Style graphics with renderer

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// Copyright 2022 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
//
//   https://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.

import SwiftUI
import ArcGIS

struct StyleGraphicsWithRendererView: View {
    /// The view model for the sample.
    @StateObject private var model = Model()

    var body: some View {
        MapView(map: model.map, graphicsOverlays: model.graphicsOverlays)
    }
}

private extension StyleGraphicsWithRendererView {
    /// The model used to store the geo model and other expensive objects
    /// used in this view.
    class Model: ObservableObject {
        /// A map with a topographic basemap style and an initial viewpoint.
        let map: Map = {
            let map = Map(basemapStyle: .arcGISTopographic)
            map.initialViewpoint = Viewpoint(center: Point(x: 20e5, y: 20e5, spatialReference: .webMercator), scale: 7e7)
            return map
        }()

        /// The graphics overlays used in this sample.
        var graphicsOverlays: [GraphicsOverlay] {
            return [
                pointGraphicsOverlay,
                lineGraphicsOverlay,
                squarePolygonGraphicsOverlay,
                ellipseGraphicsOverlay,
                curvedPolygonGraphicsOverlay
            ]
        }

        /// The graphics overlay rendering a point.
        private let pointGraphicsOverlay: GraphicsOverlay = {
            // Creates a simple marker symbol.
            let symbol = SimpleMarkerSymbol(style: .diamond, color: .green, size: 10)
            // Creates the geometry for the point.
            let geometry = Point(x: 40e5, y: 40e5, spatialReference: .webMercator)

            // Creates a graphics overlay containing a graphic with the point geometry.
            let overlay = GraphicsOverlay(graphics: [Graphic(geometry: geometry)])
            // Creates and assigns a simple renderer to the graphics overlay.
            overlay.renderer = SimpleRenderer(symbol: symbol)
            return overlay
        }()

        /// The graphics overlay rendering a line.
        private let lineGraphicsOverlay: GraphicsOverlay = {
            // Creates a simple line symbol.
            let symbol = SimpleLineSymbol(style: .solid, color: .blue, width: 5)
            // Creates the geometry for the line.
            let geometry = Polyline(
                points: [
                    Point(x: -10e5, y: 40e5),
                    Point(x: 20e5, y: 50e5)
                ],
                spatialReference: .webMercator
            )

            // Creates a graphics overlay containing a graphic with the line geometry.
            let overlay = GraphicsOverlay(graphics: [Graphic(geometry: geometry)])
            // Creates and assigns a simple renderer to the graphics overlay.
            overlay.renderer = SimpleRenderer(symbol: symbol)
            return overlay
        }()

        /// The graphics overlay rendering a square polygon.
        private let squarePolygonGraphicsOverlay: GraphicsOverlay = {
            // Creates a simple fill symbol.
            let symbol = SimpleFillSymbol(color: .yellow)
            // Creates the geometry for the square polygon.
            let geometry = Polygon(
                points: [
                    Point(x: -20e5, y: 20e5),
                    Point(x: 20e5, y: 20e5),
                    Point(x: 20e5, y: -20e5),
                    Point(x: -20e5, y: -20e5)
                ],
                spatialReference: .webMercator
            )

            // Creates a graphics overlay containing a graphic with the square geometry.
            let overlay = GraphicsOverlay(graphics: [Graphic(geometry: geometry)])
            // Creates and assigns a simple renderer to the graphics overlay.
            overlay.renderer = SimpleRenderer(symbol: symbol)
            return overlay
        }()

        /// The graphics overlay rendering an ellipse.
        private let ellipseGraphicsOverlay: GraphicsOverlay = {
            // Creates a simple fill symbol.
            let symbol = SimpleFillSymbol(color: .purple)
            // Defines the center point of the ellipse.
            let center = Point(x: 40e5, y: 25e5, spatialReference: .webMercator)
            // Creates the parameters for the ellipse.
            let parameters = GeodesicEllipseParameters<ArcGIS.Polygon>(
                axisDirection: -45,
                center: center,
                linearUnit: .kilometers,
                maxPointCount: 100,
                maxSegmentLength: 20,
                semiAxis1Length: 200,
                semiAxis2Length: 400
            )
            // Creates the geometry for the ellipse from the parameters.
            let geometry = GeometryEngine.geodesicEllipse(parameters: parameters)

