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July 29, 2025 19:55
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| class _RiskIndicatorPainter extends CustomPainter { | |
| final double risk; | |
| final Color color; | |
| const _RiskIndicatorPainter({required this.risk, required this.color}); | |
| @override | |
| void paint(Canvas canvas, Size size) { | |
| const strokeWidth = 8.0; | |
| final radius = (size.shortestSide - strokeWidth) / 2; | |
| final center = Offset(size.width / 2, size.height / 2); | |
| final rect = Rect.fromCircle(center: center, radius: radius); | |
| final backgroundPaint = | |
| Paint() | |
| ..color = color.withValues(alpha: 0.20) | |
| ..style = PaintingStyle.stroke | |
| ..strokeWidth = strokeWidth | |
| ..strokeCap = StrokeCap.round; | |
| final progressPaint = | |
| Paint() | |
| ..color = color | |
| ..style = PaintingStyle.stroke | |
| ..strokeWidth = strokeWidth | |
| ..strokeCap = StrokeCap.round; | |
| const gapDeg = 10.0; | |
| final capDeg = (strokeWidth / 2) / radius * 180 / math.pi; | |
| final halfGap = (gapDeg / 2) + capDeg; | |
| void drawSegment(double startDeg, double endDeg) { | |
| double sweep = endDeg - startDeg; | |
| if (sweep < 0) sweep += 360; | |
| canvas.drawArc( | |
| rect, | |
| _deg2rad(startDeg), | |
| _deg2rad(sweep), | |
| false, | |
| backgroundPaint, | |
| ); | |
| } | |
| drawSegment(-90 + halfGap, 30 - halfGap); | |
| drawSegment(30 + halfGap, 150 - halfGap); | |
| drawSegment(150 + halfGap, 270 - halfGap); | |
| final segments = <List<double>>[ | |
| [-90 + halfGap, 30 - halfGap], | |
| [30 + halfGap, 150 - halfGap], | |
| [150 + halfGap, 270 - halfGap], | |
| ]; | |
| final totalStartDeg = -90.0; | |
| final totalEndDeg = 270.0; | |
| final clamped = risk.clamp(0.0, 1.0); | |
| final progressEndDeg = | |
| totalStartDeg + (totalEndDeg - totalStartDeg) * clamped; | |
| for (final seg in segments) { | |
| final segStart = seg[0]; | |
| final segEnd = seg[1]; | |
| final start = math.max(segStart, totalStartDeg); | |
| final end = math.min(segEnd, progressEndDeg); | |
| if (end > start) { | |
| canvas.drawArc( | |
| rect, | |
| _deg2rad(start), | |
| _deg2rad(end - start), | |
| false, | |
| progressPaint, | |
| ); | |
| } | |
| } | |
| final fillPaint = | |
| Paint() | |
| ..color = color.withValues(alpha: 0.10) | |
| ..style = PaintingStyle.fill; | |
| canvas.drawCircle(center, radius - strokeWidth * 1.2, fillPaint); | |
| } | |
| double _deg2rad(double d) => d * math.pi / 180.0; | |
| @override | |
| bool shouldRepaint(covariant _RiskIndicatorPainter old) => old.risk != risk; | |
| } |
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