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vmodeled: added the ability to rotate a model.

--- a/vmodeled/main.c

+++ b/vmodeled/main.c

@@ -24,6 +24,7 @@

 RFrame worldrf;

 VModel *model;

+double θ;

 double scale = 1;

 void resized(void);

@@ -131,8 +132,13 @@

 		scale, 0, 1,

 		0, scale, 1,

 		0, 0, 1,

+	}, R = {

+		cos(θ), -sin(θ), 1,

+		sin(θ),  cos(θ), 1,

+		0, 0, 1,

 	};

+	mulm(S, R);

 	p = mdl->pts;

 	for(s = mdl->strokefmt; s != 0 && p-mdl->pts < mdl->npts; s++)

 		switch(*s){

@@ -168,8 +174,24 @@

 }

 void

-rmb(Mousectl *, Keyboardctl *)

+rmb(Mousectl *mc, Keyboardctl *)

 {

+	Point2 p;

+	double oldmθ, oldθ;

+

+	p = fromscreen(mc->xy);

+	oldmθ = atan2(p.y, p.x);

+	oldθ = θ;

+

+	for(;;){

+		readmouse(mc);

+		if(mc->buttons != 4)

+			break;

+		p = fromscreen(mc->xy);

+		θ = oldθ + (atan2(p.y, p.x) - oldmθ);

+		fprint(2, "θ %g\n", θ);

+		redraw();

+	}

 }

 void

@@ -178,7 +200,7 @@

 	Point2 mpos;

 	mpos = fromscreen(mc->xy);

-	fprint(2, "%v\n", mpos);

+	fprint(2, "mpos %v\n", mpos);

 }

 void