From d3ae44a367de28934f64155be7b4f04bd63db1dc Mon Sep 17 00:00:00 2001
From: Tom Barrett <tom@tombarrett.xyz>
Date: Sun, 21 Mar 2021 15:43:13 +0100
Subject: can now move gems

---
 src/main.rs | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 4 deletions(-)

(limited to 'src/main.rs')

diff --git a/src/main.rs b/src/main.rs
index bb65f81..d9a468f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -52,6 +52,8 @@ struct Cell {
     x: usize,
     y: usize,
     occupant: Occupant,
+    selected: bool,
+    hovered: bool,
 }
 
 impl Cell {
@@ -60,6 +62,8 @@ impl Cell {
             x,
             y,
             occupant: Occupant::None,
+            selected: false,
+            hovered: false,
         }
     }
 }
@@ -283,7 +287,8 @@ pub fn setup(
 
 fn mouse_system(
     windows: Res<Windows>,
-    mut cell_query: Query<(&Cell, &mut Transform, &mut TextureAtlasSprite)>,
+    mut cell_query: Query<(&mut Cell, &mut Transform, &mut TextureAtlasSprite)>,
+    mouse_button_input: Res<Input<MouseButton>>,
 ) {
     if let Some(mut cursor_position) = windows
         .get_primary()
@@ -292,17 +297,61 @@ fn mouse_system(
         cursor_position.x -= 400.0 - 16.0 * 3.5 * 0.5;
         cursor_position.y -= 300.0 - 16.0 * 3.5 * 0.5;
 
-        for (_, _, mut sprite) in cell_query.iter_mut() {
-            sprite.color.set_a(1.0);
+        for (cell, _, mut sprite) in cell_query.iter_mut() {
+            if cell.selected {
+                sprite.color.set_a(0.2);
+            } else if cell.hovered {
+                sprite.color.set_a(0.5);
+            } else {
+                sprite.color.set_a(1.0);
+            }
         }
 
-        for (_, transform, mut sprite) in cell_query.iter_mut() {
+        for (mut cell, transform, mut sprite) in cell_query.iter_mut() {
             if transform.translation.x < cursor_position.x
                 && transform.translation.x + 16.0 * 3.5 > cursor_position.x
                 && transform.translation.y < cursor_position.y
                 && transform.translation.y + 16.0 * 3.5 > cursor_position.y
             {
+                cell.hovered = true;
                 sprite.color.set_a(0.5);
+                if mouse_button_input.just_pressed(MouseButton::Left) {
+                    cell.selected = true;
+                }
+            } else {
+                cell.hovered = false;
+            }
+        }
+
+        if mouse_button_input.just_released(MouseButton::Left) {
+            let mut cells: Vec<Cell> = Vec::new();
+            for (cell, _, _) in cell_query.iter_mut() {
+                cells.push(*cell);
+            }
+            if let Some(mut selected) = cells.clone().iter_mut().find(|c| c.selected) {
+                if let Some(mut hovered) = cells.iter_mut().find(|c| c.hovered) {
+                    if (selected.x == hovered.x + 1 && selected.y == hovered.y)
+                        || (selected.x == hovered.x - 1 && selected.y == hovered.y)
+                        || (selected.y == hovered.y + 1 && selected.x == hovered.x)
+                        || (selected.y == hovered.y - 1 && selected.x == hovered.x)
+                    {
+                        let tmp = selected.occupant;
+                        selected.occupant = hovered.occupant;
+                        hovered.occupant = tmp;
+                        for (mut cell, _, mut sprite) in cell_query.iter_mut() {
+                            if cell.x == selected.x && cell.y == selected.y {
+                                cell.occupant = selected.occupant;
+                                sprite.index = cell.occupant.to_index();
+                            } else if cell.x == hovered.x && cell.y == hovered.y {
+                                cell.occupant = hovered.occupant;
+                                sprite.index = cell.occupant.to_index();
+                            }
+                        }
+                    }
+                }
+            }
+            for (mut cell, _, _) in cell_query.iter_mut() {
+                cell.selected = false;
             }
         }
     }
-- 
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