- _scale *= pow(3.0/2.0, -steps);
- _scale = max(min(_scale, MaxScale), MinScale);
- _offset = cursor_offset - _scale * offset;
-
- _ruler->update();
- _viewport->update();
- update_scroll();
+ const double new_scale = max(min(_scale * pow(3.0/2.0, -steps),
+ MaxScale), MinScale);
+ const double new_offset = cursor_offset - new_scale * offset;
+ set_scale_offset(new_scale, new_offset);