From def701e42a40a1d95c3195be0c07d9b7b71cdd1d Mon Sep 17 00:00:00 2001
From: Paweł Redman <pawel.redman@gmail.com>
Date: Tue, 19 Dec 2017 13:41:52 +0100
Subject: Automatic camera following.

---
 src/common.hpp         | 11 ++++-------
 src/game/game.cpp      |  1 +
 src/game/interface.cpp | 20 ++++++++++++++++++++
 src/game/units.cpp     |  2 ++
 4 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/src/common.hpp b/src/common.hpp
index 3131b69..13b843d 100644
--- a/src/common.hpp
+++ b/src/common.hpp
@@ -211,18 +211,14 @@ namespace game {
 	};
 
 	class state_t {
-	protected:
-		friend entity_t;
-		friend interface::state_t;
-
-		std::unordered_set<entity_t*> awake_entities;
-		std::unordered_set<unit_t*> selected_units;
 	public:
 		world::world_t world;
 		interface::state_t *interface;
 		double now = 0.0, dt;
 		bool paused = false;
 		procgen::prng_t dice_prng;
+		std::unordered_set<entity_t*> awake_entities;
+		std::unordered_set<unit_t*> selected_units;
 
 		void start(void);
 		void stop(void);
@@ -244,11 +240,12 @@ namespace interface {
 		float em;
 
 		struct {
-			sf::Vector2f center;
+			v2f_t center;
 			int target_zoom = 3;
 			float zoom = 3.0f;
 			bool panning = false;
 			sf::Vector2f pan_ref;
+			bool following = true;
 		} camera;
 
 		struct {
diff --git a/src/game/game.cpp b/src/game/game.cpp
index fedc403..22b883e 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -74,6 +74,7 @@ void state_t::start(void)
 	soldier->place(&world, v2f_t(1.5, 0.5));
 	soldier = new unit_soldier_t(this);
 	soldier->place(&world, v2f_t(2.5, 0.5));
+	select(rectf_t(v2f_t(0.5, 0.5), v2f_t(2.5, 0.5)));
 }
 
 void state_t::stop(void)
diff --git a/src/game/interface.cpp b/src/game/interface.cpp
index 67f5482..6512576 100644
--- a/src/game/interface.cpp
+++ b/src/game/interface.cpp
@@ -27,6 +27,20 @@ void state_t::tick(double dt)
 
 	size = window->getSize();
 
+	if (!game->selected_units.size())
+		camera.following = false;
+
+	if (camera.following) {
+		v2f_t goal(0, 0);
+
+		for (entity_t *ent : game->selected_units)
+			goal += ent->render_bounds.center();
+		goal /= game->selected_units.size();
+
+		camera.center[0] = expfade(camera.center[0], goal[0], 20, dt);
+		camera.center[1] = expfade(camera.center[1], goal[1], 20, dt);
+	}
+
 	camera.zoom = expfade(camera.zoom, camera.target_zoom, 15, dt);
 
 	{
@@ -67,6 +81,7 @@ void state_t::tick(double dt)
 				break;
 
 			case sf::Mouse::Button::Middle:
+				camera.following = false;
 				camera.panning = true;
 				camera.pan_ref = wmouse;
 				break;
@@ -110,6 +125,11 @@ void state_t::tick(double dt)
 				else
 					print(text::get(text::UNPAUSED));
 				break;
+
+			case sf::Keyboard::Key::F:
+				camera.following = true;
+				break;
+
 			case sf::Keyboard::Key::F1:
 				debug_draw_cmodels ^= 1;
 				print("debug_draw_cmodels = " + std::to_string(debug_draw_cmodels));
diff --git a/src/game/units.cpp b/src/game/units.cpp
index 4e2b2aa..da6b1a3 100644
--- a/src/game/units.cpp
+++ b/src/game/units.cpp
@@ -431,6 +431,8 @@ void unit_soldier_t::on_think(void)
 
 void unit_soldier_t::on_death(void)
 {
+	game->selected_units.erase(this);
+
 	render_size[0] = v2f_t(-0.75f, -0.5f);
 	render_size[1] = v2f_t(+0.75f, +0.5f);
 	render_layer = -1;
-- 
cgit