Draw Sector

Function Description

  • The Sector command is used to draw a sector object. The application provides two methods for drawing sectors: one obtains a circular sector by drawing a circle, and the other obtains an elliptical sector by drawing an ellipse.
  • The drawn sector object is part of a (elliptical) circle object, so before drawing a sector object, you need to first draw a (elliptical) circle object.

Function Entry

  • Features Tab -> Objects Group -> Polygon Drop-down Box -> Sector.

Operation Instructions

Circular Sector
  1. In the Objects group of the Features tab, click the Polygon drop-down button and select the Circular Sector command. The circular sector cursor appears.
  2. Move the mouse to the map, and then enter the coordinates of the circle's center in the subsequent parameter input boxes (you can press the Tab key to switch between the two parameter input boxes). Press Enter to confirm the center position.
  3. Move the mouse again and enter the radius (length) in the subsequent parameter input box. Press Enter to complete the circle drawing.
  4. Continue moving the mouse, enter the start angle for the sector in the parameter input box, and press Enter to confirm.
  5. Move the mouse, enter the sweep angle of the sector in the parameter input box, and press Enter to complete the drawing of the circular sector.
  6. Right-click to cancel the current drawing operation.

Elliptical Sector

  1. In the Objects group of the Features tab, click the Sector drop-down button and select the Elliptical Sector command. The sector cursor appears.
  2. Move the mouse to the map. You can see that the coordinates of the current mouse position are displayed in real-time in the subsequent parameter input boxes as the mouse moves. Enter the starting point coordinates of the ellipse in the parameter input boxes (you can press the Tab key to switch between the two parameter input boxes) and press Enter to confirm the ellipse's starting position.
  3. Move the mouse. The map will display in real-time the length of the line connecting the mouse position and the semi-axis starting point, as well as the angle between this line and the positive X-axis (you can press the Tab key to switch between the two parameter input boxes). Enter the length and angle values in the parameter input boxes, and press Enter to execute the input, completing the drawing of one semi-axis of the oblique ellipse.
  4. Continue moving the mouse, enter the length of the other semi-axis of the ellipse in the parameter input box, and press Enter to complete the drawing of the oblique ellipse.
  5. Continue moving the mouse, enter the start angle for the sector in the parameter input box, and press Enter to confirm.
  6. Move the mouse, enter the sweep angle of the sector in the parameter input box, and press Enter to complete the drawing of the elliptical sector.
  7. Right-click to cancel the current drawing operation.
Notes:

Sectors drawn in a line dataset are ordinary line objects, recording only the coordinates of each node on the line. However, sector objects drawn in a CAD dataset are parametric objects, recording corresponding parameters such as center point, major semi-axis, minor semi-axis, start angle, and sweep angle.