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| From: | MON KEY |
| Subject: | Re: Drawing in images? |
| Date: | Mon, 28 Sep 2009 20:31:13 -0400 |
While examining dragbox2.el it occurred to me that an alternative way to
set a crop would be to use emacs window... er actually 5 windows!
68.
_________________________________________________________________
| ! | |
| window1 ! | window4 |
| ! | |
| ! | |
| \|/ | |
|---------------------------------------------------| |
| | /!\ | |
| | ! | |
| | Y-axis ! | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | window5 ! | |
|~~~~~~~~~~>|<~~~~~~~~~~~~~~~~+~~~~~~~~~~~~~~~~~~~~>|<~~~~~~~~~~~~|
| | ! X-axis | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | ! | |
| | \!/ | |
| |-----------------------------------------------------|
| | /!\ window3 |
| | ! |
| | ! |
| | ! |
| window2 | ! |
|___________|_________________|___________________________________|
68^
* Assume that the image to be cropped/bounded is in window5.
* Assume that all windows have a ~1-3 pixel border.
* Assume that window1, window2, window3, window4 can _only_ be
expanded contracted
on the axis indicated.
* Assume that window 5 is the only window that can be
expanded/contracted on both axis.
* Assume use of a library such as Drew Adams' DoReMi or equivalent.
* Assume Y-axis -> Up/Down expansion/contraction
* Assume X-axis -> Left/Right expansion/contraction
Window1 can expand/contract only along the Y-axis
Window2 can expand/contract only along the X-axis
Window3 can expand/contract only along the y-axis
Window4 can expand/contract only along the X-axis
Window5 can expand/contract along both the X-axis and Y-axis.
Window5 can recenter/reset the image along both the X-axis and Y-axis.
Shouldn't `posn-object-width-height', `posn-window', `posn-area' etc.
get one reasonably accurate pixel coardinates for a crop?
If so, doesn't this give us visual feedback without need of external calls, SVG
overlays, GTK wonkery etc.?
Also, a novel idea for doing image rotation using artist.el
as influenced by Unpaper's "Virtual Bar":
(URL `http://unpaper.berlios.de/img/deskew-detail1.png')
(URL `http://unpaper.berlios.de/img/deskew-detail2.png')
Which skews an image against a "Virtual Line" by calculating the skew against
some baseline (x-axis, y-axis, both) i.e. the radian as the virtual line's
deviation from "square".
Emacs window (preferably in a dedicated frame)
+--------------------------------------------------------60.
| |
| +-----------------------------------------------+ |
| | . | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / <-Virtual Line | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | / | |
| | . | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| Y | | |
| | A Skewed Image (needs rotating) | |
| +-----------------------------------------------+ |
| X |
+--------------------------------------------------------60.
s_P
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