helgasoft commented on issue #20369:
URL: https://github.com/apache/echarts/issues/20369#issuecomment-2835969702
There is no mystery on how to draw smooth lines - they just need more points.
Here is basic code to generate linear interpolation points.
```
function intermediatePoints(start, end, numPoints) {
const points = [];
for (let i = 1; i <= numPoints; i++) {
const t = i / (numPoints + 1);
const x = start.x + (end.x - start.x) * t;
const y = start.y + (end.y - start.y) * t;
points.push({ x, y });
}
return points;
}
const start = { x: 1, y: 1 }; // original data points
const end = { x: 5, y: 5 };
const numPoints = 3; // should depend on line's length for better result
const result = intermediatePoints(start, end, numPoints);
console.log(result);
// Expected output:
// [{x: 2, y: 2}, {x: 3, y: 3}, {x: 4, y: 4}]
```
Once ready, the points could be added one by one with _setOption_ to create
a smooth animation effect.
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