Title and axis legends must be part of the command(s) that generate
the graph or geometry window. For example, try this on a commandline
f(t):=sin(t);title="Graph of f on a period",labels=["t","f(t)"],legend=["cm","m"],plot(f(t),t=-pi..pi)
Controls are common to 2-d, 3-d and to graphic or geometry. You can move left, right, up and down the window, redefine it using coordinates, zoom in and out, pause and restart an animation. In 2-d, the coordinates of the mouse are displayed while it is in the graphic area. In 3-d, you can rotate the representation along the current x, y, z axis with a mouse drag outside of the scene rendering, or by hitting the x,X, y,Y and z,Z key (when the focus is the 3-d scene).
Note that the controls apply only to the visualization, not to the creation
of graphic objects. For example, if you create a plot of a function,
the discretisation parameters for this plot (e.g. minimal value for
x) are fixed and will not change if you move the minimal visualisation
value using the controls. You must recreate a graphical object if
you did not choose correctly the parameters. For example if you
run the command plot(sin(x))
, the minimal value for computation
of x will be the default value (Xmin from the Geo configuration). If
you move the minimal value of x for visualization below Xmin, you will
not see the plot there. To see the plot below Xmin, you would have
to specify something like ploy(sin(x),x=-20..0)
and validate
the commandline. This does not apply to point, line and circles which
will always be drawn if visible.