d3.lasso example - scatterplot

.block

license: mit

README.md

forked from skokenes's block: d3.lasso example - scatterplot to answer SO question

d3-lasso.min.js

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"+s+" "+u,v=[t,n],d=[s,u],b.attr("cx",s).attr("cy",u).attr("r",7).attr("display",null)):h=h+" L "+s+" "+u,p.push([t,n]);var l=Math.sqrt(Math.pow(t-v[0],2)+Math.pow(n-v[1],2)),f="M "+s+" "+u+" L "+d[0]+" "+d[1];_.attr("d",h),m.attr("d",f),a=l<=e,a&&o?m.attr("display",null):m.attr("display","none"),r.nodes().forEach(function(t){t.__lasso.loopSelect=!(!a||!o)&&c(p,t.__lasso.lassoPoint)<1,t.__lasso.possible=t.__lasso.hoverSelect||t.__lasso.loopSelect}),i.draw()}function f(){r.on("mouseover.lasso",null),r.nodes().forEach(function(t){t.__lasso.selected=t.__lasso.possible,t.__lasso.possible=!1}),_.attr("d",null),m.attr("d",null),b.attr("display","none"),i.end()}var h,v,d,p,g=t.append("g").attr("class","lasso"),_=g.append("path").attr("class","drawn"),m=g.append("path").attr("class","loop_close"),b=g.append("circle").attr("class","origin"),M=d3.drag().on("start",u).on("drag",l).on("end",f);n.call(M)}var n,r=[],e=75,o=!0,a=!1,s=!0,i={start:function(){},draw:function(){},end:function(){}};return t.items=function(n){if(!arguments.length)return r;r=n;var e=r.nodes();return e.forEach(function(t){t.__lasso={possible:!1,selected:!1}}),t},t.possibleItems=function(){return r.filter(function(){return this.__lasso.possible})},t.selectedItems=function(){return r.filter(function(){return this.__lasso.selected})},t.notPossibleItems=function(){return r.filter(function(){return!this.__lasso.possible})},t.notSelectedItems=function(){return r.filter(function(){return!this.__lasso.selected})},t.closePathDistance=function(n){return arguments.length?(e=n,t):e},t.closePathSelect=function(n){return arguments.length?(o=n===!0,t):o},t.isPathClosed=function(n){return arguments.length?(a=n===!0,t):a},t.hoverSelect=function(n){return arguments.length?(s=n===!0,t):s},t.on=function(n,r){if(!arguments.length)return i;if(1===arguments.length)return i[n];var e=["start","draw","end"];return e.indexOf(n)>-1&&(i[n]=r),t},t.targetArea=function(r){return arguments.length?(n=r,t):n},t}var a=e(function(t){function 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b>x||-b>x?b:w(t,n,r,e)}];h()}),c=e(function(t){function n(t,n){for(var e=n[0],o=n[1],a=t.length,s=1,i=a,u=0,l=a-1;u<i;l=u++){var f=t[u],c=t[l],h=f[1],v=c[1];if(v<h){if(v<o&&o<h){var d=r(f,c,n);if(0===d)return 0;s^=0<d|0}else if(o===h){var p=t[(u+1)%a],g=p[1];if(h<g){var d=r(f,c,n);if(0===d)return 0;s^=0<d|0}}}else if(h<v){if(h<o&&o<v){var d=r(f,c,n);if(0===d)return 0;s^=d<0|0}else if(o===h){var p=t[(u+1)%a],g=p[1];if(g<h){var d=r(f,c,n);if(0===d)return 0;s^=d<0|0}}}else if(o===h){var _=Math.min(f[0],c[0]),m=Math.max(f[0],c[0]);if(0===u){for(;l>0;){var b=(l+a-1)%a,M=t[b];if(M[1]!==o)break;var y=M[0];_=Math.min(_,y),m=Math.max(m,y),l=b}if(0===l)return _<=e&&e<=m?0:1;i=l+1}for(var w=t[(l+a-1)%a][1];u+1<i;){var M=t[u+1];if(M[1]!==o)break;var y=M[0];_=Math.min(_,y),m=Math.max(m,y),u+=1}if(_<=e&&e<=m)return 0;var x=t[(u+1)%a][1];e<_&&w<o!=x<o&&(s^=1)}}return 2*s-1}t.exports=n;var r=f});t.lasso=o,Object.defineProperty(t,"__esModule",{value:!0})});

index.html

<html>
<head>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script src="d3-lasso.min.js"></script>
    <style>
      @import url('https://fonts.googleapis.com/css?family=Open+Sans+Condensed:300');
      @import url("https://fonts.googleapis.com/css?family=Lato:300");
      text {
          font-family: "Open Sans Condensed";
      } 
      .axis path {
          stroke: black;
      }

