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创建一个均匀的量化的线性比例尺 d3.d3.scaleQuantize #3

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ckinmind opened this issue Jul 15, 2017 · 0 comments

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ckinmind commented Jul 15, 2017 •

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var quantizeScale = d3.scaleQuantize()
    .domain([0, 100])    // 数据范围, 会平均分成三部分对应range的三个值
    .range(['red', 'white', 'green']) // 映射范围

console.log(quantizeScale(22))     // red
console.log(quantizeScale(50))    // white
console.log(quantizeScale(88))   // green

console.log(quantizeScale.invertExtent('white'))
// [33.333333336, 66.666667] , 从颜色倒推回数值范围

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