| Name | Description |
|---|---|
| Command | |
| LineTool | tool used to draw line |
| Matrix4 | Matrix used to transform between ucs coordinate and world coordinate. |
| TrussForm | window form contains one three picture box to show the profile of truss geometry and profile and tabControl. User can create truss, edit profile of truss and change type of truss members. |
| TrussGeometry | TrussGeometry class contains Geometry information of new created Truss, and contains methods used to Edit profile of truss. |
| Vector4 | Vector4 is a homogeneous coordinate class used to store vector and contain method to handle the vector |