zh/builder/src/zrender3/graphic/Pattern.js

var Pattern = function (image, repeat) {
  // Should do nothing more in this constructor. Because gradient can be
  // declard by `color: {image: ...}`, where this constructor will not be called.
  this.image = image;
  this.repeat = repeat; // Can be cloned

  this.type = 'pattern';
};

Pattern.prototype.getCanvasPattern = function (ctx) {
  return ctx.createPattern(this.image, this.repeat || 'repeat');
};

export default Pattern;