# fsMapViewSetWeatherRadarColorAlphaEnabled<no value>
This function can be used to enable the use of alpha channel values for rain rate colors set by [`fsMapViewSetWeatherRadarRainColors`](../fsmapviewsetweatherradarraincolors/). Applies to weather radar maps in the horizontal ([`FS_MAP_VIEW_WEATHER_RADAR_MODE_HORIZONTAL`](../fsmapviewsetweatherradarmode/#remarks)) and vertical ([`FS_MAP_VIEW_WEATHER_RADAR_MODE_VERTICAL`](../fsmapviewsetweatherradarmode/#remarks)) mode. By default, this is disabled and alpha values are ignored (set to 1). For alpha blending information, see [Remarks](#remarks).


##### Syntax

``` wasm
bool fsMapViewSetWeatherRadarColorAlphaEnabled(
    FsContext ctx,
    FsTextureId id,
    bool bEnabled
);
```


##### Members

{{< table-wrapper >}}

| Parameters | Description |
| --- | --- |
| `ctx` | A value of type `FsContext` provided as an argument of the gauge callback. |
| `id` | The MapView render ID as returned by the function [`fsMapViewCreate`](../fsmapviewcreate/). |
| `bEnabled` | Whether the alpha channel should be enabled or not. |

{{< /table-wrapper >}}


##### Return Values

Returns `false` if:

-   no texture matches the given MapView ID
-   the `ctx` is invalid

Otherwise it will return `true`.


##### Remarks

In order to get correct alpha blending (for rain rate colors with alpha values different than 0 and 1), the map view must be created with the [`FS_RENDER_IMAGE_PREMULTIPLIED`](../fsmapviewcreate/#remarks) image flag.