Loops and S-Curves

You don't have to draw curves one at a time.  Some constructs, like loops and S-curves, work better if you draw more than one circle before you add the straights.

To draw a loop:

1.  Draw two circles. Use the Circle tool  .  Remember: use the shift key to move, unshift to resize.
2.  Begin on either circle and drag a tangent to the other.
3.  Release when the destination circle is highlighted.
4.  Repeat the procedure on the other side of the loop.
5.  When you release the second tangent, both circles become curves, and the loop is complete.

To draw an S-curve:

1.  Draw two circles.  Leave a little space between them.
2.  Begin a tangent on the inside edge of one circle.
3.  Drag to the inside edge of the other circle.  Release when the destination circle is highlighted.
4.  Draw an outer tangent.  This completes one curve and removes one circle.
5.  Draw the other outer tangent.  This completes the other curve and removes the other circle.
6.  The completed S.