Image Properties
Images are UI components that allow you to display a picture, such as an icon or
logo in your app. Image
properties control the appearance and behavior of
an image. Use dot notation to refer to a specific object and property.
fig = uifigure; im = uiimage(fig); im.ImageSource = "peppers.png";
Image
ImageSource
— Image source or file
''
(default) | string scalar | character vector | m
-by-n
-by-3 truecolor image array
Image source or file, specified as a string scalar, a character vector, or an
m
-by-n
-by-3 truecolor image array. If you
specify a file name, it can be an image file name on the MATLAB® path or a full path to an image file. If you plan to share an app with
others, put the image file on the MATLAB path to facilitate app packaging.
Supported image formats include JPEG, PNG, GIF, SVG, or
m
-by-n
-by-3 truecolor image array. For more
information about truecolor image arrays, see Image Types.
Example: im = uiimage("ImageSource","peppers.png");
Example: im.ImageSource = "C:\TEMP\ngc6543a.jpg";
HorizontalAlignment
— Horizontal alignment of rendered image
'center'
(default) | 'left'
| 'right'
Horizontal alignment of the rendered image within the image component area,
specified as 'center'
, 'left'
, or
'right'
. The horizontal alignment is relative to the inside borders
of the image component. Setting this property has no effect when the
ScaleMethod
property value is set to
'stretch'
.
For example, the table shows rendered images for each
HorizontalAlignment
value, where the
ScaleMethod
property value is set to 'none'
and the VerticalAlignment
property has the default value,
'center'
. You can implement many other combinations that are not
shown here.
Horizontal Alignment Value | Description | Rendered Image |
---|---|---|
'center' | Left and right edges of the image are equally spaced from the inside-left and inside-right borders of the image component, respectively. |
|
'left' | Left edge of the image aligns with the inside-left border of the image component. |
|
'right' | Right edge of the image aligns with the inside-right border of the image component. |
|
VerticalAlignment
— Vertical alignment of rendered image
'center'
(default) | 'top'
| 'bottom'
Vertical alignment of the rendered image within the image component area, specified
as 'center'
, 'left'
, or
'right'
. The vertical alignment is relative to the inside borders of
the image component. Setting this property has no effect when the
ScaleMethod
property value is set to
'stretch'
.
For example, the table shows rendered images for each
VerticalAlignment
value, where the
ScaleMethod
property value is set to 'none'
and the HorizontalAlignment
property has the default value,
'center'
. You can implement many other combinations that are not
shown here.
Vertical Alignment Value | Description | Rendered Image |
---|---|---|
'center' | Top and bottom edges of the image are equally spaced from the inside-top and inside-bottom borders of the image component, respectively. |
|
'top' | Top edge of the image aligns with the inside-top border of the image component. |
|
'bottom' | Bottom edge of the image aligns with the inside-bottom border of the image component. |
|
ScaleMethod
— Image scaling method
'fit'
(default) | 'fill'
| 'none'
| 'scaledown'
| 'scaleup'
| 'stretch'
Image scaling method, specified as one of the values listed in the table. Use this name-value pair argument to specify how you want your image to render within the component area.
The table also demonstrates each scale method with an example image. In the rendered image
examples, the BackgroundColor
property of the image component has been
set to 'magenta'
. The scaling behavior of SVG image files may vary based on
how the file is defined.
Value | Description | Example | Scales Up | Scales Down | Maintains Aspect Ratio | Clips Image | |
---|---|---|---|---|---|---|---|
Original Image | Rendered Image | ||||||
'fit' | Scales in any direction to display the image within the component area, and maintains aspect ratio without clipping. |
|
| Yes | Yes | Yes | No |
'fill' | Scales in any direction to fill the component area, maintaining aspect ratio and clipping if necessary. |
|
| Yes | Yes | Yes | Yes |
'none' | Uses the actual size of the image and maintains aspect ratio. If the component area is smaller than the image, the image is clipped. |
|
| No | No | Yes | Yes |
'scaledown' | Scales down and maintains aspect ratio without clipping. If the original image is larger than the
component area, the image scales down and renders as if the |
|
| No | Yes | Yes | No |
'scaleup' | Scales up and maintains aspect ratio with clipping. If the original image is smaller than the
component area, the image scales up and renders as if the |
|
| Yes | No | Yes | Yes |
'stretch' | Scales in any direction to fill the component area, without maintaining the aspect ratio and without clipping. |
|
| Yes | Yes | No | No |
Color
BackgroundColor
— Background Color
'none'
(default) | RGB triplet | hexadecimal color code | 'r'
| 'g'
| 'b'
| ...
