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Draw Widgets [message #6435]

Tue, 11 June 1996 00:00

Matthias Arnold
Messages: 2
Registered: June 1996

Junior Member

Is there a way to change the X_SCROLL_SIZE option
of a DRAW Widget that already exists?

I need this to interactively change the resolution of
the viewport to my scrollable plots.

WIDGET_CONTROL does not offer such a possibility, I guess.

Thanks for your help!

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* Matthias Arnold Klinikum der
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* Institut fuer Med. Statistik,
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Re: Draw Widgets [message #41709 is a reply to message #6435]

Mon, 22 November 2004 10:26

Benjamin Hornberger is currently offline

Benjamin Hornberger
Messages: 258
Registered: March 2004

Senior Member

Pravesh wrote:
> Hi all:
> I am building an interface to use some of the routines i wrote.
>
> The aim is to allow the user to click on the draw
> widget to select a specific pixel and then grow a
> region based on intensity of that pixel. How do we get
> the interface to supply the pixel co-ordinates to the program? it
> seems tricky to achieve it.. i am using david's info structure...

Maybe this is what you are looking for: Set the /button_events keyword
when creating the draw widget (or set the /draw_button_events to
widget_control later). Then the draw widget will create events when you
click your mouse into it. The pixel coordinates are available via
event.x and event.y. If you want to distinguish between left and right
mouse button, press and release, etc., read "Widget Events Returned by
Draw Widgets" in the online help for "widget_draw".

Benjamin

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