Function Description

In the Gallery controls of the Object Editing group on the Object Operation tab, there is a function to generate a round by extending or trimming the adjacent ends of two line segments to connect them with an arc tangent to both lines.

• The Round button is only available when two line segments are selected in an editable layer, that is, the function is only available for the two selected line segments.
• The object participating in the round must be a simple line object with one and only one point of intersection for its extension lines. If the two lines are parallel to each other or on the same line, the operation is not successful.
• When the operation is complete, the source line may be extended, trimmed, and the Attributes may not change.
• Although the cross line can be chamfered, there is no obvious scientific significance, so this situation is not described in detail.

Function entrance

• Object Operation tab-> Object Editing group drop-down box-> Round.

Operating instructions

1. Sets the Layer of Object of the segments to round to the Current Editable Layer.
2. Select two segment objects (non-parallel lines) in the layer at the same time.
3. In the Gallery control of the Object Editing group on the Object Operation tab, click the Fillet button to pop up the Fillet Settings dialog. The default fillet radius is one fifth of the maximum inscribed radius of the two segments. The units of the fillet radius are the same as the Unit of the Current Editable Layer.
4. Set the arc radius, that is, the radius of the arc tangent to both lines. The result of the round will determine the position and size of the round according to the arc radius set by the user, so that the two lines involved in the operation will be extended or clipped appropriately. With the modification of the arc radius, the preview image will display the results of the fillet operation in real time, which is convenient for the user to adjust.
5. Set whether to Trim Source Object. Check this box to indicate that the source object will be trimmed after the operation, otherwise the original object will be retained.
6. A preview of the resulting round is displayed in the Map in real time. Click the OK button to execute the operation of round generation according to the user's settings. The result is shown in the following figure.

   Figure: Round Result

7. Operation result description: The system calculates the inscribed circle with the input radius in the selected two lines, and finds the tangent points of the two lines on the inscribed circle. If the tangent point is on the line segment, it will be cut off; In On Extension Line, after the end point of the line segment is extended to the tangent point, the outer arc between the two tangent points is taken from the inscribed circle to generate a new line object, and its attribute record is added to the tail of the attribute table. System Field: The value is assigned by the system. Non-system Field: The value is null. While the original line object retains the original attributes. The operation results are illustrated as follows: of operation process and result

   Figure: Schematic diagram