The LassoUI Class
This class is useful if you’re implementing a custom selection mode or a real-time lasso selection. It implements the lasso dots seen in InkOverlay and Windows Journal.
To use the LassoUI class, create an instance using the new operator, call the Start method with the initial starting point of the lasso, and then repeatedly call the Continue method for subsequent points of the lasso. No calculation is required to measure distance or drop points to achieve the evenly spaced lasso dots—the class handles this automatically. To obtain the array of points constituting the lasso, query the Points property.
public void Start(Graphics g, Point ptStart)
This method indicates the start of a lasso, ...