49 lines
1.5 KiB
Dart
49 lines
1.5 KiB
Dart
/// Month-grid helpers for the transactions heatmap.
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library;
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DateTime dateOnly(DateTime date) => DateTime(date.year, date.month, date.day);
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DateTime monthStart(DateTime date) => DateTime(date.year, date.month);
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bool isSameDay(DateTime a, DateTime b) =>
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a.year == b.year && a.month == b.month && a.day == b.day;
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bool isSameMonth(DateTime a, DateTime b) =>
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a.year == b.year && a.month == b.month;
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DateTime addMonths(DateTime month, int delta) =>
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DateTime(month.year, month.month + delta);
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/// Monday-first calendar cells for [month], padded with nulls to full weeks.
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List<DateTime?> monthGrid(DateTime month) {
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final start = DateTime(month.year, month.month, 1);
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final daysInMonth = DateTime(month.year, month.month + 1, 0).day;
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final leading = start.weekday - DateTime.monday;
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final cells = <DateTime?>[
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...List<DateTime?>.filled(leading, null),
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for (var day = 1; day <= daysInMonth; day++)
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DateTime(month.year, month.month, day),
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];
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while (cells.length % 7 != 0) {
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cells.add(null);
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}
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return cells;
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}
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/// How many transactions landed on each calendar day.
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Map<DateTime, int> txCountsByDay(Iterable<DateTime> dates) {
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final counts = <DateTime, int>{};
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for (final date in dates) {
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final key = dateOnly(date);
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counts[key] = (counts[key] ?? 0) + 1;
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}
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return counts;
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}
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/// GitHub-style 0–4 intensity from a transaction count.
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int heatmapLevel(int count) {
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if (count <= 0) return 0;
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if (count >= 4) return 4;
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return count;
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}
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