Endpoint snapping. Endpoints include the starting point of a line, the top, bottom, left, and right endpoints of a circle, etc.

Midpoint snapping of entities. For example, snapping to the midpoint of a line segment.

Snapping to the nearest point on an entity relative to the mouse position. This allows movement along the entity.

Snapping to the intersection points of multiple entities, such as the intersection of two line segments.

Snapping to the center point of an entity (or the center of a circle).

Entity drawing operation. After selecting a current point, subsequent points can only move in the orthogonal direction (vertical or horizontal) from the current point.