(octave.info)Contour Groups

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15.4.6.4 Contour Groups
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Contour group objects are created by the ‘contour’, ‘contourf’, and
‘contour3’ functions.  They are also one of the handles returned by the
‘surfc’ and ‘meshc’ functions.  The properties of the contour group are

‘contourmatrix’
     A read only property that contains the data return by ‘contourc’
     used to create the contours of the plot.

‘fill’
     A radio property that can have the values "on" or "off" that flags
     whether the contours to plot are to be filled.

‘zlevelmode’
‘zlevel’
     The radio property ‘zlevelmode’ can have the values "none", "auto",
     or "manual".  When its value is "none" there is no z component to
     the plotted contours.  When its value is "auto" the z value of the
     plotted contours is at the same value as the contour itself.  If
     the value is "manual", then the z value at which to plot the
     contour is determined by the ‘zlevel’ property.

‘levellistmode’
‘levellist’
‘levelstepmode’
‘levelstep’
     If ‘levellistmode’ is "manual", then the levels at which to plot
     the contours is determined by ‘levellist’.  If ‘levellistmode’ is
     set to "auto", then the distance between contours is determined by
     ‘levelstep’.  If both ‘levellistmode’ and ‘levelstepmode’ are set
     to "auto", then there are assumed to be 10 equal spaced contours.

‘textlistmode’
‘textlist’
‘textstepmode’
‘textstep’
     If ‘textlistmode’ is "manual", then the labeled contours is
     determined by ‘textlist’.  If ‘textlistmode’ is set to "auto", then
     the distance between labeled contours is determined by ‘textstep’.
     If both ‘textlistmode’ and ‘textstepmode’ are set to "auto", then
     there are assumed to be 10 equal spaced labeled contours.

‘showtext’
     Flag whether the contour labels are shown or not.

‘labelspacing’
     The distance between labels on a single contour in points.

‘linewidth’

‘linestyle’

‘linecolor’
     The properties of the contour lines.  The properties ‘linewidth’
     and ‘linestyle’ are similar to the corresponding properties for
     lines.  The property ‘linecolor’ is a color property (Note:
     Colors), that can also have the values of "none" or "auto".  If
     ‘linecolor’ is "none", then no contour line is drawn.  If
     ‘linecolor’ is "auto" then the line color is determined by the
     colormap.

‘xdata’
‘ydata’
‘zdata’
     The original x, y, and z data of the contour lines.

‘xdatasource’
‘ydatasource’
‘zdatasource’
     Data source variables.