Dart中的图像处理 [英] Image processing in Dart

问题描述

我创建了可识别图片元素的应用。
现在我在File类中有图像，我想将图像旋转几度，然后再次在File类中有图像。
有解决方案吗？

I create app which recognize elements from picture. Now I have image in File class and I want to rotate image about few degrees and again have image in File class. Is there any solution how to resolve this?

P.S我不想显示此图像。我必须将图像作为File对象传递给某些方法。

P.S I don't want display this image. I must pass image as File object to some method.

推荐答案

要在内存中旋转实际文件使用图像
库和copyRotate函数。

To rotate the actual file in memory use the image library and the copyRotate function.

Image copyRotate(Image src, num angle, {
   Interpolation interpolation = Interpolation.nearest
  }
);
//Returns a copy of the [src] image, rotated by [angle] degrees.

示例：

import 'dart:io';
import 'package:image/image.dart';
void main() {
  // Read an image from file (webp in this case).
  // decodeImage will identify the format of the image and use the appropriate
  // decoder.
  Image image = decodeImage(File('test.webp').readAsBytesSync());

  Image thumbnail = copyRotate(image, 120);

  // Save the thumbnail as a PNG.
  File('thumbnail.png').writeAsBytesSync(encodePng(thumbnail));
}

源

显示存储的图像的旋转版本，您可以将 RotationTransition 与 AlwaysStoppedAnimation like-

new RotatedBox(
  quarterTurns: 1,
  child: new Text("Lorem ipsum")
)

或 Transform.rotate（）小部件，例如-

  Transform.rotate(angle: - math.pi / 4, child: Text("Text"),);

用于您的用例-

  Transform.rotate(angle: degrees*3.14/180, child: Image.asset("file_path"),);

这篇关于Dart中的图像处理的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！