d3,颜色插值

最新推荐文章于 2025-06-26 09:01:50 发布

artemisrj

最新推荐文章于 2025-06-26 09:01:50 发布

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分类专栏： Javascript d3

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本文通过示例介绍D3.js中颜色插值的使用，详细解释了d3_interpolateHcl函数及其在过渡效果中的应用。

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下面的代码显示d3的几种颜色插值。

关于说明文档 https://github.com/mbostock/d3/wiki/Transitions#d3_interpolateHcl

示例

<body>
<div id="color" class="clear">
    <span>Linear Color Interpolation<br></span>
</div>
<div id="color-diverge" class="clear">
    <span>Hsl<br></span>
</div>
<div id="rgb" class="clear">
    <span>rgb<br></span>
</div>

<div id="lab" class="clear">
    <span>lab<br></span>
</div>

<script type="text/javascript">
    var max = 21, data = [];
    
		
	var color1="#7d57ba";
	var color2="#eb6502";
	
	var colorScale = d3.scale.linear() // <-A
        .domain([0,0.5,1])
        .range([color1,"#e6edff", color2]);
		
	var polate=d3.interpolateRgb(color1,color2);
	var rgb=d3.interpolateHsl(color1,color2);
	var lab=d3.interpolateLab(color1,color2);
    function divergingScale(pivot) { // <-B
        var divergingColorScale = d3.scale.linear()
            .domain([0, pivot, max]) // <-C
            .range(["#7d57ba", "#e6edff", "#eb6502"]);
        return divergingColorScale;
    }
    for (var i = 0; i < max; ++i) data.push(i);
    function render(data, scale, selector) { // <-D
        d3.select(selector).selectAll("div.cell")
                .data(data)
            .enter()
                .append("div")
                    .classed("cell", true)
                .append("span");
        d3.select(selector).selectAll("div.cell")
                .data(data)
            .exit().remove();
        d3.select(selector).selectAll("div.cell")
                .data(data)
            .style("display", "inline-block")
            .style("background-color", function(d){
                return scale(d/20); // <-E
            })
            .select("span")
                .text(function(d,i){return i;});
    }
    render(data, colorScale, "#color");
    render(data, polate, "#color-diverge");
	render(data,rgb,"#rgb");
	render(data,lab,"#lab");
	
	
	
</script>

<div class="control-group clear">
    <button onclick="render(data, divergingScale(5), '#color-diverge')">Pivot at 5</button>
    <button onclick="render(data, divergingScale(10), '#color-diverge')">Pivot at 10</button>
    <button onclick="render(data, divergingScale(15), '#color-diverge')">Pivot at 15</button>
    <button onclick="render(data, divergingScale(20), '#color-diverge')">Pivot at 20</button>
</div>

</body>

示例结果