When writing a custom task, you can choose to display a dialog that lets the end user select input and output parameters for ENVITasks. This topic describes various user interface (UI) elements that you can add to dialogs.

In a style sheet, set the type key to one of these UI elements. For example:

"parameters": [
     {
       "name": "raster_filename",
       "type": "IDLLabel_UI"
     }

Some elements have keywords that let you display specific options for the end user to choose. These are described in each section below. For example:

"name": "raster_filename",
"type": "IDLList_UI",
"keywords": {
      "OPTIONS": ['Band 1', 'Band 2', 'Band 3', 'Band 4']
 }

    Or:

"name": "raster_filename",
"type": "ENVIRaster_UI",
"keywords": "MULTIPLE"

To see a preview of a UI element, pass it to the ENVIUI::CreateFromDialog method. You can also set keywords on some elements, as this example shows:

e = ENVI()
UI = e.UI
element = IDLList_UI(OPTIONS=['Band 1', 'Band 2', 'Band 3', 'Band 4'])
result = UI.CreateFromDialog(element)

ENVI Elements

The following UI elements are unique to the ENVI interface. They are listed in alphabetical order.

 

Type

ENVIColorMap_UI

Description

Choose a color table.

Keywords

None

Example

Return Value

A color table, for example:

BLUE                      = 66,          67,          67,          68,          68,          ...
GREEN                     = 1,           3,           6,           8,          11,          ...
PALETTE                   = 158,           1,          66,         160,           3, ...
RED                       = 158,         160,         162,         165,         167,         ...

 

Type

ENVIColorMapName_UI

Description

Set a color table name.

Keywords

None

Example

Return Value

A color table name, for example:

CB-Spectral

Type

ENVIColorTable_UI

Description

Select a predefined or custom color table.

Keywords

None

Example

Return Value

A 256 x 3 array of RGB values that define the color table

 

Type

ENVICoordSys_UI

Description

Enter parameters for a coordinate system. You can use the coordinate system from an existing dataset or from the current view. Or, click the button to display the Select Coordinate System dialog.

Keywords

None

Example

Return Value

An ENVICoordSys object, for example:

ENVICOORDSYS <253938>
  COORD_SYS_CODE            = 0
  COORD_SYS_STR             = 'PROJCS["NAD_1983_UTM_Zone_13N",
  GEOGCS["GCS_North_American_1983",
  DATUM["D_  North_American_1983",
  SPHEROID["GRS_1980",6378137.0,298.257222101]],
  PRIMEM  ["Greenwich",0.0],
  UNIT["Degree",0.0174532925199433]],
  PROJECTION["Transverse_Mercator"],
  PARAMETER["False_Easting",500000.0],
  PARAMETER["False_Northing",0.0],
  PARAMETER["Central_Meridian",-105.0],
  PARAMETER["Scale_Factor",0.9996],
  PARAMETER["Latitude_Of_Origin",0.0],
  UNIT["Meter",1.0]]'

 

Type

ENVICoordSysString_UI

Description

This is similar to ENVICoordSys_UI but is meant for capturing a coordinate system string.

Keywords

None

Example

Return Value

A coordinate system string, for example:

PROJCS["NAD_1983_UTM_Zone_13N",
GEOGCS["GCS_North_American_1983",
DATUM["D_North_American_1983",
SPHEROID["GRS_1980",6378137.0,298.257222101]],
PRIMEM["Greenwich",0.0],
UNIT["Degree",0.0174532925199433]],
PROJECTION["Transverse_Mercator"],
PARAMETER["False_Easting",500000.0],
PARAMETER["False_Northing",0.0],
PARAMETER["Central_Meridian",-105.0],
PARAMETER["Scale_Factor",0.9996],
PARAMETER["Latitude_Of_Origin",0.0],
UNIT["Meter",1.0]]

 

Type

ENVIFeatureCount_UI

Description

Select an ENVI Feature Counting file.

Keywords

None

Example

Use this dialog to select an ENVI Feature Counting file (.efc).

Return Value

An ENVIFeatureCount object that contains the URI to the .efc file; for example:

ENVIFEATURECOUNT <285284>
  URI: C:\MyData\Buildings.efc

 

Type

ENVIGCPSet_UI

Description

Select an ENVI Ground Control Point (GCP) file.

