根据我在文档和示例中看到的内容,我可以通过填充样式编辑所有具有相同功能的顶点。
我想确定多边形创建的顺序。
有没有办法给每个顶点一个不同的颜色/唯一编号?
是的,不同的颜色、半径、zIndex 或任何其他样式设置:
function styles(feature) {
var multipoint = new ol.geom.MultiPoint(feature.getGeometry().getCoordinates()[0]);
var styles = [
new ol.style.Style({
stroke: new ol.style.Stroke({
color: 'blue',
width: 3
}),
fill: new ol.style.Fill({
color: 'rgba(0, 0, 255, 0.1)'
})
})
];
multipoint.getCoordinates().forEach(function(coordinates, index, arr) {
var shade = (index+1)*50;
var radius = (index+5)*3;
var zIndex = 10-index;
var text = index < arr.length-1 ? String.fromCharCode('A'.charCodeAt(0) + index) : '';
styles.push(new ol.style.Style({
zIndex: zIndex,
image: new ol.style.Circle({
radius: radius,
fill: new ol.style.Fill({
color: 'rgba(' + shade + ',' + shade + ', 0, 1)'
})
}),
text: new ol.style.Text({
text: text,
font: 'bold 24px sans-serif',
fill: new ol.style.Fill({
color: 'red'
}),
stroke: new ol.style.Stroke({
color: 'white',
width: 4
}),
}),
geometry: new ol.geom.Point(coordinates)
}));
});
return styles;
}
var geojsonObject = {
'type': 'FeatureCollection',
'crs': {
'type': 'name',
'properties': {
'name': 'EPSG:3857'
}
},
'features': [{
'type': 'Feature',
'geometry': {
'type': 'Polygon',
'coordinates': [[[-5e6, 6e6], [-5e6, 8e6], [-3e6, 8e6],
[-3e6, 6e6], [-5e6, 6e6]]]
}
}, {
'type': 'Feature',
'geometry': {
'type': 'Polygon',
'coordinates': [[[-2e6, 6e6], [-2e6, 8e6], [0, 8e6],
[0, 6e6], [-2e6, 6e6]]]
}
}, {
'type': 'Feature',
'geometry': {
'type': 'Polygon',
'coordinates': [[[1e6, 6e6], [1e6, 8e6], [3e6, 8e6],
[3e6, 6e6], [1e6, 6e6]]]
}
}, {
'type': 'Feature',
'geometry': {
'type': 'Polygon',
'coordinates': [[[-2e6, -1e6], [-1e6, 1e6],
[0, -1e6], [-2e6, -1e6]]]
}
}]
};
var source = new ol.source.Vector({
features: (new ol.format.GeoJSON()).readFeatures(geojsonObject)
});
var layer = new ol.layer.Vector({
source: source,
style: styles
});
var map = new ol.Map({
layers: [layer],
target: 'map',
view: new ol.View({
center: [0, 3000000],
zoom: 2
})
});
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.6.5/ol.css" type="text/css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/openlayers/4.6.5/ol.js"></script>
<div id="map" class="map"></div>
在您的代码中,我认为如果您将选定和未选定处理分开,会更容易理解。 此外,如果您打算处理线串,则获取坐标略有不同。
let multiPoint;
const style = [new Style({ // stroke and fill for linestring/polygon
fill: this.getFill(colorObject, 0.2),
stroke: this.getStroke(colorObject),
})];
// return the coordinates of the linestring or first ring of the polygon
const coordinates = type != 'Polygon' ? feature1.getGeometry().getCoordinates() : feature1.getGeometry().getCoordinates()[0];
multiPoint = new MultiPoint(coordinates);
if (geometryIndex === IS_SELECTED) { // if this shape selected - new color for each vertex
multiPoint.getCoordinates().forEach((coordinatesV, index) => {
style.push(new Style({
image: new CircleStyle({
radius: 5,
fill: this.getFill(this.getColorObject(index), 1)
}),
geometry: new Point(coordinatesV)
}));
});
} else { // shape not selected - all vertices to have same color ?
style.push(new Style({
image: new CircleStyle({
radius: 5,
fill: this.getFill(colorObject, 1)
}),
geometry: multiPoint
}));
}
return style;