58 lines
1.5 KiB
Dart
58 lines
1.5 KiB
Dart
/// Normalized rectangle (0–1) on the receipt photo for review highlights.
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library;
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class ReceiptBounds {
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const ReceiptBounds({
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required this.left,
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required this.top,
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required this.right,
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required this.bottom,
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});
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final double left;
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final double top;
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final double right;
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final double bottom;
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bool get isEmpty => right <= left || bottom <= top;
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ReceiptBounds union(ReceiptBounds other) {
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if (isEmpty) return other;
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if (other.isEmpty) return this;
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return ReceiptBounds(
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left: left < other.left ? left : other.left,
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top: top < other.top ? top : other.top,
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right: right > other.right ? right : other.right,
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bottom: bottom > other.bottom ? bottom : other.bottom,
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);
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}
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static ReceiptBounds? merge(Iterable<ReceiptBounds> bounds) {
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ReceiptBounds? merged;
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for (final box in bounds) {
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if (box.isEmpty) continue;
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merged = merged == null ? box : merged.union(box);
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}
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return merged;
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}
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static ReceiptBounds fromPixelRect({
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required double left,
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required double top,
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required double right,
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required double bottom,
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required double imageWidth,
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required double imageHeight,
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}) {
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if (imageWidth <= 0 || imageHeight <= 0) {
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return const ReceiptBounds(left: 0, top: 0, right: 0, bottom: 0);
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}
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return ReceiptBounds(
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left: left / imageWidth,
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top: top / imageHeight,
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right: right / imageWidth,
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bottom: bottom / imageHeight,
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);
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}
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}
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