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Constant
增加 constant 比例尺。
解决问题
当某一个通道的值为固定值的时候,比如:
这个通道对应的比例尺可以是 constant,也可以是 identity。区别在于 constant 比例尺的 range 会把这个值存下来,但是 identity 不会,这样就会出现下图中的问题:没有办法给图例加颜色。所以把非位置通道的常量通道设置成 constant 比例尺。
这个 PR 为解决 #4603 提到的一个问题提供了基础。@Aarebecca