Polyline

R2026b

Polyline region of interest

Description

A Polyline object specifies the shape and position of an axes-based polyline region of interest (ROI). You can customize the appearance and interactive behavior of the ROI.

Axes-based ROIs enable you to draw and edit regions of interest on images displayed using imshow or in MATLAB^® axes. Axes-based ROIs offer maximum customization of appearance and behavior, including line width, marker style, and edge color. Use axes-based ROIs for fine-grained control over ROI appearance, integration with existing axes-based apps, or access to the assisted freehand, crosshair, or cuboid ROI types. For a comparison of axes-based ROIs with other ROIs, see Choose Approach to Annotate ROIs in Images.

Blue Polyline ROI with 12 line segments drawn over an object in an image.

For more information about using this ROI, including keyboard shortcuts, see Tips.

Creation

There are two ways to create a Polyline object. For more information, see Create Axes-Based ROIs.

Use the drawpolyline function. Use this function when you want to create the ROI and set the appearance in a single command. You can specify the shape and position of the ROI interactively by drawing the ROI over an image using the mouse, or programmatically by using name-value arguments.
Use the images.roi.Polyline function described here. Use this function when you want to specify the appearance and behavior of the ROI before you specify the shape and position of the ROI. After creating the object, you can specify the shape and position interactively by using the draw function or programmatically by modifying properties of the object.

Syntax

roi = images.roi.Polyline

roi = images.roi.Polyline(ax,___)

roi = images.roi.Polyline(___,PropertyName=Value)

Description

roi = images.roi.Polyline creates a Polyline object with default properties.

example

roi = images.roi.Polyline(ax,___) creates the ROI in the axes specified by ax.

roi = images.roi.Polyline(___,PropertyName=Value) sets properties of the ROI using one or more name-value arguments.

Example: images.roi.Polyline(Color="y") creates a yellow colored Polyline object.

Input Arguments

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`ax` — Parent of ROI
`gca` (default) | `Axes` object | `UIAxes` object

Parent of the ROI, specified as an Axes object or a UIAxes object.

Properties

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Shape and Position

`Position` — Position of ROI
`[]` (default) | n-by-2 numeric matrix

Position of the ROI, specified as an n-by-2 numeric matrix where n is the number of vertices or points defining the ROI. Each row represents the [x y] coordinates of a vertex or point. The Polyline object generates these points as you draw the ROI shape interactively. To work with fewer points, use the reduce function.

Color and Styling

`Color` — ROI color
`[0 0.4470 0.7410]` (default) | RGB triplet | hexadecimal color code | color name | short color name

ROI color, specified as an RGB triplet, a hexadecimal color code, a color name, or a short color name.

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 from 0 to F. 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 the hexadecimal color codes.

Color Name	Short Name	RGB Triplet	Hexadecimal Color Code
`"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"`

This table lists the default color palettes for plots in the light and dark themes.

Palette Palette Colors

Palette	Palette Colors
`"gem"` — Light theme default Before R2025a: Most plots use these colors by default.
`"glow"` — Dark theme default

"gem" — Light theme default

Before R2025a: Most plots use these colors by default.

"glow" — Dark theme default

You can get the RGB triplets and hexadecimal color codes for these palettes using the orderedcolors and rgb2hex functions. For example, get the RGB triplets for the "gem" palette and convert them to hexadecimal color codes.

RGB = orderedcolors("gem");
H = rgb2hex(RGB);

Example: Color="r"

Example: Color="green"

Example: Color=[0 0.4470 0.7410]

Example: Color="#00FFFF"

`LineWidth` — Width of ROI border
positive number

Width of the ROI border, specified as a positive number in points. The default value is three times the number of points per screen pixel, such that the border is three pixels wide.

`MarkerSize` — Marker size
positive number

Marker size, specified as a positive number in points. The default value is eight times the number of points per screen pixel, such that markers are eight pixels in size.

`SelectedColor` — Color of ROI when selected
`"none"` (default) | RGB triplet | hexadecimal color code | color name | short color name

Color of the ROI when selected, specified as an RGB triplet, a hexadecimal color code, a color name, a short color name, or "none". If you specify "none", then the value of Color defines the color of the ROI for all states, selected or not.

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 from 0 to F. 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 the hexadecimal color codes.

