source: gs3-extensions/map-editor/DrawingManager/checkpt26/historyManager.js@ 32723

var prevOverlays = [];
var presentOverlays = [];
var undoneOverlays = [];

function undo() {
    
    for (var i = 0; i < overlays.length; i++) {
        overlays[i].setMap(null);

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

    }

    //Deactivated at the moment
    if (enableSelectionFeature) {
        selectedShapes = [];
        var i = 0;
        var lastEntry = prevOverlays[prevOverlays.length - 1][i];
        console.log(prevOverlays[prevOverlays.length - 1].length);

        for (var i = 0; i < lastEntry.length; i++) {
            selectedShapes.push(prevOverlays)
            console.log("comes here");
        }

    }
}

function redo() {
    
    if (undoneOverlays.length != 0) {
        selectedShapes = [];
        for (var i = 0; i < overlays.length; i++) {
            overlays[i].setMap(null);
        }
        overlays = [];
        var lastEntry = undoneOverlays[undoneOverlays.length - 1];
        for (var i = 0; i < lastEntry.length; i++) {
            overlays[i] = lastEntry[i];
            overlays[i].setMap(map);
        }
        var conditionPrevious = presentOverlays[presentOverlays.length - 1] !== undefined ;
        
        if (conditionPrevious){
            prevOverlays.push(presentOverlays[0]);
        }
        
        presentOverlays = [];
        //console.log("last undone", undoneOverlays[undoneOverlays.length -1]);
        presentOverlays.push(undoneOverlays[undoneOverlays.length - 1]);
        undoneOverlays.pop();

    }

}

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 editable      = rect.editable;

    var clone_polyline = new google.maps.Polyline({
            geodesic: geodesic,
            strokeColor: strokeColor,
            strokeOpacity: strokeOpacity,
            strokeWeight: strokeWeight,
            path: clone_path,
            draggable: true,
            editable: false
        });

    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 editable      = rect.editable;

    var clone_polygon = new google.maps.Polygon({
            geodesic: geodesic,
            strokeColor: strokeColor,
            strokeOpacity: strokeOpacity,
            strokeWeight: strokeWeight,
            fillColor: fillColor,
            fillOpacity: fillOpacity,
            path: clone_path,
            draggable: true,
            editable: false
        });

    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 editable      = rect.editable;

    var clone_rect = new google.maps.Rectangle({
            strokeColor: strokeColor,
            strokeOpacity: strokeOpacity,
            strokeWeight: strokeWeight,
            fillColor: fillColor,
            fillOpacity: fillOpacity,
            bounds: bounds,
            draggable: true,
            editable: false
        });

    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 editable      = rect.editable;

    var clone_circ = new google.maps.Circle({
            strokeColor: strokeColor,
            strokeOpacity: strokeOpacity,
            strokeWeight: strokeWeight,
            fillColor: fillColor,
            fillOpacity: fillOpacity,
            center: center,
            radius: radius,
            draggable: true,
            editable: false
        });

    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;
    }
    console.log(cloneShape);
}

function overlayItemIsShape(overlay_item) {
    var type = overlay_item.type;

    is_shape = (type === google.maps.drawing.OverlayType.POLYLINE)
     || (type === google.maps.drawing.OverlayType.POLYGON)
     || (type === google.maps.drawing.OverlayType.RECTANGLE)
     || (type === google.maps.drawing.OverlayType.CIRCLE);

    return is_shape;
}

function historyOverlayPush() {
    undoneOverlays = [];
    var overlays_copy = [];
    for (var i = 0; i < overlays.length; i++) {
        var clone_shape = cloneShape(overlays[i]);
        if (overlayItemIsShape(clone_shape)) {
            addShapeListeners(clone_shape, null); // don't have an overlay event!
        } else {
            addMarkerListeners(clone_shape, null); // don't have an overlay event!
        }
        overlays_copy[i] = clone_shape;
    }

    prevOverlays.push(overlays_copy);

}

function presentOverlayPush() {
    if (resizeEntry) {
        prevOverlays.push(presentOverlays[0]);
    }
    presentOverlays = [];
    var overlays_copy = [];
    for (var i = 0; i < overlays.length; i++) {
        var clone_shape = cloneShape(overlays[i]);
        if (overlayItemIsShape(clone_shape)) {
            addShapeListeners(clone_shape, null); // don't have an overlay event!
        } else {
            addMarkerListeners(clone_shape, null); // don't have an overlay event!
        }
        overlays_copy[i] = clone_shape;
    }
    presentOverlays.push(overlays_copy);
}

function undoneOverlaysPush() {
    var conditionUndone = presentOverlays[presentOverlays.length - 1] !== undefined;

    if (conditionUndone) {
        undoneOverlays.push(presentOverlays[0]);
    }
    presentOverlays = [];
    var conditionPresent = prevOverlays[prevOverlays.length - 1] !== undefined;

    if (conditionPresent) {
        presentOverlays.push(prevOverlays[prevOverlays.length - 1]);

    }
    //prevOverlays.pop();

}