OpenLayers选择多边形的功能

Question

试图使用此 - http://openlayers.org/dev/examples/SLDSelect.html 例如： 我有选择功能（框），允许我选择图层上的功能。但它是盒式的。 现在我正在尝试做出同样的选择，但与多边形样式。就像绘制新的多边形一样，但是多边形内部会选择什么。 我是不是在寻找正确的路径试图使用这个SLD选择还是还有其他更好的方法？

任何解决方案。

谢谢。

Answer 1

从GIS StackEchange网站：

function buildIt() {//START FUNCTION buildIt 

//CREATE A NEW EMPTY VECTOR LAYER 
var polygonAdHoc = new OpenLayers.Layer.Vector("Poly Layer"); 
//ADD THE NEW VECTOR LAYER TO THE OPENLAYERS MAP 
map.addLayer(polygonAdHoc); 
//SET A VARIABLE TO THE NAME OF THE EXISTING LAYER THAT WILL BE TESTED FOR INTERSECTION WITH THE USER CREATED POLYGON 
//I CHOSE TO GET THE LAYER BY NAME BUT YOU MIGHT CHOOSE TO DO IT ANOTHER WAY 
var standLyr = map.getLayersByName("nameOfTheVectorLayerYouWantToTestForIntersection"); 

//CREATE A DRAW FEATURE CONTROL FOR THE USER CREATED VECTOR LAYER 
var draw = new OpenLayers.Control.DrawFeature(polygonAdHoc, OpenLayers.Handler.Polygon); 
//ADD THE DRAW FEATURE CONTROL TO THE MAP 
map.addControl(draw); 
//ACTIVATE THE DRAW FEATURE CONTROL 
draw.activate(); 

//WHEN THE USER FINISHES DRAWING THE AD-HOC POLYGON THE beforefeatureadded EVENT WILL FIRE 
polygonAdHoc.events.on({ 
    beforefeatureadded: function (event) { 
     poly = event.feature.geometry;//SET A VARIABLE TO THE USERDRAWN POLYGONS GEOMETRY 
     //alert("polygonAdHoc.features[0].geometry: " + poly);//IF YOU WANT TO SEE THE GEOMETRY COORDINATES UNCOMMENT THIS LINE 
     for (var a = 0; a < standLyr[0].features.length; a++) {//LOOP THRU THE STANDS FEATURES OF THE LAYER YOU WANT TO TEST FOR INTERSECTION WITH THE USER DRAWN POLYGON 
      if (poly.intersects(standLyr[0].features[a].geometry)) {//IF THE USER DRAWN POLYGON INTERSECTS THE TARGET LAYERS FEATURE REPRESENTED BY THE VARIABLE "a" THEN 
       //IDENTIFY THE FEATURE THAT INTERSECTS 
       //FOR SIMPLICITIES SAKE I CHOSE TO JUST FIRE AN ALERT 
       //MY ACTUAL APP ADDS EACH SELECTED FEATURE TO A SELECT FEATURE CONTROL AND HIGHLIGHTS EACH POLYGON ON THE MAP     
       alert("stands feature intersection: " + standLyr[0].features[a].attributes['nameOfAttribute']); 
      }//END OF IF STATEMENT 
     }//END OF FOR STATEMENT 
     draw.deactivate();//I ONLY WANT THE USER TO BE ABLE TO DRAW ONE AD-HOC POLYGON 
     //SO I DEACTIVATE THE DRAW FEATURE CONTROL AFTER THEY CREATE THE FIRST POLYGON 
     return false; 
    }//END OF beforefeatureadded FUNCTION 
});//END OF polygonAdHoc.events.on 
}//END OF buildIt FUNCTION 

Answer 2

在这种plunker我已经使用interaction.Draw创建一个多边形。多边形完成后，它会找到多边形范围内的所有特征点并选择它们。

Here is a link to the plunker

这里是draw.on('drawend',...听者的摘录：

draw.on('drawend', function(e) { 

    e.preventDefault(); 
    //stop a click select from overriding selection made by polygon 
    setTimeout(function(){ 
    select.setActive(true) 
    },300); 

    // features that intersect the box are added to the collection of 
    // selected features, and their names are displayed in the "info" 
    // div 
    var extent = e.feature.getGeometry().getExtent(); 

    //pointsLayer is the vector layer with the point features 
    pointsLayer.getSource().forEachFeatureIntersectingExtent(extent, function(feature) { 
    selectedFeatures.push(feature); 
    }); 

});