AirspeedIndicator Properties
Control airspeed indicator appearance and behavior
Airspeed indicators are components that represent an airspeed indicator. Properties control the appearance and behavior of an airspeed indicator. Use dot notation to refer to a particular object and property:
f = uifigure; airspeed = uiaeroairspeed(f); airspeed.Airspeed = 100;
By default, minor ticks represent 10-knot increments and major ticks represent 40-knot increments. The parameters Minimum and Maximum determine the minimum and maximum values on the gauge. The number and distribution of ticks is fixed, which means that the first and last tick display the minimum and maximum values. The ticks in between distribute evenly between the minimum and maximum values. For major ticks, the distribution of ticks is (Maximum-Minimum)/9. For minor ticks, the distribution of ticks is (Maximum-Minimum)/36.
The airspeed indicator has scale color bars that allow for overlapping for the first bar, displayed at a different radius. This different radius lets the block represent maximum speed with flap extended (VFE) and stall speed with flap extended (VSO) accurately for aircraft airspeed and stall speed.
Airspeed Indicator
Airspeed
— Airspeed
0
(default) | finite, real, and scalar numeric
Airspeed value, specified as a finite, real, and scalar numeric, in knots. The airspeed value determines the airspeed of the aircraft.
If the value is less than the minimum
Limits
property value, then the needle points to a location immediately before the beginning of the scale.If the value is more than the maximum
Limits
property value, then the needle points to a location immediately after the end of the scale.
Example: 100
Limits
— Minimum and maximum airspeed indicator scale values
[40 400] (default) | two-element finite and real numeric array
Minimum and maximum gauge scale values, specified as a two-element numeric array. The first value in the array must be less than the second value, in knots.
If you change Limits
such that the Value
property is less than the new lower limit, or more than the new upper limit, then the
gauge needle points to a location off the scale.
For example, suppose Limits
is [0 100]
and
the Value
property is 20. If the Limits
changes to [50 100]
, then the needle points to a location off the
scale, slightly less than 50.
ScaleColors
— Scale colors
[ ] (default) | 1-by-n
string array | 1-by-n
cell array |
n
-by-3 array of RGB triplets | hexadecimal color code | ...
Scale colors, specified as one of the following arrays:
A 1-by-
n
string array of color options, such as["blue" "green" "red"]
.An
n
-by-3 array of RGB triplets, such as[0 0 1;1 1 0]
.A 1-by-
n
cell array containing RGB triplets, hexadecimal color codes, or named color options. For example,{'#EDB120','#7E2F8E','#77AC30'}
.
RGB triplets and hexadecimal color codes are useful for specifying custom colors.
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 character vector or a string scalar that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Thus, 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" |
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" |
Each color of the ScaleColors
array corresponds to a colored
section of the gauge. Set the ScaleColorLimits
property to map the
colors to specific sections of the gauge.
If you do not set the ScaleColorLimits
property, MATLAB distributes the colors equally over the range of the gauge.
ScaleColorLimits
— Scale color limits
[ ] (default) | n-by-2 array
Scale color limits, specified as an n-by-2 array of numeric values. For every row in
the array, the first element must be less than the second element. The first
ScaleColorLimits
value can overlap (see Display Flight Trajectory Data Using Flight Instruments and Flight Animation).
When applying colors to the gauge, MATLAB applies the colors starting with the first color
in the ScaleColors
array. Therefore, if two rows in
ScaleColorLimits
array overlap, then the color applied later
takes precedence.
The gauge does not display any portion of the ScaleColorLimits
that falls outside of the Limits
property.
If the ScaleColors
and ScaleColorLimits
property values are different sizes, then the gauge shows only the colors that have
matching limits. For example, if the ScaleColors
array has three
colors, but the ScaleColorLimits
has only two rows, then the gauge
displays the first two color/limit pairs only.
Value
— Airspeed
0
(default) | finite, real, and scalar numeric
Airspeed value, specified as a finite, real, and scalar numeric. The airspeed value determines the airspeed of the aircraft.
If the value is less than the minimum
Limits
property value, then the needle points to a location immediately before the beginning of the scale.If the value is more than the maximum
Limits
property value, then the needle points to a location immediately after the end of the scale.
Example: 100
Interactivity
Visible
— Visibility of airspeed indicator
'on'
(default) | on/off logical value
Visibility of the airspeed indicator, 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 airspeed indicator is
displayed on the screen. If the Visible
property is set to
'off'
, then the entire airspeed indicator 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 airspeed indicator
'on'
(default) | on/off logical value
Operational state of airspeed indicator, 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 indicator indicates that the indicator is operational.If you set this property to
'off'
, then the appearance of the indicator appears dimmed, indicating that the indicator is not operational.
Position
Position
— Location and size of airspeed indicator
[100 100 120 120]
(default) | [left bottom width height]
Location and size of the airspeed indicator 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 airspeed indicator |
bottom | Distance from the inner bottom edge of the parent container to the outer bottom edge of an imaginary box surrounding the airspeed indicator |
width | Distance between the right and left outer edges of the airspeed indicator |
height | Distance between the top and bottom outer edges of the airspeed indicator |
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 airspeed indicator
[100 100 120 120]
(default) | [left bottom width height]
Inner location and size of the airspeed indicator, 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 airspeed indicator
[100 100 120 120]]
(default) | [left bottom width height]
This property is read-only.
Outer location and size of the airspeed indicator 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 airspeed indicator in the third row and second column of its parent grid.
g = uigridlayout([4 3]); gauge = uiaeroairspeed(g); gauge.Layout.Row = 3; gauge.Layout.Column = 2;
To make the airspeed indicator span multiple rows or columns, specify the
Row
or Column
property as a two-element
vector. For example, this airspeed indicator 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
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.
Type
— Type of graphics object
'uiaeroairspeed'
This property is read-only.
Type of graphics object, returned as 'uiaeroairspeed'
.
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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