message: fix rotation direction after decomposed.
diff: @@ -172,7 +172,8 @@ class Transformable {
  sy = Math.sqrt(sy);
  }
  - this.rotation = Math.atan2(m[1] / sy, m[0] / sx);
  + // rotation is inversed in zrender.
  + this.rotation = Math.atan2(-m[1] / sy, m[0] / sx);
  if (m[0] < 0) {
  sx = -sx;
  