;
 
 pub fn draw_ui(ecs: &World, ctx: &mut Rltk) {
@@ -110,3 +110,52 @@ fn draw_tooltips(ecs: &World, ctx: &mut Rltk) {
         }
     }
 }
+
+#[derive(PartialEq, Copy, Clone)]
+pub enum ItemMenuResult {
+    Cancel,
+    NoResponse,
+    Selected,
+}
+
+pub fn show_inventory(gs: &mut State, ctx: &mut Rltk) -> (ItemMenuResult, Option<Entity>) {
+    let player_entity = gs.ecs.fetch::<Entity>();
+    let names = gs.ecs.read_storage::<Name>();
+    let backpack = gs.ecs.read_storage::<InBackpack>();
+    let entities = gs.ecs.entities();
+
+    let inventory = (&backpack, &names).join().filter(|item| item.0.owner == *player_entity);
+    let count = inventory.count();
+
+    let mut y = (25 - (count / 2)) as i32;
+    ctx.draw_box(15, y - 2, 31, (count + 3) as i32, RGB::named(rltk::WHITE), RGB::named(rltk::BLACK));
+    ctx.print_color(18, y - 2, RGB::named(rltk::YELLOW), RGB::named(rltk::BLACK), "Inventory");
+    ctx.print_color(18, y + count as i32 + 1, RGB::named(rltk::YELLOW), RGB::named(rltk::BLACK), "ESC to cancel");
+
+    let mut equippable: Vec<Entity> = Vec::new();
+    let mut j = 0;
+    for (entity, _pack, name) in (&entities, &backpack, &names).join().filter(|item| item.1.owner == *player_entity) {
+        ctx.set(17, y, RGB::named(rltk::WHITE), RGB::named(rltk::BLACK), rltk::to_cp437('('));
+        ctx.set(18, y, RGB::named(rltk::YELLOW), RGB::named(rltk::BLACK), 97 + j as rltk::FontCharType);
+        ctx.set(19, y, RGB::named(rltk::WHITE), RGB::named(rltk::BLACK), rltk::to_cp437(')'));
+
+        ctx.print(21, y, &name.name.to_string());
+        equippable.push(entity);
+        y += 1;
+        j += 1;
+    }
+
+    match ctx.key {
+        None => (ItemMenuResult::NoResponse, None),
+        Some(key) => match key {
+            VirtualKeyCode::Escape => (ItemMenuResult::Cancel, None),
+            _ => {
+                let selection = rltk::letter_to_option(key);
+                if selection > -1 && selection < count as i32 {
+                    return (ItemMenuResult::Selected, Some(equippable[selection as usize]));
+                }
+                (ItemMenuResult::NoResponse, None)
+            }
+        },
+    }
+}