sideMarkers/index.html at master · ramotswa/sideMarkers · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;">
    <meta name="apple-mobile-web-app-capable" content="yes">
    <title>OpenLayers WMTS Example</title>
    <script src="http://maps.google.com/maps/api/js?sensor=false&v=3.6"></script>
    <script src="http://openlayers.org/dev/OpenLayers.js" type="text/javascript"></script>
    <style>
        .olControlAttribution
        {
            bottom: 5px;
        }
        .smallmap
        {
            width: 600px;
            height: 600px;
            border: 1px solid #ccc;
            float: left;
        }
    </style>
    <script type="text/javascript">
        var map;
        var mosques;
        var vectorlayer;


        function init() {
           var googleSatellite = new OpenLayers.Layer.Google(
"Google Satellite",
{
    type: google.maps.MapTypeId.SATELLITE,
    sphericalMercator: true,
    projection: "EPSG:900913",
    units: 'm'
}
    );
            var googleRoad = new OpenLayers.Layer.Google(
"Google Road",
{
    type: google.maps.MapTypeId.ROADMAP,
    sphericalMercator: true,
    projection: "EPSG:900913",
    units: 'm'
}
    );
            var googleSatellite = new OpenLayers.Layer.Google(
"Google Satellite",
{
    type: google.maps.MapTypeId.SATELLITE,
    sphericalMercator: true,
    projection: "EPSG:900913",
    units: 'm'
}
    );

vectorlayer = new OpenLayers.Layer.Vector('Vectorlayer', {
    isBaseLayer: false,
     styleMap: new OpenLayers.StyleMap({
        "default": {
            pointRadius: "${distance}",
            strokeColor: "fuchsia",
            strokeWidth: 2,
            fillColor: "lime",
            fillOpacity: 1,
            rotation: "${rotation}",
            backgroundGraphic: "http://www.openlayers.org/dev/img/marker.png",
            backgroundHeight: "${distance}",
            backgroundWidth: "${distance}",
         externalGraphic: "${graphic}"

        },
    "select":{
        fillColor: "#66ccff",
        strokeColor: "#3399ff",
        graphicZIndex: 2,
         pointRadius: 20
    },
     "hover": {
         fillColor: "#66ccff",
         strokeColor: "#3399ff",
         graphicZIndex: 2,
         pointRadius: 20
     }})

});
var select = new OpenLayers.Control.SelectFeature(vectorlayer, { hover: false });


            mosques = new OpenLayers.Layer.Vector("Mosques", {
                projection: new OpenLayers.Projection("EPSG:4326"),
                strategies: [new OpenLayers.Strategy.Fixed()],
                protocol: new OpenLayers.Protocol.HTTP(
    {
        url: "http://www.ramotswa.com/showcase/portal/kml/mosques.kml",
        format: new OpenLayers.Format.KML(
        {
            extractStyles: true,
            extractAttributes: true
        })
    }),
                visibility: true
            });


            map = new OpenLayers.Map({
                controls: [new OpenLayers.Control.Navigation({ documentDrag: true })],
                div: "map",
                allOverlays: true,
                eventListeners: {
                    "move": createMakers
                }

            });
            map.addLayers([googleSatellite, mosques]);
            map.zoomToMaxExtent();
            map.addControl(new OpenLayers.Control.MousePosition({ "numDigits": 2 }));
            map.addControl(select);
            select.activate();

            vectorlayer.events.on(
{
    "featureselected": onFeatureSelect,
    "featureunselected": onFeatureUnselect
});
        }
        var spherical_mercator = new OpenLayers.Projection("EPSG:900913");
        var wgs84 = new OpenLayers.Projection("EPSG:4326");


        function onFeatureSelect(event) {
            var s = event;
            var featCoord = new OpenLayers.LonLat(event.feature.attributes.iX, event.feature.attributes.iY);
            map.panTo(featCoord);
        }

        function onFeatureUnselect(event) {

        }


        function createMakers() {
            var offset = 20;
            var divSize = map.size;
            vectorlayer.removeAllFeatures();
            var middleScreenlonlat = map.getCenter();
            var middleScreenPoint = new OpenLayers.Geometry.Point(middleScreenlonlat.lon, middleScreenlonlat.lat);

            var topLeftPx = map.getLonLatFromViewPortPx(new OpenLayers.Pixel(offset, offset));
            var topRightPx = map.getLonLatFromViewPortPx(new OpenLayers.Pixel(divSize.w - offset, offset));
            var bottomRightPx = map.getLonLatFromViewPortPx(new OpenLayers.Pixel(divSize.w - offset, divSize.h - offset));
            var bottomLeftPx = map.getLonLatFromViewPortPx(new OpenLayers.Pixel(10, divSize.h - offset));

            var topLeftPoint = new OpenLayers.Geometry.Point(topLeftPx.lon, topLeftPx.lat);
            var topRightPoint = new OpenLayers.Geometry.Point(topRightPx.lon, topRightPx.lat);
            var bottomRightPoint = new OpenLayers.Geometry.Point(bottomRightPx.lon, bottomRightPx.lat);
            var bottomLeftPoint = new OpenLayers.Geometry.Point(bottomLeftPx.lon, bottomLeftPx.lat);

