Smooth color transition creates a wrong offset

[bokub]

Hello,

When using the color_thresholds feature with a hard transition, the colors are placed exactly like I expect them to be:

However, if I use the smooth transition instead (default mode), the red part completely disappears and the blue part becomes a lot bigger:

However, the dots have the right color when I hover the graph:

N.B: I'm using the version 0.11.0 of the card.

Here are the rendered linear gradients:

<!-- Hard mode -->
<linearGradient gradientTransform="rotate(90)" id="grad-vhiq9t48e-0">
            <stop stop-color="#0000ff" offset="44.77958236658934%"></stop>
            <stop stop-color="#00ff00" offset="44.78932714617168%"></stop>
            <stop stop-color="#00ff00" offset="81.32250580046383%"></stop>
            <stop stop-color="#ff0000" offset="81.33225058004618%"></stop>
            <stop stop-color="#ff0000" offset="117.86542923433832%"></stop>
            <stop stop-color="#ff0000" offset="117.87517401392067%"></stop>
</linearGradient>

<!-- Smooth mode -->
<linearGradient gradientTransform="rotate(90)" id="grad-qdc5p29le-0">
            <stop stop-color="#0000ff" offset="44.77958236658934%"></stop>
            <stop stop-color="#00ff00" offset="81.32250580046383%"></stop>
            <stop stop-color="#827c00" offset="117.86542923433832%"></stop>
</linearGradient>

I tried to manually edit the gradient offsets, and this gradient looks way better:

<linearGradient gradientTransform="rotate(90)">
            <stop stop-color="#0000ff" offset="0"></stop>
            <stop stop-color="#00ff00" offset="44.77958236658934%"></stop>
            <stop stop-color="#827c00" offset="81.32250580046383%"></stop>
</linearGradient>

[ildar170975]

Confirm the issue: we can see circles of one color on the line of another color - but they should be of the same color:

[bokub]

@jlsjonas you added the enhancement label, but don't you think it's a bug ?

[jlsjonas]

@bokub From your description it feels like the side effect of smoothing out the background areas. The dots to (still) have the correct color, so the base calculation should be fine; which is why I opted for the enhancement label (enhancing what is already there), but it could be considered as either.

[bokub]

Hmmm, I was thinking there's an error in the computed "offsets" in smooth mode, but I might be wrong.

The color of the dots and the colors in "hard" mode are just my "proofs" that the displayed color is not the one we expect to see.

[stale[bot]]

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