octave: Interacting with Plots
15.2.10 Interacting with Plots
------------------------------
The user can select points on a plot with the ‘ginput’ function or
select the position at which to place text on the plot with the ‘gtext’
function using the mouse.
-- : [X, Y, BUTTONS] = ginput (N)
-- : [X, Y, BUTTONS] = ginput ()
Return the position and type of mouse button clicks and/or key
strokes in the current figure window.
If N is defined, then capture N events before returning. When N is
not defined ‘ginput’ will loop until the return key <RET> is
pressed.
The return values X, Y are the coordinates where the mouse was
clicked in the units of the current axes. The return value BUTTON
is 1, 2, or 3 for the left, middle, or right button. If a key is
pressed the ASCII value is returned in BUTTON.
Implementation Note: ‘ginput’ is intenteded for 2-D plots. For 3-D
plots see the CURRENTPOINT property of the current axes which can
be transformed with knowledge of the current ‘view’ into data
units.
DONTPRINTYET See also: 
gtext XREFgtext, *notewaitforbuttonpress:
DONTPRINTYET See also: gtext XREFgtext, waitforbuttonpress
XREFwaitforbuttonpress.
-- : waitforbuttonpress ()
-- : B = waitforbuttonpress ()
Wait for mouse click or key press over the current figure window.
The return value of B is 0 if a mouse button was pressed or 1 if a
key was pressed.
See also: waitfor XREFwaitfor, ginput XREFginput,
kbhit XREFkbhit.
-- : gtext (S)
-- : gtext ({S1, S2, ...})
-- : gtext ({S1; S2; ...})
-- : gtext (..., PROP, VAL, ...)
-- : H = gtext (...)
Place text on the current figure using the mouse.
The text is defined by the string S. If S is a cell string
organized as a row vector then each string of the cell array is
written to a separate line. If S is organized as a column vector
then one string element of the cell array is placed for every mouse
click.
Optional property/value pairs are passed directly to the underlying
text objects.
The optional return value H is a graphics handle to the created
text object(s).
See also: ginput XREFginput, text XREFtext.
More sophisticated user interaction mechanisms can be obtained using
the ui* family of functions, UI Elements.
Info Catalog
octave: Printing and Saving Plots
octave: High-Level Plotting
octave: Test Plotting Functions