Draw Ellipse

Function Description

The Ellipse command is used to create an ellipse. The application provides two ways to draw an ellipse: one is to draw the inscribed ellipse of a rectangle, and the other is to draw an oblique ellipse through the major and minor axes.

Function Entry

  • Edit Data tab -> Object Drawing group -> Polygon drop-down menu -> Ellipse.

Operation Instructions

Inscribed Ellipse of a Rectangle
  1. In the Edit Data tab's Object Drawing group, click the Polygon drop-down button, select the Inscribed Ellipse option, and the ellipse cursor appears.
  2. Move the mouse to the map, and you can see that as the mouse moves, the subsequent parameter input box will display the coordinates of that point in real time. In the parameter input box, enter the start point coordinates of the ellipse (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the start position of the ellipse.
  3. Move the mouse, and you can see the blue temporary ellipse changing size as the mouse moves. As the mouse moves, the width and height of the rectangle are displayed in real time. In the subsequent parameter input box, input the parameter values and press Enter to confirm the position of the ellipse.
  4. Right-click to cancel the current drawing operation.

Draw Oblique Ellipse

  1. In the Edit Data tab's Object Drawing group, click the Polygon drop-down button, select the Oblique Ellipse option, and the ellipse cursor appears.
  2. Move the mouse to the map, and you can see that as the mouse moves, the subsequent parameter input box will display the coordinates of that point in real time. In the parameter input box, enter the start point coordinates of one semi-axis (major or minor) of the oblique ellipse (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the start position of the semi-axis, i.e., the center of the ellipse.
  3. Move the mouse, and the map will display in real time the length of the line connecting the mouse position and the start point of the semi-axis, and the angle between it and the positive X-axis (you can switch between the two parameter input boxes by pressing the Tab key). In the parameter input box, enter the length and angle values, and press Enter to complete the drawing of one semi-axis of the oblique ellipse.
  4. Continue moving the mouse, and the map will display in real time the length of the line connecting the other semi-axis of the oblique ellipse and the start point of the semi-axis (determined in the previous step). Enter the length of the semi-axis in the parameter input box and press Enter to complete drawing the oblique ellipse.
  5. Right-click to cancel the current drawing operation.
Notes:

In a line dataset, ellipses drawn are ordinary line objects, only recording the coordinates of each node on the line. However, in a CAD dataset, the drawn ellipses are parametric objects, which record corresponding parameters such as the center, major axis, and minor axis.