Represents a encoded triangle using ShapeField.decodeTriangle.
type of triangle
represent if edge ab belongs to original shape
x coordinate, vertex one
y coordinate, vertex one
represent if edge bc belongs to original shape
x coordinate, vertex two
y coordinate, vertex two
represent if edge ca belongs to original shape
x coordinate, vertex three
y coordinate, vertex three
triangle type
Sets the values of the DecodedTriangle
pretty print the triangle vertices