ITT Rule IDL Version 7.0 User Manual download pdf (Page 140)

140 Chapter 6: Creating a Visualization

Example: Image-Contour Visualization iTool Developer’s Guide

Example: Image-Contour Visualization

This example creates a visualization type named example1_visImageContour

that displays an image and overlays it with a contour based on the image data.

Example Code

The code for this example visualization type is included in the file

example1_visimagecontour__define.pro in the examples/doc/itools

subdirectory of the IDL distribution. Run the example procedure by entering

example1_visimagecontour__define at the IDL command prompt or view

the file in an IDL Editor window by entering

.EDIT

example1_visimagecontour__define.pro.

Class Definition File

The class definition for example1_visImageContour consists of an Init method,

an OnDataChangeUpdate method, and a class structure definition routine. Other

important methods — Cleanup, GetProperty, and SetProperty — are handled by the

superclass (

IDLitVisualization).

As with all object class definition files, the class structure definition routine is the last

routine in the file, and the file is given the same name as the class definition routine

(with the suffix

.pro appended).

Class Definition

PRO example1_visImageContour__define

struct = { example1_visImageContour, $

inherits IDLitVisualization, $

_oContour: OBJ_NEW(), $

_oImage: OBJ_NEW() $

}

END

Discussion

Our class definition routine creates an IDL structure variable with the name

example1_visImageContour, specifying that the structure inherits from the

IDLitVisualization class. The structure has two instance data fields named

_oContour and _oImage, which will contain object references to the

IDLitVisImage and IDLitVisContour objects that make up the

example1_visImageContour visualization.

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ITT Rule IDL Version 7.0 User Manual Page 140