Color Name	Short Name	RGB Triplet	Hexadecimal Color Code
`"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"`

This table lists the default color palettes for plots in the light and dark themes.

Palette Palette Colors

Palette	Palette Colors
`"gem"` — Light theme default Before R2025a: Most plots use these colors by default.
`"glow"` — Dark theme default

"gem" — Light theme default

Before R2025a: Most plots use these colors by default.

"glow" — Dark theme default

RGB = orderedcolors("gem");
H = rgb2hex(RGB);

Example: SelectedColor="r"

Example: SelectedColor="green"

Example: SelectedColor=[0 0.4470 0.7410]

Example: SelectedColor="#00FFFF"

`StripeColor` — Color of ROI stripe
`"none"` (default) | RGB triplet | hexadecimal color code | color name | short color name

Color of the ROI stripe, specified as an RGB triplet, a hexadecimal color code, a color name, a short color name, or "none". If you specify "none", then the ROI edge is a solid color specified by Color. Otherwise, the edge of the ROI is striped, with colors alternating between the colors specified by Color and StripeColor.

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 from 0 to F. 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 the hexadecimal color codes.

Color Name	Short Name	RGB Triplet	Hexadecimal Color Code
`"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"`

This table lists the default color palettes for plots in the light and dark themes.

Palette Palette Colors

Palette	Palette Colors
`"gem"` — Light theme default Before R2025a: Most plots use these colors by default.
`"glow"` — Dark theme default

"gem" — Light theme default

Before R2025a: Most plots use these colors by default.

"glow" — Dark theme default

RGB = orderedcolors("gem");
H = rgb2hex(RGB);

Example: StripeColor="r"

Example: StripeColor="green"

Example: StripeColor=[0 0.4470 0.7410]

Example: StripeColor="#00FFFF"

`Visible` — ROI visibility
`"on"` (default) | `"off"` | on/off logical value

ROI visibility, specified as "on" or "off", or as a numeric or logical 0 (false) or 1 (true). A value of "on" is equivalent to true, and "off" is equivalent to false. The value is stored as an on/off logical value of type OnOffSwitchState.

Value	Description
`"on"`	Display the ROI.
`"off"`	Hide the ROI without deleting it. You can still access the properties of an invisible ROI.

Labels

`Label` — ROI label
`''` (default) | character vector | string scalar

ROI label, specified as a character vector or string scalar. By default, the ROI has no label ('').

`LabelAlpha` — Transparency of text background
`1` (default) | number in the range [0, 1]

Transparency of the text background, specified as a number in the range [0, 1]. When set to 1, the text background is completely opaque. When set to 0, the text background is completely transparent.

`LabelTextColor` — Label text color
`"black"` (default) | RGB triplet | hexadecimal color code | color name | short color name

Label text color, specified as an RGB triplet, a hexadecimal color code, a color name, or a short color name.

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 from 0 to F. 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 the hexadecimal color codes.

Color Name	Short Name	RGB Triplet	Hexadecimal Color Code
`"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"`

This table lists the default color palettes for plots in the light and dark themes.

Palette Palette Colors

Palette	Palette Colors
`"gem"` — Light theme default Before R2025a: Most plots use these colors by default.
`"glow"` — Dark theme default

"gem" — Light theme default

Before R2025a: Most plots use these colors by default.

"glow" — Dark theme default

RGB = orderedcolors("gem");
H = rgb2hex(RGB);

Example: LabelTextColor="r"

Example: LabelTextColor="green"

Example: LabelTextColor=[0 0.4470 0.7410]

Example: LabelTextColor="#00FFFF"

`LabelVisible` — Label visibility
`"on"` (default) | `"off"` | `"hover"`

Label visibility, specified as one of these values.

Value	Description
`"on"`	Label is visible when the ROI is visible.
`"hover"`	Label is visible only when the mouse is hovering over the ROI.
`"off"`	Label is not visible.

Interactivity

`ContextMenu` — Context menu
`ContextMenu` object

Context menu that displays when you right-click the ROI, specified as a ContextMenu object. You can create a custom context menu by using the uicontextmenu function and then configuring context menu properties.

`Deletable` — Context menu provides option to delete the ROI
`true` or `1` (default) | `false` or `0`

Context menu provides an option to delete the ROI, specified as a numeric or logical 1 (true) or 0 (false). When the value is true, you can delete the ROI interactively using the context menu. When the value is false, the context menu option to delete the ROI is disabled.

