pyecharts桑基图布局调整

Pyecharts 的桑基图默认布局是水平布局，如果需要调整布局，可以使用 `orient` 参数来设置为垂直布局。

例如，以下代码是一个水平布局的桑基图：

from pyecharts import options as opts
from pyecharts.charts import Sankey

nodes = [
    {"name": "category1"},
    {"name": "category2"},
    {"name": "category3"},
    {"name": "category4"},
    {"name": "category5"},
]

links = [
    {"source": "category1", "target": "category2", "value": 10},
    {"source": "category2", "target": "category3", "value": 15},
    {"source": "category3", "target": "category4", "value": 20},
    {"source": "category4", "target": "category5", "value": 25},
]

sankey = (
    Sankey()
    .add(
        "sankey",
        nodes,
        links,
        linestyle_opt=opts.LineStyleOpts(opacity=0.2, curve=0.5, color="source"),
        label_opts=opts.LabelOpts(position="right"),
    )
    .set_global_opts(title_opts=opts.TitleOpts(title="Sankey-Horizontal"))
)

sankey.render("sankey_horizontal.html")

如果要将其改为垂直布局，只需在 `Sankey` 类的参数中加入 `orient="vertical"`，如下：

sankey = (
    Sankey()
    .add(
        "sankey",
        nodes,
        links,
        linestyle_opt=opts.LineStyleOpts(opacity=0.2, curve=0.5, color="source"),
        label_opts=opts.LabelOpts(position="right"),
        orient="vertical",  # 垂直布局
    )
    .set_global_opts(title_opts=opts.TitleOpts(title="Sankey-Vertical"))
)

然后再次运行代码即可得到垂直布局的桑基图。