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Re: Widget_draw coordinates? [message #44948]

Fri, 29 July 2005 10:21

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

b_efremova@yahoo.com writes:

> Can somebody tell me how can I obtain x and y coordinates in data
> units, when using the widget_draw.
> The events have X and Y fields, but their values are only in pixels
> or inches, and I don't see an option for them to be in the data
> coordinate units.

c = Convert_Coord(event.x, event.y, /Device, /To_Data)
x = c[0,0]
y = c[1,0]

Just be sure you *have* a data coordinate system established
when you do the conversion! Typically, you save !X, and !Y
from a PLOT command and restore them before the conversion
takes place. Or, this occurs just after a PLOT, CONTOUR,
SURFACE, etc.

!X = info.bang_x
!Y = info.bang_y
c = Convert_Coord(event.x, event.y, /Device, /To_Data)
x = c[0,0]
y = c[1,0]

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Widget_draw coordinates? By: David Fanning on Fri, 29 July 2005 10:21
		Re: Widget_draw coordinates? By: b_efremova@yahoo.com on Fri, 29 July 2005 11:01
		Re: Widget_draw coordinates? By: David Fanning on Fri, 29 July 2005 10:42

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