1 files changed, 9 insertions, 0 deletions
diff --git a/src/game/build_graph.hpp b/src/game/build_graph.hpp
index bf83a18..4452139 100644
--- a/src/game/build_graph.hpp
+++ b/src/game/build_graph.hpp
@@ -34,6 +34,8 @@ struct MaterialDef {
     bool  blocks_projectiles; // stops cannon shells (wood yes; bg-brace/rope no)
     bool  blocks_beam;        // stops laser beams (all yes in Forts)
     float half_width;       // visual thickness
+    float cost_metal;       // metal spent placing one strut of this material
+    float cost_energy;      // energy spent placing one strut of this material
     float r, g, b, a;       // visual colour (also tints the texture)
     std::string name;
     std::string texture;    // CC0 placeholder path ("" = flat colour)
@@ -104,6 +106,13 @@ public:
     // not block splash (pure radius falloff, like Forts AoE).
     void apply_splash(float x, float y, float radius, float damage, float knockback);
 
+    // Directional velocity kick to free nodes within `radius` of (x,y), along the
+    // unit vector (dx,dy), with linear falloff. Weapon recoil uses this to shove
+    // the FIRING structure back (Forts' Recoil), unlike apply_splash's radial
+    // knockback on the target. No damage: recoil only moves the fort.
+    void apply_recoil(float x, float y, float radius,
+                      float dx, float dy, float strength);
+
     // Trace a laser beam from (ox,oy) along (dx,dy) up to `range`: damage +
     // optionally ignite EVERY strut it crosses, passing through beam-transparent
     // materials (bg-brace, ropes) and STOPPING at the first blocking one (wood).