Background color, specified as an RGB triplet, a hexadecimal color code, or one of the color options listed in the table.
For a custom color, specify an RGB triplet or a hexadecimal color code.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
, for example,[0.4 0.6 0.7]
.A hexadecimal color code is a string scalar or character vector that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Therefore, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|---|---|
"red" | "r" | [1 0 0] | "#FF0000" | |
"green" | "g" | [0 1 0] | "#00FF00" | |
"blue" | "b" | [0 0 1] | "#0000FF" | |
"cyan"
| "c" | [0 1 1] | "#00FFFF" | |
"magenta" | "m" | [1 0 1] | "#FF00FF" | |
"yellow" | "y" | [1 1 0] | "#FFFF00" | |
"black" | "k" | [0 0 0] | "#000000" | |
"white" | "w" | [1 1 1] | "#FFFFFF" | |
"none" | Not applicable | Not applicable | Not applicable | No color |
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|
[0 0.4470 0.7410] | "#0072BD" | |
[0.8500 0.3250 0.0980] | "#D95319" | |
[0.9290 0.6940 0.1250] | "#EDB120" | |
[0.4940 0.1840 0.5560] | "#7E2F8E" | |
[0.4660 0.6740 0.1880] | "#77AC30" | |
[0.3010 0.7450 0.9330] | "#4DBEEE" | |
[0.6350 0.0780 0.1840] | "#A2142F" |
Interactivity
URL
— Image hyperlink URL
''
(default) | character vector | string scalar
Image hyperlink URL, specified as a character vector or string scalar. When a user clicks the image, the web address specified by the URL opens in a new browser tab. If the user is running the app in a browser using MATLAB Online™ or as a web app, the new tab opens in the current browser. Otherwise, the new tab opens in the default browser on the user's system.
AltText
— Image alt text
''
(default) | string scalar | character vector
Image alt text (or alternative text), specified as a string scalar or character vector. Use this property to provide a description of the image. Screen readers use this text to describe the image.
Visible
— State of visibility
'on'
(default) | on/off logical value
State of visibility, specified as 'on'
or 'off'
,
or as numeric or logical 1
(true
) or
0
(false
). A value of 'on'
is equivalent to true
, and 'off'
is equivalent to
false
. Thus, you can use the value of this property as a logical
value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState
.
'on'
— Display the object.'off'
— Hide the object without deleting it. You still can access the properties of an invisible UI component.
To make your app start faster, set the Visible
property to
'off'
for all UI components that do not need to appear at
startup.
Enable
— Operational state
'on'
(default) | on/off logical value
Operational state, specified as 'on'
or 'off'
,
or as numeric or logical 1
(true
) or
0
(false
). A value of 'on'
is equivalent to true
, and 'off'
is equivalent to
false
. Thus, you can use the value of this property as a logical
value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState
.
If you set this property to
'on'
, the app user can interact with the component.If you set this property to
'off'
, the component appears dimmed, indicating that the app user cannot interact with it, and that it will not trigger a callback.
Tooltip
— Tooltip
''
(default) | character vector | cell array of character vectors | string array | 1-D categorical array
Tooltip, specified as a character vector, cell array of character vectors, string array, or 1-D categorical array. Use this property to display a message when the user hovers the pointer over the component at run time. The tooltip displays even when the component is disabled. To display multiple lines of text, specify a cell array of character vectors or a string array. Each element in the array becomes a separate line of text. If you specify this property as a categorical array, MATLAB uses the values in the array, not the full set of categories.
ContextMenu
— Context menu
empty GraphicsPlaceholder
array (default) | ContextMenu
object
Context menu, specified as a ContextMenu
object created using the uicontextmenu
function. Use this property to display a context menu when
you right-click on a component.
Position
Position
— Location and size of image component
[100 100 100 100]
(default) | [left bottom width height]
Location and size of image component relative to the parent, specified as a four element vector of the form [left bottom width height]
. This table describes each element in the vector.
Element | Description |
---|---|
left | Distance from the inner left edge of the parent container to the outer left edge of the image component |
bottom | Distance from the inner bottom edge of the parent container to the outer bottom edge of the image component |
width | Distance between the right and left outer edges of the image component |
height | Distance between the top and bottom outer edges of the image component |
The Position
values are relative to the drawable area of the parent container. The drawable area is the area inside the borders of the container and does not include the area occupied by decorations such as a menu bar or title.
All measurements are in pixel units.
