h5 web透かしSDKの実装コード例

size: font size
color: font color
id: canvasId
text: text content
density: spacing
clarity: clarity
supportTip: Text tips not supported by Canvas

  let body = document.getElementsByTagName('body');
    let canvas = document.createElement('canvas');
    canvas.style.cssText= 'position: fixed;width: 100%;height: 100%;left:0;top:0;z-index: -1;';
    body[0].appendChild(canvas);

 let canvas = document.getElementById(this.params.id);
      let cxt = canvas.getContext('2d');
      let times = window.screen.width * this.params.clarity / this.params.density;// horizontal text fill times
      let heightTimes = window.screen.height * this.params.clarity * 1.5/ this.params.density; // vertical text fill times
      cxt.rotate(-15*Math.PI/180); //tilt the canvas
   
      for(let i = 0; i < times; i++) {
        for(let j = 0; j < heightTimes; j++) {
          cxt.fillStyle = this.params.color;
          cxt.font = this.params.size + ' Arial';
          cxt.fillText(this.params.text, this.params.density*i, j*this.params.density);
        }
      }

  let self = this;
    window.setInterval(function(){
    if (!document.getElementById(self.params.id)) {
    self._init();
    }
    }, 1000);

  var gulp = require('gulp'),
        uglify = require("gulp-uglify"),
        babel = require("gulp-babel");
    gulp.task('minify', function () {
        return gulp.src('. /src/index.js') // the js file to be minified
        .pipe(babel())
        .pipe(uglify())
        .pipe(gulp.dest('. /dist')); //compressed path
    });