From d40305baf8a0722cf6128520a5b792fc173c5a93 Mon Sep 17 00:00:00 2001
From: rodri <rgl@antares-labs.eu>
Date: Wed, 22 Feb 2023 21:40:54 +0000
Subject: take player input into account when stepping the simulations.

---
 universe.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)

(limited to 'universe.c')

diff --git a/universe.c b/universe.c
index eea95a8..be481c9 100644
--- a/universe.c
+++ b/universe.c
@@ -8,10 +8,65 @@
 #include "dat.h"
 #include "fns.h"
 
+/* Ship */
+
+static void
+ship_forward(Ship *s, double Δt)
+{
+	Point2 v;
+	Matrix R = {
+		cos(s->θ), -sin(s->θ), 0,
+		sin(s->θ),  cos(s->θ), 0,
+		0, 0, 1,
+	};
+
+	v = mulpt2(xform(Vec2(1,0), R), THRUST*Δt);
+	s->v = addpt2(s->v, v);
+}
+
+static void
+ship_rotate(Ship *s, int dir, double Δt)
+{
+	s->θ += PI*dir*Δt;
+}
+
+static void
+ship_hyperjump(Ship *s)
+{
+	USED(s);
+	return;
+}
+
+static void
+ship_fire(Ship *s)
+{
+	int i;
+	Point2 bv;
+	Matrix R = {
+		cos(s->θ), -sin(s->θ), 0,
+		sin(s->θ),  cos(s->θ), 0,
+		0, 0, 1,
+	};
+
+	bv = mulpt2(xform(Vec2(1,0), R), 10*THRUST);
+
+	for(i = 0; i < nelem(s->rounds); i++)
+		if(!s->rounds[i].fired){
+			s->rounds[i].v = addpt2(s->v, bv);
+			s->rounds[i].θ = s->θ;
+			s->rounds[i].fired++;
+			break;
+		}
+}
+
+/* Universe */
+
 static void
 universe_step(Universe *u, double Δt)
 {
 	integrate(u, u->t, Δt);
+	u->timeacc -= Δt;
+	u->t += Δt;
 }
 
 static void
@@ -59,6 +114,11 @@ inituniverse(Universe *u)
 	u->ships[1].mass = 40e3; /* 40 tons */
 	u->ships[1].kind = WEDGE;
 	u->ships[1].fuel = 200;
+
+	u->ships[0].forward = u->ships[1].forward = ship_forward;
+	u->ships[0].rotate = u->ships[1].rotate = ship_rotate;
+	u->ships[0].hyperjump = u->ships[1].hyperjump = ship_hyperjump;
+	u->ships[0].fire = u->ships[1].fire = ship_fire;
 }
 
 Universe *
-- 
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