Example usage for com.google.gwt.maps.client.geom LatLngBounds intersects

Introduction

In this page you can find the example usage for com.google.gwt.maps.client.geom LatLngBounds intersects.

Prototype

public final native boolean intersects(LatLngBounds other) ;

Source Link

Document

Returns true if the specified rectangle intersects this rectangle.

Usage

From source file:org.maps.client.GMapCreatorTileLayer.java

License:Apache License

@Override
public String getTileURL(Point tile, int zoomLevel) {
    String prefix = getUrlPrefix();
    String secondaryPrefix = getSecondaryPrefix();
    if (zoomLevel >= getSecondaryZoomStart() && secondaryPrefix == null) {
        return prefix + "blank-tile.png";
    } else if (zoomLevel >= getSecondaryZoomStart() && secondaryPrefix != null) {
        prefix = secondaryPrefix;//from w w w . ja  v  a2 s.  c om
    }
    //System.out.println("prefix is: " + prefix);
    final LatLngBounds mapBounds = LatLngBounds.newInstance(LatLng.newInstance(17.884813, -179.14734),
            LatLng.newInstance(71.35256, 179.77847));

    double c = Math.pow(2, zoomLevel);
    double x = 360 / c * tile.getX() - 180;
    double y = 180 - 360 / c * tile.getY();
    double x2 = x + 360 / c;
    double y2 = y - 360 / c;
    double lon = x; // Math.toRadians(x); //would be lon=x+lon0, but lon0=0
    // degrees
    double lat = (2.0 * Math.atan(Math.exp(y / 180 * Math.PI)) - Math.PI / 2.0) * 180 / Math.PI; // in degrees
    double lon2 = x2;
    double lat2 = (2.0 * Math.atan(Math.exp(y2 / 180 * Math.PI)) - Math.PI / 2.0) * 180 / Math.PI; // in degrees
    LatLngBounds tileBounds = LatLngBounds.newInstance(LatLng.newInstance(lat2, lon),
            LatLng.newInstance(lat, lon2));
    if (!tileBounds.intersects(mapBounds)) {
        return prefix + "blank-tile.png";
    }
    ;
    double d = tile.getX();
    double e = tile.getY();
    String f = "t";
    for (int g = 0; g < zoomLevel; g++) {
        c = c / 2;
        if (e < c) {
            if (d < c) {
                f = f + "q";
            } else {
                f = f + "r";
                d -= c;
            }
        } else {
            if (d < c) {
                f = f + "t";
                e -= c;
            } else {
                f = f + "s";
                d -= c;
                e -= c;
            }
        }
    }
    return prefix + f + ".png";
}

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