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370 Chapter 5: Creating Geometry
areMakeSymmetrical,DisplayXAxis,DisplayY
Axis, Display XY Axes, and Swap Deform Curves.
Ma k e Sy mmetr ical—Yo u c a n a p p l y t h e s a m e
deformation to both axes of a shape using Make
Symmetrical, which is both an action button
and a curve editing mode. Turning on Make
Symmetr ical has the following effect:
• When a single curve is displayed, it copies the
displayed deformation curve to the curve for
the hidden axis.
• When both axes are displayed, the Apply
Symmetrydialogisalsodisplayed.Clickthe
button for the curve you wan t to apply to both
axes.
• Changes you make to the selected curve are
duplicated on the other curve.
When Make Symmetrical is not active, curve
editing is applied only to the selected curve.
Display X Ax is/Y Axis/XY Axes—Yo u c a n d i s p l a y
one or both deformation curves using the curve
display buttons near the upper-left corner of the
Deformation dialog.
Turn on the following buttons to display
deformation curves:
•
Display X Ax is—Displays only the X axis
deformation curve in red.
•
Display Y Ax is—Displays only the Y axis
deformation curve in green.
•
Display XY Axes—Displays X axis and Y axis
deformation curves together, each using its
own color .
Swap Deform Curves—Copies curves between the
X axis and Y a xis. This button has no effect when
Make Symmetrical is on.
Click Swap D eform Cur ves to copy the X axis
curve to the Y axis, and the Y axis curve to the X
axis. It doesn’t matter which curve is currently
displayed or selected.
Move Control Points—This flyout contains three
buttons for moving control points and Bezier
handles:
•
Move Control Point—Changes the amount
of deformation (vertical movement) and
the location of the deformation (horizontal
move ment).
•
Move Vertical—Changes the amount of
deformation without changing the location.
•
Move Horizontal—Changes the location of the
deformation without changing the amount.
If one control point is selected, you can move it by
entering values in the control point Position and
Amount fields at the bottom of the Deformation
dialog.
You cannot move end points horizontally.
Intermediate control points are constrained
horizontal ly to stay b etween t he points on either
side. The amount of horizontal constraint is
determined by the control point type.
• You can move corner control points very close
together, until one is directly ab ove the other.
• You can move Bezier control points no closer
than the length of their tangent handles.
Movi ng B ezier Tangent Handl es—You c a n u s e t h e
Move Control Point buttons to drag a tangent
handle’s angle and magnitude on Bezier Smooth
and Bezier C orner vertices.
Dragging a tangent handle has the following
constraints:
• You cannot move tangent angles beyond
vertical. This prevents deformation curves
from doubling back on themselves.
• You cannot move tangent m agnitudes beyond
the preceding or next con trol point on the path.
Pressing
Shif t while moving a B ezier Smooth
tangent handle converts the control point to a
Bezier Corner ty pe.