how to modified the image options for fabric.js background image on the canvas in angular 8

Question

I am using fabric.js library to set an image background but can not get references

canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', 
canvas.renderAll.bind(canvas), {
 width: canvas.width,
height: canvas.height,
  // Needed to position backgroundImage at 0/0
  originX: 'left',
  originY: 'top'
 });

I am using this function but there is not a property for canvas.width while I get a canvas.getWidth() but it is not working like this .. as well as this is also not working with my case :(

 canvas.setBackgroundImage('images/download.jpg', canvas.renderAll.bind(canvas), 
    {
        backgroundImageOpacity: 0.5,
        backgroundImageStretch: true 
      // above both option are not valid with my case  
    });

Answer 1

You need to set opacity and scale of image object instead of backgroundImageOpacity, backgroundImageStretch .

 var canvas = window._canvas = new fabric.Canvas('c'); fabric.Image.fromURL('https://picsum.photos/200/300', (img) => { img.set({ opacity: 0.5, scaleX: canvas.width/img.width, scaleY: canvas.height/img.height, }); canvas.setBackgroundImage(img, canvas.requestRenderAll.bind(canvas)); });

 canvas { border: 1px solid #999; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.4.0/fabric.js"></script> <canvas id="c" width="600" height="600"></canvas>