KernelCAD Documentation

Segment strip (or 2D Strip) is a chain of joined 2D Curved Segments. Segments in this product are either arcs or segments of straight lines. Arcs should not be longer than half of its full circle. Angles at segment joints should not be equal to 0 or 360 degrees.

Programmatically Segment strips can be created using call to the IObjectGenerator.Create method with eType parameter set to eObjTypeArcLineStrip. The method returns IStripArcLine_KC interface. Segment strips also implement IStrip and IStripTopol

A segment strip can be edited interactively in a 2D editor either by changing coordinates of joint points or changing properties of a segment. In this release a segment can have arc radius or arc curvature as its single property.

A strip can be extended with a new segment by using Add command available form the Command Page of the Form View.. This operation adds new straight segment to the selected end. If there are no ends a new point will be created.

To add a new internal segment to a strip use Break command. "Break" command divides the segment in two. To break a segment press Break button on Command page of the form and click the segment at point where you would like to break it.

Selected straight line can be changed to an arc and vice versa by using Change Class command available from the context menu. or the Command Page.

A segment strip is called closed if it a loop, i.e. it has no ends, so that the second end of the last segment is the first end of the first segment. We consider a loop valid if it has three or more segments. Closed strips have either Clockwise or Counter Clockwise (CW and CCW) orientation. For cross-sections of Generic 3D Objectss only CCW oriented loops are valid. For the case of Surface Of Revolution only loops with the opposite CW orientation are valid. To see orientation of a loop use "Strip Order" command available from context menu (right mouse click in the window).

Loops with self intersections are considered invalid. If this situation has happened accidentally, software in most cases will work, but covers of front and back edges will be automatically disabled. If you need them, correct the shape and switch correspondent check boxes in the "Current object" > Options dialog back on.

A strip which has a single point and no segments is considered valid. Strips like that are normally cross-sections of 3D lines. Empty strips (without any elements) are valid too. New points can be added to a strip using Add command.

Delete command, which is available from the Command Page deletes currently selected segment from the strip. Note that the edited strip is assumed to be always connected, that is why deleting a middle segment from a non-closed strip will not have any effect. This will not happen if you are deleting an end segment from a non-closed loop.

Close Loop command from the Command Page adds a new straight segment which joins ends of the current strip to make it closed. "Close loop" command does not have any effect for strips which consist of a single segment.