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Ellipses and Ellipse arcs

May 20, 2011

Drawing ellipses

The default method for drawing an ellipse is to specify the endpoints of one axis of the ellipse, and then specify a distance representing half the length of the second axis. The endpoints of the first axis determine the orientation of the ellipse. The longer axis of the ellipse is called the major axis, and the shorter one is the minor axis. The order in which you define the axes does not matter. The program determines the major and minor axes based on their relative lengths. You can draw ellipses using any of the following methods:

• Center

• Axis, End

To draw an ellipse by specifying the axis and endpoints

1. Choose Draw > Ellipse >Axis, End.

2. Specify the first endpoint.

3. Specify the second endpoint.

4. Drag the pointing device away from the midpoint, and click to specify a distance for half the length of the second axis.

Draw toolbar

Command line ELLIPSE

 First axis endpoint (A), second axis endpoint (B), and half-length of other axis (C)

Drawing elliptical arcs

An elliptical arc is a portion of an ellipse. The default method for drawing an elliptical arc is to specify the endpoints of one axis of the ellipse, and then specify a distance representing half the length of the second axis. Then you specify the start and end angles for the arc, measured from the center of the ellipse in relation to its major axis.

To draw an elliptical arc by specifying the axis endpoints

1. Choose Draw > Ellipse > Arc.

2. Specify the first endpoint.

3. Specify the second endpoint.

4. Specify the half length of the other axis.

5. Specify the start angle of the arc.

6. Specify the end angle.

Draw toolbar

Command line ELLIPSE

NOTE ZWCAD draws elliptical arcs in the direction you specify. Go to Format >Drawing Units, under angle tab, the default setting is counterclockwise.

 First axis endpoint (A), second axis endpoint (B), half length of other axis (C), start angle of arc (D), and end angle (E)

Commands Reference

ELLIPSE: Creates an ellipse or an elliptical arc

System Variables Reference

ANGDIR: Sets the direction of positive angles

PELLIPSE: Controls the ellipse type created with ELLIPSE

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