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Max Tilt: Adjusts the maximum threshold of tilt sensitivity. Tilt values above the maximum
value are remapped to 1. For Opacity, Width, Spacing, Angle, and Jitter, those values will
have the greatest effect. If the Min and Max tilt are plotted on a graph, Max Tilt represents
the maximum value, or 1. The area of the graph between Min and Max is remapped to
the output values.
Scale: Determines the magnitude of the effect. Defines the output range for the dabs
based on the mapped values between minimum (0) and maximum (1) tilt, multiplied by
the value defined in the slider (or value field). This amount is then applied to the parameter
(width, opacity, and so on) by multiplying (for width, opacity, spacing, and jitter) or adding
(for angle). This control is independent of the Scale parameter in the Stroke pane.
Invert: This checkbox inverts the attributes of the stroke created by the behavior. For
example, if pen tilt is set to affect the width of the stroke, thin areas of the stroke become
wide and wide areas become thin when the checkbox is selected.
HUD Controls
The parameters in the HUD are identical to the parameters in the Inspector.
Oscillate Shape
The Oscillate Shape behavior animates a shape by cycling its control points between two
values. You can customize how wide apart the high and low values are, as well as the
number of oscillations per minute. This behavior is useful for creating fluid shape
movements (think shape yoga) that would be time-consuming to keyframe.
When the Oscillate Shape behavior is applied to a shape, all control points of the shape
are affected by default. When the behavior is selected in the Layers list, affected control
points are highlighted in white on the blue shape behavior spline. To disable control
points, click the control points. A disabled point appears blue.
Parameters in the Inspector
Wave Shape: A pop-up menu that lets you select the shape of the oscillation’s wave. The
options are Sine (default), Square, Sawtooth, and Triangle. For more information on wave
shapes, see Oscillate.
Phase: A slider that lets you adjust the point of the specified oscillation where the behavior
starts. This parameter allows you to put multiple shapes with identical Oscillate behaviors
out of phase with one another so they don’t all look the same.
Amplitude: A slider that lets you adjust the maximum values that the control points
oscillate between. The control point swings between the amplitude value, and the negative
of the amplitude value. Higher values result in more extreme swings from the beginning
to the ending of each oscillation.
Speed: A slider that lets you adjust the speed at which the oscillation occurs, in oscillations
per minute. Higher values result in faster oscillations.
1178 Chapter 20 Using Shapes, Masks, and Paint Strokes