如何使用 openlayers 2.13 使功能适合页面绑定？

Question

我想要 select 功能，然后使功能适合页面绑定。

我使用这个代码：

selected.geometry.resize(2, origin);

我的代码是 selected 的两倍，但我希望 selected 适合页面绑定。我不知道如何计算 scale 并在上面的代码中放置 2。

有人可以帮助我吗？

Answer 1

我找到了答案：

function fitToScale(){

    minBoundX=vectors.selectedFeatures[0].geometry.getBounds().left;
    minBoundY=vectors.selectedFeatures[0].geometry.getBounds().bottom;
    maxBoundX=vectors.selectedFeatures[0].geometry.getBounds().right;
    maxBoundY=vectors.selectedFeatures[0].geometry.getBounds().top;
    for(i=0 ; i &lt; vectors.selectedFeatures.length ; i++){
        gBound = vectors.selectedFeatures[i].geometry.getBounds();
        if(minBoundX>gBound.left){
            minBoundX=gBound.left;
        }
        if(minBoundY>gBound.bottom){
            minBoundY=gBound.bottom;
        }
        if(maxBoundX&lt;gBound.right){
            maxBoundX=gBound.right;
        }
        if(maxBoundY&lt;gBound.top){
            maxBoundY=gBound.top;
        }
    }
    var mBound = map.getExtent();
    var dx1=maxBoundX-minBoundX;
    var dy1=maxBoundY-minBoundY;
    var dx2=mBound.right-mBound.left;
    var dy2=mBound.top-mBound.bottom;
    var area1=dx2/dx1;
    var area2=dy2/dy1;
    var min;

    if(area1&lt;area2){
        min=area1;
    } else{
        min=area2;
    }
    console.log(min);
    var x=(maxBoundX+minBoundX)/2;
    var y=(maxBoundY+minBoundY)/2;
    origin = new OpenLayers.Geometry.Point(x,y);
    for(i=0;i&lt;vectors.selectedFeatures.length;i++ ){
        selected = vectors.selectedFeatures[i];
        pLine=[];
        for(j=0;j&lt;selected.geometry.getVertices().length;j++ ){
            pLine.push(selected.geometry.getVertices()[j]);
        }
        pLine.push(origin);
        newLine=new OpenLayers.Feature.Vector(new OpenLayers.Geometry.LineString(pLine));
        vectors.addFeatures(newLine);
        newLine.geometry.resize(min, origin);
        vectors.removeFeatures(newLine);
        vectors.redraw();
    }
}

如何使用 openlayers 2.13 使功能适合页面绑定？

How to fit feature to page bound using openlayers2.13?

openlayers