Altimeter Properties
Control altimeter appearance and behavior
Altimeters are components that represent an altimeter. Properties control the appearance and behavior of an altimeter. Use dot notation to refer to a particular object and property:
f = uifigure; altimeter = uiaeroaltimeter(f); altimeter.Altitude = 100;
The altimeter displays the altitude above sea level in feet, also known as the pressure altitude. It displays the altitude value with needles on a gauge and a numeric indicator.
The gauge has 10 major ticks. Within each major tick are five minor ticks. This gauge has three needles. Using the needles, the altimeter can display accurately only altitudes between 0 and 100,000 feet.
For the longest needle, an increment of a small tick represents 20 feet and a major tick represents 100 feet.
For the second longest needle, a minor tick represents 200 feet and a major tick represents 1,000 feet.
For the shortest needle a minor tick represents 2,000 feet and a major tick represents 10,000 feet.
For the numeric display, the gauge shows values as numeric characters between 0 and 9,999 feet. When the numeric display value reaches 10,000 feet, the gauge displays the value as the remaining values below 10,000 feet. For example, 12,345 feet displays as 2,345 feet. When a value is less than 0 (below sea level), the gauge displays
0
. The needles show the appropriate value except for when the value is below sea level or over 100000 feet. Below sea level, the needles set to0
, over 100,000, the needles stay set at 100,000.
Altimeter
Altitude
— Altitude of aircraft
0
(default) | finite, real, and scalar numeric
Altitude of the aircraft, specified as any finite and scalar numeric, in feet.
Example: 60
Dependencies
Specifying this value changes the value of Value
.
Data Types: double
Value
— Location of aircraft heading
0
(default) | finite, real, and scalar numeric
Location of the aircraft altitude, specified as a finite and scalar numeric, in feet.
Changing the value changes the direction of the heading in 5-degree increments.
Example: 60
Dependencies
Specifying this value changes the value of the Altitude
value.
Data Types: double
Interactivity
Visible
— Visibility of altimeter
'on'
(default) | on/off logical value
Visibility of the altimeter, 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
. The
Visible
property determines whether the altimeter is displayed on
the screen. If the Visible
property is set to
'off'
, then the entire altimeter is hidden, but you can still
specify and access its properties.
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.
Enable
— Operational state of altimeter
'on'
(default) | on/off logical value
Operational state of altimeter, 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'
, then the appearance of the altimeter indicates that the altimeter is operational.If you set this property to
'off'
, then the appearance of the altimeter appears dimmed, indicating that the altimeter is not operational.
Position
Position
— Location and size of altimeter
[100 100 120 120]
(default) | [left bottom width height]
Location and size of the altimeter relative to the parent container, specified as
the vector, [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 an imaginary box surrounding the altimeter |
bottom | Distance from the inner bottom edge of the parent container to the outer bottom edge of an imaginary box surrounding the altimeter |
width | Distance between the right and left outer edges of the altimeter |
height | Distance between the top and bottom outer edges of the altimeter |
All measurements are in pixel units.
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.
Example: [200 120 120 120]
InnerPosition
— Inner location and size of altimeter
[100 100 120 120]
(default) | [left bottom width height]
Inner location and size of the altimeter, specified as [left bottom width
height]
. Position values are relative to the parent container. All
measurements are in pixel units. This property value is identical to the
Position
property.
OuterPosition
— Outer location and size of altimeter
[100 100 120 120]]
(default) | [left bottom width height]
This property is read-only.
Outer location and size of the altimeter returned as [left bottom width
height]
. Position values are relative to the parent container. 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 altimeter in the third row and second column of its parent grid.
g = uigridlayout([4 3]); gauge = uiaeroaltimeter(g); gauge.Layout.Row = 3; gauge.Layout.Column = 2;
To make the altimeter span multiple rows or columns, specify the
Row
or Column
property as a two-element
vector. For example, this altimeter spans columns 2
through
3
:
gauge.Layout.Column = [2 3];
Callbacks
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
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. |
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.
Identifiers
Type
— Type of graphics object
'uiaeroaltimeter'
This property is read-only.
Type of graphics object, returned as 'uiaeroaltimeter'
.
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 R2018b
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