Question

我正在使用getFeatureById()添加标记并更改其位置。有没有类似的方法来更新样式和图标以设置功能而不使用openlayers-3再次创建它？

目前我这样做：

function addArrowMarker(lat, long, angle, pointerimgsrc, arrowFlag) {

    iconFeature = new ol.Feature({
        geometry: new ol.geom.Point(ol.proj.transform([+long, +lat], 'EPSG:4326', 'EPSG:3857')),
        name: 'NULL'
    });

    iconFeature.setId('arrowMarkerFeature');

    iconStyle = new ol.style.Style({
        image: new ol.style.Icon({
            src: pointerimgsrc,
            rotateWithView: true,
            rotation: angle * Math.PI / 180,
            anchor: [.5, .5],
            anchorXUnits: 'fraction', anchorYUnits: 'fraction',
            opacity: 1
        })
    });

    iconFeature.setStyle(iconStyle);

    vectorArrowSource[arrowFlag] = new ol.source.Vector({
        features: [iconFeature]
    });

    vectorArrowLayer[arrowFlag] = new ol.layer.Vector({
        source: vectorArrowSource[arrowFlag]
    });

    map.addLayer(vectorArrowLayer[arrowFlag]);
}

现在如果角度有任何变化，我会调用该函数并再次设置一个新样式，如下所示。

function changeArrowMarker(lat, long, angle, pointerimgsrc,arrowFlag) {    
    var myFeature = vectorArrowSource[arrowFlag].getFeatureById('arrowMarkerFeature');
    myFeature.getGeometry().setCoordinates(ol.proj.transform([+long, +lat], 'EPSG:4326', 'EPSG:3857'));

    iconStyle = new ol.style.Style({
        image: new ol.style.Icon({
            src: pointerimgsrc,
            rotateWithView: true,
            rotation: angle * Math.PI / 180,
            anchor: [.5, .5],
            anchorXUnits: 'fraction', anchorYUnits: 'fraction',
            opacity: 1
        })
    });

    myFeature.setStyle(iconStyle);
}

我有更好的方法。请帮忙!!

Answer 1

样式是不可变的，所以正确的方式改变＆＃34;他们是取代他们。

但是，根据您的需要，您应该考虑使用Style Function

function addArrowMarker(lat, long, angle, pointerimgsrc, arrowFlag) {
    iconFeature = new ol.Feature({
        geometry: new ol.geom.Point(ol.proj.transform([+long, +lat], 'EPSG:4326', 'EPSG:3857')),
        name: 'NULL',
        angle: angle
    });

    iconFeature.setId('arrowMarkerFeature');

    iconStyleFunction = function(resolution){
        return [new ol.style.Style({
            image: new ol.style.Icon({
                src: pointerimgsrc,
                rotateWithView: true,
                rotation: this.get('angle') * Math.PI / 180,
                anchor: [.5, .5],
                anchorXUnits: 'fraction', anchorYUnits: 'fraction',
                opacity: 1
            })
        })];
    };

    iconFeature.setStyle(iconStyleFunction);

    vectorArrowSource[arrowFlag] = new ol.source.Vector({
        features: [iconFeature]
    });

    vectorArrowLayer[arrowFlag] = new ol.layer.Vector({
        source: vectorArrowSource[arrowFlag]
    });

    map.addLayer(vectorArrowLayer[arrowFlag]);
}

这样，风格总是根据＆＃34;角度＆＃34;功能的属性。要移动或旋转几何/图标，请使用以下内容：

function changeArrowMarker(lat, long, angle, arrowFlag) {
    var myFeature = vectorArrowSource[arrowFlag].getFeatureById('arrowMarkerFeature');
    myFeature.getGeometry().setCoordinates(ol.proj.transform([+long, +lat], 'EPSG:4326', 'EPSG:3857'));
    myFeature.set('angle', angle);
}

使用ol3更改图标样式（Openlayers 3）

1 个答案: