81 lines
2.1 KiB
Dart
81 lines
2.1 KiB
Dart
import 'package:flutter/material.dart';
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class ThermalHeatmap extends StatelessWidget {
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final List<double> temperatures;
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const ThermalHeatmap({super.key, required this.temperatures});
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@override
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Widget build(BuildContext context) {
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return Center(
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child: SizedBox(
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width: 300,
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height: 300,
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child: CustomPaint(
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painter: _ThermalPainter(temperatures),
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),
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),
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);
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}
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}
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class _ThermalPainter extends CustomPainter {
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final List<double> temps;
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_ThermalPainter(this.temps);
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@override
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void paint(Canvas canvas, Size size) {
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final cellWidth = size.width / 8;
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final cellHeight = size.height / 8;
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final blurPaint = Paint()
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..isAntiAlias = true
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..maskFilter = const MaskFilter.blur(BlurStyle.normal, 2);
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for (int y = 0; y < 8; y++) {
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for (int x = 0; x < 8; x++) {
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int i = y * 8 + x;
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double temp = i < temps.length ? temps[i] : 0.0;
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final color = _getColorForTemp(temp);
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final rect = Rect.fromLTWH(
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x * cellWidth,
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y * cellHeight,
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cellWidth,
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cellHeight,
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);
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canvas.drawRect(rect, blurPaint..color = color.withOpacity(0.95));
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}
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}
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final center = Offset(size.width / 2, size.height / 2);
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final plusPaint = Paint()
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..color = Colors.white.withOpacity(0.95)
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..strokeWidth = 2
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..strokeCap = StrokeCap.round;
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canvas.drawLine(center - const Offset(10, 0), center + const Offset(10, 0), plusPaint);
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canvas.drawLine(center - const Offset(0, 10), center + const Offset(0, 10), plusPaint);
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}
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Color _getColorForTemp(double t) {
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double norm = ((t - 20) / 20).clamp(0.0, 1.0);
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return HSVColor.lerp(
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HSVColor.fromColor(Colors.blue),
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HSVColor.fromColor(Colors.red),
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norm,
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)!
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.toColor();
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}
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@override
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bool shouldRepaint(covariant _ThermalPainter oldDelegate) {
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if (oldDelegate.temps.length != temps.length) return true;
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for (int i = 0; i < temps.length; i++) {
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if (oldDelegate.temps[i] != temps[i]) return true;
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}
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return false;
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}
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}
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