code: function drawLines(node, parent) {
        ctx.save();
        var x = node.offset.x;
        var y = node.offset.y;
        ctx.translate(x, y);
  
        // branch
        if (parent) {
          drawBranch(node, parent);
        }
  
        // bottom border
        if (!node.isRoot()) {
          ctx.fillStyle = node.branchColor;
          var tm = node.textMetrics;
          ctx.fillRect(0, tm.height + padding, tm.width, node.lineWidth);
        }
  
        node.forEachChild(function(child) {
          drawLines(child, node);
        });
  
        ctx.restore();
      }
docs: Draws all branches