shithub: musw

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randomly position the ships, facing each other.

--- a/musw.c

+++ b/musw.c

@@ -124,7 +124,7 @@

 		0, 0, 1

 	}, R = {

 		cos(ship->θ), -sin(ship->θ), 0,

-		sin(ship->θ), cos(ship->θ), 0,

+		sin(ship->θ),  cos(ship->θ), 0,

 		0, 0, 1

 	};

--- a/universe.c

+++ b/universe.c

@@ -28,20 +28,34 @@

 void

 inituniverse(Universe *u)

 {

-	u->ships[0].p = Pt2(SCRW/2-50,SCRH/2-50,1);

-	u->ships[0].θ = (180+45)*DEG;

+	int i;

+	double θ;

+	Point2 aimstar;

+

+	u->star.p = Pt2(0,0,1);

+	u->star.mass = 5.97e24; /* earth's mass */

+

+	θ = ntruerand(360)*DEG;

+	for(i = 0; i < nelem(u->ships); i++){

+		θ += i*180*DEG;

+		Matrix R = {

+			cos(θ), -sin(θ), 0,

+			sin(θ),  cos(θ), 0,

+			0, 0, 1

+		};

+

+		u->ships[i].p = addpt2(Pt2(0,0,1), mulpt2(xform(Vec2(1,0), R), 200));

+		aimstar = subpt2(u->star.p, u->ships[i].p);

+		u->ships[i].θ = atan2(aimstar.y, aimstar.x);

+	}

+

 	u->ships[0].mass = 10e3; /* 10 tons */

 	u->ships[0].kind = NEEDLE;

 	u->ships[0].fuel = 100;

-	u->ships[1].p = Pt2(-SCRW/2+50,-SCRH/2+50,1);

-	u->ships[1].θ = 45*DEG;

 	u->ships[1].mass = 40e3; /* 40 tons */

 	u->ships[1].kind = WEDGE;

 	u->ships[1].fuel = 200;

-

-	u->star.p = Pt2(0,0,1);

-	u->star.mass = 5.97e24; /* earth's mass */

 }

 Universe *