Go backward to Grid snapping
Go up to Snapping
Go forward to Directional snapping
Context snapping
When context snapping is enabled, certain feature in the objects
of your current drawing become magnetic. There are three buttons to
enable three different features of your objects: vertices, the boundary,
and intersection points.
When the
mouse is too far away from the nearest interesting feature, the mouse
position will not be "snapped". The threshold can be changed by
moving the Snap distance slider in the configuration
panel. If you use a high setting, you will
need to toggle snapping on and off during drawing. Some people prefer
to set snapping on once and for all, and to set the snap distance to a
very small value like 3 or 4.
The features that you can make "magnetic" are the following:
- vertices
- are vertices of polygonal objects, control points of
multiplicity three of splines, centers of circles and ellipses,
centers and end points of circular arcs, and mark positions. Vertex
snapping is turned on by pressing the button labeled with a period.
The period looks like a point or vertex.
- boundaries
- are the object boundaries of polygonal objects,
splines and splinegons, circles and ellipses, and circular arcs.
Boundary snapping is enabled by pressing the /-button. Note
that the / character resembles a line segment, the boundary of
a polygonal object.
- intersections
- are the intersection points between edges of
polygonal objects, circles, or circular arcs. Note that intersection
points involving splines or ellipses are not recognized.
Intersection snapping is turned on with the x-button. The
letter x looks like the intersection of two lines.
When you are creating or editing a polygonal or spline object, you
sometimes want to be able to snap to the already present vertices or
control points of the object you are working on. This can be achieved by
pressing the button self in the Snap field. Note that this
only concerns vertices (and, unlike normal vertex snapping, the control
points of a spline are now magnetic as well), not the boundary curve or
intersection points.