JavaFX - HLineTo Path Object

The path element HLineTo is used to draw a horizontal line to a point in the specified coordinates from the current position.

It is represented by a class named HLineTo. This class belongs to the package javafx.scene.shape.

This class has a property of the double datatype namely −

  • X − The x coordinate of the point to which a horizontal line is to be drawn from the current position.

To draw a path element horizontal line, you need to pass a value to this property. This can be either done by passing it to the constructor of this class, at the time of instantiation; Or, by using their respective setter methods.

Steps to draw PathElement Horizontal Line

Follow the steps given below to draw a horizontal line to a specified point from the current position in JavaFX.

Step 1: Creating a Path Object

We first create a Path object by instantiating the Path class within the start() method of Application class as shown below −

public class ClassName extends Application {  
   @Override     
   public void start(Stage primaryStage) throws Exception {
      //Creating a Path object 
      Path path = new Path()   
   }    
}

Step 2: Setting the Initial Point

Create the MoveTo path element and set XY coordinates to starting point of the line to the coordinates (100, 150). This can be done by 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);

Step 3: Creating an Object of the Class HLineTo

Create the path element horizontal line by instantiating the class named HLineTo which belongs to the package javafx.scene.shape as shown below.

//Creating an object of the class HLineTo  
HLineTo hLineTo = new HLineTo();

Step 4: Setting Properties to the Horizontal Line Element

Specify the x coordinate of the point to which a horizontal line is to be drawn from the current position. This can be done by setting the property x, using the method setX() of the HLineTo class as shown below.

//Setting the Properties of the horizontal line element 
hlineTo.setX(400)

Step 5: Adding Elements to the Observable List of Path Class

Add the path elements MoveTo and HlineTo 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(hlineTo);

Step 6: Launching Application

Once the HLineTo path object is created, follow the given steps below to launch the application properly −

  • Firstly, instantiate the class named Scene by passing the Group object as a parameter value to its constructor. To this constructor, you can also pass dimensions of the application screen as optional parameters.

  • Then, set the title to the stage using the setTitle() method of the Stage class.

  • Now, a Scene object is added to the stage using the setScene() method of the class named Stage.

  • Display the contents of the scene using the method named show().

  • Lastly, the application is launched with the help of the launch() method.

Example

Following is a program which draws a horizontal line from the current point to a specified position using the class Path of JavaFX. Save this code in a file with the name − HLineToExample.java.

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.stage.Stage;
import javafx.scene.shape.HLineTo; 
import javafx.scene.shape.MoveTo; 
import javafx.scene.shape.Path;    
   
public class HLineToExample extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Creating an object of the Path class 
      Path path = new Path(); 
       
      //Moving to the starting point 
      MoveTo moveTo = new MoveTo(); 
      moveTo.setX(100.0); 
      moveTo.setY(150.0); 
       
      //Instantiating the HLineTo class 
      HLineTo hLineTo = new HLineTo();       
         
      //Setting the properties of the path element horizontal line 
      hLineTo.setX(10.0); 
       
      //Adding the path elements to Observable list of the Path class 
      path.getElements().add(moveTo); 
      path.getElements().add(hLineTo); 
         
      //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 horizontal 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 --module-path %PATH_TO_FX% --add-modules javafx.controls HLineToExample.java 
java --module-path %PATH_TO_FX% --add-modules javafx.controls HLineToExample

Output

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

Drawing Horizontal Line

Example

In this example, we are trying to draw a more complex path, i.e. triangle, using the horizontal line. Save this code in a file with the name − HLineToTriangle.java.

import javafx.application.Application; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.stage.Stage;
import javafx.scene.shape.HLineTo;
import javafx.scene.shape.LineTo; 
import javafx.scene.shape.MoveTo; 
import javafx.scene.shape.Path;    
   
public class HLineToTriangle extends Application { 
   @Override 
   public void start(Stage stage) { 
      //Creating an object of the Path class 
      Path path = new Path(); 
       
      //Drawing a triangular path
      MoveTo moveTo = new MoveTo(); 
      moveTo.setX(200.0); 
      moveTo.setY(150.0);       
      HLineTo hLineTo = new HLineTo();                
      hLineTo.setX(100.0);

      MoveTo moveTo2 = new MoveTo(); 
      moveTo2.setX(100.0); 
      moveTo2.setY(150.0);        
      LineTo lineTo = new LineTo();                
      lineTo.setX(150.0);
      lineTo.setY(50.0);

      MoveTo moveTo3 = new MoveTo(); 
      moveTo3.setX(150.0); 
      moveTo3.setY(50.0);        
      LineTo lineTo2 = new LineTo();       
      lineTo2.setX(200.0);
      lineTo2.setY(150.0);	  
       
      //Adding the path elements to Observable list of the Path class 
      path.getElements().add(moveTo); 
      path.getElements().add(hLineTo);
      path.getElements().add(moveTo2); 
      path.getElements().add(lineTo);
      path.getElements().add(moveTo3); 
      path.getElements().add(lineTo2);	  
         
      //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 Triangular Path"); 
         
      //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 --module-path %PATH_TO_FX% --add-modules javafx.controls HLineToTriangle.java 
java --module-path %PATH_TO_FX% --add-modules javafx.controls HLineToTriangle

Output

On executing, the above program generates a JavaFX window displaying a triangle.

Drawing Horizontal Line
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