Recoil and armor

1 files changed, 15 insertions, 0 deletions

diff --git a/src/game/build_graph.cpp b/src/game/build_graph.cpp
index 032bbf5..a1195af 100644
--- a/src/game/build_graph.cpp
+++ b/src/game/build_graph.cpp
@@ -291,6 +291,21 @@ int BuildGraph::kill_grounded() {
 // Destruction
 // =============================================================================
 
+void BuildGraph::apply_recoil(float x, float y, float radius,
+                              float dx, float dy, float strength) {
+    if (radius <= 0.0f || strength <= 0.0f) return;
+
+    for (auto& n : nodes) {
+        if (n.is_foundation) continue;   // pinned: the ground eats the recoil
+        float ox = n.x - x, oy = n.y - y;
+        float d = std::sqrt(ox*ox + oy*oy);
+        if (d >= radius) continue;
+        float f = 1.0f - d / radius;     // linear falloff, as in apply_splash
+        n.vx += dx * strength * f;
+        n.vy += dy * strength * f;
+    }
+}
+
 void BuildGraph::apply_splash(float x, float y, float radius, float damage,
                              float knockback) {
     if (radius <= 0.0f) return;