When you draw a shape,maybe,you'll draw some same style shapes.you can set the base style of TMyCAD setting before draw it.you can set Brush,Pen,Font properties of tcad first,then when you draw a new shape,it will be effective.

If you draw a line style,you can set ArrowAngle,ArrowLength,ArrowOffset,ArrowStyle properties besides above properties.

Also,you can do it by code.

Code example:

procedure TMainFrm.Button1Click(Sender: TObject);
begin
 //Draw a line
  MyCAD1.Pen.Color:=clGreen;
  MyCAD1.ArrowStyle:=ADouble;
  MyCAD1.ArrowOffset:=20;
 
  //...
end;