Create a line with the movable end

VanyaIvanov

I want to create a line with movable length. With one end is fixed and with the other end that could be dragged by mouse(increasing or decreasing the line length by dragging one end of the line by the mouse). Is it possible?

PointCollection polylinePoints = new PointCollection(SpatialReferences.getWgs84());
        polylinePoints.add(new Point(0, 0));
        polylinePoints.add(new Point(10, 10));//this point should be able to be dragged by mouse along the line
        Polyline polyline = new Polyline(polylinePoints);
        SimpleLineSymbol polylineSymbol =
new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF0063FF, 3);
         Line = new Graphic(polyline, polylineSymbol);
         graphicsOverlay.getGraphics().add(Line);

 

ColinAnderson1

Here's a basic example - the line extends from lat/lon 0.0, 0.0 across the surface of the globe to where ever the mouse is. To do this properly you should create your own interaction listener on the scene view as that way you can add mouse interactions with less chance of breaking the existing built in interactions. Also there's no error checking and there are probably optimizations possible such as not having to create a new graphic/clear old graphics each move.

If you only want to change the length of the line on a fixed azimuth then you'll need to do a little more code e.g. decide how the mouse point is interpreted to give your new length.

 

 

 

import java.util.List;

import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.PointCollection;
import com.esri.arcgisruntime.geometry.Polyline;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.Basemap;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.SceneView;
import com.esri.arcgisruntime.symbology.ColorUtil;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.geometry.Point2D;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class App extends Application {

  private SceneView sceneView = new SceneView();
    
  @Override
  public void start(Stage stage) {
    Platform.setImplicitExit(true);

    var borderPane = new BorderPane();

    var scene = new Scene(borderPane);
    stage.setScene(scene);
    stage.setWidth(500);
    stage.setHeight(500);
    stage.show();

    var map = new ArcGISScene(Basemap.createDarkGrayCanvasVector());

    sceneView.setArcGISScene(map);
    borderPane.setCenter(sceneView);

    var graphicsOverlay = new GraphicsOverlay();
    sceneView.getGraphicsOverlays().add(graphicsOverlay);

    // add a mouse move listener
    sceneView.setOnMouseMoved(m -> {
      // convert the mouse point to screen coords
      var point = sceneView.screenToBaseSurface(new Point2D(m.getX(), m.getY()));
      
      // create a polyline from (0.0, 0.0) to the mouse point
      var pointCollection = new PointCollection(SpatialReferences.getWgs84());
      pointCollection.addAll(List.of(new Point(0.0, 0.0), point));
      var ployline = new Polyline(pointCollection);
      
      // create and show the graphic
      graphicsOverlay.getGraphics().clear();
      var graphic = new Graphic(ployline, new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID,
        ColorUtil.colorToArgb(Color.RED), 5.0f));
      graphicsOverlay.getGraphics().add(graphic);
    });
  }

  @Override
  public void stop() {
    if (sceneView != null) {
      sceneView.dispose();
    }
  }

  public static void main(String[] args) {
    launch(args);
  }
}