JavaFX - 2D Shapes Path Element Line

The path element line is used to draw a straight line to a point in the specified coordinates from the current position.
It is represented by a class named LineTo. This class belongs to the package javafx.scene.shape.
This class has 2 properties of the double datatype namely −
X − The x coordinate of the point to which a line is to be drawn from the current position.
X − The x coordinate of the point to which a line is to be drawn from the current position.
Y − The y coordinate of the point to which a line is to be drawn from the current position.
Y − The y coordinate of the point to which a line is to be drawn from the current position.
To draw a line, you need to pass values to these properties. This can be either done by passing them to the constructor of this class, in the same order, at the time of instantiation, as shown below −
LineTO line = new LineTo(x, y);

Or, by using their respective setter methods as follows −
setX(value); 
setY(value);

To draw a line to a specified point from the current position in JavaFX, follow the steps given below.
Create a Java class and inherit the Application class of the package javafx.application and implement the start() method of this class as follows.
public class ClassName extends Application {  
   @Override     
   public void start(Stage primaryStage) throws Exception {     
   }    
}
You can create the path class object as shown below.
//Creating a Path object 
Path path = new Path();

Create the MoveTo path element and set the XY coordinates to starting point of the line to the coordinates (100, 150). This can be done using the methods setX() and setY() of the class MoveTo as shown below.
//Moving to the starting point 
MoveTo moveTo = new MoveTo(); 
moveTo.setX(100.0f); 
moveTo.setY(150.0f);

Create the path element line by instantiating the class named LineTo which belongs to the package javafx.scene.shape as follows.
//Creating an object of the class LineTo  
LineTo lineTo = new LineTo(); 

Specify the coordinates of the point to which a line is to be drawn from the current position. This can be done by setting the properties x and y using their respective setter methods as shown in the following code block.
//Setting the Properties of the line element 
lineTo.setX(500.0f); 
lineTo.setY(150.0f);

Add the path elements MoveTo and LineTo created in the previous steps to the observable list of the Path class as shown below −
//Adding the path elements to Observable list of the Path class   
path.getElements().add(moveTo); 
path.getElements().add(lineTo); 

Create a group object by instantiating the class named Group, which belongs to the package javafx.scene.
Pass the Line (node) object created in the previous step as a parameter to the constructor of the Group class. This should be done in order to add it to the group as shown below −
Group root = new Group(line);

Create a Scene by instantiating the class named Scene which belongs to the package javafx.scene. To this class, pass the Group object (root) created in the previous step.
In addition to the root object, you can also pass two double parameters representing height and width of the screen along with the object of the Group class as follows.
Scene scene = new Scene(group ,600, 300);

You can set the title to the stage using the setTitle() method of the stage class. The primaryStage is a Stage object which is passed to the start method of the scene class, as a parameter.
Using the primaryStage object, set the title of the scene as Sample Application as follows.
primaryStage.setTitle("Sample Application");

You can add a Scene object to the stage using the method setScene() of the class named Stage. Add the Scene object prepared in the previous steps using this method as shown below −
primaryStage.setScene(scene)

Display the contents of the scene using the method named show() of the Stage class as follows.
primaryStage.show();

Launch the JavaFX application by calling the static method launch() of the Application class from the main method as follows.
public static void main(String args[]){   
   launch(args);      
}
The following program shows how to draw a straight line from the current point to a specified position using the class Path of JavaFX. Save this code in a file with the name LineToExample.java.
import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.shape.LineTo; 
import javafx.scene.shape.MoveTo; 
import javafx.scene.shape.Path; 
import javafx.stage.Stage;  

public class LineToExample extends Application { 
   @Override 
   public void start(Stage stage) {
      //Creating a Path object 
      Path path = new Path();  
      
      //Moving to the starting point 
      MoveTo moveTo = new MoveTo(); 
      moveTo.setX(100.0f); 
      moveTo.setY(150.0f); 
         
      //Instantiating the LineTo class  
      LineTo lineTo = new LineTo(); 
         
      //Setting the Properties of the line element 
      lineTo.setX(500.0f); 
      lineTo.setY(150.0f);      
       
      //Adding the path elements to Observable list of the Path class   
      path.getElements().add(moveTo); 
      path.getElements().add(lineTo); 
         
      //Creating a Group object  
      Group root = new Group(path); 
         
      //Creating a scene object 
      Scene scene = new Scene(root, 600, 300);  
      
      //Setting title to the Stage 
      stage.setTitle("Drawing a Line"); 
         
      //Adding scene to the stage 
      stage.setScene(scene); 
         
      //Displaying the contents of the stage 
      stage.show(); 
   }
   public static void main(String args[]){ 
      launch(args); 
   } 
}   
Compile and execute the saved java file from the command prompt using the following commands.
javac LineToExample.java 
java LineToExample

On executing, the above program generates a JavaFX window displaying a straight line, which is drawn from the current position to the specified point, as shown below.

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