[Cuis-dev] Fix for VectorCanvas>>#image:at:

[Juan Vuletich]

Hi Luciano,

On 5/30/2023 9:06 AM, Luciano Notarfrancesco via Cuis-dev wrote:
> BTW, in case anyone is curious, here is how matrices look when 
> printing them on a workspace with cmd-p. I draw matrices over the 
> binary field in a special way (first screenshot), and I scale them 
> down if they are too big.
> I did this because it was hard to make matrices look good when 
> printing them as text, so instead I draw them on a form and embed the 
> form when printing them. I only do this with matrices, they are 
> especially problematic when printing because they print with more than 
> one line, they are the only objects in my system that need more than 
> one line for printing. When I printed them as text with more than one 
> line, printing a list of matrices (for example an array of matrices, 
> as in the example where I print a basis of a vector space in the 
> screenshots) they would look horrible. Now a list of matrices is 
> printed in a single line as expected, and the point size of the 
> enclosing parentheses is adjusted automatically (I have messages 
> Stream>>#withParentheses:, #withBrackets:, #withAngleBrackets:, etc, 
> that do this automatically).

It looks beautiful!

> I still have two little problems that I might want to tweak:
> 1) the parentheses are too thick, setting the point size is not the 
> right thing to do, maybe we need a new text attribute for scaling text 
> without changing the point size?;

The easiest solution is to use a different font, just for the 
parentheses. For example, NeoEuler parentheses are much lighter at large 
point sizes.

> 2) matrices inside matrices loose the transparent background, the 
> background becomes black, as you see in the example in the second 
> screenshot.

I guess this should be fixable. If you can prepare an image with such 
example for me to play with, I'll give it a try. For example (not sure 
if related) VectorEngine can do blending over translucent backgrounds, 
but only if subpixel sampling is used. I know, there is no relation 
between these two features... But I wanted to keep options to a small 
number, and usually we only use cheaper whole pixel AA and cheaper alpha 
blending that can't blend over translucent backgrounds. So, maybe just 
using the SubPixel engine solves this problem, or I'll be happy to take 
a look.

>
> On Tue, May 30, 2023 at 7:27 PM Luciano Notarfrancesco 
> <luchiano at gmail.com <mailto:luchiano at gmail.com>> wrote:
>
>     This change set fixes a little bug in VectorCanvas that cames up
>     when using the canvas to draw text with images on a form (outside
>     morphic). I do this to draw matrices, and when drawing a matrix
>     whose coefficients are also matrices this came up. The fix is
>     simply checking that the world is not nil.
>

Integrated and at GitHub. Thanks!

Cheers,

-- 
Juan Vuletich
cuis.st
github.com/jvuletich
researchgate.net/profile/Juan-Vuletich
independent.academia.edu/JuanVuletich
patents.justia.com/inventor/juan-manuel-vuletich
linkedin.com/in/juan-vuletich-75611b3
twitter.com/JuanVuletich

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