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220 changes: 220 additions & 0 deletions
220
packages/google_vision_flutter/example/lib/multiple_face_detections.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,220 @@ | ||
| import 'dart:async'; | ||
|
|
||
| import 'package:flutter/material.dart'; | ||
| import 'package:google_vision/google_vision.dart' as gv; | ||
| import 'package:google_vision_flutter/google_vision_flutter.dart'; | ||
|
|
||
| class MultipleFaceDetection extends StatefulWidget { | ||
| const MultipleFaceDetection({super.key, required this.title}); | ||
|
|
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| final String title; | ||
|
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| @override | ||
| State<MultipleFaceDetection> createState() => _MyHomePageState(); | ||
| } | ||
|
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| class _MyHomePageState extends State<MultipleFaceDetection> { | ||
| FutureOr<gv.GoogleVision>? _googleVision; | ||
|
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| static const assetName1 = 'assets/young-man-smiling.jpg'; | ||
|
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| static const assetName2 = 'assets/dj.jpg'; | ||
|
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| final _processImage1 = Image.asset( | ||
| assetName1, | ||
| fit: BoxFit.fitWidth, | ||
| height: 300, | ||
| ); | ||
|
|
||
| final _processImage2 = Image.asset( | ||
| assetName2, | ||
| fit: BoxFit.fitWidth, | ||
| height: 300, | ||
| ); | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
|
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| WidgetsBinding.instance.addPostFrameCallback((_) { | ||
| _getGoogleVision(); | ||
| }); | ||
| } | ||
|
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| FutureOr<void> _getGoogleVision() async { | ||
| _googleVision ??= await GoogleVision.withAsset( | ||
| 'assets/service_credentials.json', | ||
| ); | ||
|
|
||
| setState(() {}); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) => SafeArea( | ||
| child: Scaffold( | ||
| appBar: AppBar( | ||
| leading: IconButton( | ||
| icon: const Icon(Icons.arrow_back, color: Colors.black), | ||
| onPressed: () => Navigator.of(context).pop(), | ||
| ), | ||
| title: Text(widget.title), | ||
| ), | ||
| body: SingleChildScrollView( | ||
| child: Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.start, | ||
| children: [ | ||
| Row( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: [ | ||
| Column(children: [ | ||
| const Padding( | ||
| padding: EdgeInsets.all(8.0), | ||
| child: Text(assetName1), | ||
| ), | ||
| Padding( | ||
| padding: const EdgeInsets.all(8.0), | ||
| child: _processImage1, | ||
| ), | ||
| ]), | ||
| Column(children: [ | ||
| const Padding( | ||
| padding: EdgeInsets.all(8.0), | ||
| child: Text(assetName2), | ||
| ), | ||
| Padding( | ||
| padding: const EdgeInsets.all(8.0), | ||
| child: _processImage2, | ||
| ), | ||
| ]), | ||
| ], | ||
| ), | ||
| const Padding( | ||
| padding: EdgeInsets.all(8.0), | ||
| child: Text( | ||
| 'Processed images will appear below:', | ||
| ), | ||
| ), | ||
| Padding( | ||
| padding: const EdgeInsets.all(8.0), | ||
| child: _googleVision == null | ||
| ? const CircularProgressIndicator() | ||
| : GoogleVisionImageBuilder.faceDetection( | ||
| googleVision: _googleVision!, | ||
| imageProvider: _processImage1.image, | ||
| builder: ( | ||
| BuildContext context, | ||
| List<FaceAnnotation>? faceAnnotations, | ||
| ) => | ||
| CustomPaint( | ||
| foregroundPainter: AnnotationPainter( | ||
| faceAnnotations: faceAnnotations, | ||
| ), | ||
| child: Image(image: _processImage1.image), | ||
| ), | ||
| ), | ||
| ), | ||
| Padding( | ||
| padding: const EdgeInsets.all(8.0), | ||
| child: _googleVision == null | ||
| ? const CircularProgressIndicator() | ||
| : GoogleVisionImageBuilder.faceDetection( | ||
| googleVision: Future.value(_googleVision), | ||
| imageProvider: _processImage2.image, | ||
| builder: ( | ||
| BuildContext context, | ||
| List<FaceAnnotation>? faceAnnotations, | ||
| ) => | ||
| CustomPaint( | ||
| foregroundPainter: AnnotationPainter( | ||
| faceAnnotations: faceAnnotations, | ||
| ), | ||
| child: Image(image: _processImage2.image), | ||
| ), | ||
| ), | ||
| ) | ||
| ], | ||
| ), | ||
| ), | ||
| ), | ||
| ), | ||
| ); | ||
| } | ||
|
|
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| class AnnotationPainter extends CustomPainter { | ||
| final List<FaceAnnotation>? faceAnnotations; | ||
|
|
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| AnnotationPainter({ | ||
| required this.faceAnnotations, | ||
| }); | ||
|
|
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| @override | ||
| void paint( | ||
| Canvas canvas, | ||
| Size size, | ||
| ) { | ||
| // face detection | ||
| for (var faceAnnotation in faceAnnotations!) { | ||
| drawAnnotationsRect( | ||
| vertices: faceAnnotation.boundingPoly.vertices, | ||
| canvas: canvas, | ||
| ); | ||
|
|
||
| drawString( | ||
| text: 'Face - ${(faceAnnotation.detectionConfidence * 100).toInt()}%', | ||
| offset: faceAnnotation.boundingPoly.vertices.first.toOffset(), | ||
| canvas: canvas, | ||
| size: size, | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| void drawString({ | ||
| required String text, | ||
| required Offset offset, | ||
| required Canvas canvas, | ||
| required Size size, | ||
| Color? color, | ||
| }) { | ||
| color ??= Colors.red.shade900; | ||
|
|
||
| final tp = TextPainter( | ||
| text: TextSpan( | ||
| text: text, | ||
| style: TextStyle(color: color), | ||
| ), | ||
| textAlign: TextAlign.left, | ||
| textDirection: TextDirection.ltr, | ||
| ); | ||
|
|
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| tp.layout(); | ||
|
|
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| tp.paint(canvas, offset); | ||
| } | ||
|
|
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| void drawAnnotationsRect({ | ||
| required List<Vertex> vertices, | ||
| required Canvas canvas, | ||
| Color? color, | ||
| double strokeWidth = 1, | ||
| }) { | ||
| color ??= Colors.red.shade400; | ||
|
|
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| final paint = Paint(); | ||
|
|
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| paint.style = PaintingStyle.stroke; | ||
| paint.strokeWidth = strokeWidth; | ||
| paint.color = color; | ||
|
|
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| canvas.drawRect( | ||
| Rect.fromPoints( | ||
| vertices.first.toOffset(), | ||
| vertices[2].toOffset(), | ||
| ), | ||
| paint, | ||
| ); | ||
| } | ||
|
|
||
| @override | ||
| bool shouldRepaint(CustomPainter oldDelegate) => false; | ||
| } |
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