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Re: IDLgrWindow Setting - Why render image gets erased? [message #46117 is a reply to message #46108]

Tue, 01 November 2005 08:02

Karl Schultz
Messages: 341
Registered: October 1999

Senior Member

On Mon, 31 Oct 2005 17:06:17 -0800, Victor wrote:

> Hi all,
>
> After swimming through IDL Documentation and messg boards, I couldn't
> find an answer to the following (and I'm surprized this hasn't been
> discussed .. or maybe I couldn't find it - it looks fundamental)
>
> # When you render an image in IDLgrWindow object, then if you try to
> maximize the window/resize (interactively with mouse clicks), the image
> disappears.
>
> Thanks in advance
> - Victor
>
> P.S. Setting RETAIN = 2 helps with leaving the image rendered if you
> switch between windows, however, doesn't solve the above problem.

IDLgrWindow is a low-level window object that you must draw explicitly.
This includes the initial draw as well as handling any sort of event that
happens to the window, such as a resize. In the case of a resize, you
generally have to at least call the Draw method again so that the
IDLgrWindow can update the window on the screen after the resize.

But IDLgrWindow is the lowest-level window object provided by IDL. There
are several other objects and tools that are higher-level and smarter:

Widgets (WIDGET_DRAW)
IDLitWindow
XOBJVIEW
iTools

Few applications exist that use stand-alone IDLgrWindow objects for
display. Most applications use WIDGET_DRAW and widget application
architecture to manage the graphics windows.

Karl

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[Message index]

		Re: IDLgrWindow Setting - Why render image gets erased? By: Mark Hadfield on Tue, 01 November 2005 17:17
		Re: IDLgrWindow Setting - Why render image gets erased? By: Victor[1] on Tue, 01 November 2005 15:00
		Re: IDLgrWindow Setting - Why render image gets erased? By: Karl Schultz on Tue, 01 November 2005 08:02
		Re: IDLgrWindow Setting - Why render image gets erased? By: David Fanning on Mon, 31 October 2005 18:23

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