5

Each B-Spline control point tugs on a section of the shape, pulling it toward itself. As a
result, you manipulate a shape’s curve by moving its control points in the direction you
want to pull the shape. For example, notice how every control point creating the S curve
below is offset in the direction of the curve it influences.
Note: You can show and hide the B-Spline frame lines that enclose B-Spline control points
by choosing View > Overlays > Lines.
By default, B-Spline shapes have no corners. Although this is the default behavior, you
can adjust the amount of curvature at each B-Spline control point. This allows you to
create sharper curves using fewer control points, even creating corners at a single point,
if necessary.
The easiest way to adjust B-Spline point curvature is by Command-dragging the control
point. You can also switch among three preset degrees of curvature.
To adjust B-Spline control point curvature
Do one of the following:
µ
Command-drag selected B-Spline control points to make their curves progressively sharper.
A handle appears indicating the curvature adjustment you’re making.
• Dragging away from the point makes the curve progressively sharper.
1144 Chapter 20 Using Shapes, Masks, and Paint Strokes