wwwtyro / space-2d Goto Github PK

//addition to the canvas settings in bundle.js
var canvas = document.getElementById('render-canvas');
var glContextAttributes = { preserveDrawingBuffer: true };
var gl = canvas.getContext("experimental-webgl", glContextAttributes);
canvas.width = 2560; //window.innerWidth - (300 + 16 + 16 + 16);
canvas.height = 1440; //window.innerHeight - (16 + 16);

//download img as png on canvas click
  (function() {
    var canvas = document.querySelector("#render-canvas");
    var uri;
    canvas.onclick = function(evt) {
      evt.preventDefault();
      canvas.toBlob(function(blob) {
        if(uri)
          (window.URL||window.webkitURL).revokeObjectURL(uri);
        uri = (window.URL||window.webkitURL).createObjectURL(blob);
        var a = document.createElement('a');
        a.href = uri;
        a.download="stars.png";
        document.body.appendChild(a);
        a.onclick = function(evt) { this.parentNode.removeChild(this); }
        a.click();
      });
    }
  })();