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An Ellipse allows
you to define an elliptical or circular boundary. The boundary may behave like
a hard wall and be resistive to your push, or it may be magnetic and pull your
hand and device's cursor into the Ellipse. It's possible to use an Ellipse to
create a circle with a grooved edge or keep a user's cursor outside of a button.
Ellipses may also enclose other effects and give them an elliptical shape.

An Ellipse is defined
by a curved boundary which separates the Ellipse's inside from its outside.
The Ellipse has an inside wall lining the inside of the effect boundary, and
an outside wall lining the outside of the boundary.

All features of
Ellipses are available on the full force feedback mouse. Some tactile feedback
mice can emulate an Ellipse by playing a bump every time the cursor crosses
an Ellipse boundary, but the effect will not have the attractive properties
and impenetrability of the same effect played on a full
force feedback mouse. The Ellipse effect is not supported on joysticks,
wheels, or gamepads.

In general, an
Ellipse is a curved version of an Enclosure, and as such, its properties match
or closely parallel the same properties of an Enclosure effect.

**Center**

The Center is
the center point of the Ellipse.

**Direction**

The direction
of an Ellipse is the effect's angle of rotation. You can specify the direction
in either Cartesian or polar coordinates. The angle of the rotation is that
swept out between the Y-axis and the Ellipse's vertical axis.

To determine
the direction in Cartesian coordinates, place the center of the Ellipse at
the origin of the graph. Pick any point along the Ellipse's vertical axis
and determine its coordinates.

To determine
the angle in polar coordinates, place the center of the Ellipse at the origin
of the graph. Determine the angle from the Y-axis to the Ellipse's vertical
axis.

**Rectangle**

This property
allows you to specify the bounding rectangle for the effect, i.e. the rectangle
which exactly contains the Ellipse boundary. The top left corner of the Rectangle
is a location in absolute screen coordinates, in pixels, and the Rectangle
width and height are also in pixels.

**Thickness**

The thickness
of the Ellipse wall is measured at the widest part of the wall.

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