69 function drawLigament(a, b) {
 70     const WIDTH_FACTOR = 0.1;
 71     let ligAngle = Math.angleRadians(a, b);
 72     let ligCenter = Math.circupoint(a, a.width, ligAngle);
 73     let ligOpposite = Math.circupoint(b, b.width, Math.angleRadians(b, a));
 74     let ligA = Math.circupoint(a, a.width, ligAngle - Math.PI * WIDTH_FACTOR);
 75     let ligB = Math.circupoint(a, a.width, ligAngle + Math.PI * WIDTH_FACTOR);
 76     //let apex = Math.circupoint(a, a.width * 2, ligAngle);
 77     let apex = ligOpposite;
 78     ctx.beginPath();
 79     //ctx.arc(a.x, a.y, a.width, ligAngle - Math.PI * WIDTH_FACTOR, ligAngle + Math.PI * WIDTH_FACTOR);
 80     ctx.moveTo(ligB.x, ligB.y);
 81     ctx.quadraticCurveTo(ligCenter.x, ligCenter.y, apex.x, apex.y);
 82     ctx.quadraticCurveTo(ligCenter.x, ligCenter.y, ligA.x, ligA.y);
 83     ctx.lineWidth = 1;
 84     ctx.stroke();
 85 
 86     let gradient = ctx.createLinearGradient(ligCenter.x, ligCenter.y, ligOpposite.x, ligOpposite.y);
 87     gradient.addColorStop(0, fillStyleForDepth(a.depth));
 88     gradient.addColorStop(1, fillStyleForDepth(b.depth));
 89     ctx.fillStyle = gradient;
 90     ctx.fill();
 91 }