From 96b12298b5aacfdd8564eb3eeff7fef453b9c8a0 Mon Sep 17 00:00:00 2001
From: Daniel Karbach <daniel.karbach@localhorst.tv>
Date: Sun, 10 Dec 2017 00:00:55 +0100
Subject: [PATCH] remove ability to fly at will

---
 src/creature/Situation.hpp | 2 +-
 src/creature/creature.cpp  | 8 ++++++++
 src/creature/goal.cpp      | 2 +-
 src/ui/ui.cpp              | 6 +++++-
 4 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/creature/Situation.hpp b/src/creature/Situation.hpp
index 8df8a7a..a442d44 100644
--- a/src/creature/Situation.hpp
+++ b/src/creature/Situation.hpp
@@ -53,6 +53,7 @@ public:
 	bool OnPlanet() const noexcept;
 	world::Planet &GetPlanet() const noexcept { return *planet; }
 	bool OnSurface() const noexcept;
+	bool OnGround() const noexcept;
 	const glm::dvec3 &Position() const noexcept { return state.pos; }
 	glm::dvec3 SurfaceNormal() const noexcept;
 	world::Tile &GetTile() const noexcept;
@@ -66,7 +67,6 @@ public:
 	void Move(const glm::dvec3 &dp) noexcept;
 	void Accelerate(const glm::dvec3 &dv) noexcept;
 	void EnforceConstraints(State &) noexcept;
-	void CheckWrap() noexcept;
 
 	void Heading(const glm::dvec3 &h) noexcept { state.dir = h; }
 	const glm::dvec3 &Heading() const noexcept { return state.dir; }
diff --git a/src/creature/creature.cpp b/src/creature/creature.cpp
index 72d0b3f..b609fe8 100644
--- a/src/creature/creature.cpp
+++ b/src/creature/creature.cpp
@@ -927,6 +927,10 @@ bool Situation::OnSurface() const noexcept {
 	return type == PLANET_SURFACE;
 }
 
+bool Situation::OnGround() const noexcept {
+	return OnSurface() && glm::length2(state.pos) < (planet->Radius() + 0.05) * (planet->Radius() + 0.05);
+}
+
 glm::dvec3 Situation::SurfaceNormal() const noexcept {
 	return planet->NormalAt(state.pos);
 }
@@ -1059,6 +1063,10 @@ glm::dvec3 Steering::Force(const Situation::State &s) const noexcept {
 			result += TargetVelocity(s, diff * std::min(dist * force, speed) / dist, force);
 		}
 	}
+	// remove vertical component, if any
+	const glm::dvec3 normal(c.GetSituation().GetPlanet().NormalAt(s.pos));
+	result += normal * glm::dot(normal, result);
+	// clamp to max
 	if (glm::length2(result) > max_force * max_force) {
 		result = glm::normalize(result) * max_force;
 	}
diff --git a/src/creature/goal.cpp b/src/creature/goal.cpp
index 65de6c0..abac467 100644
--- a/src/creature/goal.cpp
+++ b/src/creature/goal.cpp
@@ -340,7 +340,7 @@ void IngestGoal::Action() {
 }
 
 bool IngestGoal::OnSuitableTile() {
-	if (!GetSituation().OnSurface()) {
+	if (!GetSituation().OnGround()) {
 		return false;
 	}
 	const world::TileType &t = GetSituation().GetTileType();
diff --git a/src/ui/ui.cpp b/src/ui/ui.cpp
index c3397fe..9d73b92 100644
--- a/src/ui/ui.cpp
+++ b/src/ui/ui.cpp
@@ -231,7 +231,11 @@ void CreaturePanel::Draw(graphics::Viewport &viewport) noexcept {
 	}
 
 	pos->Text(VectorString(c->GetSituation().Position(), 2));
-	tile->Text(c->GetSituation().GetTileType().label);
+	tile->Text(c->GetSituation().GetTileType().label + (
+		c->GetSituation().OnGround()
+			? (c->GetSituation().Moving() ? " (moving)" : " (standing)")
+			: (c->GetSituation().Moving() ? " (flying)" : " (hovering)")
+	));
 	head->Text(VectorString(c->GetSituation().Heading(), 2));
 
 	const creature::Composition &comp = c->GetComposition();
-- 
2.39.2