JavaFX: Polygon shape

 Polygon is a shape with 'n' sides. For example, an Octagon has 8 sides. ‘Polygon’ class is used to define a polygon.

 

How to define a polygon?

You can define a polygon by specifying sequence of x and y coordinates for each side. Since Polygon is a closed shape, last point automatically connected to first point.

 

Polygon class provides following constructors to define a polygon.

 

public Polygon()

public Polygon(double... points)

points: the coordinates of the polygon vertices

 

Example

Polygon polygon1 = new Polygon();

Polygon polygon2 = new Polygon(15.0, 350.0, 150.0, 350.0, 75.0, 150.0);

 

FXML to create a triangle

<Polygon fx:id="triangle"  fill="lightgreen" stroke="black" strokeWidth="5"

         points="15.0, 350.0, 150.0, 350.0, 75.0, 150.0"/>

        

FXML to create Trapezium

<Polygon fx:id="trapezium"  fill="lightsalmon" stroke="black" strokeWidth="5"

         points="100.0, 50.0, 150.0, 50.0, 150.0, 100.0, 100.0, 150.0"/>

 

Find the below working application.

 

polygonDemo.fxml

<?import javafx.scene.*?>
<?import javafx.scene.shape.*?>
<?import javafx.scene.layout.*?>
<?import javafx.scene.text.*?>

<Group xmlns:fx="http://javafx.com/fxml" fx:controller="com.sample.app.controller.PolygonController">

	<Polygon fx:id="triangle"  fill="lightgreen" stroke="black" strokeWidth="5"
		points="15.0, 350.0, 150.0, 350.0, 75.0, 150.0"/>
		
	<Polygon fx:id="trapezium"  fill="lightsalmon" stroke="black" strokeWidth="5"
		points="100.0, 50.0, 150.0, 50.0, 150.0, 100.0, 100.0, 150.0"/>
	
</Group>

 

PolygonController.java

package com.sample.app.controller;

import java.net.URL;
import java.util.ResourceBundle;

import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.shape.Polygon;

public class PolygonController implements Initializable {

	@FXML
	private Polygon triangle;
	
	@FXML
	private Polygon trapezium;


	
	@Override
	public void initialize(URL location, ResourceBundle resources) {

	}

}

 

PolygonDemo.java

package com.sample.app;

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

public class PolygonDemo extends Application {

	private static final String FXML_FILE = "/polygonDemo.fxml";
	private static final String STAGE_TITLE = "Polygon Demo";

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

	}

	@Override
	public void start(Stage primaryStage) throws Exception {

		Parent root = (Parent) FXMLLoader.load(this.getClass().getResource(FXML_FILE));

		Scene scene = new Scene(root, 300, 500, Color.WHITE);

		primaryStage.setTitle(STAGE_TITLE);
		primaryStage.setScene(scene);
		primaryStage.show();
	}

}

 

Output

 

  

Previous                                                    Next                                                    Home