Hello,
In the Rome examples, we create a Canvas on a 'Form' (and it's on this Form
that the drawing will be visible).
In all RomeExample, the form on which we display is 'Display' (the class
representing the display screen), but we can choose any other kind of Form.
So basically , if you want to use a RomeCairoCanvas, you do:
|canvas|
canvas := RomeCairoCanvas on: Display (or any other kind of Form).
canvas drawRectangle: ...
....
canvas finish (=> to make the changes visible)
Then if you choose to display on a basic Form, I guess you can integrate
this Form to a Morph (?).
2010/6/15 Alexandre Bergel <alexandre.bergel(a)inria.fr>
but the
example proposed by jean-remi is exactly the same as the one
proposed by jannik a
while ago
this is a complex case.
Yes, I will work on it. I have to identify where the slowness comes from,
from Mondrian or package blueprint.
Alexandre
Stef
On Jun 15, 2010, at 2:46 PM, Alexandre Bergel wrote:
>> I did not say that he did not say anything. I just said that it is
difficult to find where problems are by looking at a very complex case. When
the problems were raised, we did look into the issues, but it was just too
difficult especially when we had multiple problems in the same time.
>>
>> Now we are in the situation in which multiple people noticed multiple
problems, there are some fixes, but there are still problems left. So, we
have to dig deeper and we should do it more systematically by creating
simpler cases that reproduce the problem. It's not an issue of "I told you
so", it's an issue of "We need help to identify all problems" :).
>
> +1
>
> Alexandre
>
>>
>>
>> On 15 Jun 2010, at 14:01, Stéphane Ducasse wrote:
>>
>>> Doru
>>>
>>> Jannik said it several times - check the list. So do not tell him that
he did not want to help.
>>>
>>> Stef
>>>
>>> On Jun 15, 2010, at 1:25 PM, Tudor Girba wrote:
>>>
>>>> One more thing.
>>>>
>>>> It can also be that when you have expensive traversals in your
blocks, you can easily get to quadratic algorithms.
>>>>
>>>> For example, suppose you have something like this:
>>>>
>>>> view shape
>>>> height: [:each | (classes select: [:target | target invokes: each])
size].
>>>> view nodes: classes
>>>>
>>>> In this case, for each class, you would traverse all classes again,
so N^2.
>>>>
>>>> That is why we need canonical examples first that expose complex
graphs. And those people that have a direct interest in getting Mondrian
fast would be good to help in this direction, because it can get difficult
to understand the particularities of each model :)
>>>>
>>>> Cheers,
>>>> Doru
>>>>
>>>>
>>>> On 15 Jun 2010, at 13:13, Tudor Girba wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>>> now something important is that mondrian is barely usable for us:
DSM, package blueprint, torch are all slow.
>>>>>> I would really like to
see some pragmatic solutions to be found.
Like not computing all the blocks all
over the time.
>>>>>
>>>>> This is what we are already discussing, but until now it is not
clear what exactly generates the slowness. I believe the problem comes from
the edges, but we have to take a more systematic look.
>>>>>
>>>>> The other thing that has an impact is that right now Mondrian
computes everything lazily, so even if the visualization appears, scrolling
might still be problematic the first time you go through the entire picture.
So, testing should also take this into account.
>>>>>
>>>>> Doru
>>>>>
>>>>>> Stef
>>>>>>
>>>>>> On Jun 15, 2010, at 12:43 PM, Tudor Girba wrote:
>>>>>>
>>>>>>> Hi Cyrille,
>>>>>>>
>>>>>>> The canvas is defined in MOCanvas. This canvas is embedded in
MOBrowser and MOEasel, which in their turn create a StandardWindow that
holds the MOCanvas.
>>>>>>>
>>>>>>> Just to inform the others, Cyrille is experimenting with
adding
the Athens canvas (which provides an abstraction over Cairo, Balloon and
possibly others) behind Mondrian.
>>>>>>>
>>>>>>> Cheers,
>>>>>>> Doru
>>>>>>>
>>>>>>>
>>>>>>> On 15 Jun 2010, at 11:42, Cyrille Delaunay wrote:
>>>>>>>
>>>>>>>> Hello,
>>>>>>>>
>>>>>>>> I have been looking a bit for the place where we set the
canvas
to use in Mondrian, but I didn't find.
>>>>>>>> I know that all
shapes are drawn on a FormCanvas, but there is no
references to FormCanvas in
mondrian classes.
>>>>>>>> I just saw that
there is a 'defaultCanvasClass' method in the
class Form for example, so
maybe such a method is use somewhere in the code.
>>>>>>>> Does somoene know
the way to set a new Canvas to Mondrian ?
>>>>>>>>
>>>>>>>> _______________________________________________
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>>>>>>>> Moose-dev(a)iam.unibe.ch
>>>>>>>>
https://www.iam.unibe.ch/mailman/listinfo/moose-dev
>>>>>>>
>>>>>>> --
>>>>>>>
www.tudorgirba.com
>>>>>>>
>>>>>>> "Presenting is storytelling."
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>>
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>>>>>>
>>>>>>
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>>>>>
>>>>> --
>>>>>
www.tudorgirba.com
>>>>>
>>>>> "There are no old things, there are only old ways of looking at
them."
>>>
>>>
>>>
>>
>> --
>>
www.tudorgirba.com
>>
>> "In a world where everything is moving ever faster,
>> one might have better chances to win by moving slower."
>>
>>
>>
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>
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--
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"Sometimes the best solution is not the best solution."
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