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Merge pull request #244 from Esri/project
project (geometry) sample
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‎src/main/java/com/esri/samples/geometry/project/Project.png‎

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‎src/main/java/com/esri/samples/geometry/project/ProjectSample.java‎

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/*
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* Copyright 2018 Esri.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may not
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* use this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations under
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* the License.
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*/
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package com.esri.samples.geometry.project;
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import java.text.DecimalFormat;
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import javafx.application.Application;
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import javafx.geometry.Point2D;
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import javafx.scene.Scene;
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import javafx.scene.input.MouseButton;
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import javafx.scene.layout.StackPane;
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import javafx.stage.Stage;
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import com.esri.arcgisruntime.geometry.Envelope;
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import com.esri.arcgisruntime.geometry.Geometry;
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import com.esri.arcgisruntime.geometry.GeometryEngine;
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import com.esri.arcgisruntime.geometry.Point;
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import com.esri.arcgisruntime.geometry.SpatialReferences;
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import com.esri.arcgisruntime.mapping.ArcGISMap;
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import com.esri.arcgisruntime.mapping.Basemap;
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import com.esri.arcgisruntime.mapping.view.Callout;
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import com.esri.arcgisruntime.mapping.view.Graphic;
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import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
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import com.esri.arcgisruntime.mapping.view.MapView;
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import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
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public class ProjectSample extends Application {
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private MapView mapView;
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@Override
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public void start(Stage stage) {
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try {
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// create stack pane and application scene
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StackPane stackPane = new StackPane();
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Scene scene = new Scene(stackPane);
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// set title, size, and add scene to stage
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stage.setTitle("Project Sample");
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stage.setWidth(800);
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stage.setHeight(700);
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stage.setScene(scene);
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stage.show();
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// create a map with a web mercator basemap
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ArcGISMap map = new ArcGISMap(SpatialReferences.getWebMercator());
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map.setBasemap(Basemap.createNationalGeographic());
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mapView = new MapView();
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mapView.setMap(map);
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// zoom to Minneapolis
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Geometry startingEnvelope = new Envelope(-10995912.335747, 5267868.874421, -9880363.974046, 5960699.183877,
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SpatialReferences.getWebMercator());
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mapView.setViewpointGeometryAsync(startingEnvelope);
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// create a graphics to show the input location
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GraphicsOverlay graphicsOverlay = new GraphicsOverlay();
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mapView.getGraphicsOverlays().add(graphicsOverlay);
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// create a red marker symbol for the input point
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final SimpleMarkerSymbol markerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, 0xFFFF0000, 5);
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Graphic inputPointGraphic = new Graphic();
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inputPointGraphic.setSymbol(markerSymbol);
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graphicsOverlay.getGraphics().add(inputPointGraphic);
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DecimalFormat decimalFormat = new DecimalFormat("#.00000");
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// show the input location where the user clicks on the map
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mapView.setOnMouseClicked(e -> {
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if (e.isStillSincePress() && e.getButton() == MouseButton.PRIMARY) {
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Point2D point2D = new Point2D(e.getX(), e.getY());
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// show the clicked location on the map with a graphic
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Point originalPoint = mapView.screenToLocation(point2D);
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inputPointGraphic.setGeometry(originalPoint);
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// project the web mercator point to WGS84
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Point projectedPoint = (Point) GeometryEngine.project(originalPoint, SpatialReferences.getWgs84());
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// show the original and projected point coordinates in a callout from the graphic
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Callout callout = mapView.getCallout();
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callout.setTitle("Projection");
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String ox = decimalFormat.format(originalPoint.getX());
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String oy = decimalFormat.format(originalPoint.getY());
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String px = decimalFormat.format(projectedPoint.getX());
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String py = decimalFormat.format(projectedPoint.getY());
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callout.setDetail("Original: " + ox + ", " + oy + "\n" + "Projected: " + px + ", " + py);
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callout.showCalloutAt(inputPointGraphic, originalPoint);
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}
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});
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// add the map view to the stack pane
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stackPane.getChildren().add(mapView);
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} catch (Exception e) {
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// on any error, display the stack trace.
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e.printStackTrace();
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}
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}
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/**
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* Stops and releases all resources used in application.
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*/
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@Override
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public void stop() {
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if (mapView != null) {
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mapView.dispose();
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}
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}
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/**
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* Opens and runs application.
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*
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* @param args arguments passed to this application
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*/
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public static void main(String[] args) {
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Application.launch(args);
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}
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}

‎src/main/java/com/esri/samples/geometry/project/README.md‎

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<h1>Project</h1>
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<p>This sample demonstrates how to project a point from one spatial reference to another.</p>
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<p>Being able to project between spatial references is fundamental to a GIS. An example of when you would need to
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re-project data is if you had data in two different spatial references, but wanted to perform an intersect analysis
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with the <code>GeometryEngine::intersect</code> function. This function takes two geometries as parameters, and both
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geometries must be in the same spatial reference. If they are not, you could first use
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<code>GeometryEngine::project</code> to convert the geometries so they match.</p>
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<p><img src="Project.png"></p>
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<h2>How to use the sample</h2>
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<p>Click anywhere on the map. A callout will display the clicked location's coordinate in the original (basemap's)
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spatial reference and in the projected spatial reference.</p>
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<h2>How it works</h2>
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<p>To project a geometry to another spatial reference:</p>
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<ol>
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<li>Call the static method, <code>GeometryEngine.project</code>, passing in the original <code>Geometry</code> and a
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<code>SpatialReference</code> to project to.</li>
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</ol>
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<h2>Features</h2>
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<ul>
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<li>GeometryEngine</li>
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<li>Point</li>
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<li>SpatialReference</li>
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</ul>

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