Keywords

None

Example

Use this dialog to select an ENVI GCP file (.pts).

Return Value

An ENVIGCPSet object, for example:

ENVIGCPSET <297131>
COORD_SYS_CODE            = 32612
COORD_SYS_STR             = 'PROJCS["WGS_1984_UTM_Zone_12N",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",500000.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",-111.0],PARAMETER["Scale_Factor",0.9996],PARAMETER["Latitude_Of_Origin",0.0],UNIT["Meter",1.0]]'
 
Total GCPs:          14
 
0:	{408620.650000	3698081.000000	314.977000	4365.000000	   446.000000	}
1:	{406652.050000	3698011.500000	311.083000	3568.000000	   478.000000	}
etc...

 

Type

ENVIGridDefinition_UI

Description

Create a grid definition.

Keywords

None

Example

Return Value

An ENVIGridDefinition object, for example:

ENVIGRIDDEFINITION <256169>
  EXTENTS                   = -111.25000,       42.000000,      -110.25000,       40.000000
  NCOLUMNS                  = 2
  NROWS                     = 4
  SPATIALREF                = <ObjHeapVar256172 (ENVISTANDARDRASTERSPATIALREF)>

 

Type

ENVIPointCloud_UI

Description

Select a LAS-format point cloud file.

Keywords

None

Example

Use this dialog to select a point cloud file in LAS format.

Return Value

An ENVIPointCloud object, for example:

ENVIPOINTCLOUD <264406>
  DATA_RANGE                = 593741.00,       5289518.0,       334.01000...
  DIRECT_READ               = 0
  NPOINTS                   = 6459297
  ...

 

Type

ENVIPointCloudSpatialRef_UI

Description

Enter parameters for a spatial reference object that applies to ENVI point clouds.

Keywords

None

Example

Use this dialog to select a point cloud spatial reference.

Return Value

An ENVIPointCloudSpatialRef object

 

Type

ENVIPseudoRasterSpatialRef_UI

Description

Enter parameters for a pseudo spatial reference.

Keywords

None

Example

Return Value

An ENVIPseudoRasterSpatialRef object, for example:

ENVIPSEUDORASTERSPATIALREF <257560>
  COORD_SYS_CODE            = 0
  COORD_SYS_STR             = 'GEOGCS["GCS_WGS_1984",
    DATUM["D_WGS_1984",
    SPHEROID["WGS_  1984",6378137.0,298.257223563]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]'
  PSEUDO_GEO_POINT_1        = 1.0000000,       1081.0000,      -104.85106,       41.122305
  PSEUDO_GEO_POINT_2        = 1.0000000,       2.0000000,      -104.84909,       41.120901
  PSEUDO_GEO_POINT_3        = 1920.0000,       1081.0000,      -104.85306,       41.120868
  PSEUDO_GEO_POINT_4        = 1920.0000,       2.0000000,      -104.85129,       41.119311

 

Type

ENVIRaster_UI

Description

Select an image that is in ENVI raster format.

Keywords

MULTIPLE: Set this keyword to allow the user to select more than one raster.

DISABLE_SUB_RECT: Set this keyword to disable spatial subsetting from the Data Selection dialog.

DISABLE_BANDS: Set this keyword to disable spectral subsetting from the Data Selection dialog.

DISABLE_MASK: Set this keyword to disable selecting an input mask from the Data Selection dialog.

Example

Example with MULTIPLE keyword set:

Return Value

An ENVIRaster object or array of ENVIRaster objects, for example:

ENVIRASTER <349142>
  AUXILIARY_SPATIALREF      = !NULL
  AUXILIARY_URI             = <Array[2]>
  DATA_TYPE                 = 'uint'
  etc.

 

Type

ENVIROI_UI

Description

Select one or more regions of interest (ROIs) that have already been opened in ENVI.

Keywords

MULTIPLE: Set this keyword to allow the user to select more than one ROI.

Example

Example with MULTIPLE keyword set:

Return Value

An ENVIROI object or array of ENVIROI objects, for example:

<ObjHeapVar379877(ENVIROI)>

 

Type

ENVIRPCRasterSpatialRef_UI

Description

Enter parameters for an RPC spatial reference.

