From a18fcb44ac116430ef399601d9233876790151bb Mon Sep 17 00:00:00 2001
From: Szymon Nowakowski <renati@renati.me>
Date: Tue, 22 Sep 2026 02:24:59 +0200
Subject: [PATCH] Signed coord display in HUD

---
 src/Player.zig | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/Player.zig b/src/Player.zig
index 8180925..df4e2ff 100644
--- a/src/Player.zig
+++ b/src/Player.zig
@@ -421,30 +421,35 @@ pub fn update(self: *Player, dt: f32, game: *Game) void {
         const margin: f16 = 8;
         const font_size: f32 = 16;
 
+        // NOTE We have to do the number formatting semi-manually, because zig's
+        // std fmt is weird with signed numbers
+
+        var number_buf: [9]u8 = undefined; // sign ('-' or ' ') and 8 hex digits
+
         gui.pushBox(.{
             .background_color = .init(0, 0, 0, 0.75),
             .border_color = .init(0, 0, 0, 1),
             .position_sspx = .init(0, 0),
-            .size_px = .init(157, 4 * margin + 3 * font_size),
+            .size_px = .init(164, 4 * margin + 3 * font_size),
             .border_width_px = 0,
             .border_radius_px = 0,
         });
 
-        gui.printLine("X {X:0>8}", .{@as(u32, @bitCast(self.position_sv.x))}, .{
+        gui.printLine("X {s}", .{formatHexCoord(self.position_sv.x, &number_buf)}, .{
             .position_sspx = .init(margin, margin + font_size),
             .font_id = @enumFromInt(0),
             .cap_height_px = font_size,
             .color = .init(1, 1, 1, 1),
         });
 
-        gui.printLine("Y {X:0>8}", .{@as(u32, @bitCast(self.position_sv.y))}, .{
+        gui.printLine("Y {s}", .{formatHexCoord(self.position_sv.y, &number_buf)}, .{
             .position_sspx = .init(margin, 2 * (margin + font_size)),
             .font_id = @enumFromInt(0),
             .cap_height_px = font_size,
             .color = .init(1, 1, 1, 1),
         });
 
-        gui.printLine("Z {X:0>8}", .{@as(u32, @bitCast(self.position_sv.z))}, .{
+        gui.printLine("Z {s}", .{formatHexCoord(self.position_sv.z, &number_buf)}, .{
             .position_sspx = .init(margin, 3 * (margin + font_size)),
             .font_id = @enumFromInt(0),
             .cap_height_px = font_size,
@@ -508,6 +513,19 @@ pub fn update(self: *Player, dt: f32, game: *Game) void {
     }
 }
 
+fn formatHexCoord(coord: i32, buf: *[9]u8) []const u8 {
+    buf[0] = ' ';
+    const coord_abs = @abs(coord);
+    _ = std.fmt.bufPrint(buf[1..9], "{X:>8}", .{coord_abs}) catch unreachable;
+
+    if (coord < 0) {
+        const i = std.mem.findScalarLast(u8, buf, ' ') orelse unreachable;
+        buf[i] = '-';
+    }
+
+    return buf[0..];
+}
+
 fn resetAllButtons(self: *Player) void {
     inline for (@typeInfo(Player).@"struct".fields) |field| {
         if (field.type == Button) {