From f4aa1bc01c15d607facc224cc98c3e291af26c5b Mon Sep 17 00:00:00 2001
From: Camden Dixie O'Brien <cdo@wip.sh>
Date: Mon, 4 Nov 2024 00:01:32 +0000
Subject: [PATCH] Draw visited cells in a different colour

---
 main.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/main.c b/main.c
index e2b46fe..39dd10c 100644
--- a/main.c
+++ b/main.c
@@ -51,9 +51,12 @@ static Display *dpy;
 static Window window;
 static GC ctx;
 static cell_t maze[GRID_SIZE][GRID_SIZE];
+static int bg_col, wall_col, visited_col;
 
 static void draw_walls(void)
 {
+	XSetForeground(dpy, ctx, wall_col);
+
 	XFillRectangle(
 	    dpy, window, ctx, PX(MARGIN), PX(MARGIN), PX(GRID_SIZE + 2),
 	    PX(WALL_THICKNESS));
@@ -80,7 +83,11 @@ static void draw_maze(void)
 
 	for (int x = 0; x < GRID_SIZE; ++x) {
 		for (int y = 0; y < GRID_SIZE; ++y) {
-			if (maze[x][y].is_path)
+			if (!maze[x][y].is_path)
+				XSetForeground(dpy, ctx, wall_col);
+			else if (maze[x][y].visited)
+				XSetForeground(dpy, ctx, visited_col);
+			else
 				continue;
 			const int left = margin_px + PX(x);
 			const int top = margin_px + PX(y);
@@ -149,15 +156,21 @@ int main(void)
 	assert(dpy);
 
 	// Create window and configure graphics context
-	const int black = BlackPixel(dpy, DefaultScreen(dpy));
-	const int white = WhitePixel(dpy, DefaultScreen(dpy));
+	wall_col = BlackPixel(dpy, DefaultScreen(dpy));
+	bg_col = WhitePixel(dpy, DefaultScreen(dpy));
 	window = XCreateSimpleWindow(
 	    dpy, DefaultRootWindow(dpy), 0, 0, PX(WINDOW_SIZE), PX(WINDOW_SIZE),
-	    0, white, white);
+	    0, bg_col, bg_col);
 	Atom del = XInternAtom(dpy, "WM_DELETE_WINDOW", false);
 	XSetWMProtocols(dpy, window, &del, 1);
 	ctx = DefaultGC(dpy, DefaultScreen(dpy));
-	XSetForeground(dpy, ctx, black);
+
+	// Create colormap and allocate colour for visited cells
+	Colormap cm = XCreateColormap(
+	    dpy, window, DefaultVisual(dpy, DefaultScreen(dpy)), AllocNone);
+	XColor xcol = { .red = 55555, .green = 10000, .blue = 10000 };
+	XAllocColor(dpy, cm, &xcol);
+	visited_col = xcol.pixel;
 
 	// Map window
 	XSelectInput(dpy, window, StructureNotifyMask);