treisebast opened a new issue, #20572:
URL: https://github.com/apache/echarts/issues/20572
### Version
5.5.1
### Link to Minimal Reproduction
-
### Steps to Reproduce
option = {
xAxis: {
type: 'category',
boundaryGap: false
},
yAxis: {
type: 'value',
boundaryGap: [0, '30%']
},
dataZoom: [
{
type: 'inside'
},
{
type: 'slider',
showDataShadow: false,
handleIcon:
'path://M10.7,11.9v-1.3H9.3v1.3c-4.9,0.3-8.8,4.4-8.8,9.4c0,5,3.9,9.1,8.8,9.4v1.3h1.3v-1.3c4.9-0.3,8.8-4.4,8.8-9.4C19.5,16.3,15.6,12.2,10.7,11.9z
M13.3,24.4H6.7V23h6.6V24.4z M13.3,19.6H6.7v-1.4h6.6V19.6z',
handleSize: '80%'
},
{
type: 'inside',
orient: 'vertical'
},
{
type: 'slider',
orient: 'vertical',
showDataShadow: false,
handleIcon:
'path://M10.7,11.9v-1.3H9.3v1.3c-4.9,0.3-8.8,4.4-8.8,9.4c0,5,3.9,9.1,8.8,9.4v1.3h1.3v-1.3c4.9-0.3,8.8-4.4,8.8-9.4C19.5,16.3,15.6,12.2,10.7,11.9z
M13.3,24.4H6.7V23h6.6V24.4z M13.3,19.6H6.7v-1.4h6.6V19.6z',
handleSize: '80%'
}
],
visualMap: {
type: 'piecewise',
show: false,
dimension: 0,
seriesIndex: 0,
pieces: [
{
gt: 1,
lt: 3,
color: 'rgba(0, 0, 180, 0.4)'
},
{
gt: 5,
lt: 7,
color: 'rgba(0, 0, 180, 0.4)'
}
]
},
series: [
{
type: 'line',
smooth: 0.6,
symbol: 'none',
lineStyle: {
color: '#5470C6',
width: 5
},
markLine: {
symbol: ['none', 'none'],
label: { show: false },
data: [{ xAxis: 1 }, { xAxis: 3 }, { xAxis: 5 }, { xAxis: 7 }]
},
areaStyle: {},
data: [
['2019-10-10', 200],
['2019-10-11', 560],
['2019-10-12', 750],
['2019-10-13', 580],
['2019-10-14', 250],
['2019-10-15', 300],
['2019-10-16', 450],
['2019-10-17', 300],
['2019-10-18', 100]
]
}
]
};
### Current Behavior
This is what the chat looks like after initialization:

When zooming into the chart, the curve of the chart changes in a way that it
no longer displays the desired shape or behavior:

### Expected Behavior
The actual curve of the graph should remain approximately the same:

When zooming into the chart and some points end up outside the visible area,
the remaining points are automatically reconnected, creating new connections.
This, however, alters the curve of the graph. My expectation is that the
graph's line should exit the chart at the x-axis (zero line) and re-enter later
without changing the original curve.
### Environment
```markdown
- OS:
- Browser:
- Framework:
```
### Any additional comments?
_No response_
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