https://blog.csdn.net/jinmie0193/article/details/80816989
https://www.cnblogs.com/xiaoxiaing/p/6306678.html
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SweepGradient 扫描渐变
http://blog.csdn.net/t12x3456/article/details/10473225 -
LinearGradient 线性渐变
http://www.jianshu.com/p/a9d09cb7577f -
RadialGradient 环形渐变
http://blog.csdn.net/t12x3456/article/details/10419211
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