Javascript 在google api中为绘制多边形设置缩放选项

如何将规则设置为drawingManager，该用户可以在特定缩放后绘制多边形。 例如，用户必须达到缩放18，然后DrawingManager允许绘制多边形

function DrawingTools() {
    myDrawingManager = new google.maps.drawing.DrawingManager({
        drawingMode: null,
        drawingControl: true,
        drawingControlOptions: {
            position: google.maps.ControlPosition.RIGHT_TOP,
            drawingModes: [
                google.maps.drawing.OverlayType.POLYGON,
            ]
        },
        polygonOptions: {
            draggable: true,
            editable: true,
            fillColor: '#cccccc',
            fillOpacity: 0.5,
            strokeColor: '#000000'
        }
    });

    myDrawingManager.setMap(map);
}

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感谢您为地图缩放级别更改提供事件侦听器

google.maps.event.addListener(map, 'zoom_changed', function() {
    if (map.getZoom() >= 18) {
        DrawingTools();
    }
});

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谢谢，这就是我想要的。