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
Callbacks 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
Callbacks 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
Callbacks 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)]’.