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JQVMap.prototype.applyTransform = function () {
  var maxTransX, maxTransY, minTransX, minTransY;
  if (this.defaultWidth * this.scale <= this.width) {
    maxTransX = (this.width - this.defaultWidth * this.scale) / (2 * this.scale);
    minTransX = (this.width - this.defaultWidth * this.scale) / (2 * this.scale);
  } else {
    maxTransX = 0;
    minTransX = (this.width - this.defaultWidth * this.scale) / this.scale;
  }

  if (this.defaultHeight * this.scale <= this.height) {
    maxTransY = (this.height - this.defaultHeight * this.scale) / (2 * this.scale);
    minTransY = (this.height - this.defaultHeight * this.scale) / (2 * this.scale);
  } else {
    maxTransY = 0;
    minTransY = (this.height - this.defaultHeight * this.scale) / this.scale;
  }

  if (this.transY > maxTransY) {
    this.transY = maxTransY;
  } else if (this.transY < minTransY) {
    this.transY = minTransY;
  }
  if (this.transX > maxTransX) {
    this.transX = maxTransX;
  } else if (this.transX < minTransX) {
    this.transX = minTransX;
  }

  this.canvas.applyTransformParams(this.scale, this.transX, this.transY);
};