source: gs3-extensions/map-editor/DrawingManager/historyManager.js@ 32710

var prevOverlays = [];

function undoMovement() {
    console.log("*** undoMovement called");
    for (var i = 0; i < overlays.length; i++) {
        overlays[i].setMap(null);

    }
    
    overlays = [];
    
    var prev_overlay = prevOverlays.pop();
    
    for (var i = 0; i < prev_overlay.length; i++) {
        overlays[i] = prev_overlay[i];
        overlays[i].setMap(map);
    }
    
}

function clonePath(path)
{
    var clone_path = [];
    
    for (var i = 0; i < path.length; i++) {
        var lati = path.getAt(i).lat();
        var lngi = path.getAt(i).lng();
        clone_lat_lng = {
            lat: lati,
            lng: lngi
        };
        clone_path.push(clone_lat_lng);
    }
    
    return clone_path;
}

function clonePolyline(polyline)
{
    var path          = polyline.getPath();
    var geodesic      = polyline.geodesic;
    var strokeColor   = polyline.strokeColor;
    var strokeOpacity = polyline.strokeOpacity;
    var strokeWeight  = polyline.strokeWeight;
    
    var clone_path    = clonePath(path);
    
    var clone_polyline = new google.maps.Polyline({
        geodesic: geodesic,
        strokeColor: strokeColor,
        strokeOpacity: strokeOpacity,
        strokeWeight: strokeWeight,
        path: clone_path
    });
    
    clone_polyline.type = google.maps.drawing.OverlayType.POLYLINE;
    
    return clone_polyline;
}

function clonePolygon(polygon)
{
    var path          = polygon.getPath();
    var geodesic      = polygon.geodesic;
    var strokeColor   = polygon.strokeColor;
    var strokeOpacity = polygon.strokeOpacity;
    var strokeWeight  = polygon.strokeWeight;
    var fillColor     = polygon.fillColor;
    var fillOpacity   = polygon.fillOpacity;
    
    var clone_path    = clonePath(path);
    
    var clone_polygon = new google.maps.Polygon({
        geodesic: geodesic,
        strokeColor: strokeColor,
        strokeOpacity: strokeOpacity,
        strokeWeight: strokeWeight,
        fillColor: fillColor,
        fillOpacity: fillOpacity,
        path: clone_path
    });
    
    clone_polygon.type = google.maps.drawing.OverlayType.POLYGON;
    
    return clone_polygon;
}

function cloneRectangle(rect)
{
    var strokeColor   = rect.strokeColor;
    var strokeOpacity = rect.strokeOpacity;
    var strokeWeight  = rect.strokeWeight;
    var fillColor     = rect.fillColor;
    var fillOpacity   = rect.fillOpacity;
    var bounds        = rect.getBounds();
    
    var clone_rect = new google.maps.Rectangle({
        strokeColor: strokeColor,
        strokeOpacity: strokeOpacity,
        strokeWeight: strokeWeight,
        fillColor: fillColor,
        fillOpacity: fillOpacity,
        bounds: bounds
    });
    
    clone_rect.type = google.maps.drawing.OverlayType.RECTANGLE;
    
    return clone_rect;
}

function cloneCircle(circ)
{
    var strokeColor   = circ.strokeColor;
    var strokeOpacity = circ.strokeOpacity;
    var strokeWeight  = circ.strokeWeight;
    var fillColor     = circ.fillColor;
    var fillOpacity   = circ.fillOpacity;
    var center        = circ.center;
    var radius        = circ.radius;
    
    var clone_circ = new google.maps.Circle({
        strokeColor: strokeColor,
        strokeOpacity: strokeOpacity,
        strokeWeight: strokeWeight,
        fillColor: fillColor,
        fillOpacity: fillOpacity,
        center: center,
        radius: radius
    });
    
    clone_circ.type = google.maps.drawing.OverlayType.CIRCLE;
    
    return clone_circ;
}


function cloneShape(shape)
{
    if (shape.type === google.maps.drawing.OverlayType.POLYLINE) {
        var clone_polyline = clonePolyline(shape);
        return clone_polyline;
    }
    else if (shape.type === google.maps.drawing.OverlayType.POLYGON) {
        var clone_polygon = clonePolygon(shape);
        return clone_polygon;
    }
    else if (shape.type === google.maps.drawing.OverlayType.RECTANGLE) {
        var clone_rect = cloneRectangle(shape);
        return clone_rect;
    
    }
    else if (shape.type === google.maps.drawing.OverlayType.CIRCLE) {
        var clone_circ = cloneCircle(shape);
        return clone_circ;
    
    }
    else {
        console.error("Unrecognized shape: " + shape);
        return null;
    }
}

function historyOverlayPush()
{
    console.log("historyOverlayPush()");
    var overlays_copy = [];
    for (var i = 0; i<overlays.length; i++) {
        var clone_shape = cloneShape(overlays[i]);
        
        google.maps.event.addListener(clone_shape, 'click', function () {
            setSelection(clone_shape);
        });
            
        overlays_copy[i] = clone_shape;
        
    }
    
    prevOverlays.push(overlays_copy); 
}