Index: draw.html
==================================================================
--- draw.html
+++ draw.html
@@ -55,11 +55,11 @@
 var delta_position = [0,0,0];
 
 
 //  Use to rotate selected points about a vector line
 var selection_rotation_axis = null;
-var rotation_center = origin.slice(0);
+var rotation_center = [0,0,0];
 var zoom_center = origin.slice(0);
 
 var selected_points_start_loc = [];
 
 
@@ -440,12 +440,12 @@
 addKeyListener(1002, function(e, s, lasts){
 	if(s == 0){
 		delta_horizontal_angle = 0;
 		delta_vertical_angle = 0; }
 		
-	else if(getKeyState(16)){  // use default as rotation center
-		rotation_center = origin.slice(0); }
+	//else if(getKeyState(16)){  // use default as rotation center
+		//rotation_center = origin.slice(0); }
 		
 	else if(highlight_object > 0){  // use highlighted points for rotation center.
 		if(highlight_object < points.length){
 			rotation_center = points[highlight_object].slice(0); }
 			
@@ -457,15 +457,17 @@
 			selection_rotation_axis = vector_minus(pointa, pointb);
 			if(vector_dot(selection_rotation_axis, view_transform[2]) < 0){
 				vector_scale(-1, selection_rotation_axis, selection_rotation_axis); }}}  // axis should be pointing vertical, horizontal motions along the screen will dictate motion angle.
 	
 	else if(selected_points.length){  //find average of selected points for rotation center
-		var rotation_center = [0,0,0];
+		rotation_center = [0,0,0];
 	    for(var i = 0; i < selected_points.length; ++i){
-			vector_add(rotation_center, selected_points[i], rotation_center); }
+			vector_add(rotation_center, points[selected_points[i]], rotation_center); }
 		var l = selected_points.length;
 		rotation_center = [rotation_center[0]/l, rotation_center[1]/l, rotation_center[2]/l];
+        // alert("Rotation center: " + rotation_center);
+
 		}});
 
 
 function writeMsg(canvas, msg){
 	var lines = msg.split("\n");
@@ -484,13 +486,10 @@
     var rotation = vector_rotation(norm, theta);
     
     view_transform = matrix_mult(rotation, view_transform); }
 	
 	
-function rotatePoint(point, axis, angle, center){
-}
-    
     
     
 function rotateHorizontal(theta){
     rotateView([0, 1, 0], theta, false); }
     
@@ -932,19 +931,30 @@
 		
 		else{
 			moveCamera(delta_position, false); }
 			
 			
-		if(!selected_points.length){
+		if(!selected_points.length || getKeyState(16)){
 			if(delta_horizontal_angle) rotateHorizontal(delta_horizontal_angle);
 			if(delta_vertical_angle) rotateVertical(delta_vertical_angle); }
 			
-		else{
+		else{ // rotate selected points
             var rotation_transform;
             if(selection_rotation_axis){  // 
-                
-            }}}
+                rotation_transform = vector_rotation(selection_rotation_axis, delta_horizontal_angle); }
+            else{
+                rotation_transform = vector_rotation([0, 1, 0], delta_horizontal_angle);
+                rotation_transform = matrix_mult(vector_rotation([0, 0, 1], -delta_vertical_angle), rotation_transform); }
+
+            for(var i = 0; i < selected_points.length; ++i){
+                var index = selected_points[i];
+                var pt = points[index];
+
+                vector_minus(pt, rotation_center, pt);
+                pt = matrix_mult(rotation_transform, [pt])[0];
+                vector_add(pt, rotation_center, pt);
+                points[index] = pt; }}
         
        
         //  overwrite point projections
         //  TODO this may not be perfect if points are deleted etc.        
         point_projections.length = 0;