Constructor:Working with the screen
- Commands for organzing work on the screen
- Work modes for graded nest of pieces
- Scaling of pieces on the screen
- Screen organization
- Graded pieces
- Screen movements of pieces (shifts, rotations, folding, etc)
- Creating groups of superposed pieces
- Working with groups of lines
- Visibility of different piece elements on the screen
- Working with coordinate axes
- Functions, which service performance of all commands
Actions with pieces on the screen (scaling, moving on the screen, superposition, rotations) are called screen actions, since they are performed only on the screen and do not change information about a piece in the computer memory.
Aside from screen, temporary actions with pieces, the screen functions menu also contains service commands (clearing the screen, cancel selection) as well as important commands for organizing work: opening and deleting pieces from the screen, saving pieces, cancel action.
Screen menu functions are displayed on the vertical button menu in the left part of the working window, as well as in the tab WINDOW of the program text menu:
Some screen actions with pieces is located at the lower panel of the working window:
Work with «Grading table» 
and in the window «Graded nest control» 
is described separately.
