html2canvas/src/Queue.js

function h2cRenderContext(width, height) {
  var storage = [];
  return {
    storage: storage,
    width: width,
    height: height,
    fillRect: function () {
      storage.push({
        type: "function",
        name: "fillRect",
        'arguments': arguments
      });
    },
    drawShape: function() {

      var shape = [];

      storage.push({
        type: "function",
        name: "drawShape",
        'arguments': shape
      });

      return {
        moveTo: function() {
          shape.push({
            name: "moveTo",
            'arguments': arguments
          });
        },
        lineTo: function() {
          shape.push({
            name: "lineTo",
            'arguments': arguments
          });
        },
        bezierCurveTo: function() {
          shape.push({
            name: "bezierCurveTo",
            'arguments': arguments
          });
        },
        quadraticCurveTo: function() {
          shape.push({
            name: "quadraticCurveTo",
            'arguments': arguments
          });
        }
      };

    },
    drawImage: function () {
      storage.push({
        type: "function",
        name: "drawImage",
        'arguments': arguments
      });
    },
    fillText: function () {
      storage.push({
        type: "function",
        name: "fillText",
        'arguments': arguments
      });
    },
    setVariable: function (variable, value) {
      storage.push({
        type: "variable",
        name: variable,
        'arguments': value
      });
    }
  };
}