Add FreeHand functionality in JavaFX - javafx

Question

Actually I am making an application which allows user to crop an image an then gives functionality of free-hand drawing and to also to draw different shapes. I have achieved functionality of cropping and drawing shapes like line etc. But I am facing some problems in free-hand drawing.
I have added my image on "HBox" and cropped that image through "Rectangle" in JavaFX class which is added on "Group". And all these are added on "Pane" class. Now for free-hand drawing, I am using "Canvas". Where to add canvas, whether on "HBox" or "Group" or "Pane" class. And Canvas is only initialized on clicking pencil button. I have added single functions for Mouse-Events and applied if-checks for different functionalities in those functions.
basically how to draw pencil on image or how to add lineTo on group.
Can someone please help me in solving my problem??
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package application;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.imageio.ImageIO;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Point2D;
import javafx.scene.Cursor;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.WritableImage;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Line;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.Rectangle;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
public class Main extends Application {
int dragStatus = 0;
double startingPointX;
double startingPointY;
double currentEndingPointX;
double currentEndingPointY;
BufferedImage bufferedImage;
Robot robot;
ImageView imageView;
Button pencilBtn;
Image image;
Pane rootPane;
HBox pictureRegion;
Scene scene;
Rectangle croppedArea;
Canvas canvas;
GraphicsContext gc;
WritableImage writableImage;
Group group = new Group();
Line line;
LineTo lineTo;
String shape;
Boolean canvasAdded;
#Override
public void start(Stage primaryStage) {
try {
int sleepTime = 120;
Thread.sleep(sleepTime);
pencilBtn = createButton("save.png");
pictureRegion = new HBox();
rootPane = new Pane();
scene = new Scene(rootPane);
robot = new Robot();
java.awt.Rectangle capture = new java.awt.Rectangle(Toolkit.getDefaultToolkit().getScreenSize());
bufferedImage = robot.createScreenCapture(capture);
image = ConvertBufferedToJavaFXImage.convertToFxImage(bufferedImage);
pencilBtn.setOnAction(e -> geometrySelection("pencil"));
croppedArea = new Rectangle();
if(canvas != null) {
canvas.setOnMousePressed(e -> onMousePressed(e));
canvas.setOnMousePressed(e -> onMouseDragged(e));
}
imageView = new ImageView(image);
scene.setOnMouseEntered(e -> onMouseEntered(e, "scene"));
scene.setOnMousePressed(e -> onMousePressed(e));
scene.setOnMouseReleased(e -> onMouseReleased(e));
scene.setOnMouseDragged(e -> onMouseDragged(e));
pictureRegion.getChildren().add(imageView);
rootPane.getChildren().add(pictureRegion);
rootPane.getChildren().add(group);
scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
primaryStage.setMaximized(true);
primaryStage.setScene(scene);
primaryStage.show();
} catch (Exception e) {
e.printStackTrace();
}
}
public void onMouseEntered(MouseEvent ev, String nodeType) {
if (nodeType == "scene") {
scene.setCursor(Cursor.CROSSHAIR);
} else if (nodeType == "croppedArea") {
croppedArea.setCursor(Cursor.TEXT);
//croppedArea.setOnMousePressed(e -> onMousePressed(e));
} else if (nodeType == "btn") {
pencilBtn.setCursor(Cursor.HAND);
}
}
public void onMousePressed(MouseEvent event) {
if ((startingPointX < event.getX() && event.getX() < currentEndingPointX)
&& (startingPointY < event.getY() && event.getY() < currentEndingPointY)) {
if(shape == "pencil") {
lineTo = new LineTo();
System.out.println("lineTo1");
gc.beginPath();
gc.lineTo(event.getX(), event.getY());
gc.stroke();
}
} else {
shape = "croppedArea";
rootPane.getChildren().remove(canvas);
group.getChildren().clear();
startingPointX = event.getX();
startingPointY = event.getY();
group.getChildren().add(croppedArea);
}
}
public void onMouseDragged(MouseEvent event) {
dragStatus = 1;
if (dragStatus == 1) {
// if((startingPointX < event.getX() && event.getX() < currentEndingPointX)
// && (startingPointY < event.getY() && event.getY() < currentEndingPointY)) {
if(shape == "pencil") {
System.out.println("lineTo1");
gc.lineTo(event.getX(), event.getY());
gc.stroke();
}
else {
currentEndingPointX = event.getX();
currentEndingPointY = event.getY();
rootPane.getChildren().remove(pencilBtn);
croppedArea.setFill(Color.TRANSPARENT);
croppedArea.setStroke(Color.BLACK);
croppedArea.setOnMouseEntered(e -> onMouseEntered(e, "croppedArea"));
adjustRectangleProperties(startingPointX, startingPointY, currentEndingPointX, currentEndingPointY,
croppedArea);
}
}
}
public void geometrySelection(String tempShape) {
if(tempShape == "pencil") {
shape = "pencil";
canvas = new Canvas();
gc = canvas.getGraphicsContext2D();
//gc.setFill(Color.LIGHTGRAY);
gc.setStroke(Color.BLACK);
gc.setLineWidth(5);
canvas.setLayoutX(startingPointX);
canvas.setLayoutY(startingPointY);
canvas.setWidth(croppedArea.getWidth());
canvas.setHeight(croppedArea.getHeight());
System.out.println("canvasAdded");
group.getChildren().add(canvas);
}
}
public void onMouseReleased(MouseEvent event) {
if(dragStatus == 1) {
if(shape == "croppedArea") {
if (croppedArea.getHeight() > 0 && croppedArea.getWidth() > 0) {
pencilBtn.setLayoutX(Math.max(startingPointX, currentEndingPointX) + 5);
pencilBtn.setLayoutY(Math.max(startingPointY, currentEndingPointY) - 120);
rootPane.getChildren().add(pencilBtn);
dragStatus = 0;
}
}
bufferedImage = robot.createScreenCapture(new java.awt.Rectangle((int) startingPointX, (int) startingPointY,
(int) croppedArea.getWidth(), (int) croppedArea.getHeight()));
}
}
void adjustRectangleProperties(Double startingPointX, Double startingPointY, Double currentEndingPointX,
Double currentEndingPointY, Rectangle givenRectangle) {
givenRectangle.setX(startingPointX);
givenRectangle.setY(startingPointY);
givenRectangle.setWidth(currentEndingPointX - startingPointX);
givenRectangle.setHeight(currentEndingPointY - startingPointY);
if (givenRectangle.getWidth() < 0) {
givenRectangle.setWidth(-givenRectangle.getWidth());
givenRectangle.setX(givenRectangle.getX() - givenRectangle.getWidth());
}
if (givenRectangle.getHeight() < 0) {
givenRectangle.setHeight(-givenRectangle.getHeight());
givenRectangle.setY(givenRectangle.getY() - givenRectangle.getHeight());
}
}
public Button createButton(String imageName) throws FileNotFoundException {
FileInputStream iconFile = new FileInputStream(imageName);
Image iconImage = new Image(iconFile);
Button button = new Button();
button.setGraphic(new ImageView(iconImage));
button.setMaxSize(20, 20);
button.setPadding(Insets.EMPTY);
return button;
}
public static void main(String[] args) {
launch(args);
}
}
`