shithub: 3dee

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plot3: add camera orbit control

--- a/plot3.c

+++ b/plot3.c

@@ -39,6 +39,7 @@

 Mousectl *mctl;

 Keyboardctl *kctl;

+Mouse om;

 Channel *drawc;

 Image *screenb;

 Plot theplot;

@@ -261,12 +262,38 @@

 }

 void

+lmb(void)

+{

+	static Quaternion orient = {1,0,0,0};

+	Quaternion Δorient;

+	Point3 v;

+

+	if((om.buttons^mctl->buttons) != 0)

+		return;

+

+	Δorient = orient;

+	qball(screen->r, om.xy, mctl->xy, &orient, nil);

+	Δorient = mulq(Δorient, invq(orient));

+

+	/* orbit camera around the center */

+	v = subpt3(cam->p, theplot.bbox.c);

+	v = vcs2world(cam, qsandwichpt3(Δorient, world2vcs(cam, v)));

+	movecamera(cam, addpt3(theplot.bbox.c, v));

+	aimcamera(cam, theplot.bbox.c);

+

+	redrawb();

+}

+

+void

 mouse(void)

 {

+	if(mctl->buttons & 1)

+		lmb();

 	if(mctl->buttons & 8)

 		zoomin();

 	if(mctl->buttons & 16)

 		zoomout();

+	om = mctl->Mouse;

 }

 void

-- 

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