Source of class.csvggraph.js - Zabbix

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                        py = coord[1][1];
                        pv = point.getAttribute('label');
                        pp = (coord[2][0] - coord[0][0]) / 2;
                        ps = point.getAttribute('data-px');
                    }
                    break;
​
                case 'staircase':
                case 'line':
                    var direction_string = '',
                        label = [],
                        labels = [],
                        data_set = nodes[i].getAttribute('data-set'),
                        data_nodes = nodes[i].childNodes,
                        elmnt_label,
                        cx,
                        cy;
​
                    for (var index = 0, len = data_nodes.length; index < len; index++) {
                        elmnt_label = data_nodes[index].getAttribute('label');
​
                        if (elmnt_label) {
                            label.push(elmnt_label);
                            labels.push(elmnt_label);
​
                            if (data_nodes[index].tagName.toLowerCase() === 'circle') {
                                cx = data_nodes[index].getAttribute('cx');
                                cy = data_nodes[index].getAttribute('cy');
                                direction_string += ' _' + cx + ',' + cy;
                            }
                            else {
                                direction_string += ' ' + data_nodes[index].getAttribute('d');
                            }
                        }
                    }
​
                    label = label.join(',').split(',');
                    labels = labels.join(',').split(',');
​
                    var direction = ED // Edge transforms 'd' attribute.
                            ? direction_string.substr(1).replace(/([ML])\s(\d+)\s(\d+)/g, '$1$2\,$3').split(' ')
                            : direction_string.substr(1).split(' '),
                        index = direction.length,
                        point,
                        point_label;
​
                    while (index) {
                        index--;
                        point = direction[index].substr(1).split(',');
                        point_label = label[data_set === 'line' ? index : Math.ceil(index / 2)];
                        point_label = labels[data_set === 'line' ? index : Math.ceil(index / 2)];
​
                        if (x >= parseInt(point[0]) && point_label !== '') {
                            px = point[0];
                            py = point[1];
                            pv = point_label;
                            break;
                        }
                    }
                    break;
            }