From: rpragana@acm.org
Subject: Announce: SlideWidget alpha.
Date: Tue, 06 Oct 1998 22:57:02 GMT

Hi!

I'm implementing a simple widget for doing fast drawings, as the canvas is
not very suitable for what I plan to do. The "slide" widget is not a
general replacement for the canvas, but very simple to use, fast and have
some features suitable for editing slides:

* a background with "glued" objects that make it fast to be redrawn, even
with many such objects (inspired by the raster widget). You may glue/unglue
items at will.

* images got directly from the file, without tk's caching, resized
on-the-flight, with very fast dithering.  Read only jpeg now, but can easily
be adapted for other image formats.

* zoom as a configuration option (config -zoom n*16) giving reduced (n<1)
or enlarged (n>1) view. Of course, the widget is scrollable too, using
standard scrollbars.

* rubberbands configurable (rectangular, line, oval), using XOR function,
directly on top of the pixmap, to not disturb the drawing, and for fast
redraw.

* layered structure. You can make "config -visible 0" to not show all
objects in a layer. Any number of layers can be created with no speed
impact.

* The object kinds we have now are only lines,rectangles,arcs/ovals and
images. But I plan to include at least splines.

* exporting to jpeg images. (other formats, including postscript will be
available soon)

* There will be (not yet done) a command to map the "slide widget" image to
the root, to show a slide presentation, with effects to change from one
slide to the other.  This is the main purpose of the widget.


I'm looking for other interested people (hackers) to help me in
design/develop this code.  All coding done in plain C, adapted from the
square widget.  If you want what I've done yet, please ccontact me at
rpragana@acm.org. (Sorry, but no release in a home page yet, only by e-mail,
but the code is GPLed)


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