leoclo commented on issue #18344:
URL: https://github.com/apache/echarts/issues/18344#issuecomment-2234984012
Thats because its connecting dots on the other side of the world.
This should adjust getPolygon to check it.
function getPolygon(api, coords, bounds){
let points = [];
let is_visible = false;
let point_pixel_ref = api.coord([0, 0])[0];
for (let i = 0; i < coords.length; i++) {
let point_pixel = api.coord(coords[i]);
if(point_pixel[0] < point_pixel_ref && coords[i][0] > 0){
continue;
}
if(point_pixel[0] > point_pixel_ref && coords[i][0] < 0){
continue;
}
if(bounds){
if(bounds.contains({lng: coords[i][0],lat: coords[i][1]})){
is_visible = true;
}
}
points.push(point_pixel);
}
if(!is_visible){
return {
type: 'polygon',
shape: {
points: []
},
};
}
//
https://ecomfe.github.io/zrender-doc/public/api.html#zrenderdisplayable
let style = api.style();
return {
type: 'polygon',
shape: {
points: points
},
style: style,
styleEmphasis: {
shadowBlur: 4, fontWeight: 'bold',
}
}
}
So the if with point pixel ref is checking it.
Its basically checking if would be connecting negative longitude with
positive longitude.
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