ITT Rule IDL Version 7.0 User Manual download pdf (Page 44)

44 Chapter 2: iTool System Architecture

System Resources iTool Developer’s Guide

System Resources

This section contains information on resources used by the iTool system.

Icon Bitmaps

Some iTool components have associated icons. Icons for iTool components are

displayed in the tree view of a browser window.

Bitmaps used as icons in the iTool system must be either

.bmp or .png files. The

images contained in icon bitmap files can be either True Color (24-bit color) images

or paletted (8-bit color) images.

Note

There are different requirements for bitmap images that will be displayed on button

widgets. See “Using Button Widgets” (Chapter 4, Widget Application

Programming) for details.

By default, bitmap files for icons used by the iTool system are stored in the

bitmaps

subdirectory of the

resource subdirectory of the IDL distribution. If an icon’s

bitmap file is located in this directory, specify the base name of the file — without the

filename extension — as the value of the ICON property of the component. For

example, to use the file

arrow.bmp, located in the resource/bitmaps

subdirectory of the IDL distribution, specify the value of the ICON property as

follows:

ICON = 'arrow'

If you include the filename extension when setting the ICON property, the iTool

system assumes that the specified value is the full path to the bitmap file. For

example, to use the file

my_icon.png, stored in the directory /home/mydir as an

icon, specify the value of the ICON property as follows:

ICON = '/home/mydir/my_icon.png'

If you are distributing your iTool code to others, you may want to specify a path

relative to the location of your code for the icon bitmap files. To retrieve the path to

the file containing code for a given routine, you could use code similar to the

following:

; Use my own Icon bitmap

iconName = 'my_icon.png'

routineName = 'myVisualizationType__define'

routineInfo = ROUTINE_INFO(routineName, /SOURCE)

path = FILE_DIRNAME(routineInfo.path, /MARK_DIRECTORY)

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ITT Rule IDL Version 7.0 User Manual Page 44