Question:

(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

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.Slider?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.ColumnConstraints?>
<?import javafx.scene.layout.GridPane?>
<?import javafx.scene.layout.RowConstraints?>
<?import javafx.scene.shape.Circle?>
<?import javafx.scene.shape.Rectangle?>

//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));
}
}
);
}
}

Answer:

Painter.fxml:

<?xml version="1.0" encoding="UTF-8"?>
<?import javafx.geometry.Insets?>
<?import javafx.scene.control.Button?>
<?import javafx.scene.control.RadioButton?>
<?import javafx.scene.control.TitledPane?>
<?import javafx.scene.control.ToggleGroup?>
<?import javafx.scene.layout.BorderPane?>
<?import javafx.scene.layout.Pane?>
<?import javafx.scene.layout.VBox?>

output:

Painter Drawing Color Black Red Green Blue Pen Size Small Medium Large Undo Clear

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