Add graphics with renderer

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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
// 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: 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.

using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;

using Color = System.Drawing.Color;

namespace ArcGIS.Samples.AddGraphicsRenderer
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Add graphics with renderer",
        category: "GraphicsOverlay",
        description: "A renderer allows you to change the style of all graphics in a graphics overlay by referencing a single symbol style. A renderer will only affect graphics that do not specify their own symbol style.",
        instructions: "Pan and zoom on the map to view graphics for points, lines, and polygons (including polygons with curve segments) which are stylized using renderers.",
        tags: new[] { "arc", "bezier", "curve", "display", "ellipse", "graphics", "marker", "overlay", "renderer", "segment", "symbol", "true curve" })]
    public partial class AddGraphicsRenderer : ContentPage
    {
        public AddGraphicsRenderer()
        {
            InitializeComponent();
            Initialize();
        }

        private void Initialize()
        {
            // Create a map for the map view.
            MyMapView.Map = new Map(BasemapStyle.ArcGISTopographic);

            // Add graphics overlays to the map view.
            MyMapView.GraphicsOverlays.AddRange(new[]
            {
                MakePointGraphicsOverlay(),
                MakeLineGraphicsOverlay(),
                MakeSquareGraphicsOverlay(),
                MakeCurvedGraphicsOverlay(),
                MakeEllipseGraphicsOverlay()
            });
        }

        private GraphicsOverlay MakeEllipseGraphicsOverlay()
        {
            // Create a simple fill symbol with outline.
            SimpleLineSymbol curvedLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Purple, 1);
            SimpleFillSymbol curvedFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Purple, curvedLineSymbol);

            // Create a graphics overlay for the polygons with curve segments.
            GraphicsOverlay ellipseGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            ellipseGraphicsOverlay.Renderer = new SimpleRenderer(curvedFillSymbol);

            // Create the polygon geometry, then create a graphic using that polygon.
            Polygon ellipse = MakeEllipseGeometry();
            Graphic ellipseGraphic = new Graphic(ellipse);

            // Add the graphic to the graphics overlay.
            ellipseGraphicsOverlay.Graphics.Add(ellipseGraphic);

            return ellipseGraphicsOverlay;
        }

        private GraphicsOverlay MakePointGraphicsOverlay()
        {
            // Create a simple marker symbol.
            SimpleMarkerSymbol pointSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Diamond, Color.Green, 10);

            // Create a graphics overlay for the points.
            GraphicsOverlay pointGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            pointGraphicsOverlay.Renderer = new SimpleRenderer(pointSymbol);

            // Create a graphic with the map point geometry.
            MapPoint pointGeometry = new MapPoint(x: 40e5, y: 40e5, SpatialReferences.WebMercator);
            Graphic pointGraphic = new Graphic(pointGeometry);

            // Add the graphic to the overlay.
            pointGraphicsOverlay.Graphics.Add(pointGraphic);
            return pointGraphicsOverlay;
        }

        private GraphicsOverlay MakeLineGraphicsOverlay()
        {
            // Create a simple line symbol.
            SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Blue, 5);

            // Create a graphics overlay for the polylines.
            GraphicsOverlay lineGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            lineGraphicsOverlay.Renderer = new SimpleRenderer(lineSymbol);

            // Create a line graphic with new Polyline geometry.
            PolylineBuilder lineBuilder = new PolylineBuilder(SpatialReferences.WebMercator);
            lineBuilder.AddPoint(x: -10e5, y: 40e5);
            lineBuilder.AddPoint(x: 20e5, y: 50e5);
            Graphic lineGraphic = new Graphic(lineBuilder.ToGeometry());

            // Add the graphic to the overlay.
            lineGraphicsOverlay.Graphics.Add(lineGraphic);
            return lineGraphicsOverlay;
        }

        private GraphicsOverlay MakeSquareGraphicsOverlay()
        {
            // Create a simple fill symbol.
            SimpleFillSymbol squareSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Yellow, null);

            // Create a graphics overlay for the square polygons.
            GraphicsOverlay squareGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            squareGraphicsOverlay.Renderer = new SimpleRenderer(squareSymbol);

            // Create a polygon graphic with `new Polygon` geometry.
            PolygonBuilder polygonBuilder = new PolygonBuilder(SpatialReferences.WebMercator);
            polygonBuilder.AddPoint(x: -20e5, y: 20e5);
            polygonBuilder.AddPoint(x: 20e5, y: 20e5);
            polygonBuilder.AddPoint(x: 20e5, y: -20e5);
            polygonBuilder.AddPoint(x: -20e5, y: -20e5);
            Graphic polygonGraphic = new Graphic(polygonBuilder.ToGeometry());

