Add tracers.

4 files changed, 77 insertions, 3 deletions

diff --git a/src/game/effects.cpp b/src/game/effects.cpp
new file mode 100644
index 0000000..99c8be8
--- /dev/null
+++ b/src/game/effects.cpp
@@ -0,0 +1,37 @@
+#include "game.hpp"
+
+namespace game {
+
+effect_t::effect_t(state_t *game_) : world::entity_t(ET_EFFECT)
+{
+	game = game_;
+}
+
+fx_tracer_t::fx_tracer_t(state_t *game_, v2f_t x0_, v2f_t x1_) : effect_t(game_)
+{
+	ttl = game->now + 0.07;
+
+	x0 = x0_;
+	x1 = x1_;
+
+	render_bounds[0] = x0;
+	render_bounds[1] = x1;
+	render_bounds = render_bounds.norm();
+}
+
+void fx_tracer_t::render_to(render::state_t *render)
+{
+	v2f_t x0l, x1l;
+	float t;
+
+	t = 1.0f - (ttl - game->now) / 0.07f * 0.7f;
+
+	x0l[0] = lerp(x0[0], x1[0], t);
+	x0l[1] = lerp(x0[1], x1[1], t);
+	x1l[0] = lerp(x0[0], x1[0], t + 0.3f);
+	x1l[1] = lerp(x0[1], x1[1], t + 0.3f);
+
+	render->render_line(x0l, x1l, sf::Color::Yellow);
+}
+
+} // namespace game
diff --git a/src/game/game.cpp b/src/game/game.cpp
index 96f76d3..1619de0 100644
--- a/src/game/game.cpp
+++ b/src/game/game.cpp
@@ -82,6 +82,12 @@ void state_t::command(v2f_t x)
 	}
 }
 
+void state_t::add_effect(effect_t *effect)
+{
+	effects.insert(effect);
+	effect->link(&world);
+}
+
 void state_t::tick(double now_, double dt_)
 {
 	union {
@@ -145,6 +151,15 @@ void state_t::tick(double now_, double dt_)
 			i++;
 		}
 	}
+
+	for (auto i = std::begin(effects); i != std::end(effects);) {
+		if (now > (*i)->ttl) {
+			(*i)->unlink();
+			//delete *i; FIXME
+			i = effects.erase(i);
+		} else
+			i++;
+	}
 }
 
 roll_params_t::roll_params_t(size_t sides_)
diff --git a/src/game/game.hpp b/src/game/game.hpp
index a952576..0a1d0ca 100644
--- a/src/game/game.hpp
+++ b/src/game/game.hpp
@@ -2,7 +2,8 @@
 
 namespace game {
 	enum {
-		ET_UNIT
+		ET_UNIT,
+		ET_EFFECT
 	};
 
 	enum {
@@ -119,7 +120,7 @@ namespace game {
 		v2f_t last_target_x;
 
 	public:
-		human_t(game::state_t *game);
+		human_t(game::state_t *game_);
 		void render_to(render::state_t *render);
 
 		void wake(unit_t *by_whom);
@@ -132,7 +133,7 @@ namespace game {
 		double next_targetting = -INFINITY;
 
 	public:
-		alien_t(game::state_t *game);
+		alien_t(game::state_t *game_);
 		void render_to(render::state_t *render);
 
 		void wake(unit_t *by_whom);
@@ -140,4 +141,20 @@ namespace game {
 		void think(void);
 		void die(void);
 	};
+
+	class effect_t : public world::entity_t {
+	public:
+		game::state_t *game;
+
+		double ttl = +INFINITY;
+		effect_t(game::state_t *game_);
+	};
+
+	class fx_tracer_t : public effect_t {
+		v2f_t x0, x1;
+
+	public:
+		fx_tracer_t(game::state_t *game_, v2f_t x0_, v2f_t x1_);
+		void render_to(render::state_t *render);
+	};
 };
diff --git a/src/game/units.cpp b/src/game/units.cpp
index 0f992f9..c50a3fb 100644
--- a/src/game/units.cpp
+++ b/src/game/units.cpp
@@ -297,8 +297,13 @@ void human_t::think(void)
 
 				trace = world->trace(x, target->x, CF_SOLID);
 				if (!trace.hit) {
+					fx_tracer_t *tracer;
+
 					last_attack = game->now;
 					try_attack(target);
+
+					tracer = new fx_tracer_t(game, x, target->x);
+					game->add_effect(tracer);
 				}
 			}