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How can you make a graphic in Etoys transparent?

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Steve Thomas

How can you make a graphic in Etoys transparent?

How can you specify the alpha for a sketch? I was using the Fractionator as described in this post and it would be nice to be able to set the sketch's transparency. I can add an extra transparent playfield (which shows the gridlines even when alpha=0, which is nice) but the ability to set a sketch's alpha would be useful.

Stephen

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K K Subbu

Re: How can you make a graphic in Etoys transparent?

On Wednesday 03 Aug 2011 8:22:26 AM Steve Thomas wrote:
> it would be nice to be able to set the sketch's transparency. I can add an
> extra transparent playfield (which shows the gridlines even when alpha=0,
> which is nice) but the ability to set a sketch's alpha would be useful.
AFAIK, SketchMorph is a special kind of Morph that can rotate an arbitrary
Form efficiently before displaying it. It is not capable of varying the alpha
(translucency) of this form.

You could add a feature request or discuss it in squeak-dev mailing list.

Subbu
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K K Subbu

Re: How can you make a graphic in Etoys transparent?

On Wednesday 03 Aug 2011 9:39:03 PM K. K. Subramaniam wrote:

> On Wednesday 03 Aug 2011 8:22:26 AM Steve Thomas wrote:
> > it would be nice to be able to set the sketch's transparency. I can add
> > an extra transparent playfield (which shows the gridlines even when
> > alpha=0, which is nice) but the ability to set a sketch's alpha would be
> > useful.
>
> AFAIK, SketchMorph is a special kind of Morph that can rotate an arbitrary
> Form efficiently before displaying it. It is not capable of varying the
> alpha (translucency) of this form.
>
> You could add a feature request or discuss it in squeak-dev mailing list.

Oops! I just saw your feature request.

Meanwhile, you could use a trick to simulate fade-in/fade-out for locked down
sketches. Place the sketch in between two rectangle siblings. Vary the alpha
of the top rectangle to affect the translucency of the sketch.

HTH .. Subbu
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Karl Ramberg

Re: How can you make a graphic in Etoys transparent?

Translucency is not very well integrated into Etoys/Squeak.

You can import images with translucency but it's hard to make translucent images in Etoys.

This is another area that needs more work :-)

Karl

On Wed, Aug 3, 2011 at 6:16 PM, K. K. Subramaniam <kksubbu.ml@gmail.com> wrote:

On Wednesday 03 Aug 2011 9:39:03 PM K. K. Subramaniam wrote:
> On Wednesday 03 Aug 2011 8:22:26 AM Steve Thomas wrote:
> > it would be nice to be able to set the sketch's transparency. I can add
> > an extra transparent playfield (which shows the gridlines even when
> > alpha=0, which is nice) but the ability to set a sketch's alpha would be
> > useful.
>
> AFAIK, SketchMorph is a special kind of Morph that can rotate an arbitrary
> Form efficiently before displaying it. It is not capable of varying the
> alpha (translucency) of this form.
>
> You could add a feature request or discuss it in squeak-dev mailing list.

Oops! I just saw your feature request.

Meanwhile, you could use a trick to simulate fade-in/fade-out for locked down
sketches. Place the sketch in between two rectangle siblings. Vary the alpha
of the top rectangle to affect the translucency of the sketch.

HTH .. Subbu

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