Move drawing to separate thread

@@ -339,8 +339,6 @@ fn main() {
     canvas.init_events();
 
     let (tx, rx) = mpsc::channel();
-    let tx1 = mpsc::Sender::clone(&tx);
-    canvas.start_events(tx);
 
     let i = Vector(Fractional(  0,1), Fractional(-35,1), Fractional(0,1));
     let j = Vector(Fractional( 30,1), Fractional( 17,1), Fractional(0,1));
@@ -351,34 +349,35 @@ fn main() {
         (n / d + if (n % d).abs() < (n / 2).abs() { 0 } else { 1 }) as i32
     }
 
+    canvas.start_events(tx);
+
     thread::spawn(move || {
+        let mut deg :i32 = 0;
         loop {
-            tx1.send(0).unwrap();
-            thread::sleep(time::Duration::from_millis(10));
+            let rot :TMatrix<Fractional> = rotate_z(deg) * rotate_x(-deg);
+
+            let Vector(ix, iy, _) = rot.apply(&i);
+            let Vector(jx, jy, _) = rot.apply(&j);
+            let Vector(kx, ky, _) = rot.apply(&k);
+
+            let pg = Polygon(
+                Coordinates(vec!( Coordinate(to_i32(ix), to_i32(iy))
+                                , Coordinate(to_i32(jx), to_i32(jy))
+                                , Coordinate(to_i32(kx), to_i32(ky)) )));
+            canvas.clear();
+            canvas.draw(&pg, Coordinate(75,75));
+            canvas.show();
+
+            deg = (deg + 1) % 360;
+
+            thread::sleep(time::Duration::from_millis(5));
         }
     });
 
-    let mut deg :i32 = 0;
-
     for x in rx {
         match x {
             1 => break,
-            _ => {
-                let rot :TMatrix<Fractional> = rotate_z(deg);
-                let Vector(ix, iy, _) = rot.apply(&i);
-                let Vector(jx, jy, _) = rot.apply(&j);
-                let Vector(kx, ky, _) = rot.apply(&k);
-
-                let pg = Polygon(
-                    Coordinates(vec!( Coordinate(to_i32(ix), to_i32(iy))
-                                    , Coordinate(to_i32(jx), to_i32(jy))
-                                    , Coordinate(to_i32(kx), to_i32(ky)) )));
-
-                canvas.clear();
-                canvas.draw(&pg, Coordinate(75,75));
-                canvas.show();
-                deg = (deg + 3) % 359;
-            },
+            _ => {},
         }
     }
 }