getDevicePixelRatio static method

double getDevicePixelRatio()

根据设置 的 宽度 来得到 devicePixelRatio

Implementation

static double getDevicePixelRatio() {
  var originalSize = window.physicalSize / window.devicePixelRatio;
  var originalWidth = originalSize.width;
  var originalHeight = originalSize.height;
  if (originalHeight > originalWidth) {
    // 竖屏
    _devicePixelRatio =
        window.physicalSize.width / AutoSizeUtil._screenStandard;
  } else {
    // 横屏
    _devicePixelRatio =
        window.physicalSize.height / AutoSizeUtil._screenStandard;
  }
  return _devicePixelRatio;
}