In both cases, you can delete the ROI outside of the context menu by using the delete function.

`DrawingArea` — Area of axes in which you can interactively place ROI
`"auto"` (default) | `"unlimited"` | `[x,y,w,h]`

Area of the axes in which you can interactively place the ROI, specified as one of the values in this table.

Value	Description
`"auto"`	The drawing area is the current axes limits (default).
`"unlimited"`	The drawing area has no boundary and ROIs can be drawn or dragged to extend beyond the axes limits.
`[x,y,w,h]`	The drawing area is restricted to a rectangular region beginning at (x,y), and extending to width w and height h.

`InteractionsAllowed` — Interactivity of ROI
`"all"` (default) | `"none"` | `"reshape"` | `"translate"`

Interactivity of the ROI, specified as one of the values in this table.

Value	Description
`"all"`	You can fully interact with the ROI. Reshape the ROI by changing the position of individual vertices, or move (translate) the entire ROI.
`"none"`	You cannot interact with the ROI or access the context menu. No drag points are visible.
`"translate"`	You can move the entire ROI within the drawing area. The relative position of vertices is fixed and you cannot reshape the ROI.
`"reshape"`	You can reshape the ROI by changing the position of individual vertices. You cannot move the ROI.

You can access the context menu for all values of InteractionsAllowed except "none".

`Selected` — Selection state of ROI
`false`, `0`, or `"off"` (default) | `true`, `1`, or `"on"`

Selection state of the ROI, specified as "off" or "on", or as a numeric or logical 0 (false) or 1 (true). A value of "off" is equivalent to false, and "on" is equivalent to true.

You can also set this property interactively. For example, clicking on the ROI selects the ROI and sets this property to true. Similarly, pressing the Ctrl key and clicking the ROI deselects the ROI and sets the value of this property to false.

Parent/Child

`HandleVisibility` — Visibility of ROI handle in `Children` property of parent
`"on"` (default) | `"off"` | `"callback"`

Visibility of the ROI handle in the Children property of the parent, specified as one of the values in this table.

Value	Description
`"on"`	The object handle is always visible (default).
`"off"`	The object handle is hidden at all times.
`"callback"`	The object handle is visible from within callbacks or functions invoked by callbacks, but not from within functions invoked from the command line.

`Parent` — ROI parent
`Axes` object | `UIAxes` object

ROI parent, specified as an Axes or UIAxes object.

Identifiers

`Tag` — Tag to associate with ROI
`''` (default) | character vector | string scalar

Tag to associate with the ROI, specified as a character vector or string scalar. Use the tag value to find the ROI object in a hierarchy of objects using the findobj function.

`UserData` — Data to associate with ROI
any MATLAB data

Data to associate with the ROI, specified as any MATLAB data. For example, you can specify a scalar, vector, matrix, cell array, string, character array, table, or structure. The Polyline object does not use this data.

Object Functions

`addlistener`	Create event listener bound to event source
`beginDrawingFromPoint`	Begin drawing ROI from specified point
`bringToFront`	Bring ROI to front of Axes stacking order
`createMask`	Create binary mask image from ROI
`draw`	Begin drawing ROI interactively
`reduce`	Reduce density of points in ROI
`wait`	Block MATLAB command line until ROI operation is finished

Examples

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Create Polyline ROI Non-interactively

Open Live Script

Read an image into the workspace and display it.

I = imread("baby.jpg");
figure;
imshow(I)

Figure contains an axes object. The hidden axes object contains an object of type image.

Create a polyline ROI on the image, using properties to specify the location of vertices. For programmatically created ROIs, if you want the ROI drawn in a specific axes, you must specify that axes as an input argument. Otherwise, an instance of the images.roi.Polyline class is created but not displayed. In this example, specify the current axes (gca) to draw the ROI on the image in that axes.

h = images.roi.Polyline(gca,Position=[100 150; 200 250; 300 350; 150 450]);

Figure contains an axes object. The hidden axes object contains 2 objects of type image, images.roi.polyline.

Set Up Listeners for Polyline ROI Events

Open Live Script

Read an image into the workspace.

