Animate images with image overlay

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Animate a series of images with an image overlay.

screenshot

Use case

An image overlay is useful for displaying fast and dynamic images; for example, rendering real-time sensor data captured from a drone. Each frame from the drone becomes a static image which is updated on the fly as the data is made available.

How to use the sample

The application loads a map of the Southwestern United States. Click the "Start" or "Stop" buttons to start or stop the radar animation. Use the drop down menu to select how quickly the animation plays. Move the slider to change the opacity of the image overlay.

How it works

  1. Create an ImageOverlay and add it to the SceneView.
  2. Set up a timer with an initial interval time of 68ms, which will display approximately 15 ImageFrames per second.
  3. Connect to the timeout signal from the timer.
  4. Create a new image frame every timeout and set it on the image overlay.

Relevant API

  • ImageFrame
  • ImageOverlay
  • SceneView

Offline data

Link Local Location
Pacific South West Images <userhome>/ArcGIS/Runtime/Data/3D/ImageOverlay/PacificSouthWest.zip

About the data

These radar images were captured by the US National Weather Service (NWS). They highlight the Pacific Southwest sector which is made up of part the western United States and Mexico. For more information visit the National Weather Service website.

Additional information

The supported image formats are GeoTIFF, TIFF, JPEG, and PNG. ImageOverlay does not support the rich processing and rendering capabilities of a RasterLayer. Use Raster and RasterLayer for static image rendering, analysis, and persistence.

Tags

3d, animation, drone, dynamic, image frame, image overlay, real time, rendering

Sample Code

AnimateImagesWithImageOverlay.qmlAnimateImagesWithImageOverlay.cppAnimateImagesWithImageOverlay.h
                                                                                                                              
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// [WriteFile Name=AnimateImagesWithImageOverlay, Category=Scenes]
// [Legal]
// Copyright 2020 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 QtQuick.Layouts 1.12
import Esri.Samples 1.0

Item {
    property var timerIntervals: [17,34,68]
    property var imageFrameRefreshRate: ["Fast","Medium","Slow"]

    SceneView {
        id: view
        anchors.fill: parent

        Rectangle {
            id: controlsRect
            anchors {
                bottom: view.attributionTop
                horizontalCenter: parent.horizontalCenter
            }
            width: childrenRect.width
            height: childrenRect.height
            color: "lightgrey"
            opacity: 0.8
            radius: 5
            ColumnLayout {
                id: controlsLayout
                Layout.alignment: Qt.AlignBottom
                spacing: 0

                Slider {
                    id: opacitySlider
                    from: 0
                    to: 1
                    value: 1
                    Layout.preferredHeight: bottomRowControls.height
                    Layout.alignment: Qt.AlignHCenter

                    onMoved: model.setOpacity(value);

                    // Custom slider handle that displays the current value
                    handle: Item {
                        x: parent.leftPadding + parent.visualPosition * (parent.availableWidth - headingHandleNub.width)
                        y: parent.topPadding + parent.availableHeight / 2 - headingHandleNub.height / 2

                        Rectangle {
                            id: headingHandleNub
                            color: headingHandleRect.color
                            radius: width * 0.5
                            width: 20
                            height: width
                        }
                        Rectangle {
                            id: headingHandleRect
                            height: childrenRect.height
                            width: childrenRect.width
                            radius: 3
                            x: headingHandleNub.x - width / 2 + headingHandleNub.width / 2
                            y: headingHandleNub.y - height
                            color: opacitySlider.background.children[0].color

                            Text {
                                id: headingValue
                                font.pixelSize: 14
                                padding: 3
                                horizontalAlignment: Qt.AlignHCenter
                                verticalAlignment: Qt.AlignVCenter
                                text: "opacity: " + (opacitySlider.value).toFixed(2)
                                color: "white"
                            }
                        }
                    }
                }

                RowLayout {
                    id: bottomRowControls
                    spacing: 2
                    Button {
                        id: startStopBtn
                        text: model.isStopped ? qsTr("Start") : qsTr("Stop")
                        Layout.minimumWidth: timerIntervalComboBox.width
                        onClicked: {
                            if (model.isStopped) {
                                model.startTimer();
                            } else {
                                model.stopTimer();
                            }
                        }
                    }

                    ComboBox {
                        id: timerIntervalComboBox
                        currentIndex: 2
                        model: imageFrameRefreshRate
                        Layout.minimumWidth: startStopBtn.width

                        onActivated: {
                            model.setTimerInterval(timerIntervals[currentIndex]);
                        }
                    }
                }
            }
        }
    }

    // Declare the C++ instance which creates the scene etc. and supply the view
    AnimateImagesWithImageOverlaySample {
        id: model
        sceneView: view
    }
}

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