Drawing a Circle

Function Description

A circle can be created using various methods. It can be achieved by specifying the center and radius, diameter, points on the circumference, etc. The application provides five ways to draw a circle. The default method is to specify the center and radius.

Function Entrance

  • Features Tab->Objects Group->Polygon Drop-down List->Circle.

Operation Instructions

Drawing a Circle by Center and Radius
  1. In the Features tab's Objects group, click the Polygon drop-down button and select the Center, Radius button from the drop-down menu. The center and radius cursor appears.
  2. Move the mouse to the map. As the mouse moves, you can see the coordinate values of the current mouse position are displayed in real-time in the following parameter input box. In this parameter input box, enter the coordinate values for the center point (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the center.
  3. Move the mouse again and enter the radius (length) in the following parameter input box. Press Enter to complete the drawing.

Drawing a Circle by Diameter

  1. In the Features tab's Objects group, click the Polygon drop-down button and select the Starting Point, Diameter option. The circle cursor appears.
  2. Move the mouse to the map. As the mouse moves, you can see the coordinate values of the point are displayed in real-time in the following parameter input box. In this parameter input box, enter the coordinate values for the starting point of the diameter (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the starting point of the diameter.
  3. Move the mouse. You can see the length of the line connecting the mouse position and the diameter's starting point and the angle between this line and the positive direction of the X-axis are displayed in real-time on the map (you can switch between the two parameter input boxes by pressing the Tab key). Enter the length and angle values in the parameter input box.
  4. After confirming the diameter, press Enter to complete the circle drawing.

Drawing a Circle by Two Points on the Circumference

  1. In the Features tab's Objects group, click the Polygon drop-down button and select the 2 Points option. The circle cursor appears.
  2. Move the mouse to the map. As the mouse moves, you can see the coordinate values of the current mouse position are displayed in real-time in the following parameter input box. In this parameter input box, enter the coordinate values for a point on the circumference (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm a point on the circle.
  3. Move the mouse. As the mouse moves, enter the coordinate values for another point on the circumference in the following parameter input box (you can switch between the two parameter input boxes by pressing the Tab key).
  4. After pressing Enter, a circle object will be drawn using the distance between these two points on the circumference as the diameter.

Drawing a Circle by Three Points on the Circumference

  1. In the Features tab's Objects group, click the Polygon drop-down button and select the 3 Points option. The three-point circle cursor appears.
  2. Move the mouse to the map. As the mouse moves, you can see the coordinate values of the point are displayed in real-time in the following parameter input box. In this parameter input box, enter the coordinate values for the first point on the circumference (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the coordinates of the first point on the circle.
  3. Move the mouse. In the following parameter input box, enter the coordinate values for the second point on the circumference (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the coordinates of the second point on the circle.
  4. Move the mouse. In the following parameter input box, enter the coordinate values for the third point on the circumference (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to draw a circle passing through these three points.

Drawing the Circumcircle of a Rectangle

  1. In the Features tab's Objects group, click the Polygon drop-down button and select the Circumcircle of Rectangle option. The circumcircle of rectangle cursor appears.
  2. Move the mouse to the map. As the mouse moves, you can see the coordinate values of the point are displayed in real-time in the following parameter input box. In this parameter input box, enter the coordinate values for the starting point of the rectangle (you can switch between the two parameter input boxes by pressing the Tab key) and then press Enter to confirm the rectangle's starting position.
  3. Move the mouse. As the mouse moves, the parameter input box will display the rectangle's height and width in real-time (you can switch between the two parameter input boxes by pressing the Tab key). Type the rectangle's width and height in the parameter input box.
  4. After pressing Enter, the circumcircle of the rectangle determined in the previous step will be created.
Note:

Circles drawn in a line dataset are ordinary line objects, which only record the coordinates of each node on the line. However, circle objects drawn in a CAD dataset are parametric objects, which record corresponding parameters such as radius and center.