            // Creates a graphics overlay containing a graphic with the ellipse geometry.
            let overlay = GraphicsOverlay(graphics: [Graphic(geometry: geometry)])
            // Creates and assigns a simple renderer to the graphics overlay.
            overlay.renderer = SimpleRenderer(symbol: symbol)
            return overlay
        }()

        /// The graphics overlay rendering a curved polygon.
        private let curvedPolygonGraphicsOverlay: GraphicsOverlay = {
            // Creates a simple fill symbol with an outline.
            let lineSymbol = SimpleLineSymbol(style: .solid, color: .black, width: 1)
            let fillSymbol = SimpleFillSymbol(color: .red, outline: lineSymbol)
            // Defines the point of origin for the curved polygon.
            let origin = Point(x: 40e5, y: 5e5, spatialReference: .webMercator)
            // Creates a heart-shaped polygon.
            let heartPolygon = makeHeartPolygon(center: origin, sideLength: 10e5)

            // Creates a graphics overlay containing a graphic with the polygon geometry.
            let overlay = GraphicsOverlay(graphics: [Graphic(geometry: heartPolygon)])
            // Creates and assigns a simple renderer to the graphics overlay.
            overlay.renderer = SimpleRenderer(symbol: fillSymbol)
            return overlay
        }()

        /// Creates a heart-shaped polygon with Bezier and elliptic arc segments.
        /// - Parameters:
        ///   - center: The center of the square that contains the heart shape.
        ///   - sideLength: The side length of the square.
        /// - Returns: A heart-shaped polygon.
        private static func makeHeartPolygon(center: Point, sideLength: Double) -> ArcGIS.Polygon? {
            guard sideLength > 0 else { return nil }
            let spatialReference = center.spatialReference
            // Defines the x and y coordinates to simplify the calculation.
            let minX = center.x - sideLength * 0.5
            let minY = center.y - sideLength * 0.5
            // Defines the radius of the arcs.
            let arcRadius = sideLength * 0.25

            // Creates the bottom left curve segment.
            let leftCurveStart = Point(x: center.x, y: minY, spatialReference: spatialReference)
            let leftCurveEnd = Point(x: minX, y: minY + sideLength * 0.75, spatialReference: spatialReference)
            let leftControlPoint1 = Point(x: center.x, y: minY + sideLength * 0.25, spatialReference: spatialReference)
            let leftControlPoint2 = Point(x: minX, y: center.y, spatialReference: spatialReference)
            let leftCurve = CubicBezierSegment(
                startPoint: leftCurveStart,
                controlPoint1: leftControlPoint1,
                controlPoint2: leftControlPoint2,
                endPoint: leftCurveEnd,
                spatialReference: spatialReference
            )

            // Creates the top left arc segment.
            let leftArcCenter = Point(x: minX + sideLength * 0.25, y: minY + sideLength * 0.75, spatialReference: spatialReference)
            let leftArc = EllipticArcSegment.makeCircular(
                centerPoint: leftArcCenter,
                radius: arcRadius,
                startAngle: .pi,
                centralAngle: -.pi,
                spatialReference: spatialReference
            )

            // Creates the top right arc segment.
            let rightArcCenter = Point(x: minX + sideLength * 0.75, y: minY + sideLength * 0.75, spatialReference: spatialReference)
            let rightArc = EllipticArcSegment.makeCircular(
                centerPoint: rightArcCenter,
                radius: arcRadius,
                startAngle: .pi,
                centralAngle: -.pi,
                spatialReference: spatialReference
            )

            // Creates the bottom right curve segment.
            let rightCurveStart = Point(x: minX + sideLength, y: minY + sideLength * 0.75, spatialReference: spatialReference)
            let rightCurveEnd = leftCurveStart
            let rightControlPoint1 = Point(x: minX + sideLength, y: center.y, spatialReference: spatialReference)
            let rightControlPoint2 = leftControlPoint1
            let rightCurve = CubicBezierSegment(
                startPoint: rightCurveStart,
                controlPoint1: rightControlPoint1,
                controlPoint2: rightControlPoint2,
                endPoint: rightCurveEnd,
                spatialReference: spatialReference
            )

            // Creates and returns the heart polygon.
            return Polygon(parts: [MutablePart(segments: [leftCurve, leftArc, rightArc, rightCurve], spatialReference: spatialReference)])
        }
    }
}

#Preview {
    StyleGraphicsWithRendererView()
}