Feature layer extrusion

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// [WriteFile Name=FeatureLayerExtrusion, Category=Scenes]
// [Legal]
// Copyright 2017 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
import QtQuick.Controls
import Esri.ArcGISRuntime

Rectangle {
    id: rootRectangle
    clip: true
    width: 800
    height: 600

    SceneView {
        id: sceneView
        anchors.fill: parent

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

        Scene {
            id: scene
            Basemap {
                initStyle: Enums.BasemapStyleArcGISImageryStandard
            }

            ServiceFeatureTable {
                id: featureTable
                url: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3"
            }

            FeatureLayer {
                id: featureLayer
                featureTable: featureTable
                renderingMode: Enums.FeatureRenderingModeDynamic
                renderer: renderer
            }

            Surface {
                id: baseSurface
                ArcGISTiledElevationSource {
                    url: "https://elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
                }
            }

            ViewpointCenter {
                Point {
                    id: lookAtPoint
                    x: -99.659448
                    y: 20.513652
                    z: 12940924
                    spatialReference: SpatialReference { wkid: 4326 }
                }
                targetScale: 12940924

                Camera {
                    id: initialCamera
                    location: lookAtPoint
                    roll: 0
                    pitch: 15
                    heading: 0
                }
            }
        }

        // combo box to update the extrusion
        ComboBox {
            id: popCombo
            anchors {
                top: parent.top
                left: parent.left
                margins: 10
            }

            // Add a background to the ComboBox
            Rectangle {
                anchors.fill: parent
                radius: 10
                // Make the rectangle visible if a dropdown indicator exists
                // An indicator only exists if a theme is set
                visible: parent.indicator
                border.width: 1
            }

            property int modelWidth: 0
            width: modelWidth + leftPadding + rightPadding + (indicator ? indicator.width : 10)
            model: ["TOTAL POPULATION", "POPULATION DENSITY"]

            onCurrentTextChanged: {
                if (currentText === "TOTAL POPULATION")
                    sceneProperties.extrusionExpression = "[POP2007] / 10";
                else
                    sceneProperties.extrusionExpression = "([POP07_SQMI] * 5000) + 100000";
            }

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

        SimpleRenderer {
            id: renderer
            symbol: fillSymbol
            sceneProperties: sceneProperties
        }

        RendererSceneProperties {
            id: sceneProperties
            extrusionMode: Enums.ExtrusionModeAbsoluteHeight
            extrusionExpression: "[POP2007] / 10"
        }

        SimpleFillSymbol {
            id: fillSymbol
            color: "blue"
            outline: lineSymbol
        }

        SimpleLineSymbol {
            id: lineSymbol
            color: "black"
        }
    }
}