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. Initially we started Mondrian with HotDraw, but even that was too slow, so we (well, mostly Michael :)) ended up implementing dedicated objects.
Cheers, Doru
On Feb 2, 2009, at 9:22 PM, Stéphane Ducasse wrote:
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:
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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