Keywords

None

Example

Return Value

An ENVIRPCRasterSpatialRef object, for example:

ENVIRPCRASTERSPATIALREF <437975>
COORD_SYS_CODE            = 0
COORD_SYS_STR             = 'GEOGCS["GCS_WGS_1984",
  DATUM["D_WGS_1984",
  SPHEROID["WGS_1984",6378137.0,298.257223563]],
  PRIMEM["Greenwich",0.0],
  UNIT["Degree",0.0174532925199433]]'
RPC_LINE_DEN_COEFF        = 1.0000000,  6.4645428e-006,   0.00052790839,      0.00000000,  ...
RPC_LINE_NUM_COEFF        = 0.0010621439,    -0.013044900,      -1.0119801,      0.00000000, ...
RPC_OFFSETS               = 3736.0000,       1650.0000,       51.571200,       113.03300,       762.00000
RPC_SAMP_DEN_COEFF        = 1.0000000,  -0.00055341510,   0.00096132292,      0.00000000, ...
RPC_SAMP_NUM_COEFF        = 0.0010625550,       1.0621670,    -0.063717522,      0.00000000, ...
RPC_SCALES                = 3736.0000,       1650.0000,     0.081600000,     0.060700000,       500.00000

 

Type

ENVIStandardRasterSpatialRef_UI

Description

Enter parameters for a standard spatial reference.

Keywords

None

Example

Return Value

An ENVIStandardRasterSpatialRef object, for example:

ENVISTANDARDRASTERSPATIALREF <381116>
COORD_SYS_CODE            = 0
COORD_SYS_STR             = 'PROJCS["UTM_Zone_13N",
  GEOGCS["GCS_WGS_1984",
  DATUM["D_WGS_1984",
  SPHEROID["WGS_1984",6378137.0,298.257223563]],
  PRIMEM["Greenwich",0.0],
  UNIT["Degree",0.0174532925199433]],
  PROJECTION["Transverse_Mercator"],
  PARAMETER["False_Easting",500000.0],
  PARAMETER["False_Northing",0.0],
  PARAMETER["Central_Meridian",-105.0],
  PARAMETER["Scale_Factor",0.9996],
  PARAMETER["Latitude_Of_Origin",0.0],
  UNIT["Meter",1.0]]'
PIXEL_SIZE                = 2.8000000,       2.8000000
ROTATION                  = 0.00000000
TIE_POINT_MAP             = 480267.20,       4428978.4
TIE_POINT_PIXEL           = 0.00000000,      0.00000000

 

Type

ENVITiePointSet_UI

Description

Select an ENVI tie point file. The header in this file must reference the locations of two input rasters.

Keywords

None

Example

Use this dialog to select an ENVI tie point file (.pts).

Return Value

An ENVITiePointSet object, for example:

URI                       = C:\MyData\SampleTiePoints.pts
INPUT_RASTER1             = <ObjHeapVar332386(ENVIRASTER)>
INPUT_RASTER2             = <ObjHeapVar333409(ENVIRASTER)>
 
Total Tie Points: 104
0:    {        229.994797       1078.083374        502.200623        817.015991  }
1:    {        939.005188        283.916656        932.200623        326.640991  }
etc...

 

Type

ENVITime_UI

Description

Enter the acquisition date and time for a dataset.

Keywords

None

Example

Return Value

An ENVITime object, for example:

ENVITIME <437990>
ACQUISITION               = '2016-08-04T12:18:23Z'
UNIX_MILLISECONDS         = 1470313103000
UNIX_SECONDS              = 1470313103

 

Type

ENVITimeString_UI

Description

This is similar to ENVITime_UI but is meant for capturing an acquisition time string.

Keywords

None

Example

Return Value

An acquisition time string, for example:

2016-08-04T12:20:09Z

 

Type

ENVITimeWheel_UI

Description

This is similar to ENVITime_UI but has a wheel control to reduce the number of clicks.

