81 lines
2.2 KiB
Dart
81 lines
2.2 KiB
Dart
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import 'dart:io';
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import 'dart:math' as math;
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import 'dart:typed_data';
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import 'dart:ui';
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import 'package:image/image.dart' as img;
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import 'coin_detector.dart';
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class CropResult {
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const CropResult({
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required this.bytes,
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required this.width,
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required this.height,
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required this.usedDetection,
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});
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final Uint8List bytes;
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final int width;
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final int height;
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final bool usedDetection;
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}
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/// Circular crop of the detected coin (square output with transparent-ish bg).
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class CoinCropper {
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static Future<CropResult> cropAndCorrect({
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required String imagePath,
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CoinBox? box,
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double padding = 0.12,
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}) async {
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final raw = await File(imagePath).readAsBytes();
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var decoded = img.decodeImage(raw);
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if (decoded == null) {
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throw StateError('Failed to decode image: $imagePath');
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}
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decoded = img.bakeOrientation(decoded);
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final usedDetection = box != null;
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final center = box?.effectiveCenter ??
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Offset(decoded.width / 2, decoded.height / 2);
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var radius = box?.effectiveRadius ??
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math.min(decoded.width, decoded.height) * 0.35;
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radius *= (1 + padding);
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final size = (radius * 2).round().clamp(32, 2048);
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final out = img.Image(width: size, height: size, numChannels: 4);
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img.fill(out, color: img.ColorRgba8(0, 0, 0, 0));
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final r2 = radius * radius;
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for (var y = 0; y < size; y++) {
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for (var x = 0; x < size; x++) {
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final dx = x + 0.5 - size / 2;
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final dy = y + 0.5 - size / 2;
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if (dx * dx + dy * dy > r2) continue;
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final sx = (center.dx + dx).round();
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final sy = (center.dy + dy).round();
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if (sx < 0 || sy < 0 || sx >= decoded.width || sy >= decoded.height) {
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continue;
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}
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final p = decoded.getPixel(sx, sy);
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out.setPixelRgba(x, y, p.r.toInt(), p.g.toInt(), p.b.toInt(), 255);
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}
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}
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const outSize = 320;
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final resized = img.copyResize(
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out,
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width: outSize,
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height: outSize,
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interpolation: img.Interpolation.cubic,
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);
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final bytes = Uint8List.fromList(img.encodePng(resized));
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return CropResult(
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bytes: bytes,
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width: resized.width,
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height: resized.height,
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usedDetection: usedDetection,
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);
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}
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}
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