From 04855478fde13c781948a61bd902e0a5ca738285 Mon Sep 17 00:00:00 2001
From: Abdelrahman <said.abdelrahman89@gmail.com>
Date: Wed, 24 Jan 2024 22:43:55 +0000
Subject: [PATCH] Add function to calculate line direction

---
 include/window.h | 2 ++
 src/window.c     | 7 +++++++
 2 files changed, 9 insertions(+)

diff --git a/include/window.h b/include/window.h
index fb4cca5..4af3933 100644
--- a/include/window.h
+++ b/include/window.h
@@ -69,6 +69,8 @@ void cleanup_window(window *wnd);
 void clear_window(const window *wnd, colour colour);
 void swap_buffers(const window *wnd);
 
+vec2 line_direction(const line *ln);
+
 void draw_point(const window *wnd, point p, colour colour);
 void draw_line(const window *wnd, const line *ln, colour colour);
 void draw_triangle(const window *wnd, triangle triangle, colour colour);
diff --git a/src/window.c b/src/window.c
index f843ec7..e0da976 100644
--- a/src/window.c
+++ b/src/window.c
@@ -72,6 +72,13 @@ void clear_window(const window *wnd, colour colour) {
 
 void swap_buffers(const window *wnd) { SDL_RenderPresent(wnd->renderer); }
 
+vec2 line_direction(const line *ln) {
+  return (vec2){
+      .x = ln->p1.x - ln->p0.x,
+      .y = ln->p1.y - ln->p0.y,
+  };
+}
+
 void draw_point(const window *wnd, point p, colour colour) {
   set_colour(wnd, colour);
   SDL_RenderDrawPoint(wnd->renderer, p.x, p.y);