5.1.1

Chapter 5 User interface controls 129
The most common coordinate control is the Position parameter, which places the center
point for an object at a given position in the Canvas. But coordinate controls are used for any
parameter that denes a position in the Canvas—the center of a lens are or the origin of a
particle system, for example.
Additionally, most coordinate parameters can be set by moving an object or onscreen control
in the Canvas. For example, the Center parameter of the Radial Blur lter exposes a coordinate
control in the Canvas that you can drag to adjust the epicenter of this eect visually.
Modify a coordinate value in the inspector
m Use the value sliders for the X, Y, and (when applicable) Z axes.
m If a coordinate onscreen control is visible in the Canvas, drag it to another location.
For more information on using value sliders, see Value slider on page 12 8 .
Dial
Parameters measured in degrees (such as Rotation or Hue) employ the dial control.
Some parameters are limited to a value between 0 and 360 degrees. If you rotate such a dial
more than one revolution, the numbers repeat. Other parameters can be set to negative values
or multiple rotations.
Dials have a value slider beside them to indicate the value set by the dial. Dial value sliders can
be manipulated directly as well.
Adjust a parameter using a dial
Do one of the following:
m Drag the dial in a clockwise or counterclockwise direction to increase or decrease the value.
m Adjust the value slider to the right of the dial.
For more information on working with value sliders, see Value slider on page 128 .
Value eld
This control allows direct entry of text to set the value of the parameter.
An example of a parameter that uses a value eld is the text-entry eld. Motion also uses numeric
value elds.
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