Once again we are going to make another A, this time even better. This time we
aren't going to use the mouse to pick the points. Instead we will just type them into the
point entry field. Remove any existing lines.
Start the line making function again. It does not matter if the grid snap is or off, since you will type the values in to the fields. The grid snap is not considered when typing in values. The first line is created with these points: -1,-2,0 then 0,2,0. This means for the first point x is -1, y is -2, z is 0. It is not necessary to give the value for z. It will be assumed to be 0 if left off. The commas are also optional, but there must at least be a space between the numbers. So to enter the first point, type -1 -2, and hit enter. The focus moves to the next point and a little "blip" is put down to indicate where the point you have entered is. Now type 0,2 and hit enter again, completing the first line.
The points of the second line are -0.5,0,0 and 0.5,0,0. For the purpose of exploring the way the sequential dialogs work, this time just type in the first point and don't hit enter. Instead, just press the mouse in the second point field. Notice that when you do this the blip for the first point appears, as if you had hit enter in the first field. In general removing the focus from a data entry field should have this effect. Type in the second point. And this time, instead of hitting enter, hit the dialog's OK button, completing the second line.
The points of the last line are 1,-2,0 and 0,2,0. Type in the first point, and don't hit enter. Just hit the OK button now. The dialog box will not go away, because the the second point has not been specified. Rather, the focus is moved to the second field. The OK button in these sequential input dialogs really just moves the input to the next field or finishes the function if its on the last field. Enter the second point, completing the figure.