D3 Examples - Lasso selection for Force-Directed Graph

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<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
    .links line {
        stroke: #999;
        stroke-opacity: 0.6;
    }
​
    .nodes circle {
        stroke: #fff;
        stroke-width: 1.5px;
    }
​
    .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: red;
    }
​
</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="d3-lasso.min.js"></script>
<script src="force_lasso.js"></script>
    