I = imread('cameraman.tif');

Display the image.

imshow(I);

Draw a Polyline ROI on the image. Because this example specifies the length and location of the ROI, you do not have to call the draw method to enable interactive drawing.

roi = images.roi.Polyline(gca,'Position',[115 30; 80 45; 80 80; 115 90; 145 65]);

Set up listeners for ROI moving events. When you move it, the ROI sends notifications of these events and executes the callback function you specify.

addlistener(roi,'MovingROI',@allevents);
addlistener(roi,'ROIMoved',@allevents);

The allevents callback function displays at the command line the previous position and the current position of the ROI.

function allevents(src,evt)
evname = evt.EventName;
    switch(evname)
        case{'MovingROI'}
            disp(['ROI moving Previous Position: ' mat2str(evt.PreviousPosition)]);
            disp(['ROI moving Current Position: ' mat2str(evt.CurrentPosition)]);
        case{'ROIMoved'}
            disp(['ROI moved Previous Position: ' mat2str(evt.PreviousPosition)]);
            disp(['ROI moved Current Position: ' mat2str(evt.CurrentPosition)]);
    end
end

More About

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Events

To receive notification from the ROI when certain events happen, set up listeners for these events. You can specify a callback function that executes when one of these events occurs. When the ROI notifies your application through the listener, it returns data specific to the event. Look at the event class for the specific event to see what is returned.

For an example, see Set Up Listeners for Polyline ROI Events.

Event Name	Trigger	Event Data	Event Attributes
`DeletingROI`	ROI is about to be interactively deleted.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`DrawingStarted`	ROI is about to be interactively drawn.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`DrawingFinished`	ROI has been interactively drawn.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`MovingROI`	ROI shape or location is being interactively changed.	`images.roi.ROIMovingEventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`ROIMoved`	ROI shape or location has been interactively changed.	`images.roi.ROIMovingEventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`ROIClicked`	ROI has been clicked.	`images.roi.ROIClickedEventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`AddingVertex`	A vertex is about to be interactively added to the ROI.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`VertexAdded`	A vertex has been interactively added to the ROI.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`DeletingVertex`	A vertex is about to be interactively deleted from the ROI.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`
`VertexDeleted`	A vertex has been interactively deleted from the ROI.	`event.EventData`	`NotifyAccess`: `private` `ListenAccess`: `public`

Tips

To draw the ROI interactively using the draw or drawpolyline function, position the cursor on the axes and click and drag to create the shape. As you draw, click to place vertices along the line. Double-click to finish drawing the polyline.

The ROI supports the following interactivity, including keyboard shortcuts.

Behavior	Keyboard shortcut
Make drawn line snap at 15 degree angles.	Hold the Shift key while drawing.
Finish drawing the ROI.	Double-click, which adds a final new vertex at the pointer position. Right-click, which completes the polyline at the previous vertex without adding a new vertex at the pointer position. Press Enter, which completes the polyline at the previous vertex without adding a new vertex at the pointer position.
Cancel drawing the ROI.	Press Esc. The function returns a valid ROI object with an empty `Position` property.
Add a new vertex to the ROI.	Position the pointer over the polygon and double-click. You can also position the pointer over the ROI, right-click, and choose Add Vertex.
Remove a vertex from the ROI.	Position the pointer over the ROI, right-click, and choose Delete Vertex.
Remove the most recently added vertex but keep drawing.	Press Backspace. The function redraws the line from the previous vertex to the current position of the pointer. You can only back up to the first vertex you drew.
Resize (reshape) the ROI.	Position pointer over a vertex and then click and drag. Add a new vertex and then click and drag. Remove a vertex and the shape of the ROI adjusts.
Move the ROI.	Position the pointer over the line, not on a vertex. The pointer changes to the fleur shape. Click and drag the polygon.
Delete the ROI.	Position the pointer over the line, right-click, and select Delete Polyline from the context menu. You can also delete the ROI programmatically using the `delete` function.

Version History

Introduced in R2018b

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R2026a: Specify colors using hexadecimal color codes

You can now specify colors, such as the Color, LabelTextColor, SelectedColor, and StripeColor properties, using hexadecimal color codes.

R2020a: `UIContextMenu` property is not recommended

Starting in R2020a, using the UIContextMenu property to assign a context menu to an ROI object is not recommended. Use the ContextMenu property instead. The property values are the same.

