mkf62 commented on issue #18437:
URL: https://github.com/apache/echarts/issues/18437#issuecomment-3193817779
ECharts stacks on whatever value is first encountered in a data coordinate
as long as it's suitable for stacking. We usually structure data coordinates
like `[x, y]`. Since you want to stack your Y values, you just have to reverse
your value coordinates so y-values are first in the order, e.g. `[y, x]`. Then
you can `encode` the series, telling it that the x-value is at index 1 and the
y value is at index 0, e.g. `encode: {x: 1, y: 0}`. Use `stack` to group all
the series you want to stack, and add `stackStrategy: "all"` to the series at
index 1 or above.
The only real problem with this is that now you have to create custom
tooltips that reflect the y-values, not the x-values because tooltips
apparently don't follow whatever you set in `encode`. It can be done (I have
done it before myself), but it's annoying.
[Demo](https://echarts.apache.org/examples/en/editor.html?c=area-stack&code=MYewdgzgLgBAHjAvDA2gBgHRoIwBoaYCsa-2WeMZx-ATObRoRQMz0yvUwAsbPnhWEjAFN8ANjYTOAdjazRMAByD8yzgE42mztkw5SRCtjJohxxkbr7KdBdlbX7jMz1OkeNFxi5GeYr4pmAo4CnqQCPuEY_lGBpBKOEjRGElxmEjGUEnGUsm65GGEFkQViRrKKRsqOykXYyiX10WbKlaSa-diaye3eZpqZXRiVALoA3ABQADYAprAAnthIqCZmWMykWISbaIqbuvsblBjY28fY0pt1hTRXZ2Q0l8fMa8y3z1ybzE9kzOqbjW8n2OXDEAL2xx0jHeVGBVB-jH-xzKmzEMOicOi92iYORCLE-IhZDESLI0jW5M20iMGGk6LpVKOZMx0hZ2OkuLJnNpCOkRNp_OkpOGaxyZDaxwl4vRihlTOGXHG0zmMHmNGW6DYmGpOyE2qEAFo9BQjbT3gbVvhTTqCFraTT8vqrXpzdqTZaYNa9XabR6nZ7jc77VaPV78C7w2bdZGbab8qbmCbMJlTRLTeozhaVAGMBmgzlTYQIQmKIHbW9I4QkZgJZg88dHbmzjXvUXIy8g9YS0Gq_mk02Q9n05ma_3ezmXkqJotlnAMABbACGAAcABSruAANUXU3wAEsAJRIAB8qEWKD3I3wW53IwPkzVs4XK_XN93MEPJ7PNAvV_g26mO9JgmEBlygPdwGWABvCYYBgcCoFmAAuGAYLguCoBmOAoBQgByABlKBF2AABrGYABMYAAQQAJxmRcYAAYQAC0XGioFw2CYAAX1wLioBAEApnA5cULQ9CoBovcAHNpJmGi8MXOA9wgXC-PQmAlJUgAFEA9zATCFNQriNKgeZlxmPDgBokAIFU9SNJgKZFwAIxmKYxJMxyXOIkjpJsgBXMByMYoSQCM3CAGIx
EXIVFEITjHJ4rzeK41K4LgKjlIgFCUC88TTPMyyYFwgA3HcApmNSvLg_TDPKjzKAcjSXJAILyLY-YAHEVxQgAzHcIBmZr0I6oiULgEa4KXOA8LGxcAFklMS9DuK4q8uPmLKVNy_Kavgoq8IayqVrgta4I2uChqkmYctQPakrARd52K3CAE1sGqpKzIsvCpn0qqppgaBfLwgAVEAiKmL7HLY-jCPmZDUPSxyZnnZdWIgHbjKSuC-pAYAAru3Drr3W7TtWoH5pQxYgZmMBQHI4qoNmprVRQtBzsph7HKel68LemgYcK36Sv-sBAf2kHSPByGd2F9DpZIwiaMXTDpPmRSpmhoG4cXBGkaglGNLRjHFyxu6Csc_HCeJ0nyf243RrVxcadufb6cZ5nWYoTWCC5s6-JGbigA)
<img width="727" height="546" alt="Image"
src="https://github.com/user-attachments/assets/43851961-70e7-4224-af2e-8d7a275295bf";
/>
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