pyecharts桑基图link颜色设置

你可以使用 `visualmap` 来设置桑基图的颜色。

下面是一个示例代码：

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

nodes = [
    {"name": "category1"},
    {"name": "category2"},
    {"name": "category3"},
    {"name": "category4"},
    {"name": "category5"},
    {"name": "category6"}
]

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},
    {"source": "category5", "target": "category6", "value": 30}
]

sankey = Sankey()
sankey.add(
    series_name="",
    nodes=nodes,
    links=links,
    linestyle_opt=opts.LineStyleOpts(opacity=0.2),
    label_opts=opts.LabelOpts(position="right"),
    # 设置颜色
    visualmap_opts=opts.VisualMapOpts(
        orient="horizontal",
        pos_left="10",
        pos_top="10",
        min_=10,
        max_=30,
        range_text=["High", "Low"],
        dimension=0,
        # 设置颜色范围
        range_color=["lightskyblue", "yellow", "orangered"]
    )
)
sankey.render("sankey.html")

运行以上代码，你可以得到一个带有渐变颜色的桑基图。你可以根据需要调整 `range_color` 参数来设置颜色范围。