Operation Manual

36 Lines, Curves and Shapes
control point, you will get a sharp corner but not a straight line or a
curve. If you clamp two adjacent control points, you'll get a perfect
straight line between them. You can hold the Shift key if you want to
select and clamp multiple control points concurrently.
To use clamping:
1.
With the curve or shape selected, on the Drawing toolbar, select
the B-Spline Tool.
2. Select the control points you require.
3. On the context toolbar, click
Clamp Curve to clamp, or
Unclamp Curve to unclamp any control points.
Editing B-splines
You can edit your B-spline curve by manipulating its control points in a
similar way that you would when moving nodes around after having
drawn a line or a shape with the Pen or Pencil Tool.
To edit a B-spline:
1.
With the curve or shape selected, on the Drawing toolbar, select
the B-Spline Tool.
2. Select a control point.
3. Drag the control point into a new position. The control polygon
gives you a preview of how the curve will change as you drag.
Other editing options available are creating sharp corners or straight
lines within your shape or curve, and also converting a B-spline to a
Bézier.