PolyShapesController.java

// Fig. 22.6: PolyShapesController.java
// Drawing Polylines, Polygons and Paths.
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.scene.control.RadioButton;
import javafx.scene.control.ToggleGroup;
import javafx.scene.input.MouseEvent;
import javafx.scene.shape.ArcTo;    
import javafx.scene.shape.ClosePath;
import javafx.scene.shape.MoveTo;   
import javafx.scene.shape.Path;     
import javafx.scene.shape.Polygon;  
import javafx.scene.shape.Polyline; 

public class PolyShapesController {
   // enum representing shape types
   private enum ShapeType {POLYLINE, POLYGON, PATH};
   
   // instance variables that refer to GUI components
   @FXML private RadioButton polylineRadioButton;
   @FXML private RadioButton polygonRadioButton;
   @FXML private RadioButton pathRadioButton;
   @FXML private ToggleGroup toggleGroup;
   @FXML private Polyline polyline;
   @FXML private Polygon polygon;  
   @FXML private Path path;        

   // instance variables for managing state
   private ShapeType shapeType = ShapeType.POLYLINE; 
   private boolean sweepFlag = true; // used with arcs in a Path
   
   // set user data for the RadioButtons and display polyline object
   public void initialize() {
      // user data on a control can be any Object
      polylineRadioButton.setUserData(ShapeType.POLYLINE);
      polygonRadioButton.setUserData(ShapeType.POLYGON);
      pathRadioButton.setUserData(ShapeType.PATH);
      
      displayShape(); // sets polyline's visibility to true when app loads
   }
   
   // handles drawingArea's onMouseClicked event
   @FXML
   private void drawingAreaMouseClicked(MouseEvent e) {
      polyline.getPoints().addAll(e.getX(), e.getY());
      polygon.getPoints().addAll(e.getX(), e.getY()); 
    
      // if path is empty, move to first click position and close path
      if (path.getElements().isEmpty()) {
         path.getElements().add(new MoveTo(e.getX(), e.getY()));
         path.getElements().add(new ClosePath());               
      }
      else { // insert a new path segment before the ClosePath element
         // create an arc segment and insert it in the path
         ArcTo arcTo = new ArcTo();    
         arcTo.setX(e.getX());         
         arcTo.setY(e.getY());         
         arcTo.setRadiusX(100.0);      
         arcTo.setRadiusY(100.0);      
         arcTo.setSweepFlag(sweepFlag);
         sweepFlag = !sweepFlag;
         path.getElements().add(path.getElements().size() - 1, arcTo);
      }
   }
   
   // handles color RadioButton's ActionEvents
   @FXML
   private void shapeRadioButtonSelected(ActionEvent e) {
      // user data for each color RadioButton is a ShapeType constant
      shapeType =                                                  
         (ShapeType) toggleGroup.getSelectedToggle().getUserData();
      displayShape(); // display the currently selected shape
   } 

   // displays currently selected shape
   private void displayShape() {
      polyline.setVisible(shapeType == ShapeType.POLYLINE);
      polygon.setVisible(shapeType == ShapeType.POLYGON);
      path.setVisible(shapeType == ShapeType.PATH);         
   } 
   
   // resets each shape
   @FXML
   private void clearButtonPressed(ActionEvent event) {
      polyline.getPoints().clear();
      polygon.getPoints().clear(); 
      path.getElements().clear();  
   }
}