Raster snap

Raster snap

Raster snap allows creating and editing objects, based on the geometry of other raster objects. For example, draw a line, the end point of which coincides with another raster line end point, or stretch an arc so that its end point is placed on a characteristic point of raster line.
Raster snap can only be performed on monochrome image. The raster snap operation looks the same as with vectors. When selecting points on the image with raster snap mode on, a square raster snap pickbox appears on the cursor cross. When placing this pickbox on the object, the program finds an appropriate point on the object for the specified snap mode, and transfers the calculated coordinates to the current command. If there are several possible snap points, then the closest one to the point specified is chosen.
The program highlights the point to which the snap is supposed to be made with a colour marker. Holding the cursor over the object displays a tooltip with the current snap mode name at the point. For each snap type a special marker is used. If there is any problem with precise snapping, then zoom the image on the screen.
 Note that the snapping function only operates effectively in the neighbourhood of the rubberline end, hence if it fails to recognize a raster entity, it considers it as a part of a polyline and tries to snap to the endpoints and midpoints of “polyline segments”.