      .tick line {
          visibility: hidden;
      }

      .border {
          margin-top: 9px;
          margin-left: 29px;
          border: .5px solid black;
          width: 325px;
          height: 335px;
          position: absolute;
      }

      .lasso path {
          stroke: rgb(80,80,80);
          stroke-width:2px;
      }

      .lasso .drawn {
          fill-opacity:.05 ;
      }

      .lasso .loop_close {
          fill:none;
          stroke-dasharray: 4, 4;
      }

      .lasso .origin {
          fill:#3399FF;
          fill-opacity:.5;
      }

      .not_possible {
          fill:rgb(200,200,200);
      }

      .possible {
          fill:#EC888C;
      }
      
      .selected {
        fill: steelblue;
      }
    </style>
</head>
<body>
    <script>
      var data = [["Arsenal",-0.0032967741593940836, 0.30399753945657115],["Chelsea", 0.2752159801936051, -0.0389675484210763], ["Liverpool",-0.005096951348655329, 0.026678627680541075], ["Manchester City",-0.004715381791104284, -0.12338379196523988], ["Manchester United",0.06877966010653305, -0.0850615090351779], ["Tottenham",-0.3379518099485709, -0.09933664174939877]];

      const colours = d3.scaleOrdinal()
          .domain(data)
          .range(["#F8B195", "#F67280", "#C06C84", "#6C5B7B", "#355C7D", "#2A363B"]);

      var canvasW = 675;
      var canvasH = 400;   
      var w = 365;
      var h = 365;
      var xPadding = 30;
      var yPadding = 20;
      var padding = 10;

      var xScale = d3.scaleLinear()
          .range([xPadding, w - padding])
          .domain([-1, 1]);

      var yScale = d3.scaleLinear()
          .range([h - yPadding, padding])
          .domain([-1, 1]);

      var svg = d3.select('body')
          .append("svg")
          .attr('width', canvasW)
          .attr('height', canvasH);

      var lasso_start = function() {
          lasso.items()
              .attr("r",7) 
              .classed("not_possible",true)
              .classed("selected",false);
      };

      var lasso_draw = function() {

          lasso.possibleItems()
              .classed("not_possible",false)
              .classed("possible",true);

          lasso.notPossibleItems()
              .classed("not_possible",true)
              .classed("possible",false);
      };

      var lasso_end = function() {
          lasso.items()
              .classed("not_possible",false)
              .classed("possible",false);

          lasso.selectedItems()
              .classed("selected",true)
              .attr("r",7);

          lasso.notSelectedItems()
              .attr("r",3.5);

      };

      var circles = svg.selectAll("circle")
          .data(data)
          .enter()
          .append("circle")
          .attr("r", 7)
          .attr("cx", function(d) { return xScale(d[1]); })
          .attr("cy", function(d) { return yScale(d[2]); })
          .attr("fill", function(d) {
            var result = null;

            if (data.indexOf(d) >= 0) {
              result = colours(d);
            } else {
              result = "white";
            }
            return result;               
          });

      var legend = svg.selectAll(".legend")
          .data(colours.domain())
          .enter()
          .append("g")
          .attr("class", "legend")
          .attr("transform", function(d, i) { return "translate(0," + i * 29 + ")"; });

      legend.append("rect")
          .attr("x", canvasW - 184)
          .attr("y", 11)
          .attr("width", 18)
          .attr("height", 18)
          .style("fill", colours);

      legend.append("text")
          .attr("x", canvasW - 194)
          .attr("y", 20)
          .attr("dy", ".35em")
          .style("text-anchor", "end")
          .text(function(d) { return d[0];})


      var lasso = d3.lasso()
          .closePathDistance(75) 
          .closePathSelect(true) 
          .targetArea(svg)
          .items(circles) 
          .on("start",lasso_start) 
          .on("draw",lasso_draw) 
          .on("end",lasso_end); 

      svg.call(lasso);
    </script>
</body>
</html>