From 5bd85f5d867f64d89615e56b3d257a2bece89a26 Mon Sep 17 00:00:00 2001
From: Timothy Warren <twarren@nabancard.com>
Date: Wed, 17 Nov 2021 13:50:55 -0500
Subject: [PATCH] Add particle effects for item usage

---
 src/inventory_system.rs | 49 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/src/inventory_system.rs b/src/inventory_system.rs
index cc7b319..bb6bab8 100644
--- a/src/inventory_system.rs
+++ b/src/inventory_system.rs
@@ -1,5 +1,7 @@
 use crate::components::*;
+use crate::particle_system::ParticleBuilder;
 use crate::{game_log::GameLog, Map};
+use rltk::RGB;
 use specs::prelude::*;
 
 pub struct ItemCollectionSystem {}
@@ -63,6 +65,8 @@ impl<'a> System<'a> for ItemUseSystem {
         ReadStorage<'a, Equippable>,
         WriteStorage<'a, Equipped>,
         WriteStorage<'a, InBackpack>,
+        WriteExpect<'a, ParticleBuilder>,
+        ReadStorage<'a, Position>,
     );
 
     #[allow(clippy::cognitive_complexity)]
@@ -84,6 +88,8 @@ impl<'a> System<'a> for ItemUseSystem {
             equippable,
             mut equipped,
             mut backpack,
+            mut particle_builder,
+            positions,
         ) = data;
 
         for (entity, useitem) in (&entities, &wants_use).join() {
@@ -117,6 +123,15 @@ impl<'a> System<'a> for ItemUseSystem {
                                 for mob in map.tile_content[idx].iter() {
                                     targets.push(*mob);
                                 }
+
+                                particle_builder.request(
+                                    tile_idx.x,
+                                    tile_idx.y,
+                                    RGB::named(rltk::ORANGE),
+                                    RGB::named(rltk::BLACK),
+                                    rltk::to_cp437('░'),
+                                    200.0,
+                                );
                             }
                         }
                     }
@@ -189,6 +204,18 @@ impl<'a> System<'a> for ItemUseSystem {
                             }
 
                             used_item = true;
+
+                            // Visually show healing
+                            if let Some(pos) = positions.get(*target) {
+                                particle_builder.request(
+                                    pos.x,
+                                    pos.y,
+                                    RGB::named(rltk::GREEN),
+                                    RGB::named(rltk::BLACK),
+                                    rltk::to_cp437('♥'),
+                                    200.0,
+                                );
+                            }
                         }
                     }
                 }
@@ -210,6 +237,17 @@ impl<'a> System<'a> for ItemUseSystem {
                                 "You use {} on {}, inflicting {} hp.",
                                 item_name.name, mob_name.name, damage.damage
                             ));
+
+                            if let Some(pos) = positions.get(*mob) {
+                                particle_builder.request(
+                                    pos.x,
+                                    pos.y,
+                                    RGB::named(rltk::RED),
+                                    RGB::named(rltk::BLACK),
+                                    rltk::to_cp437('‼'),
+                                    200.0,
+                                );
+                            }
                         }
 
                         used_item = true;
@@ -236,6 +274,17 @@ impl<'a> System<'a> for ItemUseSystem {
                                     "You use {} on {}, confusing them.",
                                     item_name.name, mob_name.name
                                 ));
+
+                                if let Some(pos) = positions.get(*mob) {
+                                    particle_builder.request(
+                                        pos.x,
+                                        pos.y,
+                                        RGB::named(rltk::MAGENTA),
+                                        RGB::named(rltk::BLACK),
+                                        rltk::to_cp437('?'),
+                                        200.0,
+                                    );
+                                }
                             }
                         }
                     }