spirit-boy-guan opened a new issue, #18640:
URL: https://github.com/apache/echarts/issues/18640
### What problem does this feature solve?
```
visualMap: [
{
pieces: [
{gt: 100, lte: 200, color: 'red'},
{gt: 150, lte: 300, color: 'blue'}
],
}
]
```
对于折线图，当pieces 区域重叠时，echarts会自动合并pieces, 当pieces颜色不同时，合并规则是：
1、完全覆盖，展示区域大的peice
2、覆盖：优先展示前面的piece
### What does the proposed API look like?
pieces: [
{gt: 100, lte: 300, color: 'red', level: 2},
{gt: 150, lte: 200, color: 'blue', level: 1}
],
优先展示优先级高(这里为1)的piece
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