Keywords

None

Example

Return Value

An ENVITime object, for example:

ENVITIME <444818>
ACQUISITION               = '1995-01-15T21:00:00Z'
UNIX_MILLISECONDS         = 790203600000
UNIX_SECONDS              = 790203600

 

Type

ENVIURI_UI

Description

Select a file and record its uniform resource indicator (URI). The URI contains the full path and filename for the selected file.

Keywords

FILTER: Set this keyword to allow filtering of file types.

MULTIPLE: Set this keyword to allow the user to select more than one file.

Example

Example with MULTIPLE keyword set:

Return Value

A URI string or an array of URI strings, for example:

C:\Data\envi.json

 

Type

ENVIVector_UI

Description

Select a supported vector file.

Keywords

MULTIPLE: Set this keyword to allow the user to select more than one vector file.

Example

Example with the MULTIPLE keyword set:

Return Value

An ENVIVector object or array of ENVIVector objects, for example:

ENVIVECTOR <568229>
AUXILIARY_URI             = <Array[6]>
COORD_SYS                 = <ObjHeapVar568250(ENVICOORDSYS)>
DATA_RANGE                = -158.17646,       19.702482,      -68.783012,       64.848302
RECORD_TYPE               = 'Point'
URI                       = 'INSTALL_DIR\ENVIxx\classic\data\vector\cities.shp'

IDL Elements

The following are generic UI elements that map to other IDL variable types.

Type

IDLAddRemoveList_UI

Description

Select any number of strings from a list.

Keywords

OPTIONS: Set this keyword to a string array with the options to display in the list.

Example

Return Value

A string array of items in the list, for example:

Unclassified
Class 1
Class 2
Class 3

 

Type

IDLAddRemoveReorderList_UI

Description

This is similar to AddRemoveList_UI but also lets the user reorder selected items.

Keywords

OPTIONS: Set this keyword to a string array with the options to display in the list.

Example

Return Value

A string array of items in the list, for example:

Unclassified
Class 1
Class 2
Class 3

 

Type

IDLBool_UI

Description

Select to perform an action or not.

Keywords

LABEL_0: Set this keyword to a string label for the first option.

LABEL_1: Set this keyword to a string label for the second option.

Example

Return Value

Returns a Boolean value of true or false.

 

Type

IDLBoundingBox_UI

Description

Define a bounding box using latitude/longitude coordinates.

Keywords

None

Example

Return Value

A double-precision, four-element array of coordinates, for example:

-111.0078  23.686523  -102.802132  39.339024

 

Type

IDLCheckBoxes_UI

Description

Create a set of buttons for the user to choose from. The buttons are non-exclusive (multiple items can be selected).

Keywords

COLUMN: Set this keyword to true to arrange the buttons in a column (vertically). The default is horizontal arrangement.

OPTIONS: Set this keyword to an array with the options to display.

Example

Return Value

An array with the selected items.

 

Type

IDLColorEditTree_UI

Description

Edit the colors of pre-defined classes.

Keywords

Option 1: Set the OPTIONS keyword to strings with class names, and set the VALUE keyword to RGB color triplet values.

Option 2 (shown below): Set the VALUE keyword to a hash with class names for the keys and RGB color triplets for the values.

Example 

a = ORDEREDHASH( $
  'Unclassified', [0b, 0, 0], $
  'Class 1', [255b, 0, 0], $
  'Class 2', [0b, 255, 0], $
  'Class 3', [0b, 0, 255])
result = UI.CreateFromDialog(IDLColorEditTree_UI(value=a))

Return Value

A (3, n) byte array with RGB color triplets of each class, for example:

0     0   0
255   0   0
0     255 0
0     0   255

 

Type

IDLColor_UI

Description

Choose a standard or custom color.

Keywords

None

Example

Return Value

A three-element byte array that represents an RBB color triplet, for example:

150  6  220

 

Type

IDLColorTableName_UI

Description

Choose a color table using radio buttons.

Keywords

None

Example

Return Value

A string with the name of a color table, for example:

Blue-Red

 

Type

IDLComplexNumber_UI or IDLDoubleComplexNumber_UI

Description

Enter a complex or double-complex number (with real and imaginary components).

Keywords

None

Example

Return Value

A complex or double-complex array with real and imaginary components, for example:

(    -1.5000000,    3.5000000)

Type

IDLContainer_UI

Description

This is a container that holds multiple UI classes so that they can be displayed at once (for example, in a workflow).

