The Intelligent Snap Mode is activated by clicking the fourth
button (two intersecting lines) in the icon header.
The icon turns green after clicking. The snap symbols support
the input of points considerably and thus represent a design
aid, which facilitates the construction process.
The snap symbols appear on the graphic screen, whenever the current
CAD command awaits the input of a point and an element (e.g.
straight line or circle) is touched with the mouse. Inside a blue
circle it is symbolically shown, which point is snapped after
pressing the respective mouse button.