(Painter App Modification) Incorporate the RGBA color chooser you created in the Color Chooser app into the Painter app so that the user can choose any drawing color. Changing a Slider's value should update the color swatch displayed to the user and set the brushColor instance variable to the current Color.

//Ex1303ModifiedPainterApp.java

package ex1303modifiedpainterapp;

import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage;

public class Ex1303ModifiedPainterApp extends Application { @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("Painter.fxml"));

Scene scene = new Scene(root); stage.setTitle("Painter"); // displayed in window's title bar stage.setScene(scene); stage.show(); }

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

//Painter.fxml

//PainterController.java

package ex1303modifiedpainterapp;

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.layout.Pane; import javafx.scene.paint.Color; import javafx.scene.paint.Paint; import javafx.scene.shape.Circle;

public class PainterController { // enum representing pen sizes private enum PenSize { SMALL(2), MEDIUM(4), LARGE(6);

private final int radius;

PenSize(int radius) {this.radius = radius;}

public int getRadius() {return radius;} };

// instance variables that refer to GUI components @FXML private RadioButton blackRadioButton; @FXML private RadioButton redRadioButton; @FXML private RadioButton greenRadioButton; @FXML private RadioButton blueRadioButton; @FXML private RadioButton smallRadioButton; @FXML private RadioButton mediumRadioButton; @FXML private RadioButton largeRadioButton; @FXML private Pane drawingAreaPane; @FXML private ToggleGroup colorToggleGroup; @FXML private ToggleGroup sizeToggleGroup;

// instance variables for managing Painter state private PenSize radius = PenSize.MEDIUM; // radius of circle private Paint brushColor = Color.BLACK; // drawing color

// set user data for the RadioButtons public void initialize() { // user data on a control can be any Object blackRadioButton.setUserData(Color.BLACK); redRadioButton.setUserData(Color.RED); greenRadioButton.setUserData(Color.GREEN); blueRadioButton.setUserData(Color.BLUE); smallRadioButton.setUserData(PenSize.SMALL); mediumRadioButton.setUserData(PenSize.MEDIUM); largeRadioButton.setUserData(PenSize.LARGE); }

// handles drawingArea's onMouseDragged MouseEvent @FXML private void drawingAreaMouseDragged(MouseEvent e) { Circle newCircle = new Circle(e.getX(), e.getY(), radius.getRadius(), brushColor); drawingAreaPane.getChildren().add(newCircle); }

// handles color RadioButton's ActionEvents @FXML private void colorRadioButtonSelected(ActionEvent e) { // user data for each color RadioButton is the corresponding Color brushColor = (Color) colorToggleGroup.getSelectedToggle().getUserData(); }

// handles size RadioButton's ActionEvents @FXML private void sizeRadioButtonSelected(ActionEvent e) { // user data for each size RadioButton is the corresponding PenSize radius = (PenSize) sizeToggleGroup.getSelectedToggle().getUserData(); }

// handles Undo Button's ActionEvents @FXML private void undoButtonPressed(ActionEvent event) { int count = drawingAreaPane.getChildren().size();

// if there are any shapes remove the last one added if (count > 0) { drawingAreaPane.getChildren().remove(count - 1); } }

// handles Clear Button's ActionEvents @FXML private void clearButtonPressed(ActionEvent event) { drawingAreaPane.getChildren().clear(); // clear the canvas } }

//ColorChooser.java

// Fig. 13.8: ColorChooser.java // Main application class that loads and displays the ColorChooser's GUI. import javafx.application.Application; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.stage.Stage;

public class ColorChooser extends Application { @Override public void start(Stage stage) throws Exception { Parent root = FXMLLoader.load(getClass().getResource("ColorChooser.fxml")); Scene scene = new Scene(root); stage.setTitle("Color Chooser"); stage.setScene(scene); stage.show(); }

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

//ColorChooser.fxml

//ColorChooserController

// Fig. 13.9: ColorChooserController.java // Controller for the ColorChooser app import javafx.beans.value.ChangeListener; import javafx.beans.value.ObservableValue; import javafx.fxml.FXML; import javafx.scene.control.Slider; import javafx.scene.control.TextField; import javafx.scene.paint.Color; import javafx.scene.shape.Rectangle;

public class ColorChooserController { // instance variables for interacting with GUI components @FXML private Slider redSlider; @FXML private Slider greenSlider; @FXML private Slider blueSlider; @FXML private Slider alphaSlider; @FXML private TextField redTextField; @FXML private TextField greenTextField; @FXML private TextField blueTextField; @FXML private TextField alphaTextField; @FXML private Rectangle colorRectangle;

// instance variables for managing private int red = 0; private int green = 0; private int blue = 0; private double alpha = 1.0; public void initialize() { // bind TextField values to corresponding Slider values redTextField.textProperty().bind( redSlider.valueProperty().asString("%.0f")); greenTextField.textProperty().bind( greenSlider.valueProperty().asString("%.0f")); blueTextField.textProperty().bind( blueSlider.valueProperty().asString("%.0f")); alphaTextField.textProperty().bind( alphaSlider.valueProperty().asString("%.2f")); // listeners that set Rectangle's fill based on Slider changes redSlider.valueProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, Number oldValue, Number newValue) { red = newValue.intValue(); colorRectangle.setFill(Color.rgb(red, green, blue, alpha)); } } ); greenSlider.valueProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, Number oldValue, Number newValue) { green = newValue.intValue(); colorRectangle.setFill(Color.rgb(red, green, blue, alpha)); } } ); blueSlider.valueProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, Number oldValue, Number newValue) { blue = newValue.intValue(); colorRectangle.setFill(Color.rgb(red, green, blue, alpha)); } } ); alphaSlider.valueProperty().addListener( new ChangeListener() { @Override public void changed(ObservableValue ov, Number oldValue, Number newValue) { alpha = newValue.doubleValue(); colorRectangle.setFill(Color.rgb(red, green, blue, alpha)); } } ); } }