InnerPosition
— Inner location and size of image component
[100 100 100 100]
(default) | [left bottom width height]
Inner location and size of image component, specified as a four element vector of
the form [left bottom width height]
. All measurements are in pixel
units. This property value is identical to the Position
property.
OuterPosition
— Outer location and size of image component
[100 100 100 100]
(default) | [left bottom width height]
This property is read-only.
Outer location and size of image component, returned as a four element vector of the
form [left bottom width height]
. All measurements are in pixel units.
This property value is identical to the Position
property.
Layout
— Layout options
empty LayoutOptions
array (default) | GridLayoutOptions
object
Layout options, specified as a GridLayoutOptions
object. This property specifies options for components that are children of grid layout containers. If the component is not a child of a grid layout container (for example, it is a child of a figure or panel), then this property is empty and has no effect. However, if the component is a child of a grid layout container, you can place the component in the desired row and column of the grid by setting the Row
and Column
properties on the GridLayoutOptions
object.
For example, this code places an image component in the third row and second column of its parent grid.
g = uigridlayout([4 3]); im = uiimage(g); im.ImageSource = 'peppers.png'; im.ScaleMethod = 'fill'; im.Layout.Row = 3; im.Layout.Column = 2;
To make the image span multiple rows or columns, specify the
Row
or Column
property as a two-element
vector. For example, this image spans columns 2
through
3
.
im.Layout.Column = [2 3];
Callbacks
ImageClickedFcn
— Image clicked callback
' ' (default) | function handle | cell array | character vector
Image clicked callback, specified as one of these values:
A function handle.
A cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
A character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
This callback executes when the user clicks the image in the app. If you specify a
link to open using the URL
property, the callback executes after
that link opens.
This callback function can access specific information about the user's interaction
with the image. MATLAB passes this information in an ImageClickedData
object
as the second argument to your callback function. In App Designer, the argument is
called event
. You can query the object's properties using dot
notation. For example, event.Source
returns the
Image
object that the user is interacting with to trigger the
callback. The ImageClickedData
object is not available to callback
functions specified as character vectors.
The following table lists the properties of the ImageClickedData
object.
Property | Value |
---|---|
EventName | 'ImageClicked' |
Source | Component executing the callback |
For more information about writing callbacks, see Callbacks in App Designer.
CreateFcn
— Creation function
''
(default) | function handle | cell array | character vector
Object creation function, specified as one of these values:
Function handle.
Cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
Character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
For more information about specifying a callback as a function handle, cell array, or character vector, see Callbacks in App Designer.
This property specifies a callback function to execute when MATLAB creates the object. MATLAB initializes all property values before executing the CreateFcn
callback. If you do not specify the CreateFcn
property, then MATLAB executes a default creation function.
Setting the CreateFcn
property on an existing component has no effect.
If you specify this property as a function handle or cell array, you can access the object that is being created using the first argument of the callback function. Otherwise, use the gcbo
function to access the object.
DeleteFcn
— Deletion function
''
(default) | function handle | cell array | character vector
Object deletion function, specified as one of these values:
Function handle.
Cell array in which the first element is a function handle. Subsequent elements in the cell array are the arguments to pass to the callback function.
Character vector containing a valid MATLAB expression (not recommended). MATLAB evaluates this expression in the base workspace.
For more information about specifying a callback as a function handle, cell array, or character vector, see Callbacks in App Designer.
This property specifies a callback function to execute when MATLAB deletes the object. MATLAB executes the DeleteFcn
callback before destroying the
properties of the object. If you do not specify the DeleteFcn
property, then MATLAB executes a default deletion function.
If you specify this property as a function handle or cell array, you can access the
object that is being deleted using the first argument of the callback function.
Otherwise, use the gcbo
function to access the
object.
Callback Execution Control
Interruptible
— Callback interruption
'on'
(default) | on/off logical value
Callback interruption, specified as 'on'
or 'off'
, or as
numeric or logical 1
(true
) or
0
(false
). A value of 'on'
is equivalent to true
, and 'off'
is equivalent to
false
. Thus, you can use the value of this property as a logical
value. The value is stored as an on/off logical value of type matlab.lang.OnOffSwitchState
.
This property determines if a running callback can be interrupted. There are two callback states to consider:
The running callback is the currently executing callback.
The interrupting callback is a callback that tries to interrupt the running callback.
MATLAB determines callback interruption behavior whenever it executes a command that
processes the callback queue. These commands include drawnow
, figure
, uifigure
, getframe
, waitfor
, and pause
.
If the running callback does not contain one of these commands, then no interruption occurs. MATLAB first finishes executing the running callback, and later executes the interrupting callback.
