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D3.js Heatmap & 画像 & 凡例 (初心者向け-メモレベル)

Last updated at Posted at 2017-09-08

------作成中、完成版ではない-------
もし著作権違反があれば、教えてください!!

■成果物イメージ 

2017-09-08 10_55_45-ヒートマップ.png

test.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ヒートマップ</title>
</head>

<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-legend/2.13.0/d3-legend.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3-legend/1.13.0/d3-legend.min.js"></script>

<style>
#div1 {
  z-index:20;
}
svg {
  width:160px;
  height:240px;
}
/* 画像とheatmapを重なるため*/
#canvases {
  position:relative;  
}

/* 画像とheatmapを重なるため*/
.canvas {
  position:absolute;
}


</style>

<body>
<h1>ヒートマップ</h1>


<div id="canvases" style="width:350px;height:280px;">
<img class="canvas" src="/images/o0480048012773923150.jpg" alt="test" style="width:160px;height:240px;">     //画像の描画
<svg class="canvas" id="mygraph"></svg> //heatmapの描画
</div>

//凡例
<svg  id="svg-color-quant" ></svg> 
<script src="/js/d3.js"></script>

</body>
</html>

##下記のjsは引用となります

var svgWidth=160;
var svgHeight=240;
var blocksize=20; //ブロックのサイズ
//データセット
var dataset = [
1,2,3,4,5,6,5,3,4,
1,2,2,4,9,1,5,1,5,
2,2,8,0,4,5,5,2,6,
9,2,3,4,5,7,5,3,7,
3,2,6,4,0,6,2,4,8,
1,7,8,2,4,6,3,5,2,
9,2,3,4,5,7,5,3,7,
3,2,6,4,0,6,2,4,8,
3,2,6,4,0,6,2,4,8,
1,2,2,4,9,1,5,1,5,
9,2,3,4,5,7,5,3,7,
]

var color =d3.interpolateHsl("blue","yellow"); //青から黄色にHSLカラー空間で補間する
var maxValue=d3.max(dataset); //最大値を求める

var heatmap =d3.select("#mygraph")
.selectAll("rect") //
.data(dataset)

heatmap.enter()    //
.append("rect")   //四角形・角丸四角形
.attr("class","block") //
.attr("x",function(d,i) { //
return (i % 8) *blocksize; //X座標
})
.attr("y",function(d,i) {
return Math.floor(i/8)*blocksize; //y座標
})
.attr("width",function(d,i) {
return blocksize; //横幅
})
.attr("height",function(d,i) {
return blocksize; //縦幅
})
.style("fill",function(d,i){
return color(d/maxValue); //データからヒートマップに表示する色を求め、表示する
})
.style('opacity',0.3) //透明度 30%
.append("title") //tooltip
.text(function(d){ return d; }) //tooltip

※上記コードの引用先:(超お薦め)
データビジュアライゼーションのためのD3.js徹底入門
https://www.amazon.co.jp/dp/4797368861


var svg = d3.select("#svg-color-quant");
var log = d3.scaleLog()
.domain([ 0.1, 100, 1000 ])
.range(["blue", "yellow"]);
svg.append("g")
.attr("class", "legendLog")
.attr("transform", "translate(20,20)");
var logLegend = d3.legendColor()
.labelFormat(d3.format(".2f"))
.cells([1, 2,3, 4, 5, 6, 7,8,9,10,11,12,13,14,15])
.scale(log);
svg.select(".legendLog")
.call(logLegend);

※上記コードの引用先:(超お薦め)
d3 SVG Legend (v4)
http://d3-legend.susielu.com/

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