fix(tooltip): get opacity from series visual

[linghaoSu]

Brief Information

This pull request is in the type of:

• bug fixing
• new feature
• others

fix bug introduced from #18921

What does this PR do?

before:

after:

Fixed issues

Details

Before: What was the problem?

get opacity from realtime visual color

After: How does it behave after the fixing?

Gets the series visual opacity like the legend, but the legend gets the opacity from legendLineStyle when drawType is stroke, so the legend markers are opaque in parallel series, and the default opacity of parallel series is 0.45, so the tooltip The marker's opacity is also 0.45.

https://github.com/apache/echarts/blob/master/src/component/legend/LegendView.ts#L610-L615

    if ((itemStyle.opacity as any) === 'inherit') {
        /**
         * Use lineStyle.opacity if drawType is stroke
         */
        itemStyle.opacity = (drawType === 'fill' ? itemVisualStyle : lineVisualStyle).opacity;
    }

1. line series
   If we set the opacity of lineStyle, the legend will respect these opacity.
   demo

2. parallel series
   But for the parallel series, we set the opacity of lineStyle. At this time, the legend ignores the opacity in lineStyle.
   demo

I'm not sure this is the appropriate way to fix this error, could you give me some suggestions?@Ovilia

Document Info

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Misc

ZRender Changes

• This PR depends on ZRender changes (ecomfe/zrender#xxx).

Related test cases or examples to use the new APIs

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[github-actions]

The changes brought by this PR can be previewed at: https://echarts.apache.org/examples/editor?version=PR-19552@77c707a

[Ovilia]

LGTM other than a small typo.

[Ovilia]

Duplicated ; here.

[Ovilia]

This may not be correct. With this change, the opacity in the tooltip of pie series cannot use series.data.itemStyle.opacity.

[linghaoSu]

After some testing, I found that the brush operation changes the colour of the graphic item, which will result in a colour change when tooltip is used, so would it also make sense for the brush operation to change the opacity of the tooltip?

[Ovilia]

I don't think so. The color should remain the same just as emphasis color should not be used when hovered.