From da98b54216cceb8e7722bd6373e58d44f993b6c2 Mon Sep 17 00:00:00 2001
From: Xevion <xevion@xevion.dev>
Date: Sun, 10 Sep 2023 14:17:39 -0500
Subject: [PATCH] feat: wall collisions

---
 src/direction.rs |  9 +++++++++
 src/helper.rs    | 15 +++++++++++++++
 src/pacman.rs    | 16 +++++++++++++++-
 3 files changed, 39 insertions(+), 1 deletion(-)
 create mode 100644 src/helper.rs

diff --git a/src/direction.rs b/src/direction.rs
index 045cecc..1112510 100644
--- a/src/direction.rs
+++ b/src/direction.rs
@@ -15,4 +15,13 @@ impl Direction {
             Direction::Up => 270f64,
         }
     }
+
+    pub fn offset(&self) -> (i32, i32) {
+        match self {
+            Direction::Right => (1, 0),
+            Direction::Down => (0, 1),
+            Direction::Left => (-1, 0),
+            Direction::Up => (0, -1),
+        }
+    }
 }
\ No newline at end of file
diff --git a/src/helper.rs b/src/helper.rs
new file mode 100644
index 0000000..976867b
--- /dev/null
+++ b/src/helper.rs
@@ -0,0 +1,15 @@
+pub fn is_adjacent(a: (u32, u32), b: (u32, u32), diagonal: bool) -> bool {
+    let (ax, ay) = a;
+    let (bx, by) = b;
+    if diagonal {
+        (ax == bx && (ay == by + 1 || ay == by - 1))
+            || (ay == by && (ax == bx + 1 || ax == bx - 1))
+            || (ax == bx + 1 && ay == by + 1)
+            || (ax == bx + 1 && ay == by - 1)
+            || (ax == bx - 1 && ay == by + 1)
+            || (ax == bx - 1 && ay == by - 1)
+    } else {
+        (ax == bx && (ay == by + 1 || ay == by - 1))
+            || (ay == by && (ax == bx + 1 || ax == bx - 1))
+    }
+}
\ No newline at end of file
diff --git a/src/pacman.rs b/src/pacman.rs
index 879af6d..2cddfc5 100644
--- a/src/pacman.rs
+++ b/src/pacman.rs
@@ -4,6 +4,7 @@ use sdl2::{
 };
 
 use crate::{
+    constants::{BOARD, MapTile},
     animation::AnimatedTexture, constants::CELL_SIZE, direction::Direction, entity::Entity,
     modulation::SpeedModulator,
 };
@@ -13,6 +14,7 @@ pub struct Pacman<'a> {
     pub position: (i32, i32),
     pub direction: Direction,
     pub next_direction: Option<Direction>,
+    pub stopped: bool,
     speed: u32,
     modulation: SpeedModulator,
     sprite: AnimatedTexture<'a>,
@@ -25,6 +27,7 @@ impl Pacman<'_> {
             direction: Direction::Right,
             next_direction: None,
             speed: 2,
+            stopped: false,
             modulation: SpeedModulator::new(0.9333),
             sprite: AnimatedTexture::new(atlas, 4, 3, 32, 32, Some((-4, -4))),
         }
@@ -33,6 +36,12 @@ impl Pacman<'_> {
     pub fn render(&mut self, canvas: &mut Canvas<Window>) {
         self.sprite.render(canvas, self.position, self.direction);
     }
+
+    fn next_cell(&self) -> (i32, i32) {
+        let (x, y) = self.direction.offset();
+        let cell = self.cell_position();
+        (cell.0 as i32 + x, cell.1 as i32 + y)
+    }
 }
 
 impl Entity for Pacman<'_> {
@@ -65,7 +74,7 @@ impl Entity for Pacman<'_> {
             }
         }
 
-        if self.modulation.next() {
+        if !self.stopped && self.modulation.next() {
             let speed = self.speed as i32;
             match self.direction {
                 Direction::Right => {
@@ -82,5 +91,10 @@ impl Entity for Pacman<'_> {
                 }
             }
         }
+
+        let next = self.next_cell();
+        if BOARD[next.1 as usize][next.0 as usize] == MapTile::Wall {
+            self.stopped = true;
+        }
     }
 }