[etoys-dev] Customizable project resolution?

[Xin Wang]

On Wed, Dec 29, 2010 at 9:58 PM, Bert Freudenberg <bert at freudenbergs.de> wrote:
>
> On 29.12.2010, at 02:44, Xin Wang wrote:
>
>> On Tue, Dec 28, 2010 at 11:27 PM, Bert Freudenberg <bert at freudenbergs.de> wrote:
>>>
>>> On 28.12.2010, at 15:32, Xin Wang wrote:
>>>
>>>> On Tue, Dec 28, 2010 at 8:31 PM, Bert Freudenberg <bert at freudenbergs.de> wrote:
>>>>>
>>>>> On 28.12.2010, at 13:24, Xin Wang wrote:
>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> In order to share projects easily, project resolution is set to
>>>>>> 1200x900, and use VirtualScreen to scale to fit the physical screen.
>>>>>>
>>>>>> But for some small screens, 1200x900 is a bit large, so the project
>>>>>> world has to be zoomed out a lot.  In some languages, such as Chinese,
>>>>>> there are a number of font glyphs are complex, as those characters
>>>>>> also has to be zoomed out, they may not be showed very clearly.
>>>>>>
>>>>>> So is it better to make project resolution customizable? Just like we
>>>>>> can set canvas size to any value in image manipulation programs. As
>>>>>> projects are displayed using VirtualScreen, this change will not
>>>>>> affect project sharing.
>>>>>>
>>>>>> The bounds of project world is initialized in
>>>>>> worldPasteUpMorph>>initForProject, when I change it to some other
>>>>>> value instead of Display boundingBox, project displays properly, so I
>>>>>> think it may be not very difficult to implement this.
>>>>>>
>>>>>> So could this feature be added into Etoys?
>>>>>
>>>>> You could add it to the "display mode" menu (defined in #chooseScreenSetting).
>>>>
>>>> Well, I'll try to do it.
>>>>
>>>>>
>>>>> Though a better solution might be to use larger fonts? On the OLPC XO we do not use screen scaling but its native 1200x900 resolution. Scaling is too slow on that laptop.
>>>>>
>>>>
>>>> As font is rendered before scaling, characters seem a bit ugly after
>>>> world is zoomed out.
>>>>
>>>> And recently I tried to use RomePlugin in Windows, text looks alien if
>>>> project is scaled, although Pango use Windows native font rendering
>>>> API.
>>>>
>>>> How about choose Display Actual Pixels instead of Scale To Fit in OLPC
>>>> XO?
>>>
>>> On XO we use "no scaling". Can't remember what happens when loading a project of different size.
>>>
>>>> It does not scale the world, but just put the world in the center
>>>> of screen. Does it also has a performance loss?
>>>
>>> It does a double-copy, so yes, it has performance loss.
>>>
>>> - Bert -
>>>
>>
>> Does "double-copy" means that Etoys firstly draw on an internal buffer
>> and then copy it to virtual screen?
>
> Yes. See class OLPCVirtualScreen.
>
>> As there is no scaling operation in "display actual pixels" mode,
>> could this behavior be changed so that we can draw on virtual screen
>> directly?
>
> That should be possible, yes. Incidentally a similar question came up on another list yesterday:
>
> http://lists.squeakfoundation.org/pipermail/beginners/2010-December/007457.html
>
> - Bert -
>

Thanks, I will have a try.

>
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