octave: Image Properties

 
 15.3.3.6 Image Properties
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 The ‘image’ properties are:
 
 ‘__modified__’: "off" | {"on"}
 
 ‘alphadata’: scalar | matrix, def. ‘1’
      Transparency is not yet implemented for image objects.  ‘alphadata’
      is unused.
 
 ‘alphadatamapping’: "direct" | {"none"} | "scaled"
      Transparency is not yet implemented for image objects.
      ‘alphadatamapping’ is unused.
 
 ‘beingdeleted’: {"off"} | "on"
 
 ‘busyaction’: "cancel" | {"queue"}
 
 ‘buttondownfcn’: string | function handle, def. ‘[](0x0)’
      For information on how to write graphics listener functions see
      SeeCallbacks section Callbacks.
 
 ‘cdata’: matrix, def. 64-by-64 double
 
 ‘cdatamapping’: {"direct"} | "scaled"
 
 ‘children’ (read-only): vector of graphics handles, def. ‘[](0x1)’
      ‘children’ is unused.
 
 ‘clipping’: "off" | {"on"}
      If ‘clipping’ is "on", the image is clipped in its parent axes
      limits.
 
 ‘createfcn’: string | function handle, def. ‘[](0x0)’
      Callback function executed immediately after image has been
      created.  Function is set by using default property on root object,
      e.g., ‘set (0, "defaultimagecreatefcn", 'disp ("image
      created!")')’.
 
      For information on how to write graphics listener functions see
      SeeCallbacks section Callbacks.
 
 ‘deletefcn’: string | function handle, def. ‘[](0x0)’
      Callback function executed immediately before image is deleted.
 
      For information on how to write graphics listener functions see
      SeeCallbacks section Callbacks.
 
 ‘displayname’: string | cell array of strings, def. ""
      Text for the legend entry corresponding to this image.
 
 ‘handlevisibility’: "callback" | "off" | {"on"}
      If ‘handlevisibility’ is "off", the image’s handle is not visible
      in its parent’s "children" property.
 
 ‘hittest’: "off" | {"on"}
 
 ‘interruptible’: "off" | {"on"}
 
 ‘parent’: graphics handle
      Handle of the parent graphics object.
 
 ‘selected’: {"off"} | "on"
 
 ‘selectionhighlight’: "off" | {"on"}
 
 ‘tag’: string, def. ""
      A user-defined string to label the graphics object.
 
 ‘type’ (read-only): string
      Class name of the graphics object.  ‘type’ is always "image"
 
 ‘uicontextmenu’: graphics handle, def. ‘[](0x0)’
      Graphics handle of the uicontextmenu object that is currently
      associated to this image object.
 
 ‘userdata’: Any Octave data, def. ‘[](0x0)’
      User-defined data to associate with the graphics object.
 
 ‘visible’: "off" | {"on"}
      If ‘visible’ is "off", the image is not rendered on screen.
 
 ‘xdata’: two-element vector, def. ‘[1 64]’
      Two-element vector ‘[xmin xmax]’ specifying the x coordinates of
      the first and last columns of the image.
 
      Setting ‘xdata’ to the empty matrix ([]) will restore the default
      value of ‘[1 columns(image)]’.
 
 ‘ydata’: two-element vector, def. ‘[1 64]’
      Two-element vector ‘[ymin ymax]’ specifying the y coordinates of
      the first and last rows of the image.
 
      Setting ‘ydata’ to the empty matrix ([]) will restore the default
      value of ‘[1 rows(image)]’.