2 Feb
2009
2 Feb
'09
10:22 p.m.
Yes, we basically draw on canvas. Actually in
Mondrian, unlike in
Chronia, we have an object for each figure, but the object is only
doing Mondrian specific things and has no bloat with it.
What alex showed me was not that snappy so I was wondering because
drawing in the canvas can be really fast.
Initially we started Mondrian with HotDraw, but even
that was too
slow, so we (well, mostly Michael :)) ended up implementing
dedicated objects.
I can imagine HotDraw is dog slow.
Thanks doru
Cheers,
Doru
On Feb 2, 2009, at 9:22 PM, Stéphane Ducasse wrote:
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Hi,
As Lukas says, Morphs do not scale when you have thousands of them.
I really
wonder why (expect that morphic is doing far too much too)
I imgaine that this is the same as with VW
and when adrian implemented the visualiziation for chronia.
so do you draw on a canvas and map back the coordinates to the
object that should represent it?
Stef
Drag and drop did work at some point. It's
just that Jorge and me
started a larger refactoring that was supposed to improve the
model but stopped at midway because of some low level problems.
I will synchronize tomorrow with Alex and we will see what we can
do.
Cheers,
Doru
On Feb 2, 2009, at 8:37 PM, Lukas Renggli wrote:
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Moose-dev(a)iam.unibe.ch
https://www.iam.unibe.ch/mailman/listinfo/moose-dev > I was wondering why you did not use morphs
for mondrian since I
> have the
> impression that for drag and drop
> alex is reinventing the morph event dispatch loop.
I don't know exactly the current situation, but when I last
worked on
Mondrian for Squeak it had drag and drop. These were a couple of
lines
of code built on top of the basic mouse events. Essentially this is
the same as when you implement drag and drop in the HTML DOM tree.
Morphic is way too slow, way to wasteful with memory and too
platform
dependent for something like Mondrian. One of the reasons why the
original Mondrian is not portable, is because it is tightly
connected
with the graphic system of VisualWorks.
Lukas
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http://www.lukas-renggli.ch
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