[Cuis-dev] VectorGraphics issue?

[Juan Vuletich]

Hi Hilaire,

In a recent bunch of updates I removed support for translucent 
backgrounds in the regular (whole pixel) Vector Engine for performance. 
But it is still available in the slower subpixel code. I've just added a 
new Canvas creation method to make this more convenient to use.

In your example, if you initially paint the form with any opaque color, 
it works as expected:

    | icon canvas iconExtent |
     iconExtent := 50 @ 50.
     icon := Form extent: iconExtent depth: 32.
     icon fillColor: Color white.
"    icon fillColor: Color orange."
     canvas := VectorCanvas onForm: icon.
     canvas fillColor: `Color white alpha: 0.5` do: [
         canvas moveTo: 0 at 0;
             lineTo: iconExtent x @0;
             lineTo: 0 @ iconExtent y;
             lineTo: 0 at 0].
icon

Using the new method, you get a correct translucent icon:

    | icon canvas iconExtent |
     iconExtent := 50 @ 50.
     icon := Form extent: iconExtent depth: 32.
     canvas := VectorCanvas onFormWithTranslucency: icon.
     canvas fillColor: `Color orange alpha: 0.5` do: [
         canvas moveTo: 0 at 0;
             lineTo: iconExtent x @0;
             lineTo: 0 @ iconExtent y;
             lineTo: 0 at 0].
     icon

I think this solves the issue.

Cheers,

On 2026-09-05 5:21 PM, Hilaire Fernandes via Cuis-dev wrote:
>
> I observe this issue since last update. The area is not painted as 
> expected and there is an unsolicited  black border.
>
>     | icon canvas iconExtent |
>     iconExtent := 50 @ 50.
>     icon := Form extent: iconExtent depth: 32.
>     canvas := VectorCanvas onForm: icon.
>     canvas fillColor: `Color white alpha: 0.5` do: [
>         canvas moveTo: 0 at 0;
>             lineTo: iconExtent x @0;
>             lineTo: 0 @ iconExtent y;
>             lineTo: 0 at 0].
> icon
>
> -- 
> http://mamot.fr/@drgeo
>
-- 
Juan Vuletich
www.cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
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