这个函数将返回当前状态，让有限状态机保持在FadeIn状态，直到工具提示的不透明度到达最大不透明度参数。
The function will return the current state, leaving the finite state machine in FadeIn state, until the tooltip's opacity reaches the maximum opacity parameter.
每当在FadeIn状态下发生timetick事件时，handleEvent方法将调用一个函数，它略微增加工具提示的不透明度。
Each time a timetick event occurs in FadeIn state, the handleEvent method will call a function that increases the opacity of the tooltip slightly.
这两种颜色都使用rgba函数来指定“红-绿-蓝”值，以及一个alpha透明度值。
Both of these colors use the rgba function to specify the red-green-blue values, plus an alpha transparency value.
传递函数将体数据灰度值映射为颜色和不透明度，来突出显示特定的组织结构。
Mapping scalar value into a color specification and an opacity value, transfer function could highlight specific structure.
它适用于三维重建过程中用户需要交互式地动态调整透明度变换函数，以观察三维实体的不同细节的应用场合。
It applies to the situation that the user needs to interactively adjust the opacity transfer function to observe the varied details of the3D object.
在医学图像的三维可视化中，不透明度传递函数和观察角度是需要频繁调节的，因此，难以实现实时体绘制。
In the visualization of 3d medical images, it is common to adjust the opacity transfer function and viewing Angle frequently so that volume rendering is difficult to be realized in real-time.
在医学图像的三维可视化中，不透明度传递函数和观察角度是需要频繁调节的，因此，难以实现实时体绘制。
In the visualization of 3d medical images, it is common to adjust the opacity transfer function and viewing Angle frequently so that volume rendering is difficult to be realized in real-time.
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