X-Git-Url: http://git.localhorst.tv/?a=blobdiff_plain;f=src%2Fworld%2FEntityController.hpp;h=ce3d0cf00998fbccf7826aa052766aca7a66cbe1;hb=e4a1425dccd0ba9b106e415dd02809f4308a85ee;hp=526a3222fa4d985fc53094ab7e2c649376dfdd2e;hpb=0ab149c70b3f984b2cc0c7a122b4aa347bc5fd79;p=blank.git

diff --git a/src/world/EntityController.hpp b/src/world/EntityController.hpp
index 526a322..ce3d0cf 100644
--- a/src/world/EntityController.hpp
+++ b/src/world/EntityController.hpp
@@ -26,8 +26,15 @@ struct EntityController {
 		const glm::vec3 &add,
 		float max
 	) noexcept;
-	/// give a force that makes state's velocity converge with given target velocity
-	/// over 1/n seconds
+	/// give a force that makes state come to a halt over 1/n seconds
+	static inline glm::vec3 Halt(
+		const EntityState &state,
+		float n
+	) noexcept {
+		return state.velocity * -n;
+	}
+	/// give a force that makes state's velocity converge with given
+	/// target velocity over 1/n seconds
 	static inline glm::vec3 TargetVelocity(
 		const glm::vec3 &target,
 		const EntityState &state,
@@ -35,6 +42,25 @@ struct EntityController {
 	) noexcept {
 		return (target - state.velocity) * n;
 	}
+	/// give a force that makes state go after target with an attempted
+	/// acceleration over 1/n seconds and a speed of s
+	static inline glm::vec3 Seek(
+		const EntityState &state,
+		const EntityState &target,
+		float s,
+		float n
+	) noexcept {
+		return TargetVelocity(normalize(target.Diff(state)) * s, state, n);
+	}
+	/// opposite of seek
+	static inline glm::vec3 Flee(
+		const EntityState &state,
+		const EntityState &target,
+		float s,
+		float n
+	) noexcept {
+		return TargetVelocity(normalize(state.Diff(target)) * s, state, n);
+	}
 
 };