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15.3.3.6 Image Properties

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)


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!")').


deletefcn: string | function handle, def. [](0x0)
Callback function executed immediately before image is deleted.


displayname: string | cell array of strings, def. ""
Text for the legend entry corresponding to this image.


erasemode: "background" | "none" | {"normal"} | "xor"
erasemode is unused.


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)].