javascriptnode.jsslicecaironode-canvas

How to use image-slice in node js?


I tried using image-slice to slice into multiple part using node js.

I tried installing npm i image-to-slices, sudo port install cairo, npm i canvas and brew install pkg-config cairo pango libpng jpeg giflib but still show error require node-canvas on the server side node.js

Here is the i have tried to slice image:

 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

Console output error:

 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)

Solution

  • Digging around in the code I found that you can specify which canvas you want to use, through the use of clipperOptions in the configuration.

    Try this:

    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!');
    });