fabric.js用PNG模式填充SVG或PNG

Question

I'm currently trying to use the fabric.js library to fill a PNG or a SVG with a pattern. I tried to get some inspiration from there , but couldn't make it work as it is explained.

Here is my pattern:

Here is my PNG template (can't upload SVG, but it's here . And the SVG is white):

// GET AND INIT CANVAS (400x400)
canvas = new fabric.Canvas('canvas');

// MY PATHS
let patternURL = "../images/background1.jpg";
let SVGURL = "../svg/test.svg";

// CREATE MY SVG ELEMENT
fabric.loadSVGFromURL(SVGURL, function(objects, options) {
    // CREATE MY PATTERN IMAGE
    fabric.Image.fromURL(patternURL, function(patternImage) {
        svg = fabric.util.groupSVGElements(objects, options);
        svg = svg.set({"opacity": 1});
        svg.getObjects().forEach(function(e) {
            // IF I DON'T USE THIS LINE, THE SVG REMAIN WHITE
            e.fill = patternImage
        });

        canvas.add(svg);
    });
});

Here is what I have after the execution of my code:

NB: I can move the PNG, and if I add canvas.add(patternImage); before adding the SVG, I get this result:

(so the pattern is loaded as it should).

I think I'm getting pretty close, must be missing the KEY line in the code. Do you have any helpful information or could redirect me into the right place?

EDIT: Here is the (sort of, I just did it on paint) background I wish to obtain :

Answer 1

You need to create another canvas for your pattern. And use that in fabric.Pattern and then use that pattern object to fill.

fabric.loadSVGFromURL(SVGURL, function(objects, options) {
  fabric.Image.fromURL(patternURL, function(patternImage) {
    svg = fabric.util.groupSVGElements(objects, options);
    var patternSourceCanvas = new fabric.StaticCanvas();
    patternSourceCanvas.add(patternImage);
    patternSourceCanvas.setDimensions({
      width: patternImage.getScaledWidth(),
      height: patternImage.getScaledHeight()
    });
    patternSourceCanvas.renderAll();
    var pattern = new fabric.Pattern({
        source: patternSourceCanvas.getElement()
      },
      function(patternObj) {
        svg.getObjects().forEach(function(e) {
          e.fill = patternObj
        });
        canvas.add(svg);
      });
  })
})