Function Description

In the editable state, parts of a line or face object are updated with the drawn polyline. The Local Update function uses the portion of the polyline that intersects the source object (the line object to be updated) to form a new object.

• The Local update function is available for line, surface, and CAD layers.
• When the object to be updated is not selected, the starting point and ending point of the drawn polyline must be on the boundary of the object to be updated, so it is recommended to turn on the snap function during operation.
• If the object to be updated is selected, it can be updated by using Clip Mode, and the drawn polyline must have at least two intersections with the object to be updated.
• An object participate in a Local update can be a simple object or a single child of a complex object, but cannot be a Compound.
• In the Local update operation, the update result varies depending on the Object Type to be updated. Updating line and face objects is described in more detail below.
  • The object to be updated is an unselected line object (snap mode)

    As shown in the figure below, it is a schematic diagram of Local update of an unclosed and unselected line object.

    Figure 1 shows the line object to be updated. Use the polyline drawn in Figure 2 to update it. The starting and ending points of the polyline need to be on the line object. The highlighted and thickened line segment in Figure 2 is the result of Local update.

    The

    drawn update line segment divides the line object to be updated into three segments. After determining the starting and ending points of the updated polyline, if the keyboard shortcut Ctrl or shift is pressed, the Local update result can be switched, as shown in the highlighted and bolded line segment in Figure 3.

    to be updated

    Figure 1: Objects	Figure 2: Local update operation	Figure 3: Toggle Local update result

  • The object to be updated is the selected line object (crop mode)

    As shown in the figure below, it is a schematic diagram of Local update of an unclosed and selected line object.

    Figure 1 shows the line object to be updated. Use the polyline drawn in Figure 2 to update it. The polyline drawn has two or more intersections with the line object to be updated. The highlighted and thickened line segment in Figure 2 is the result of Local update.

    The

    drawn update line segment divides the line object to be updated into three segments. After determining the starting and ending points of the updated polyline, if the keyboard shortcut Ctrl or shift is pressed, the Local update result can be switched, as shown in the highlighted and bolded line segment in Figure 3.

    to be updated

    Figure 4: Objects	Figure 5: Local update operation	Figure 6: Toggle Local update result

  • The object to be updated is an unselected face object (snap mode)

    As shown in the following figure, it is a diagram of Local update with closed and unselected face objects.

    Make sure that the start and end points of the update polyline are on the boundary line of the face object. The preview effect of the update result is a blue area (Figure 8). At the same time, the boundary line of the update face object is highlighted and thickened. If the Ctrl or Shift key is pressed, the update result will be automatically switched, as shown in the blue area between the highlighted and thickened line segments in Figure 9.

    to be updated

    Figure 7: Closed face object	Figure 8: Local update results1	Figure 9: Local update result 2

  • Objects to be updated are in Select Objects (crop mode)

    As shown in the following figure, it is a Local update diagram of a closed and selected face object.

    The start and end points of the

    update polyline can be inside the boundary line of the face object or outside the boundary line, and the polyline drawn must have two or more intersections with the boundary line of the face object. The preview effect of the update result is a blue area (Figure 11). At the same time, the boundary line of the update face object is highlighted and thickened. If the Ctrl or Shift key is pressed, the update result will be automatically switched, as shown in the blue area between the highlighted and thickened lines in Figure 12.

    to be updated

    Figure 10: Closed face object	Figure 11: Local update result 1	Figure 12: Local update result 2

Function entrance

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

Operating instructions

1. Make Layer Settings editable in the Layer Manager.
2. On the Object Operation tab, in the Gallery controls in the Object Editing group, click the Local Update button to perform a local update operation. The polyline cursor appears in the Map.
3. Local update has two modes of operation, snap mode and crop mode. Whether the object to be updated is selected or not is different. If the object to be updated is not selected, it can only be updated in snap mode; if the object to be updated is selected, it can be updated in snap mode or crop mode.
   • Snap mode: Move the polyline cursor to the boundary of the line object or face object to be updated. The start and end points of the drawing must be on the boundary of the object to be updated. If they are not on the boundary, the Output Window will prompt: "Update in snap mode, the point needs to be on the line. To update in crop mode, Please select an object first. The starting point needs to be redrawn. If the starting point of the drawn polyline is snapped to the line, it must be in snap mode.
     Caution:

     To use the snap mode, you need to turn on the Point Snap on Line. function in Snap Settings.

   • Crop Mode: Select the object to be updated, and the starting point of drawing can be on the boundary of the object to be updated or not, but the polyline drawn must have two or more intersections with the boundary line of the line object or face object.
4. Continue drawing the polyline. The updated shape is automatically highlighted when the points drawn snap to the object to be updated. The polyline currently drawn divides the boundary of the object to be updated into segments. Press and hold the Ctrl key to toggle the selection of the boundary to be updated.
5. Click the right mouse button and confirm to update with the currently drawn shape to complete the Local update operation.