ITT Rule IDL Version 7.0 Bedienungsanleitung PDF herunterladen (Seite 368)

368 Chapter 15: Creating a Custom iTool Widget Interface

Example: a Custom iTool Interface iTool Developer’s Guide

; Call IPLOT to create a plot of random values, replacing the

; data used in the iTool's window.

IPLOT, RANDOMU(seed, points), THICK=linesize, $

COLOR=newcolor, VIEW_NUMBER=1

END

Discussion

This routine uses mostly standard widget programming techniques. Two points are

worth noting, however:

1. We must be sure that our iTool is set as the current tool. To do this, we retrieve

our iTool’s identifier using the object reference stored in the widget interface’s

state structure and the GetFullIdentifier method. Next, we use the

ITCURRENT routine with the full identifier to make sure our tool is current.

2. When we call the IPLOT routine to generate the new plot, we set the

VIEW_NUMBER keyword equal to 1 (one). This replaces the data in the first

(and in our case, only) view in the tool with the data specified.

linesize_event

The linesize_event routine is specified as the event handler for the Line Size droplist

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

routine is shown below.

PRO linesize_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

; Get the value of the line size droplist.

linesize = WIDGET_INFO((*pState).wLineSize, /DROPLIST_SELECT)+1

; 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.

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

/VISUALIZATIONS)

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

plotObj->Select

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ITT Rule IDL Version 7.0 Bedienungsanleitung Seite 368