pyecharts设置背景图片

可以使用渐变色作为背景，代码如下：

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

line = Line()
line.add_xaxis(['Jan', 'Feb', 'Mar', 'Apr', 'May'])
line.add_yaxis('Sales', [120, 200, 150, 80, 70])

line.set_global_opts(
    title_opts={"text": "Sales Trend"},
    graphic_opts=[
        opts.GraphicImage(
            graphic_item=opts.GraphicItem(
                id_="logo",
                right=20,
                top=20,
                z=10,
                bounding="raw",
                origin=[75, 75],
            ),
            graphic_imagestyle_opts=opts.GraphicImageStyleOpts(
                image="https://s3.ax1x.com/2020/11/05/BW8Vvq.jpg",  # 背景图片链接
                width=150,
                height=150,
                opacity=0.8,
            ),
        ),
        opts.GraphicRect(
            graphic_item=opts.GraphicItem(
                left="center", top="center", z=100
            ),
            graphic_shape_opts=opts.GraphicShapeOpts(
                width=800, height=350
            ),
            graphic_basicstyle_opts=opts.GraphicBasicStyleOpts(
                fill="rgba(0,0,0,0.3)"
            ),
        ),
    ],
)
line.render('line.html')

其中，`graphic_imagestyle_opts` 中 `image` 参数可以设置背景图片的链接。另外，还可以通过 `graphic_basicstyle_opts` 设定渐变色的透明度、颜色等参数。