Draw Arc

Function Description

To draw an arc, you can determine the center, endpoint, starting point, radius, angle and other parameters. You can create arcs (or elliptical arcs) in a variety of ways. Application provides three common ways to draw arcs: regular arc, three-point arc, and elliptical arc.

Function entrance

  • Object Operation tab-> Object Drawing group-> Line drop-down box-> Arc.

Operating instructions

Draw an arc by specifying three points (three-point arc)

  1. With the current layer editable, on the Object Operation tab, in the Object Drawing group, click the Line Drop-down Button and select the Three-point Arc option. The three-point arc cursor appears.
  2. Move Stop by Mouse to Map, and you can see that with the movement of the mouse in Map, the current coordinate value will be displayed in the parameter box in real time. Enter the coordinate value of a point on the three-point arc in the Parameter Settings box (you can switch between the two Parameter Input boxes by pressing the Tab key) and then press the Enter key to determine the starting position of the three-point arc.
  3. Move the mouse again, enter the coordinates of the second point in the Parameter Input box, and press Enter to confirm.
  4. Continue to move the mouse, enter the coordinate value of the last point in the Parameter Input box, and press Enter to complete the drawing of the three-point arc.
  5. Right-click to cancel the current drawing operation.

Draws an arc (regular arc) by specifying a start point, center point, and angle
  1. On the Object Operation tab, in the Object Drawing group, click the Line Drop-down Button and select the Regular Arc option. The regular arc cursor appears.
  2. Move Stop by Mouse to Map, and you can see that the Parameter Input box will display the coordinate value of the point in real time as the mouse moves. Enter the coordinate value of the starting point in the Parameter Input box (you can switch between the two Parameter Input boxes by pressing the Tab key), and then press the Enter key to determine the center of the circle.
  3. Move the mouse again and enter the radius (length) of the circle in the following Parameter Input box, and press Enter to draw a circle.
  4. Take the drawn circle as a reference, move the mouse, and enter Start Angle in the Parameter Input box (Start Angle is the angle between the positive direction of the X axis and the counterclockwise direction of the starting radius of the arc) to determine the starting position of the arc.
  5. After determining the Start Angle of the arc, continue to move the mouse, enter the angle swept by the arc in the Parameter Input box, and press Enter to draw an arc.

Draw an elliptical arc

  1. With the current layer editable, on the Object Operation tab, in the Object Drawing group, click the Line Drop-down Button and select the Elliptical Arc command. The elliptical arc cursor appears.
  2. Move the mouse, enter the starting point coordinates of a semi-axis (long semi-axis or short semi-axis) of the oblique ellipse in the Parameter Input box (you can switch between the two Parameter Input boxes by pressing the Tab key), and then press the Enter key to determine the starting position of the semi-axis of the oblique ellipse.
  3. Move the mouse, Map will mark the length of the line connecting the mouse position and the starting point of the semi-axis and the included angle between the line and the positive direction of the X axis in real time, input the length and angle values in the Parameter Input box (you can switch between the two Parameter Input boxes by pressing the Tab key), and press the Enter key to execute the input. Complete the drawing of one half axis of the oblique ellipse.
  4. Continue to move the mouse, type the length of another half axis in the Parameter Input box, and press Enter to complete the drawing of the oblique ellipse.
  5. Move the mouse and enter Start Angle in the Parameter Input box (Start Angle is the angle between the positive direction of the X axis and the counterclockwise direction of the starting radius of the arc) to determine the starting position of the elliptical arc.
  6. Continue to move the mouse, enter the angle swept by the elliptical arc in the Parameter Input box, and press Enter to draw an elliptical arc.
Caution:
The arc drawn in

Online Data is a common line object, and only the coordinates of each node on the line are recorded. However, the arc drawn in CAD Dataset is a parametric object, and the corresponding parameters, such as radius and center,

are recorded.