ITT Rule IDL Version 7.0 User Manual download pdf (Page 370)

370 Chapter 15: Creating a Custom iTool Widget Interface

Example: a Custom iTool Interface iTool Developer’s Guide

; Set the COLOR property on the plot line and commit the change.

void = (*pState).oTool->DoSetProperty(plotID, 'COLOR', $

newcolor)

(*pState).oTool->CommitActions

END

Discussion

This routine uses the same technique as the draw_plot_event routine to ensure that

our iTool is the current tool. It then retrieves the identifier of the plot line, ensures

that the line itself is selected, and sets the COLOR property on the line. For additional

information on retrieving component identifiers and changing property values, see

Appendix A, “Controlling iTools from the IDL Command Line”.

filter_event

The filter_event routine is specified as the event handler for the “Filter this Plot”

button in the custom section of the interface. The complete code for this event-

handler routine is shown below.

PRO filter_event, event

; Retrieve a pointer to the state structure.

wChild = WIDGET_INFO(event.top, /CHILD)

WIDGET_CONTROL, wChild, GET_UVALUE = pState

; Get the iTool identifier and make sure our iTool

; is the current tool.

toolID = (*pState).oTool->GetFullIdentifier()

ITCURRENT, toolID

; Select the first plot line visualization in the window.

; There should be only one line, but we select the first one

; just to be sure. Also retrieve the identifier for the Median

; filter operation.

plotID = (*pState).oTool->FindIdentifiers('*plot*', $

/VISUALIZATIONS)

medianID = (*pState).oTool ->FindIdentifiers('*median', $

/OPERATIONS)

plotObj = (*pState).oTool->GetByIdentifier(plotID[0])

plotObj->Select

; Apply the Median filter operation to the selected plot line

; and commit the change.

void = (*pState).oTool->DoAction(medianID)

(*pState).oTool->CommitActions

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ITT Rule IDL Version 7.0 User Manual Page 370