            var screenBoundsArray = [topLeftPoint, topRightPoint, bottomRightPoint, bottomLeftPoint, topLeftPoint];
            var screenBoundsLineString = new OpenLayers.Geometry.LineString(screenBoundsArray);
            //var screenPolyFeat = new OpenLayers.Feature.Vector(screenBoundsLineString, null,null);
           // vectorlayer.addFeatures([screenPolyFeat]);
            for (var i = 0; i < mosques.features.length; i++) {

                var currentFeature = mosques.features[i];
                //only show the marker when the feature is not visible
                if (map.getExtent().containsBounds(currentFeature.geometry.bounds)) {
                    //do nothing (yet)
                } else {
                    var pointArray = [middleScreenPoint, currentFeature.geometry];
                    var linear_ring = new OpenLayers.Geometry.LineString(pointArray);
                    var wgs84middle = middleScreenlonlat.clone();
                    wgs84middle.transform(spherical_mercator, wgs84);
                    var wgs84current = currentFeature.clone();
                    wgs84current.geometry.transform(spherical_mercator, wgs84);
                    var angleInDegrees = getBearing(wgs84current.geometry.x, wgs84current.geometry.y, wgs84middle.lon, wgs84middle.lat);

                    var splitArray = linear_ring.splitWith(screenBoundsLineString);

                    var intersectPoint = splitArray[0].components[1].clone();
                    intersectPoint.transform(spherical_mercator, wgs84);

                    //get distance from marker on edge of screen rather than distance from centerpoint.
                    var distance = getDistance(intersectPoint.x, intersectPoint.y, wgs84current.geometry.x, wgs84current.geometry.y);
                    //document.getElementById('output').innerHTML = "Distance: " + distance + "</br>Bearing: " + angleInDegrees;
                    var iconSize;

                    if (distance < 10) { iconSize = 15; } else
                        if (distance < 20) { iconSize = 14; } else
                            if (distance < 40) { iconSize = 13; } else
                                if (distance < 60) { iconSize = 12; } else
                                    if (distance < 80) { iconSize = 11; } else
                                        if (distance < 100) { iconSize = 10; } else
                                            if (distance < 150) { iconSize = 9; } else
                                                if (distance < 200) { iconSize = 8; } else
                                                    if (distance > 200) { iconSize = 5; }


                    document.getElementById('output').innerHTML = "Distance: " + distance + "</br>Bearing: " + angleInDegrees + "</br>Size: "+ iconSize;
                    var markerPoint = new OpenLayers.Feature.Vector(splitArray[0].components[1], { iX: currentFeature.geometry.x, iY: currentFeature.geometry.y, rotation: angleInDegrees, distance: iconSize,  bggraphicsize: iconSize + 5 }, null);
                    vectorlayer.addFeatures([markerPoint]);

                }

        }
            map.addLayer(vectorlayer);

        }

        function getDistance(x1, y1, x2, y2) {
            var DEG2RAD = 0.01745329252;
            var RAD2DEG = 57.29577951308;
            EARTH_RADIUS = 3958.75;
            var distance = 0;
            x1 = x1 * DEG2RAD;
            y1 = y1 * DEG2RAD;
            x2 = x2 * DEG2RAD;
            y2 = y2 * DEG2RAD;

            var a = Math.pow(Math.sin((y2 - y1) / 2.0), 2);
            var b = Math.pow(Math.sin((x2 - x1) / 2.0), 2);
            var c = Math.sqrt(a + Math.cos(y2) * Math.cos(y1) * b);

            distance = 2 * Math.asin(c) * EARTH_RADIUS;
            return distance;

        }

        function getBearing(x1, y1, x2, y2) {
            var bearing = 0;
            var DEG2RAD = 0.01745329252;
            var RAD2DEG = 57.29577951308;
            x1 = x1 * DEG2RAD;
            y1 = y1 * DEG2RAD;
            x2 = x2 * DEG2RAD;
            y2 = y2 * DEG2RAD;

            a = Math.cos(y2) * Math.sin(x2 - x1);
            b = Math.cos(y1) * Math.sin(y2) - Math.sin(y1) * Math.cos(y2) * Math.cos(x2 - x1);
            adjust = 0;

            if ((a == 0) && (b == 0)) {
                bearing = 0;
            } else if (b == 0) {
                if (a < 0)
                    bearing = 3 * Math.PI / 2;
                else
                    bearing = Math.PI / 2;
            } else if (b < 0)
                adjust = Math.PI;
            else {
                if (a < 0)
                    adjust = 2 * Math.PI;
                else
                    adjust = 0;
            }

            bearing = (Math.atan(a / b) + adjust) * RAD2DEG;
           // document.getElementById('output').innerHTML = "A: " + a + "</br>B: " + b + "</br>Degrees: " + bearing;
            return bearing;

        }

    </script>
</head>
<body onload="init();">
    <div id="map" class="smallmap">
    </div>
    <div id="output"></div>
</body>
</html>