Introduction - If you have any usage issues, please Google them yourself
I use Win API procedures for the preparation of the drawing board.
To carry out the basic graphics rendering functions: linear, circular, rectangular and polygonal
Data retention capabilities, be able to save vector graphics data to a file
Simple editing features: Double-click the selected ael use the keyboard keys and menu item to delete the selected graphic elements
Be able to save from the file to load data, and to carry out basic editing operations
Object can zoom in and out
Sketchpad can be moved around from top to bottom
If a computer running two instances, then a program in any operating procedure in the other can see the results of the same operation, that is, procedures for communication between functions.