libgeometry revamp

1 files changed, 0 insertions, 65 deletions

diff --git a/sys/src/libgeometry/qball.c b/sys/src/libgeometry/qball.c
deleted file mode 100644
index aaf4e6dfd..000000000
--- a/sys/src/libgeometry/qball.c
+++ /dev/null
@@ -1,65 +0,0 @@
-/*
- * Ken Shoemake's Quaternion rotation controller
- */
-#include <u.h>
-#include <libc.h>
-#include <draw.h>
-#include <event.h>
-#include <geometry.h>
-#define	BORDER	4
-static Point ctlcen;		/* center of qball */
-static int ctlrad;		/* radius of qball */
-static Quaternion *axis;	/* constraint plane orientation, 0 if none */
-/*
- * Convert a mouse point into a unit quaternion, flattening if
- * constrained to a particular plane.
- */
-static Quaternion mouseq(Point p){
-	double qx=(double)(p.x-ctlcen.x)/ctlrad;
-	double qy=(double)(p.y-ctlcen.y)/ctlrad;
-	double rsq=qx*qx+qy*qy;
-	double l;
-	Quaternion q;
-	if(rsq>1){
-		rsq=sqrt(rsq);
-		q.r=0.;
-		q.i=qx/rsq;
-		q.j=qy/rsq;
-		q.k=0.;
-	}
-	else{
-		q.r=0.;
-		q.i=qx;
-		q.j=qy;
-		q.k=sqrt(1.-rsq);
-	}
-	if(axis){
-		l=q.i*axis->i+q.j*axis->j+q.k*axis->k;
-		q.i-=l*axis->i;
-		q.j-=l*axis->j;
-		q.k-=l*axis->k;
-		l=sqrt(q.i*q.i+q.j*q.j+q.k*q.k);
-		if(l!=0.){
-			q.i/=l;
-			q.j/=l;
-			q.k/=l;
-		}
-	}
-	return q;
-}
-void qball(Rectangle r, Mouse *m, Quaternion *result, void (*redraw)(void), Quaternion *ap){
-	Quaternion q, down;
-	Point rad;
-	axis=ap;
-	ctlcen=divpt(addpt(r.min, r.max), 2);
-	rad=divpt(subpt(r.max, r.min), 2);
-	ctlrad=(rad.x<rad.y?rad.x:rad.y)-BORDER;
-	down=qinv(mouseq(m->xy));
-	q=*result;
-	for(;;){
-		*m=emouse();
-		if(!m->buttons) break;
-		*result=qmul(q, qmul(down, mouseq(m->xy)));
-		(*redraw)();
-	}
-}