Compute a flow line

• You can adjust the line parameters. Press the ``parameters'' button in the ``LINE'' frame, a window appears (see figure 1.43) :
  $\bullet$ ``ll'' is the maximum number of points on a flow line.
  $\bullet$ ``step'' between 2 points on a flow line.

  You can ``Set'' new values, ``save'' them in in a file (the default name is ``line_param.flow''), ``reset'' to the initial values or ``restore'' the saved parameters.

  Figure 1.43: Flow line parameters.

  

• Push the ``create'' button in the ``LINE'' frame of the working window to compute a flow line. Some messages appear if no point has been chosen or if it is out of the mesh, or if the number of points on the flow line is under the chosen parameters.
• You can ``save'' a flow line, then set the toggle ``lines'' on to redraw the saved flow lines in the drawing area. .
• You can use the ``draw'' button in the ``LINE'' frame to select which saved lines will be drawn.

A example of flow lines is shown on figure 1.44.

Figure 1.44: A flow line.