Change viewpoint

View inC++QMLView on GitHubSample viewer app

Set the map view to a new viewpoint.

screenshot

Use case

Programmatically navigate to a specified location in the map or scene. Use this to focus on a particular point or area of interest.

How to use the sample

The map view has several methods for setting its current viewpoint. Select a viewpoint from the UI to see the viewpoint changed using that method.

How it works

  1. Create a Map object and set it to the MapView object.
  2. Change the map's Viewpoint using one of the available methods:
  • Use MapView.setViewpointWithAnimationCurve(viewPoint, duration, Enums.AnimationCurve) to pan to a viewpoint over the specified length of time.
  • Use MapView.setViewpointCenter() to center the viewpoint on a Point and set a distance from the ground using a scale.
  • Use MapView.setViewpointGeometry() to set the viewpoint to a given Geometry.

Relevant API

  • Enums.AnimationCurve
  • Map
  • Geometry
  • MapView
  • Point
  • Viewpoint

Additional information

Below are some other ways to set a viewpoint:

  • setViewpoint
  • setViewpointCenter
  • setViewpointGeometry
  • setViewpointRotation
  • setViewpointScale

Tags

animate, extent, pan, rotate, scale, view, zoom

Sample Code

ChangeViewpoint.qml
Use dark colors for code blocksCopy
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
// [WriteFile Name=ChangeViewpoint, Category=Maps]
// [Legal]
// Copyright 2016 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]

import QtQuick 2.6
import QtQuick.Controls 2.2
import Esri.ArcGISRuntime 100.15

Rectangle {
    width: 800
    height: 600

    property real   rotationValue: 0.0
    property int    scaleIndex: -1

    PointBuilder {
        id: ptBuilder
        spatialReference: SpatialReference { wkid: 4326 }
    }

    EnvelopeBuilder {
        id: envBuilder
        spatialReference: SpatialReference { wkid: 4326 }
    }

    ViewpointExtent {
        id: springViewpoint
        extent: Envelope {
            xMin: -12338668.348591767
            xMax: -12338247.594362013
            yMin: 5546908.424239618
            yMax: 5547223.989911933
            spatialReference: SpatialReference { wkid: 102100 }
        }
    }

    MapView {
        id: mv
        anchors.fill: parent

        Component.onCompleted: {
            // Set the focus on MapView to initially enable keyboard navigation
            forceActiveFocus();
        }

        Map {
            Basemap {
                initStyle: Enums.BasemapStyleArcGISImagery
            }
        }
    }

    ComboBox {
        id: comboBoxViewpoint
        anchors {
            left: parent.left
            top: parent.top
            margins: 5
        }

        property int modelWidth: 0
        width: modelWidth + leftPadding + rightPadding + indicator.width

        model: ["Center","Center and scale","Geometry","Geometry and padding","Rotation","Scale 1:5,000,000","Scale 1:10,000,000","Animation"]
        onCurrentTextChanged: {
            changeCurrentViewpoint(currentText);
        }

        Component.onCompleted: {
            for (let i = 0; i < model.length; ++i) {
                metrics.text = model[i];
                modelWidth = Math.max(modelWidth, metrics.width)
            }
        }

        TextMetrics {
            id: metrics
            font: comboBoxViewpoint.font
        }

        function changeCurrentViewpoint(text) {
            switch (text) {
            case "Center":
                ptBuilder.setXY(-117.195681, 34.056218); // Esri Headquarters
                mv.setViewpointCenter(ptBuilder.geometry);
                break;
            case "Center and scale":
                ptBuilder.setXY(-157.564, 20.677); // Hawai'i
                mv.setViewpointCenterAndScale(ptBuilder.geometry, 4000000.0);
                break;
            case "Geometry":
                envBuilder.setXY(116.380, 39.920, 116.400, 39.940); // Beijing
                mv.setViewpointGeometry(envBuilder.geometry);
                break;
            case "Geometry and padding":
                envBuilder.setXY(116.380, 39.920, 116.400, 39.940); // Beijing
                mv.setViewpointGeometryAndPadding(envBuilder.geometry, 200 * screenRatio());
                break;
            case "Rotation":
                rotationValue = (rotationValue + 45.0) % 360.0;
                mv.setViewpointRotation(rotationValue);
                break;
            case "Scale 1:5,000,000":
                mv.setViewpointScale(5000000.0);
                break;
            case "Scale 1:10,000,000":
                mv.setViewpointScale(10000000.0);
                break;
            case "Animation":
                mv.setViewpointWithAnimationCurve(springViewpoint, 4.0, Enums.AnimationCurveEaseInOutCubic);
                break;
            }
        }
    }

    function screenRatio() {
        const width = mv.mapWidth;
        const height = mv.mapHeight;
        return height > width ? width / height : height / width;
    }
}

Your browser is no longer supported. Please upgrade your browser for the best experience. See our browser deprecation post for more details.