TudorandClaude Opus 4.8
2de1c4e766
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A first-choice offer rate sitting on the y-max ceiling (100%) was drawn flush against the top of the plot area, clipping the point marker. Add 8px top layout padding and clip:false so ceiling values render in full, without introducing a misleading >100% tick. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
92 lines
2.8 KiB
TypeScript
92 lines
2.8 KiB
TypeScript
'use client';
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/**
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* AdmissionsTrendChart
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* Compact line chart of the first-choice offer rate across admissions years.
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* Renders nothing unless at least two years carry an offer-rate value.
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*/
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import { Line } from 'react-chartjs-2';
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import { ChartOptions } from 'chart.js';
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import '@/lib/chartSetup';
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import { formatAcademicYear } from '@/lib/utils';
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import type { SchoolAdmissions } from '@/lib/types';
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import styles from './AdmissionsTrendChart.module.css';
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export default function AdmissionsTrendChart({ history }: { history: SchoolAdmissions[] }) {
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const pts = history.filter((h) => h.first_preference_offer_pct != null);
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if (pts.length < 2) return null;
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const labels = pts.map((p) => formatAcademicYear(p.year));
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const values = pts.map((p) => p.first_preference_offer_pct as number);
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const lastIdx = pts.length - 1;
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// Auto-scale with headroom so variation is visible, clamped to 0–100.
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const lo = Math.min(...values);
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const hi = Math.max(...values);
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const padded = Math.max(5, Math.round((hi - lo) * 0.25));
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const yMin = Math.max(0, Math.floor((lo - padded) / 5) * 5);
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const yMax = Math.min(100, Math.ceil((hi + padded) / 5) * 5);
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const options: ChartOptions<'line'> = {
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responsive: true,
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maintainAspectRatio: false,
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interaction: { mode: 'index', intersect: false },
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// Headroom so a point sitting on the y-max ceiling (e.g. 100%) isn't
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// clipped by the top of the plot area.
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layout: { padding: { top: 8 } },
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plugins: {
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legend: { display: false },
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title: { display: false },
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tooltip: {
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backgroundColor: 'rgba(26,22,18,0.92)',
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padding: 10,
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titleFont: { size: 12 },
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bodyFont: { size: 12 },
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callbacks: {
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label: (ctx) => (ctx.parsed.y == null ? '' : `First-choice offers: ${Math.round(ctx.parsed.y)}%`),
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},
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},
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},
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scales: {
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y: {
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min: yMin,
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max: yMax,
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grid: { color: 'rgba(0,0,0,0.05)' },
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ticks: { font: { size: 11 }, maxTicksLimit: 5, callback: (v) => `${v}%` },
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},
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x: {
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grid: { display: false },
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ticks: { font: { size: 11 }, autoSkip: true, maxRotation: 0, autoSkipPadding: 16 },
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},
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},
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};
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const data = {
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labels,
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datasets: [
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{
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label: 'First-choice offer rate',
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data: values,
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clip: false as const,
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borderColor: '#e07256',
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backgroundColor: 'rgba(224,114,86,0.10)',
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borderWidth: 2.5,
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tension: 0.3,
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fill: true,
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pointRadius: pts.map((_, i) => (i === lastIdx ? 5 : 3)),
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pointBackgroundColor: '#e07256',
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pointBorderColor: '#fff',
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pointBorderWidth: pts.map((_, i) => (i === lastIdx ? 2 : 0)),
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pointHoverRadius: 6,
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},
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],
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};
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return (
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<div className={styles.wrapper}>
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<Line data={data} options={options} />
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</div>
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);
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}
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