【QT】QT的学习：qml中Mapboxgl中相关参数的介绍

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本文详细介绍了在Mapbox中如何正确设置地图样式，包括如何避免样式覆盖问题，以及如何通过ARGB格式设置MapPolyline的颜色，实现透明度效果。提供了Qt环境下加载Mapbox样式的方法和示例。

（1）添加额外样式的时候：

PluginParameter {
            name: "mapboxgl.mapping.additional_style_urls"
            value: "mapbox://styles/mapbox/dark-v9,mapbox://styles/mapbox/satellite-v9"
        }

不能分开写，第二个会覆盖第一个样式，如下是错误的：

PluginParameter {
            name: "mapboxgl.mapping.additional_style_urls"
            value: "mapbox://styles/mapbox/dark-v9"
        }

PluginParameter {
            name: "mapboxgl.mapping.additional_style_urls"
            value: "mapbox://styles/mapbox/satellite-v9"
        }

如何设置map的样式呢：

mainMap.activeMapType = mainMap.supportedMapTypes[index]

其中：

如下是qt加载的mapbogl自带的：index从0开始：

qml: mainmap style description is  Streets
qml: mainmap style description is  Basic
qml: mainmap style description is  Bright
qml: mainmap style description is  Outdoors
qml: mainmap style description is  Satellite
qml: mainmap style description is  Satellite Streets
qml: mainmap style description is  Light
qml: mainmap style description is  Dark， name is： mapbox://styles/mapbox/dark-v9
qml: mainmap style description is  Navigation Preview Day
qml: mainmap style description is  Navigation Preview Night
qml: mainmap style description is  Navigation Guidance Day
qml: mainmap style description is  Navigation Guidance Night

加上两个类型后：
qml: mainmap style description is  User provided style
qml: mainmap style description is  User provided style
qml: mainmap style description is  Streets
qml: mainmap style description is  Basic
qml: mainmap style description is  Bright
qml: mainmap style description is  Outdoors
qml: mainmap style description is  Satellite
qml: mainmap style description is  Satellite Streets
qml: mainmap style description is  Light
qml: mainmap style description is  Dark
qml: mainmap style description is  Navigation Preview Day
qml: mainmap style description is  Navigation Preview Night
qml: mainmap style description is  Navigation Guidance Day
qml: mainmap style description is  Navigation Guidance Night

（２）修改MapPolyline的颜色lineColor：如果想要使用透明度，可使用：ARGB

　　　ARGB 依次代表透明度（alpha）、红色(red)、绿色(green)、蓝色(blue)。