d3.lasso example - scatterplot

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>
        circle {
            fill-opacity: 0.5;
        }

        .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 = new Array(100).fill(null).map(m=>[Math.random(),Math.random()]);
        var w = 960;
        var h = 500;
        var r = 3.5;

        var svg = d3.select("body").append("svg")
            .attr("width",w)
            .attr("height",h);
        
        var circles = svg.selectAll("circle")
            .data(data)
            .enter()
            .append("circle")
            .attr("cx",d=>d[0]*w)
            .attr("cy",d=>d[1]*h)
            .attr("r",r);
        
        // Lasso functions
        var lasso_start = function() {
            lasso.items()
                .attr("r",3.5) // reset size
                .classed("not_possible",true)
                .classed("selected",false);
        };

        var lasso_draw = function() {
        
            // Style the possible dots
            lasso.possibleItems()
                .classed("not_possible",false)
                .classed("possible",true);

            // Style the not possible dot
            lasso.notPossibleItems()
                .classed("not_possible",true)
                .classed("possible",false);
        };

        var lasso_end = function() {
            // Reset the color of all dots
            lasso.items()
                .classed("not_possible",false)
                .classed("possible",false);

            // Style the selected dots
            lasso.selectedItems()
                .classed("selected",true)
                .attr("r",7);

            // Reset the style of the not selected dots
            lasso.notSelectedItems()
                .attr("r",3.5);

        };
        
        var lasso = d3.lasso()
            .closePathSelect(true)
            .closePathDistance(100)
            .items(circles)
            .targetArea(svg)
            .on("start",lasso_start)
            .on("draw",lasso_draw)
            .on("end",lasso_end);
        
        svg.call(lasso);
    </script>
</body>
</html>