85 lines
2.8 KiB
Dart
85 lines
2.8 KiB
Dart
import 'dart:math' as math;
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import 'package:flutter/material.dart';
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/// Live-Positionsmarker der Drohne im Fly-Modus (Doku 3.10), Papierflieger-
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/// Form aus design/B_paperplane.svg - nativ als [CustomPainter] statt als
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/// SVG-Asset nachgebaut (Format bewusst geaendert: die drei Pfade sind
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/// einfache Dreiecke, eine zusaetzliche SVG-Renderer-Abhaengigkeit lohnt sich
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/// dafuer nicht, siehe auch mountain_peak_icon.dart/wind_arrow_icon.dart fuer
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/// dasselbe Muster). Zeigt unrotiert (Spitze nach oben) bei fehlendem
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/// [headingDeg], sonst im Uhrzeigersinn um den Kurs ueber Grund gedreht.
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class DroneMarkerIcon extends StatelessWidget {
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const DroneMarkerIcon({super.key, this.size = 40, this.headingDeg});
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final double size;
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/// Kurs ueber Grund in Grad (0 = Norden, im Uhrzeigersinn) aus
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/// TelemetryFrame.headingDeg.
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final double? headingDeg;
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@override
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Widget build(BuildContext context) {
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return Transform.rotate(
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angle: (headingDeg ?? 0) * math.pi / 180,
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child: CustomPaint(
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size: Size.square(size),
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painter: const _PaperPlanePainter(),
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),
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);
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}
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}
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class _PaperPlanePainter extends CustomPainter {
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const _PaperPlanePainter();
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// 1:1 aus design/B_paperplane.svg uebernommene Koordinaten (viewBox
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// 0 0 200 200): Spitze oben, zwei Fluegel unten, Heckkerbe dazwischen.
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static const _viewBoxSize = 200.0;
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static const _nose = Offset(100, 22);
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static const _rightWing = Offset(164, 172);
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static const _tailNotch = Offset(100, 138);
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static const _leftWing = Offset(36, 172);
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static const _rightFill = Color(0xFFFF2E93);
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static const _leftFill = Color(0xFFB01464);
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static const _strokeWidth = 7.0;
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@override
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void paint(Canvas canvas, Size size) {
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final scale = size.width / _viewBoxSize;
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Offset s(Offset p) => p * scale;
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final rightHalf = Path()
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..moveTo(s(_nose).dx, s(_nose).dy)
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..lineTo(s(_rightWing).dx, s(_rightWing).dy)
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..lineTo(s(_tailNotch).dx, s(_tailNotch).dy)
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..close();
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final leftHalf = Path()
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..moveTo(s(_nose).dx, s(_nose).dy)
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..lineTo(s(_leftWing).dx, s(_leftWing).dy)
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..lineTo(s(_tailNotch).dx, s(_tailNotch).dy)
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..close();
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canvas.drawPath(rightHalf, Paint()..color = _rightFill);
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canvas.drawPath(leftHalf, Paint()..color = _leftFill);
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final outline = Path()
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..moveTo(s(_nose).dx, s(_nose).dy)
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..lineTo(s(_rightWing).dx, s(_rightWing).dy)
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..lineTo(s(_tailNotch).dx, s(_tailNotch).dy)
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..lineTo(s(_leftWing).dx, s(_leftWing).dy)
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..close();
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canvas.drawPath(
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outline,
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Paint()
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..color = Colors.white
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..style = PaintingStyle.stroke
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..strokeWidth = _strokeWidth * scale
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..strokeJoin = StrokeJoin.round,
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);
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}
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@override
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bool shouldRepaint(covariant _PaperPlanePainter oldDelegate) => false;
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}
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