Keywords

CAN_TOGGLE: Set this keyword to display a check box that lets users choose to show or hide groups of smaller UI classes. See IDLContainer_UI Examples.

COLUMN: Set this keyword to place all UI classes in one column.

FRAME: Set this keyword to put a frame around the container.

ROW: Set this keyword to place all UI classes in one row.

TOGGLE_LABEL: Set this keyword to a string with a label for a group of UI classes, when the CAN_TOGGLE keyword is set. The default value is "Show Parameters."

Example

See IDLContainer_UI Examples. Also see the workflow examples in Custom User Interface Classes.

Return Value

An instance of the IDLContainer_UI class:

{
"raster": "<ObjHeapVar240325(ENVIRASTER_UI)>",
"vector": "<ObjHeapVar240337(ENVIVECTOR_UI)>"
}

 

Type

IDLDropList_UI

Description

Select an option from a drop-down list.

Keywords

OPTIONS: Set this keyword to a string array with the options to display in the list.

Example

Return Value

A string with the selected value, for example:

Water

 

Type

IDLEditableDropList_UI

Description

Select an option from a drop-down list, or enter a different option by typing it.

Keywords

OPTIONS: Set this keyword to a string array with the options to display in the list.

REMEMBER_VALUES_ID: Set this keyword to a string with a unique identifier for saving previous values selected by the user (up to a maximum of 15). These values will populate the drop-down list the next time this UI class is used, as long as it is created with the same string in the REMEMBER_VALUES_ID keyword.

Example

Return Value

A string with the selected value, for example:

Water

 

Type

IDLEditableList_UI

Description

Edit the items in a list.

Keywords

OPTIONS: Set this keyword to a string array with the options to display in the list.

Example

Return Value

A string array with the updated list, for example:

Band 1
Band 2
Band 3
Band 466
Band 5

 

Type

IDLHidden_UI

Description

Use this class to hide parameters in a custom task.

Keywords

None

Example 

PARAMETER

Return Value

A value of hidden in the task file

 

Type

IDLKernel_UI

Description

Define a kernel array for filtering operations.

Keywords

TYPE: Specify an IDL numeric data type: byte, int, long, float, double, complex, dcomplex, uint, ulong, long64, ulong64.

Example

Return Value

An array [columns, rows] representing the kernel, for example:

1  1  1
1  1  1
1  1  1

 

Type

IDLLabel_UI

Description

Use this with custom tasks only. Enter a text label that cannot be edited. For example, display the name of an input raster that the user cannot change.

Keywords

None

Example

Return Value

The text label, for example:

qb_boulder_msi

 

Type

IDLList_UI

Description

Create a list of options for a user to select, either individually or more than one using the Ctrl or Shift key.

Keywords

MULTIPLE: Set this keyword to true to allow selection of more than one element in the list. This is the default behavior.

OPTIONS: Set this keyword to a string array with the options to display in the list.

Example

Return Value

A string array with the selected items, for example:

Band 1
Band 3

 

Type

IDLMultiString_UI

Description

Enter multiple strings.

Keywords

None

Example

Return Value

A string array, for example:

Demo QuickBird 2 data courtesy
DigitalGlobe, Inc. Not for commerical
use.

 

Type

IDLNumeric_UI

Description

Enter a numeric value.

Keywords

TYPE: Specify an IDL numeric data type: byte, int, long, float, double, complex, dcomplex, uint, ulong, long64, ulong64.

Example

Return Value

The numeric value, for example:

10.002000

 

Type

IDLNumericColsRows_UI

Description

Define the number of columns and rows for a raster.

Keywords

None

Example

Return Value

A two-element integer array, for example:

123  234

 

Type

IDLNumericPair_UI

Description

Enter a pair of numeric values.

Keywords

TYPE: Specify an IDL numeric data type: byte, int, long, float, double, complex, dcomplex, uint, ulong, long64, ulong64.

LABEL_1: Set this keyword to a string label for the first field.

LABEL_2: Set this keyword to a string label for the second field.

COLUMN: Set this keyword to display the pair in a column. The default is to display them in a row.