There are no plans to remove support for the UIContextMenu property at this time.

Polyline

Description

Creation

Syntax

Description

Input Arguments

ax — Parent of ROI gca (default) | Axes object | UIAxes object

Properties

Shape and Position

Position — Position of ROI [] (default) | n-by-2 numeric matrix

Color and Styling

Color — ROI color [0 0.4470 0.7410] (default) | RGB triplet | hexadecimal color code | color name | short color name

LineWidth — Width of ROI border positive number

MarkerSize — Marker size positive number

SelectedColor — Color of ROI when selected "none" (default) | RGB triplet | hexadecimal color code | color name | short color name

StripeColor — Color of ROI stripe "none" (default) | RGB triplet | hexadecimal color code | color name | short color name

Visible — ROI visibility "on" (default) | "off" | on/off logical value

Labels

Label — ROI label '' (default) | character vector | string scalar

LabelAlpha — Transparency of text background 1 (default) | number in the range [0, 1]

LabelTextColor — Label text color "black" (default) | RGB triplet | hexadecimal color code | color name | short color name

LabelVisible — Label visibility "on" (default) | "off" | "hover"

Interactivity

ContextMenu — Context menu ContextMenu object

Deletable — Context menu provides option to delete the ROI true or 1 (default) | false or 0

DrawingArea — Area of axes in which you can interactively place ROI "auto" (default) | "unlimited" | [x,y,w,h]

InteractionsAllowed — Interactivity of ROI "all" (default) | "none" | "reshape" | "translate"

Selected — Selection state of ROI false, 0, or "off" (default) | true, 1, or "on"

Parent/Child

HandleVisibility — Visibility of ROI handle in Children property of parent "on" (default) | "off" | "callback"

Parent — ROI parent Axes object | UIAxes object

Identifiers

Tag — Tag to associate with ROI '' (default) | character vector | string scalar

UserData — Data to associate with ROI any MATLAB data

Object Functions

Examples

Create Polyline ROI Non-interactively

Set Up Listeners for Polyline ROI Events

More About

Events

Tips

Version History

R2026a: Specify colors using hexadecimal color codes

R2020a: UIContextMenu property is not recommended

See Also

Topics

`ax` — Parent of ROI
`gca` (default) | `Axes` object | `UIAxes` object

`Position` — Position of ROI
`[]` (default) | n-by-2 numeric matrix

`Color` — ROI color
`[0 0.4470 0.7410]` (default) | RGB triplet | hexadecimal color code | color name | short color name

`LineWidth` — Width of ROI border
positive number

`MarkerSize` — Marker size
positive number

`SelectedColor` — Color of ROI when selected
`"none"` (default) | RGB triplet | hexadecimal color code | color name | short color name

`StripeColor` — Color of ROI stripe
`"none"` (default) | RGB triplet | hexadecimal color code | color name | short color name

`Visible` — ROI visibility
`"on"` (default) | `"off"` | on/off logical value

`Label` — ROI label
`''` (default) | character vector | string scalar

`LabelAlpha` — Transparency of text background
`1` (default) | number in the range [0, 1]

`LabelTextColor` — Label text color
`"black"` (default) | RGB triplet | hexadecimal color code | color name | short color name

`LabelVisible` — Label visibility
`"on"` (default) | `"off"` | `"hover"`

`ContextMenu` — Context menu
`ContextMenu` object

`Deletable` — Context menu provides option to delete the ROI
`true` or `1` (default) | `false` or `0`

`DrawingArea` — Area of axes in which you can interactively place ROI
`"auto"` (default) | `"unlimited"` | `[x,y,w,h]`

`InteractionsAllowed` — Interactivity of ROI
`"all"` (default) | `"none"` | `"reshape"` | `"translate"`

`Selected` — Selection state of ROI
`false`, `0`, or `"off"` (default) | `true`, `1`, or `"on"`

`HandleVisibility` — Visibility of ROI handle in `Children` property of parent
`"on"` (default) | `"off"` | `"callback"`

`Parent` — ROI parent
`Axes` object | `UIAxes` object

`Tag` — Tag to associate with ROI
`''` (default) | character vector | string scalar

`UserData` — Data to associate with ROI
any MATLAB data

R2020a: `UIContextMenu` property is not recommended