[OpenLayers-Users] Adding a vector feature from WKT

[Derek Watling]

Christopher

I am still in the (re)development stage, implementing OpenLayers and due to
all the dependencies on the page (.NET WebServices /AJAX / obout / GIS
backend...) don't have a page I can link to. Also we run a subscription
service for property information / valuations so don't want to put out a
test site where people could potentially mine data that costs us money to
obtain in the first place.

That said, as I have been refining the map and changed the controls included
on the map. I now get different symptoms when using the
Format.WKT().read(...). Using my own function still works the way I want. I
have refined my original function to include internal holes in a POLYGON and
added a "switch" statement to allow for future extendability, however for
now I only need to handle POLYGONs.

Thank you
Derek

function GeomFromWKT(wkt) {
    var geometry = null;
    if (typeof wkt != 'undefined') {
        var geomType = wkt.substring(0, wkt.indexOf('('));
        switch (geomType) {
            case "POLYGON":
                var aPolygon = new Array();
                var aLinearRings = wkt.substring(9, wkt.length -
2).split('), (');
                for (var lr = 0; lr < aLinearRings.length; lr++) {
                    var geomLR = new OpenLayers.Geometry.LinearRing;
                    var aPoints = aLinearRings[lr].split(', ');
                    for (var pt = 0; pt < aPoints.length; pt++) {
                        var aPt = aPoints[pt].split(' ');
                        var geomPt = new OpenLayers.Geometry.Point(aPt[0],
aPt[1]);
                        geomLR.addComponent(geomPt, pt);
                    }
                    aPolygon[lr] = geomLR;
                }
                geometry = new OpenLayers.Geometry.Polygon(aPolygon);
                break;
        }
    }
    return geometry;
}

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