Data may only appear at a certain scale on a map, and may be visually lost if zooming too far in or out. Setting the minimum and maximum scales ensures the zoom extents are appropriately limited for the purposes of the map.
How to use the sample
Zoom in and out of the map. The zoom extents of the map are limited between the given minimum and maximum scales.
How it works
Create a Map object.
Set min and max scales of map with setMaxScale() and setMinScale().
Set the map to a MapView object.
Relevant API
Map
Basemap
MapView
ViewPoint
Tags
area of interest, level of detail, maximum, minimum, scale, viewpoint
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// [WriteFile Name=MinMaxScale, Category=Maps]// [Legal]// Copyright 2018 Esri.// Licensed under the Apache License, Version 2.0 (the "License");// you may not use this file except in compliance with the License.// You may obtain a copy of the License at// http://www.apache.org/licenses/LICENSE-2.0// Unless required by applicable law or agreed to in writing, software// distributed under the License is distributed on an "AS IS" BASIS,// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.// See the License for the specific language governing permissions and// limitations under the License.// [Legal]#ifdef PCH_BUILD#include"pch.hpp"#endif// PCH_BUILD#include"MinMaxScale.h"#include"Map.h"#include"MapQuickView.h"#include"MapTypes.h"#include"TaskWatcher.h"#include"SpatialReference.h"#include"Point.h"usingnamespace Esri::ArcGISRuntime;
MinMaxScale::MinMaxScale(QQuickItem* parent /* = nullptr */):
QQuickItem(parent)
{
}
voidMinMaxScale::init(){
// Register the map view for QML qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
qmlRegisterType<MinMaxScale>("Esri.Samples", 1, 0, "MinMaxScaleSample");
}
voidMinMaxScale::componentComplete(){
QQuickItem::componentComplete();
// find QML MapView component m_mapView = findChild<MapQuickView*>("mapView");
// Create a map using the streets basemap m_map = newMap(BasemapStyle::ArcGISStreets, this);
// Establish the minimum and maximum scales for the map m_map->setMaxScale(2000);
m_map->setMinScale(8000);
// Set map to map view m_mapView->setMap(m_map);
Point edinburgh(-3.1927,55.9515, SpatialReference(4326));
m_mapView->setViewpointCenter(edinburgh);
}