Example 

pair = numericpair_UI(TYPE='double', LABEL_1='Gain', LABEL_2='Offset', COLUMN=2)

Return Value

A two-element array of numeric values, for example:

0.0010000000000000000  0.00000000000000000

 

Type

IDLOrderedHash_UI and IDLHash_UI

Description

Create an IDL hash or ordered hash with values that the user can edit.

Keywords

None

Example

Example of an unordered hash:

h = HASH( $
  "Band 1", 405.0, $
  "Band 2", 520.0, $
  "Band 3", 690.0, $
  "Band 4", 1273.0)
result = UI.CreateFromDialog(IDLHash_UI(value=h))

Example of an ordered hash:

h = ORDEREDHASH( $
  "Band 1", 405.0, $
  "Band 2", 520.0, $
  "Band 3", 690.0, $
  "Band 4", 1273.0)
result = UI.CreateFromDialog(IDLOrderedHash_UI(value=h))

Return Value

The hash key/value pairs, for example:

{
"Band 1": 405.00000,
"Band 2": 520.00000,
"Band 3": 690.00000,
"Band 4": 1270.0000
}

 

Type

IDLPassword_UI

Description

Display a dialog for entering a password with hidden characters.

Keywords

None

Example

Return Value

A string with the entered password.

 

Type

IDLRadioButtons_UI

Description

Create a set of buttons for the user to choose from. The buttons are exclusive (only one item can be selected).

Keywords

COLUMN: Set this keyword to true to arrange the buttons in a column (vertically). The default is horizontal arrangement.

OPTIONS: Set this keyword to an array with the options to display.

Example

Return Value

A scalar with the selected item.

 

Type

IDLRGBBandSelection_UI

Description

Select which bands to assign to red, green, and blue.

Keywords

OPTIONS: Set this keyword to a string array of band names.

Example

Return Value

A long array with the selected bands, for example:

2   1   3

 

Type

IDLRGBGrayScaleBandSelection_UI

Description

Similar to IDLRGBBandSelection_UI but also provides a Grayscale option.

Keywords

OPTIONS: Set this keyword to a string array of band names.

Example

Return Value

An array of the selected bands, for example:

1

 

Type

IDLSearchList_UI

Description

Create a list of options for a user to select, either individually or more than one using the Ctrl or Shift key. The UI contains a search box to filter the items in the list. This is useful when the list contains a large number of items.

Keywords

MULTIPLE: Set this keyword to true to allow selection of more than one element in the list. This is the default behavior.

OPTIONS: Set this keyword to a string array with the options to display in the list.

Example

Return Value

A string array with the selected items, for example:

Generate Tie Points By Cross Correlation...
Generate Tie Points By Mutual Information...
RPC Orthorectification
RPC Orthorectification Using Reference Image

 

Type

IDLSlider_UI

Description

Use a slider to select a numeric value. Set the MAX and MIN properties in the parameter that is associated with this UI element.

Keywords

INCREMENT: Set this keyword to the increment value of the slider.

Example

Return Value

A floating-point value, for example:

231.000000

 

Type

IDLString_UI

Description

Enter a text string.

Keywords

None

Example

Return Value

A text string, for example:

Enter text here

 

Type

IDLSubRect_UI

Description

Enter X and Y pixel or map coordinates that define a spatial subset.

Keywords

LABEL_X: Set this keyword to a string for the X coordinate label.

LABEL_Y: Set this keyword to a string for the Y coordinate label.

TYPE: Set this keyword to a string with the IDL data type of the coordinates (for example, 'float' or 'int'). The default type is ULong (unsigned integer).

Example

Return Value

A numeric array of coordinate values, for example:

512   512   1024   1024

 

Type

IDLTree_UI

Description

Create a list of options for a user to select, either individually or more than one using the Ctrl or Shift key.

Keywords

OPTIONS: Set this keyword to a string array with the options to display in the tree.

MULTIPLE: Set this keyword to allow the user to select more than one item in the tree.

Example

Return Value

A string or string array of the selected items, for example:

Band 1
Band 3

 

Type

IDLWheel_UI

Description

Use a wheel control to select a numeric value.

Keywords

None

Example

Return Value

A floating-point value, for example:

3.0000000