            // Add the graphic to the overlay.
            squareGraphicsOverlay.Graphics.Add(polygonGraphic);
            return squareGraphicsOverlay;
        }

        private GraphicsOverlay MakeCurvedGraphicsOverlay()
        {
            // Create a simple fill symbol with outline.
            SimpleLineSymbol curvedLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Black, 1);
            SimpleFillSymbol curvedFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Red, curvedLineSymbol);

            // Create a graphics overlay for the polygons with curve segments.
            GraphicsOverlay curvedGraphicsOverlay = new GraphicsOverlay();

            // Create and assign a simple renderer to the graphics overlay.
            curvedGraphicsOverlay.Renderer = new SimpleRenderer(curvedFillSymbol);

            // Create a heart-shaped graphic.
            MapPoint origin = new MapPoint(x: 40e5, y: 5e5, SpatialReferences.WebMercator);
            Geometry heartGeometry = MakeHeartGeometry(origin, 10e5);
            Graphic heartGraphic = new Graphic(heartGeometry);
            curvedGraphicsOverlay.Graphics.Add(heartGraphic);
            return curvedGraphicsOverlay;
        }

        private Geometry MakeHeartGeometry(MapPoint center, double sideLength)
        {
            if (sideLength <= 0) return null;

            SpatialReference spatialReference = center.SpatialReference;

            // The x and y coordinates to simplify the calculation.
            double minX = center.X - 0.5 * sideLength;
            double minY = center.Y - 0.5 * sideLength;

            // The radius of the arcs.
            double arcRadius = sideLength * 0.25;

            // Bottom left curve.
            MapPoint leftCurveStart = new MapPoint(center.X, minY, spatialReference);
            MapPoint leftCurveEnd = new MapPoint(minX, minY + 0.75 * sideLength, spatialReference);
            MapPoint leftControlMapPoint1 = new MapPoint(center.X, minY + 0.25 * sideLength, spatialReference);
            MapPoint leftControlMapPoint2 = new MapPoint(minX, center.Y, spatialReference: spatialReference);
            CubicBezierSegment leftCurve = new CubicBezierSegment(leftCurveStart, leftControlMapPoint1, leftControlMapPoint2, leftCurveEnd, spatialReference);

            // Top left arc.
            MapPoint leftArcCenter = new MapPoint(minX + 0.25 * sideLength, minY + 0.75 * sideLength, spatialReference);
            EllipticArcSegment leftArc = EllipticArcSegment.CreateCircularEllipticArc(leftArcCenter, arcRadius, Math.PI, centralAngle: -Math.PI, spatialReference);

            // Top right arc.
            MapPoint rightArcCenter = new MapPoint(minX + 0.75 * sideLength, minY + 0.75 * sideLength, spatialReference);
            EllipticArcSegment rightArc = EllipticArcSegment.CreateCircularEllipticArc(rightArcCenter, arcRadius, Math.PI, centralAngle: -Math.PI, spatialReference);

            // Bottom right curve.
            MapPoint rightCurveStart = new MapPoint(minX + sideLength, minY + 0.75 * sideLength, spatialReference);
            MapPoint rightCurveEnd = leftCurveStart;
            MapPoint rightControlMapPoint1 = new MapPoint(minX + sideLength, center.Y, spatialReference);
            MapPoint rightControlMapPoint2 = leftControlMapPoint1;
            CubicBezierSegment rightCurve = new CubicBezierSegment(rightCurveStart, rightControlMapPoint1, rightControlMapPoint2, rightCurveEnd, spatialReference);

            // Create the heart polygon.
            Part newPart = new Part(new Segment[]
            {
                leftCurve,
                leftArc,
                rightArc,
                rightCurve
            }, spatialReference);
            PolygonBuilder builder = new PolygonBuilder(spatialReference);
            builder.AddPart(newPart);
            return builder.ToGeometry();
        }

        private Polygon MakeEllipseGeometry()
        {
            // Creates a GeodesicEllipseParameters object to use for GeometryEngine.EllipseGeodesic method.
            GeodesicEllipseParameters parameters = new GeodesicEllipseParameters
            {
                Center = new MapPoint(70e5, 10e5, SpatialReferences.WebMercator),
                GeometryType = GeometryType.Polygon,
                SemiAxis1Length = 1000,
                SemiAxis2Length = 2000,
                AxisDirection = 45,
                MaxPointCount = 100,
                // Angular unit is degrees by default.
                AngularUnit = AngularUnits.Degrees,
                // Linear unit is meters by default.
                LinearUnit = LinearUnits.Kilometers,
                MaxSegmentLength = 20
            };

            Polygon ellipsePoly = (Polygon)GeometryEngine.EllipseGeodesic(parameters);
            return ellipsePoly;
        }
    }
}