From 98982513f97f449fd200132d0f19130ab31e2c36 Mon Sep 17 00:00:00 2001
From: Aki <please@ignore.pl>
Date: Sat, 19 Nov 2022 13:26:42 +0100
Subject: Implemented funky floating movement

It's far from complete but it's hilarious and deserves to be a commit
---
 battles/include/kurator/battles/components.h |  6 +++++-
 battles/src/BaseBattle.cpp                   | 22 ++++++++++++++--------
 battles/src/Builder.cpp                      |  2 +-
 3 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/battles/include/kurator/battles/components.h b/battles/include/kurator/battles/components.h
index 8f5813b..d4363c4 100644
--- a/battles/include/kurator/battles/components.h
+++ b/battles/include/kurator/battles/components.h
@@ -34,7 +34,11 @@ struct AIState
 
 struct FloatingMovement
 {
-	double speed;  // linear and instant angular for now
+	double max_speed;
+	double acceleration;
+	double deceleration;
+	double destination_boundary;
+	Point speed = {0.0, 0.0};
 };
 
 
diff --git a/battles/src/BaseBattle.cpp b/battles/src/BaseBattle.cpp
index 98af764..e102d79 100644
--- a/battles/src/BaseBattle.cpp
+++ b/battles/src/BaseBattle.cpp
@@ -87,14 +87,20 @@ void
 BaseBattle::floating_movement(const float dt)
 {
 	auto view = _registry.view<Transform, FloatingMovement, AIState>();
-	for (auto&& [entity, self, movement, ai] : view.each()) {
-		const double speed = movement.speed * dt;
-		const Point offset = ai.destination - self.position;
-		if (offset.magnitude() > speed) {
-			const Point move = offset.normalized().scale(speed);
-			self.position.x += move.x;
-			self.position.y += move.y;
-		}
+	for (auto&& [entity, transform, movement, ai] : view.each()) {
+		const auto offset = ai.destination - transform.position;
+		const auto at_destination = offset.magnitude() > movement.destination_boundary;
+		const auto acceleration =
+			at_destination ?
+			offset.normalized().scale(movement.acceleration * dt) :
+			offset.normalized().scale(-1 * movement.deceleration * dt);
+		movement.speed.x += acceleration.x;
+		movement.speed.y += acceleration.y;
+		if (movement.speed.magnitude() > movement.max_speed)
+			movement.speed = movement.speed.normalized().scale(movement.max_speed);
+		const auto speed = movement.speed.scale(dt);
+		transform.position.x += speed.x;
+		transform.position.y += speed.y;
 	}
 }
 
diff --git a/battles/src/Builder.cpp b/battles/src/Builder.cpp
index 228e893..4ead634 100644
--- a/battles/src/Builder.cpp
+++ b/battles/src/Builder.cpp
@@ -30,7 +30,7 @@ Builder::operator()(const universe::ShipType& ship_type, const int team) const
 	registry.emplace<universe::ShipType>(entity, ship_type);
 	registry.emplace<Team>(entity, team);
 	registry.emplace<Transform>(entity, spawner.get(team));
-	registry.emplace<FloatingMovement>(entity, 0.4);
+	registry.emplace<FloatingMovement>(entity, 0.5, 2.0, 3.0, 0.1);
 	registry.emplace<AIState>(entity, Point{0.0, 0.0});
 	registry.emplace<HitPoints>(entity, ship_type.base_health_points);
 	return entity;
-- 
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