ffset-class.html">Offset</a></span> <span class="parameter-name">offset</span>: <span class="default-value">Offset.zero</span>, </span> <span class="parameter" id="addPlatformView-param-width"><span class="type-annotation"><a href="dart-core/double-class.html">double</a></span> <span class="parameter-name">width</span>: <span class="default-value">0.0</span></span> <span class="parameter" id="addPlatformView-param-height"><span class="type-annotation"><a href="dart-core/double-class.html">double</a></span> 