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These are points, which are bound to a line, a circle, automatic
tracks, polygons, function graphs or parametric curves
(**bound points**). They will move in a continuous way, if the
containing object is moved. A point can be **release**d, and bound to
a new object at any time using its **properties** dialog.

Points can be bound on the perimeter of objects, or on the **inside**
of objects, if the object is a circle, an angle or a polygon. To
create a point inside an object, simply create an object on its
boundary, and edit the properties of the object, switching the
"inside" flag on. Alternatively, use the "bind to" button in the
dialog of any free point and press the **ctrl-key** when selecting the
object.

Bounded points are either created with the point tool by clicking on a
line or a similar object, or by a special tool. Moreover, any point
can be bound to an object later on using its **properties** dialog.
Exit the dialog with the button to bind the point, and then select the
object.

Points can be bound in two ways. Either the point is projected every
time the object moves, or the point is kept in its relative position
on the object. The **relative fix** can be removed or set in the
object editor. The relative fix is the default.

Bound points are not free. If however, a segment lies with both endpoints on a line, and one of them is a bound point (to the line), the segment can be fixed in its length. Normally, this is only possible, if the segment hat at least one free endpoint.

Related topics: Points, Lines and Rays, The Mouse, Object Properties

Next topic: Lines and Rays