Re: [Plplot-devel] plGetCursor() return value (was Should plgetpos ...)

[Joao C. <jc...@fe...>]

On Wednesday 27 February 2002 04:07, Alan W. Irwin wrote:
| I would appreciate further discussion of one aspect of the
| plTranslateCursor code.
|
| It goes through a reversed list of windows (I assume these are
| sub-windows?) and for the first one where the cursor is inside the
| sub-window it does the transformation and returns.
|
| If I have this interpretation right, then it looks like the pyqt
| group's plgetpos using data in the PLStream struct won't really
| work since on a page with subwindowing, the world coordinates can
| vary wildly form sub-window to sub-window (e.g., example 1), and
| their code doesn't take account of this.  So my guess is they are
| going to be forced (by example 1) to go to the plTranslateCursor
| type of transformation.

One problem with plGetCursor() is that it doesn't give information on=20
which sub-page the mouse event occurred. I always found this a=20
serious limitation.

Perhaps using the "i" variable as the return value from=20
plGetCursor()? of course existing code that relies on a "1" to be=20
returned would fail, but I guess that most code is just checking for=20
a zero/non-zero return value. An advantage of this approach is that=20
it wouldn't break API compatibility.

Joao

|
| Do you agree?
|
| Alan
|
| email: ir...@be...
| phone: 250-727-2902=09FAX: 250-721-7715
| snail-mail:
| Dr. Alan W. Irwin
| Department of Physics and Astronomy,
| University of Victoria, P.O. Box 3055,
| Victoria, British Columbia, Canada, V8W 3P6
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