If the running callback does contain one of these commands, then the
Interruptible
property of the object that owns the running
callback determines if the interruption occurs:
If the value of
Interruptible
is'off'
, then no interruption occurs. Instead, theBusyAction
property of the object that owns the interrupting callback determines if the interrupting callback is discarded or added to the callback queue.If the value of
Interruptible
is'on'
, then the interruption occurs. The next time MATLAB processes the callback queue, it stops the execution of the running callback and executes the interrupting callback. After the interrupting callback completes, MATLAB then resumes executing the running callback.
Note
Callback interruption and execution behave differently in these situations:
If the interrupting callback is a
DeleteFcn
,CloseRequestFcn
, orSizeChangedFcn
callback, then the interruption occurs regardless of theInterruptible
property value.If the running callback is currently executing the
waitfor
function, then the interruption occurs regardless of theInterruptible
property value.If the interrupting callback is owned by a
Timer
object, then the callback executes according to schedule regardless of theInterruptible
property value.
BusyAction
— Callback queuing
'queue'
(default) | 'cancel'
Callback queuing, specified as 'queue'
or 'cancel'
. The BusyAction
property determines how MATLAB handles the execution of interrupting callbacks. There are two callback states to consider:
The running callback is the currently executing callback.
The interrupting callback is a callback that tries to interrupt the running callback.
The BusyAction
property determines callback queuing behavior only
when both of these conditions are met:
Under these conditions, the BusyAction
property of the
object that owns the interrupting callback determines how MATLAB handles the interrupting callback. These are possible values of the
BusyAction
property:
'queue'
— Puts the interrupting callback in a queue to be processed after the running callback finishes execution.'cancel'
— Does not execute the interrupting callback.
BeingDeleted
— Deletion status
on/off logical value
This property is read-only.
Deletion status, returned as an on/off logical value of type matlab.lang.OnOffSwitchState
.
MATLAB sets the BeingDeleted
property to
'on'
when the DeleteFcn
callback begins
execution. The BeingDeleted
property remains set to
'on'
until the component object no longer exists.
Check the value of the BeingDeleted
property to verify that the object is not about to be deleted before querying or modifying it.
Parent/Child
Parent
— Parent container
Figure
object (default) | Panel
object | Tab
object | ButtonGroup
object | GridLayout
object
Parent container, specified as a Figure
object
created using the uifigure
function, or one of its child
containers: Tab
, Panel
, ButtonGroup
, or GridLayout
. If no container is specified, MATLAB calls the uifigure
function to create a new Figure
object that serves as the parent container.
HandleVisibility
— Visibility of object handle
'on'
(default) | 'callback'
| 'off'
Visibility of the object handle, specified as 'on'
, 'callback'
,
or 'off'
.
This property controls the visibility of the object in its parent's
list of children. When an object is not visible in its parent's list
of children, it is not returned by functions that obtain objects by
searching the object hierarchy or querying properties. These functions
include get
, findobj
, clf
,
and close
. Objects are valid
even if they are not visible. If you can access an object, you can
set and get its properties, and pass it to any function that operates
on objects.
HandleVisibility Value | Description |
---|---|
'on' | The object is always visible. |
'callback' | The object is visible from within callbacks or functions invoked by callbacks, but not from within functions invoked from the command line. This option blocks access to the object at the command-line, but allows callback functions to access it. |
'off' | The object is invisible at all times. This option is useful
for preventing unintended changes to the UI by another function. Set
the HandleVisibility to 'off' to
temporarily hide the object during the execution of that function.
|
Identifiers
Type
— Type of graphics object
'uiimage'
This property is read-only.
Type of graphics object, returned as 'uiimage'
.
Tag
— Object identifier
''
(default) | character vector | string scalar
Object identifier, specified as a character vector or string scalar. You can specify a unique Tag
value to serve as an identifier for an object. When you need access to the object elsewhere in your code, you can use the findobj
function to search for the object based on the Tag
value.
UserData
— User data
[]
(default) | array
User data, specified as any MATLAB array. For example, you can specify a scalar, vector, matrix, cell array, character array, table, or structure. Use this property to store arbitrary data on an object.
If you are working in App Designer, create public or private properties in the app to share data instead of using the UserData
property. For more information, see Share Data Within App Designer Apps.
Version History
Introduced in R2019aR2023a: Specify image alt text
Specify the AltText
property to provide a description of the image.
Screen readers use this text to describe the image when an app user navigates through your
app.
R2022b: Create an image hyperlink using the URL
property
To open a web address when a user clicks an image in your app, specify the image
URL
property.
See Also
Functions
Tools
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