javascript - 如何在 Node.js 中使用图像切片？

Question

我尝试使用image-slice使用node js切片成多个部分。

我尝试安装npm i image-to-slices、sudo port install cairo、npm i canvas和brew install pkg -config cairo pango libpng jpeg giflib 但仍然在服务器端 Node.js 上显示错误 require node-canvas

这是我尝试切片图像:

 var imageToSlices = require('image-to-slices');

 exports.sliceImage=(request, response)=>{


var lineXArray = [100, 200];
var lineYArray = [100, 200];
var source = './public/images/Bitmap001.png'; // width: 300, height: 300

 imageToSlices(source, lineXArray, lineYArray, {
 saveToDir: './public/images/bit001.png'
 }, function() {
 console.log('the source image has been sliced into 9 sections!');
  });


  }//sliceImage

控制台输出错误:

 Error: Require node-canvas on the server-side Node.js
at ImageClipper.__createImage (/Users/parameshv/pyrky_nodejs/node_modules/image-clipper/lib/clipper.js:456:13)
at ImageClipper.loadImageFromUrl (/Users/parameshv/pyrky_nodejs/node_modules/image-clipper/lib/clipper.js:83:20)
at ImageClipper.image (/Users/parameshv/pyrky_nodejs/node_modules/image-clipper/lib/clipper.js:120:10)
at imageClipper (/Users/parameshv/pyrky_nodejs/node_modules/image-clipper/lib/index.js:36:15)
at ImageToSlices.slice (/Users/parameshv/pyrky_nodejs/node_modules/image-to-slices/lib/image-to-slices.js:212:3)
at ImageToSlicesFactory (/Users/parameshv/pyrky_nodejs/node_modules/image-to-slices/lib/index.js:22:17)
at exports.sliceImage (/Users/parameshv/pyrky_nodejs/app/controllers/ApiController.js:843:1)
at Layer.handle [as handle_request] (/Users/parameshv/pyrky_nodejs/node_modules/express/lib/router/layer.js:95:5)
at next (/Users/parameshv/pyrky_nodejs/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/Users/parameshv/pyrky_nodejs/node_modules/express/lib/router/route.js:112:3)

Answer 1

深入研究代码，我发现您可以通过在配置中使用 clipperOptions 来指定要使用的 canvas 。

试试这个:

var imageToSlices = require('image-to-slices');
var lineXArray = [100, 200];
var lineYArray = [100, 200];
var source = './public/images/Bitmap001.png'; // width: 300, height: 300

imageToSlices(source, lineXArray, lineYArray, {
    saveToDir: '.',
    clipperOptions: {
        canvas: require('canvas')
    }    
}, function() {
    console.log('the source image has been sliced into 9 sections!');
});