Question

这里的“ graphJSON”是用于绘制图形的变量，我如何使用此变量捕获（图像格式）图形？

graphJSON = json.dumps(data, cls=plotly.utils.PlotlyJSONEncoder)
plotly.io.to_image(graphJSON, format=None,
                   scale=None, width=None, height=None)

Answer 1

安装plotly-orca
创建情节人物
将图形转换为PNG
将二进制PNG转换为base64编码的字节
将base64字节解码为ascii，并将其传递到您的Jinja2模板

完整代码

import plotly
import base64
import jinja2

# create the graph
scatter = plotly.graph_objs.Scatter(x=[1, 2, 3], y=[2, 1, 3])
layout = plotly.graph_objs.Layout()
fig = plotly.graph_objs.Figure([scatter], layout)

# convert graph to JSON
fig_json = fig.to_json()

# convert graph to PNG and encode it
png = plotly.io.to_image(fig)
png_base64 = base64.b64encode(png).decode('ascii')

# definition of the Jinja2 template
template = """<html>
<head>
    <script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
</head>
<body>
    <img src="data:image/png;base64,{{ png_base64 }}" />

    <div id='divPlotly'></div>
    <script>
        var plotly_data = {{ plotly_data }}
        Plotly.react('divPlotly', plotly_data.data, plotly_data.layout);
    </script>
</body>

</html>"""

# generate the HTML page
with open('new_plot.html', 'w') as f:
    f.write(jinja2.Template(template).render(png_base64=png_base64, 
                                             plotly_data=fig_json))

如何以图像格式保存图

1 个答案: