Snaps the vertex to add to the closest point over a line segment
By selecting the Snap to Line button on the Modes Toolbar, you're instructing uDig to search for the closest point over a line segment the lies inside the Snap Area, each time you click over the map, and to add a vertex at that location.
Whether you can select snap to vertex from a Feature in the current Layer, in all Layers, or in the Grid, depends on the Snap Behaviour set as preference.
Figure 1 shows an example of using the Snap Area to snap to a segment in a Feature from another Layer.
Figure 1 Using Snap Area to search for the "snap to" segment
Once you click over the map and a segment that intersects the Snap Area is found, a new vertex will be added on the location over the segment found closest to the click point, as shown in Figure 2.
Figure 2 vertex added snapped to the closest point over the segment
![]() | Tip When using the Snap Area behaviour, remember you could adjust the size of the snap area with the mouse wheel while pressing the ALT key. |