JoinType

Delphi type TJoinType = (jtSquare, jtRound, jtMiter);

C++ enum JoinType {Square, Round, Miter};

C# public enum JoinType {Square, Round, Miter};

The JoinType enumerator is only needed when offsetting (inflating/shrinking). It isn't needed for polygon clipping.

When adding paths to a ClipperOffset object via the AddPaths method, the joinType parameter may be any one of these types - Square, Round or Miter.

The angle at vertex A is more acute than the one at B and a mitered offset there would exceed 'miter limit'.

JoinType.Square: Squaring is applied uniformally at all joins where the internal join angle is less that 90 degrees. The squared edge will be at exactly the offset distance from the join vertex.
JoinType.Round: Rounding is applied to all joins that have convex external angles, and it maintains the exact offset distance from the join vertex.
JoinType.Miter: There's a necessary limit to mitered joins (to avoid narrow angled joins producing excessively long and narrow spikes). So where mitered joins would exceed a given maximum miter distance (relative to the offset distance), these are 'squared' instead.

JoinType

See Also