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• B-Spline: B-Splines are manipulated using only points—there are no tangent handles.
The points themselves do not lie on the surface of the shape. Instead, each B-Spline
control point is offset from the shape’s surface, magnetically pulling that section of the
shape toward itself to create a curve. B-Splines are extremely smooth—by default, there
are no sharp angles in B-Spline shapes, although you can create sharper curves, if
necessary.
Note: For more information about working with B-Spline curves, see Editing B-Spline
Control Points.
Radius: When Circle is the defined path shape, this slider allows you to change the size
of the circular path. Click the disclosure triangle to individually adjust the X radius and Y
radius.
Note: When the Motion Path behavior is selected, you can also use the onscreen control
points to resize the circle. Press Shift to resize the X and Y radii uniformly.
Size: When Rectangle is the defined path shape, this slider allows you to change the size
of the rectangular path. Click the disclosure triangle to individually adjust the X scale and
Y scale.
Note: When the Motion Path behavior is selected, you can also use the onscreen control
points to resize the rectangle. Press Shift to resize the X and Y scales uniformly.
Offset: When Circle, Rectangle, or Geometry is the defined path shape, this slider lets
you specify where the object starts moving on the path.
End Points: When Wave is the defined path shape, this control sets the location of two
default points on the wave’s path. The end points can also be adjusted using the wave’s
onscreen controls (active by default when the Motion Path behavior is selected). Moving
the left end point moves the entire path; moving the right end point lengthens, shortens,
or angles the path.
Amplitude: When Wave is the defined path shape, this slider defines half the distance
from the highest point to the lowest point in the wave. Higher values result in more
extreme waves.
Frequency: When Wave is the defined path shape, this slider sets the number of waves.
Higher values result in more waves.
Phase: When Wave is the defined path shape, this dial defines the degrees of the offset
of the waves from the start and end points of the path. When set to 0 degrees (default),
the wave begins and ends at half the distance from the highest point to the lowest point
in the wave. When set to 90 degrees, the wave begins and ends at the highest point in
the wave. When set to –90 degrees, the wave begins at the lowest point in the wave.
When set to 180 degrees, the waves are the same as 0 degrees, but inverted.
404 Chapter 9 Using Behaviors