[英]Customize vertex style when selecting features (point, line, polygon) in Openlayers 3?
我試圖通過自定義它們的樣式來顯示openlayers 3中所選特征的頂點。 我已經設法為多邊形做了這個,但是需要動態地對所有要素類型(點,線多邊形)
多邊形的解決方案使用多種樣式,如下所示。
var styleFunction = function() {
return [
new ol.style.Style({
image: new ol.style.Circle({
radius: 5,
fill: new ol.style.Fill({
color: '#00aaff'
}),
stroke: new ol.style.Stroke({color: '#00aaff', width: 2})
}),
geometry: function(feature) {
var coordinates = feature.getGeometry().getCoordinates()[0];
return new ol.geom.MultiPoint(coordinates);
}
}),
new ol.style.Style({
stroke: new ol.style.Stroke({
color: "#00aaff",
width: 3
}),
fill: new ol.style.Fill({
color: "rgba(255,255,255,0.4)"
})
})
]
}
此解決方案適用於多邊形,但在選擇線時頂點不顯示,並且在選擇點時,我的styleFunction完全中斷。
我在點上得到以下錯誤:
TypeError: e is undefined SimpleGeometry.js:196
setLayout SimpleGeometry.js:196
setCoordinates MultiPoint.js:158
e MultiPoint.js:25
geometry (index):128
Ua vector.js:128
Ua vector.js:127
renderFeature VectorLayer.js:404
E VectorLayer.js:353
<anonymous> (index):975
prepareFrame VectorLayer.js:370
renderFrame Map.js:159
renderFrame_ PluggableMap.js:1232
animationDelay_ PluggableMap.js:191
<anonymous> (index):975
任何人都可以幫助我以支持所有功能類型的方式修改styleFunction嗎?
感謝任何線索
處理每種類型的幾何體的方式不同,因為getCoordinates
根據傳遞的幾何體類型返回不同的坐標對象。 檢查一下
var styleFunction = function() {
return [
new ol.style.Style({
image: new ol.style.Circle({
radius: 5,
fill: new ol.style.Fill({
color: '#00aaff'
}),
stroke: new ol.style.Stroke({color: '#00aaff', width: 2})
}),
geometry: function(feature) {
var coordinates;
if (feature.getGeometry().getType() == "LineString"){
coordinates = feature.getGeometry().getCoordinates();
} else if (feature.getGeometry().getType() == "Polygon"){
coordinates = feature.getGeometry().getCoordinates()[0];
} else if (feature.getGeometry().getType() == "Pont"){
//not 100% sure this would work!!!!
coordinates = [feature.getGeometry().getCoordinates()];
} else {
alert("maybe you need to handle also multi geometries");
}
return new ol.geom.MultiPoint(coordinates);
}
}),
new ol.style.Style({
stroke: new ol.style.Stroke({
color: "#00aaff",
width: 3
}),
fill: new ol.style.Fill({
color: "rgba(255,255,255,0.4)"
})
})
]
}
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