Draw an ellipse
This section describes how to draw ellipses. The figure illustrates the geometric points used to create an ellipse:
1. Major radius
2. Vertex
3. Angle between X-axis and major axis of ellipse
4. Minor radius
5. Major axis
6. Center of ellipse
7. Minor axis
There are three methods for drawing an ellipse:
• To create an ellipse using two vertices and a peripheral point,
With this method, you need to define two opposite vertices of the ellipse and a point on the periphery of the ellipse.
1. Click
Geometry and then, in the
Draw group, click the arrow next to
Spline.
2. Click
Axis & Point in the
Ellipse section. The
Ellipse 2 Vert Pnt dialog box opens.
3. Click a point to define a vertex of the ellipse.
4. Click the point at the opposite vertex of the ellipse.
5. Click a point on the periphery of the ellipse.
6. Continue creating ellipses with this method, or click
to complete the operation.
• Create an ellipse using the center, an angle, and two radii
With this method, you need to define the following:
◦ Center of the ellipse
◦ Angle between the x-axis and the major axis of the ellipse
◦ Minor radius of the ellipse
◦ Major radius of the ellipse
1. Click
Geometry and then, in the
Draw group, click the arrow next to
Spline.
2. Click
Center, Angle & Radius in the
Ellipse section. The
Ctr Ang R dialog box opens.
3. Click a point to define the center of the ellipse.
4. Type the angle value between the X-axis and the major axis of the ellipse in the user input line and press the Enter key.
5. Type the major radius of the ellipse and press the Enter key.
6. Type the value for the minor radius of the ellipse and press the Enter key.
7. Continue creating ellipses with this method, or click
to complete the operation.
• Create an ellipse using the center and two peripheral points
With this method, you need to define the center of the ellipse and two points on the periphery of the ellipse.
1. Click
Geometry and then, in the
Draw group, click the arrow next to
Spline.
2. Click
Center & 2 Points in the
Ellipse section. The
Ellipse Ctr Pnts dialog box opens.
3. Click a point where you want the center of the ellipse.
4. Click a point on the periphery of the ellipse.
5. Click a second point on the periphery of the ellipse.
6. Continue creating ellipses with this method, or click
to complete the operation.
