Function Description

Split lines or regions by drawing a temporary splitting polygon.

The Polygon Split button is available only when there is at least one editable layer in the current map and one or more objects are selected in that layer.

When multi-layer editing is enabled, the temporary splitting polygon will split all selected lines or regions in all editable layers that the polygon passes through, even if those objects are located on different layers.

Function Entry

• Edit Data Tab -> Object Editing Group -> General Editing -> Split -> Polygon Split

Operation Instructions

1. Set the layer that contains the lines or regions to be split in the map to an editable state.
2. Click to select the line or region to be split. Alternatively, use box selection or hold down the Shift key to select multiple geometries.
3. On the Edit Data tab, in the General Editing drop-down menu, click the Polygon Split button in the Split group to start the polygon split operation. At this point, the current map's operation state changes to polygon split (splitting lines or regions).
4. Draw the temporary splitting polygon. Specifically: move the mouse on the map to draw the splitting polygon. Click the left mouse button at the appropriate position to determine the first vertex of the splitting polygon. Move the mouse; a temporary line segment that changes as the mouse moves appears. Click the left mouse button at the appropriate position to determine the next vertex. Continue clicking to draw other vertices of the temporary splitting polygon.
5. After finishing drawing the temporary splitting polygon, right-click to end the drawing. The splitting operation is then executed, and the temporary splitting polygon disappears.
6. The splitting result: all selected lines or regions in editable layers that the temporary splitting polygon passes through are split into separate objects at the intersections with the splitting polygon.
7. To continue the next polygon split operation, repeat step 4 above. To add lines or regions from other data for splitting, add the data, set the corresponding layer to editable, and then repeat step 4 above.
8. To cancel the polygon split operation, simply click the Polygon Split button again so that it is no longer pressed.

Polygon Split Operation Diagram:

Cross-Layer Splitting

Notes:

• When multi-layer editing is enabled, users can polygon split lines or regions in multiple editable layers simultaneously.
• Parametric objects do not support polygon split, such as circles, arcs, ellipses, etc.