I need to determine whether a selected UIColor (picked by the user) is dark or bright, so I can change the color of a line of text that sits on top of that color, for better readability.
I have a client and a server. On the client side I have: HttpWebRequest request = (HttpWebRequest)WebRequest.Create(\"http://localhost/fa/Default.aspx\");
目录1.简介2.例子3.添加数据4.定制图表5.获取配置6.导出图表7.总结1.简介 keplergl是由Uber开源的一款地理数据可视化工具，通过keplergl我们可以在Jupyter notebook中使用，
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