helgasoft commented on issue #19944:
URL: https://github.com/apache/echarts/issues/19944#issuecomment-2118029838
when visualMap dimension/pieces are by X-axis, vertical or near-vertical
lines will have two colors (start, end). These two colors blend depending on
_pieces_ rules. Your upper chart example shows the blending effect more
pronounced because many lines overlap. This is not a bug, since the API
documentation does not elaborate on **how** blending is done and what
**results** should be expected.
A suggestion for alternative coloring by Y-axis:
```
dimension: 1, pieces: [{ gte: 0, lt: 110 }, { gte: 110 }],
inRange: { color: ['red', 'green'] },
```
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