VisualMap draws abnormally when there are negative numbers

[Alexander-txj]

Version

5.2.1

Reproduction link

https://codepen.io/alexander-txj/pen/xxdaOGa

Steps to reproduce

The curve should be drawn in black, but when the negative number is set to the minimum value, the curve is red; when the minimum value is set to 0, the curve drawing is normal again

What is expected?

The curve should be black

What is actually happening?

The result curve is red

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Fix the error

[echarts-bot]

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[plainheart]

Another similar issue is #15877. Is it caused by our new implementation of the line gradient drawing introduced in #15711? @pissang

[echarts-bot]

This issue is labeled with priority: high, which means it's a frequently asked problem and we will fix it ASAP.