Cara Nugel Gambar ing Tengah Flutter- Pandhuan Sederhana

Tambah pratelan impor sing dibutuhake kanggo image paket kasebut:

import 'dart:io';  
import 'package:image/image.dart' as img;  
import 'package:path_provider/path_provider.dart';  

Nggawe fungsi kanggo motong lan nyimpen gambar tengah:

Future<void> cropAndSaveCenteredImage(String imagePath, double cropWidth, double cropHeight, String fileName) async {  
  // Read the image from the file path  
  File imageFile = File(imagePath);  
  List<int> imageBytes = await imageFile.readAsBytes();  
  img.Image image = img.decodeImage(imageBytes);  
  
  // Calculate the center position for cropping  
  int centerX = image.width ~/ 2;  
  int centerY = image.height ~/ 2;  
  
  // Calculate the crop rectangle based on the center position  
  int cropX =(centerX- cropWidth ~/ 2).clamp(0, image.width);  
  int cropY =(centerY- cropHeight ~/ 2).clamp(0, image.height);  
  
  // Crop the image  
  img.Image croppedImage = img.copyCrop(image, cropX, cropY, cropWidth.toInt(), cropHeight.toInt());  
  
  // Get the document directory to save the image  
  Directory directory = await getApplicationDocumentsDirectory();  
  String filePath = '${directory.path}/$fileName.png';  
  
  // Save the image to file  
  File file = File(filePath);  
  await file.writeAsBytes(img.encodePng(croppedImage));  
  
  // Display the file path  
  print('Image saved to: $filePath');  
}  

Telpon fungsi kasebut kanthi path file gambar, jembaré potong, dhuwur potong, lan jeneng berkas sing dikarepake:

void main() async {  
  // Replace 'image_path.png' with the actual path of your image file  
  String imagePath = 'image_path.png';  
  
  // Define the desired crop width and height  
  double cropWidth = 200.0;  
  double cropHeight = 200.0;  
  
  // Define the desired filename(without the extension)  
  String fileName = 'cropped_image';  
  
  // Crop and save the centered image with the specified filename  
  await cropAndSaveCenteredImage(imagePath, cropWidth, cropHeight, fileName);  
}  

Priksa manawa kanggo ngganti 'image_path.png' karo path nyata kanggo file gambar. Kode kasebut bakal maca gambar kasebut, ngetung posisi tengah, nggawe persegi panjang potong ing sakubenge, banjur potong gambar kasebut nggunakake image paket kasebut. Gambar sing dipotong bakal disimpen minangka file gambar PNG anyar kanthi jeneng berkas khusus ing direktori dokumen aplikasi. Path file bakal dicithak ing console kanggo referensi sampeyan.

Maneh, elinga nggunakake penanganan kesalahan sing cocog lan priksa nilai null nalika nggarap file lan gambar.