From 05ba88359e54178f46df5529443be5cd4b264933 Mon Sep 17 00:00:00 2001
From: Richard Zink <Richard Zink>
Date: Tue, 3 Nov 2026 08:58:35 +0100
Subject: [PATCH] Planned hero entry points: walls glow and pulse red, with a
 pulsing red light

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 DESIGN.md       |  2 +-
 src/render3d.rs | 32 ++++++++++++++++++++++++++++++++
 src/save.rs     | 20 ++++++++++++++++++++
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/DESIGN.md b/DESIGN.md
index bc80721..ede93ed 100644
--- a/DESIGN.md
+++ b/DESIGN.md
@@ -82,7 +82,7 @@ An original dungeon management game (genre: dungeon building & defence) that run
 - Each wave picks an **entry point** on the border of the realm facing the hero gate: few towers/creatures, no reinforced walls and a short way are attractive, entry points of recent waves are avoided, plus some randomness
 - Waves of **6+ heroes split into two groups** with different entry points (the paladin goes with the bigger group)
 - Heroes first tunnel to their entry point, then go for the core
-- **Warning** 30 s before: scout message with the direction(s) and blinking markers on the minimap
+- **Warning** 30 s before: scout message with the direction(s), blinking markers on the minimap and the **walls at the entry points glowing and pulsing red** (plus a pulsing red light) until the wave has broken in
 
 ## Goal
 - **Victory**: destroy the Hero Gate
diff --git a/src/render3d.rs b/src/render3d.rs
index 200c6f4..4d617c3 100644
--- a/src/render3d.rs
+++ b/src/render3d.rs
@@ -807,6 +807,10 @@ impl R3d {
             let (gx, gz) = g.gate_center();
             push(vec3(gx, 1.2, gz), 7.0, vec3(0.75, 0.85, 1.0), 1.0, 50.0);
         }
+        let pulse = 0.5 + 0.5 * (t * 4.0).sin();
+        for &(ex, ey) in &g.planned_entries {
+            push(vec3(ex as f32 + 0.5, 1.2, ey as f32 + 0.5), 5.0, vec3(1.0, 0.12, 0.08), 0.6 + 1.0 * pulse, 30.0);
+        }
         for tw in &g.towers {
             if tw.kind == TowerKind::Magic {
                 let (x, z) = tw.pos();
@@ -935,6 +939,7 @@ impl R3d {
             draw_flag(f, t);
         }
         draw_overlay(&g.map, ov, self.wall_sub);
+        draw_entry_warnings(g, t, self.wall_sub);
         // translucent glows and effects last (they write depth, see glow_material)
         draw_landmarks_glow(g, t);
         draw_towers_glow(g, t);
@@ -1359,6 +1364,33 @@ fn outline(x0: f32, z0: f32, x1: f32, z1: f32, y: f32, c: Color) {
     }
 }
 
+// Expected hero entry points: the walls around them glow red and pulse
+fn draw_entry_warnings(g: &Game, t: f32, n: usize) {
+    if g.planned_entries.is_empty() {
+        return;
+    }
+    let p = 0.5 + 0.5 * (t * 4.0).sin();
+    let fill = [255, 40, 30, (50.0 + 90.0 * p) as u8];
+    let line = [255, 90, 60, (120.0 + 120.0 * p) as u8];
+    let mut mb = MB::new();
+    for &(ex, ey) in &g.planned_entries {
+        for dy in -2..=2 {
+            for dx in -2..=2 {
+                let (x, y) = (ex + dx, ey + dy);
+                let Some(tile) = g.map.get(x, y) else { continue };
+                // walls of the realm's border near the entry point (not rock)
+                let border = DIR4.iter().any(|&(ax, ay)| g.map.get(x + ax, y + ay).map_or(false, |o| o.owner == Owner::Player && !o.solid()));
+                if tile.diggable() && border && dx.abs() + dy.abs() <= 3 && mb.v.len() < 30000 {
+                    block_shell(&mut mb, &g.map, x, y, n, fill, line, 1.0, 0.04);
+                }
+            }
+        }
+    }
+    if let Some(m) = mb.into_plain_mesh() {
+        draw_mesh(&m);
+    }
+}
+
 // Hover feedback: wall blocks get a faint version of the dig-mark box (in the tool colour),
 // floor tiles an outline. While dragging a dig rectangle, every block inside is tinted.
 fn draw_overlay(map: &Map, ov: &Overlay, n: usize) {
diff --git a/src/save.rs b/src/save.rs
index 83e6988..9254514 100644
--- a/src/save.rs
+++ b/src/save.rs
@@ -111,4 +111,24 @@ mod tests {
         let l = from_bytes(json.as_bytes()).expect("load");
         assert_eq!(l.game.map.t.len(), 256 * 256);
     }
+
+    // writes a savegame shortly before a wave (with planned entry points) when DC_SAVE_OUT is set
+    #[test]
+    fn dump_entry_warning_save() {
+        let Ok(path) = std::env::var("DC_SAVE_OUT") else { return };
+        let mut g = Game::new(11, 64, 64);
+        for _ in 0..(60 * 20) {
+            g.update(0.05);
+        }
+        g.wave_timer = 31.0;
+        for _ in 0..30 {
+            g.update(0.05); // the scouts warn 30 s before the wave
+        }
+        assert!(!g.planned_entries.is_empty());
+        let (ex, ey) = g.planned_entries[0];
+        let mut cam = Cam::new(ex as f32 + 0.5, ey as f32 + 0.5);
+        cam.zoom = 12.0;
+        std::fs::write(path, to_json(&g, &cam, &Settings { language: "en".into(), ..Settings::default() })).unwrap();
+    }
 }
+