From 5c42dc4199ebc07f067ebd629ed651822bfae234 Mon Sep 17 00:00:00 2001
From: Anuken <arnukren@gmail.com>
Date: Sun, 6 Jul 2025 12:36:32 -0400
Subject: [PATCH] Debug renderer for unit hitboxes

---
 core/assets/bundles/bundle.properties         |  1 +
 core/src/mindustry/Vars.java                  |  2 +
 core/src/mindustry/core/Renderer.java         |  4 ++
 .../graphics/DebugCollisionRenderer.java      | 71 +++++++++++++++++++
 4 files changed, 78 insertions(+)
 create mode 100644 core/src/mindustry/graphics/DebugCollisionRenderer.java

diff --git a/core/assets/bundles/bundle.properties b/core/assets/bundles/bundle.properties
index 682c627bc6..3a3e0792f4 100644
--- a/core/assets/bundles/bundle.properties
+++ b/core/assets/bundles/bundle.properties
@@ -1393,6 +1393,7 @@ keybind.chat_scroll.name = Chat Scroll
 keybind.chat_mode.name = Change Chat Mode
 keybind.drop_unit.name = Drop Unit
 keybind.zoom_minimap.name = Zoom Minimap
+keybind.detach_camera.name = Toggle Free Camera
 mode.help.title = Description of modes
 mode.survival.name = Survival
 mode.survival.description = The normal mode. Limited resources and automatic incoming waves.\n[gray]Requires enemy spawns in the map to play.
diff --git a/core/src/mindustry/Vars.java b/core/src/mindustry/Vars.java
index ecaca32343..f3b4849ee6 100644
--- a/core/src/mindustry/Vars.java
+++ b/core/src/mindustry/Vars.java
@@ -202,6 +202,8 @@ public class Vars implements Loadable{
     /** Whether to draw shadows of blocks at map edges and static blocks.
      * Do not change unless you know exactly what you are doing.*/
     public static boolean enableDarkness = true;
+    /** Whether to draw debug lines for collisions. */
+    public static boolean drawCollisionDebug = false;
     /** application data directory, equivalent to {@link Settings#getDataDirectory()} */
     public static Fi dataDirectory;
     /** data subdirectory used for screenshots */
diff --git a/core/src/mindustry/core/Renderer.java b/core/src/mindustry/core/Renderer.java
index 3afdb57201..ebcc82f852 100644
--- a/core/src/mindustry/core/Renderer.java
+++ b/core/src/mindustry/core/Renderer.java
@@ -415,6 +415,10 @@ public class Renderer implements ApplicationListener{
 
         Groups.draw.draw(Drawc::draw);
 
+        if(drawCollisionDebug){
+            DebugCollisionRenderer.draw();
+        }
+
         Draw.reset();
         Draw.flush();
         Draw.sort(false);
diff --git a/core/src/mindustry/graphics/DebugCollisionRenderer.java b/core/src/mindustry/graphics/DebugCollisionRenderer.java
new file mode 100644
index 0000000000..1ecd332c65
--- /dev/null
+++ b/core/src/mindustry/graphics/DebugCollisionRenderer.java
@@ -0,0 +1,71 @@
+package mindustry.graphics;
+
+import arc.*;
+import arc.graphics.*;
+import arc.graphics.g2d.*;
+import arc.math.*;
+import arc.math.geom.*;
+import arc.util.*;
+import mindustry.core.*;
+import mindustry.gen.*;
+import mindustry.world.*;
+
+import static arc.Core.*;
+import static mindustry.Vars.*;
+
+public class DebugCollisionRenderer{
+
+    public static void draw(){
+        Rect rect = camera.bounds(new Rect());
+        Draw.draw(Layer.overlayUI, () -> {
+            //hitboxes
+            Draw.color(Color.green, 0.3f);
+            Groups.draw.each(d -> {
+                if(d instanceof Hitboxc h && rect.overlaps(Tmp.r1.setCentered(d.x(), d.y(), d.clipSize()))){
+                    Fill.square(d.x(), d.y(), h.hitSize()/2f);
+                }
+            });
+
+            //tile hitboxes for units
+            Lines.stroke(0.3f, Color.magenta);
+
+            int rx = Mathf.clamp((int)(Core.camera.width / tilesize / 2) + 1, 0, world.width()/2);
+            int ry = Mathf.clamp((int)(Core.camera.height / tilesize / 2) + 1, 0, world.height()/2);
+
+            for(int x = -rx; x <= rx; x++){
+                for(int y = -ry; y <= ry; y++){
+                    int wx = World.toTile(Core.camera.position.x) + x;
+                    int wy = World.toTile(Core.camera.position.y) + y;
+                    Tile tile = world.tile(wx, wy);
+                    if(tile != null && tile.solid()){
+                        Draw.color(tile.legSolid() ? Color.pink : Color.magenta);
+                        Lines.rect(wx * tilesize - tilesize/2f, wy * tilesize - tilesize/2f, tilesize, tilesize);
+                    }
+                }
+            }
+
+
+            Groups.draw.each(d -> {
+                if(d instanceof Unit u && rect.overlaps(Tmp.r1.setCentered(u.x, u.y, d.clipSize()))){
+                    u.hitboxTile(Tmp.r1);
+
+                    Lines.rect(Tmp.r1);
+                }
+            });
+
+            Lines.stroke(0.5f);
+            //physics
+            Draw.color(Color.red, 0.5f);
+            Groups.draw.each(d -> {
+                if(d instanceof Unit u && rect.overlaps(Tmp.r1.setCentered(u.x, u.y, u.clipSize()))){
+                    Lines.circle(u.x, u.y, u.hitSize * unitCollisionRadiusScale);
+                }
+            });
+            Draw.reset();
+
+        });
+
+
+        Draw.reset();
+    }
+}