<%
var _s = (locals.series || []).map(function (v) { return (v == null || isNaN(v)) ? null : Number(v); });
var _lab = locals.labels || [];
var _spn = locals.spans || _lab;
var _inv = !!locals.invert;
var _nm = locals.name || '';
var _fmt = locals.fmt || function (v) { return String(v); };
var _real = _s.filter(function (v) { return v != null; });
%>
<% if (_real.length < 2) { %>
<%= _real.length ? 'One reading so far' : 'Not measured yet' %>
<% } else { %>
<%
var W = 260, H = 40, PAD = 5;
var lo = Math.min.apply(null, _real), hi = Math.max.apply(null, _real);
var span = hi - lo;
var yOf = function (v) {
if (span === 0) return H / 2;
var t = (v - lo) / span;
if (_inv) t = 1 - t;
return +(PAD + (1 - t) * (H - PAD * 2)).toFixed(1);
};
var xOf = function (i) { return _s.length < 2 ? 0 : +((i / (_s.length - 1)) * W).toFixed(1); };
var segs = [], cur = [];
_s.forEach(function (v, i) {
if (v == null) { if (cur.length) segs.push(cur); cur = []; return; }
cur.push({ x: xOf(i), y: yOf(v) });
});
if (cur.length) segs.push(cur);
var firstIdx = -1, lastIdx = -1;
_s.forEach(function (v, i) { if (v != null) { if (firstIdx < 0) firstIdx = i; lastIdx = i; } });
var _from = _s[firstIdx], _to = _s[lastIdx];
var _better = _inv ? (_to < _from) : (_to > _from);
var _worse = _inv ? (_to > _from) : (_to < _from);
var _dir = _to === _from ? 'flat' : (_better ? 'up' : 'down');
var _gid = 'spk' + Math.random().toString(36).slice(2, 9);
function monotoneBody(p) {
var n = p.length;
if (n < 2) return '';
if (n === 2) return 'L' + p[1].x.toFixed(1) + ',' + p[1].y.toFixed(1);
var dx = [], dy = [], slope = [];
for (var i = 0; i < n - 1; i++) {
dx.push(p[i + 1].x - p[i].x);
dy.push(p[i + 1].y - p[i].y);
slope.push(dx[i] === 0 ? 0 : dy[i] / dx[i]);
}
var m = [slope[0]];
for (var i = 1; i < n - 1; i++) {
m.push(slope[i - 1] * slope[i] <= 0 ? 0 : (slope[i - 1] + slope[i]) / 2);
}
m.push(slope[n - 2]);
for (var i = 0; i < n - 1; i++) {
if (slope[i] === 0) { m[i] = 0; m[i + 1] = 0; continue; }
var a = m[i] / slope[i], b = m[i + 1] / slope[i];
if (a < 0) m[i] = 0;
if (b < 0) m[i + 1] = 0;
var sq = a * a + b * b;
if (sq > 9) { var tau = 3 / Math.sqrt(sq); m[i] = tau * a * slope[i]; m[i + 1] = tau * b * slope[i]; }
}
var body = '';
for (var i = 0; i < n - 1; i++) {
var p0 = p[i], p1 = p[i + 1];
var cx1 = p0.x + dx[i] / 3, cy1 = p0.y + m[i] * dx[i] / 3;
var cx2 = p1.x - dx[i] / 3, cy2 = p1.y - m[i + 1] * dx[i] / 3;
body += 'C' + cx1.toFixed(1) + ',' + cy1.toFixed(1) + ' ' + cx2.toFixed(1) + ',' + cy2.toFixed(1)
+ ' ' + p1.x.toFixed(1) + ',' + p1.y.toFixed(1) + ' ';
}
return body;
}
function linePath(p) { return 'M' + p[0].x.toFixed(1) + ',' + p[0].y.toFixed(1) + ' ' + monotoneBody(p); }
function areaPath(p) {
return 'M' + p[0].x.toFixed(1) + ',' + H + ' L' + p[0].x.toFixed(1) + ',' + p[0].y.toFixed(1) + ' '
+ monotoneBody(p) + ' L' + p[p.length - 1].x.toFixed(1) + ',' + H + ' Z';
}
var pts = [];
_s.forEach(function (v, i) {
if (v == null) return;
var prev = null;
for (var k = i - 1; k >= 0; k--) { if (_s[k] != null) { prev = _s[k]; break; } }
pts.push({
x: xOf(i),
label: _lab[i] || ('#' + (i + 1)),
rows: [{ k: _nm, v: _fmt(v), y: yOf(v), c: 'var(--spark)',
d: prev == null ? null : +(v - prev).toFixed(2) }]
});
});
var _fillSeg = segs.length ? segs[segs.length - 1] : null;
%>
<%= _spn[firstIdx] || '' %> to <%= _spn[lastIdx] || '' %>
<%= _dir === 'flat' ? 'no change' : ('from ' + _fmt(_from) + ' to ' + _fmt(_to)) %>
<% } %>