我有一个充满状态边界“功能”的图层。当用户点击状态时,我想将该状态的特征移动到堆栈顶部(z-index wise)。
export function drawStateBorders() {
$.getJSON('https://www.mapbox.com/mapbox-gl-js/assets/us_states.geojson').then((data) => {
this.stateGeoJSON = data;
this.map
.addSource('states', {
type: 'geojson',
data,
})
.addLayer({
id: 'state-borders',
type: 'line',
source: 'states',
paint: {
'line-color': [
'case', ['boolean', ['feature-state', 'selected'], false],
'#8d8b76',
'#bfe2ab',
],
'line-width': [
'case', ['boolean', ['feature-state', 'selected'], false],
6,
3,
],
},
});
});
}
当我选择状态
export function stateSelected(state) {
const stateFeatures = this.map.queryRenderedFeatures({
layers: ['state-borders'],
filter: [
'==', 'STATE_NAME', state,
],
});
const features = this.stateGeoJSON.features;
const currentFeature = stateFeatures[0];
if (!currentFeature) {
return;
}
// same state
if (currentFeature.id === this.selectedStateId) return;
// move to front HERE ?????
// old selected state
if (this.selectedStateId) {
this.map.setFeatureState({
source: 'states',
id: this.selectedStateId,
}, {
selected: false,
});
}
this.selectedStateId = currentFeature.id;
this.map.setFeatureState({
source: 'states',
id: this.selectedStateId,
}, {
selected: true,
});
}
到目前为止我已经尝试过了
features.splice(features.indexOf(currentFeature), 1);
features.push(currentFeature);
this.map.getSource('states').setData(this.stateGeoJSON);
这似乎对数组做了一些非常疯狂的事情(复制一些状态,删除其他状态)。不知道发生了什么
将状态添加到另一个层是有效的(感谢@AndrewHarvey的建议)。
如果有人对这里感兴趣是我的代码
export function stateSelected(state) {
const features = this.stateGeoJSON.features;
const currentFeature = features.find(s => s.properties.NAME === state);
if (!currentFeature) {
return;
}
// removes active layer
this.removeLayersContaining('state-borders-active');
this.drawActiveStateLayer(currentFeature);
}
export function drawActiveStateLayer(feature) {
this.map
.addLayer({
id: 'state-borders-active',
type: 'line',
source: {
type: 'geojson',
data: feature
},
paint: {
'line-color': '#8d8b76',
'line-width': 6,
},
});
}
export function drawStateBorders() {
$.getJSON('states.json').then((data) => {
this.stateGeoJSON = data;
this.map
.addSource('states', {
type: 'geojson',
data,
})
.addLayer({
id: 'state-borders',
type: 'line',
source: 'states',
paint: {
'line-color': '#bfe2ab',
'line-width': 3,
},
});
});
这也是我正在使用的shapefile:http://eric.clst.org/assets/wiki/uploads/Stuff/gz_2010_us_040_00_500k.json