JavaFX | ColorInput Class

ColorInput class is a part of JavaFX. It is used to create an effect which renders a rectangular region, filled with the given Color. It is equivalent to rendering a filled rectangle into an image and using an ImageInput effect, except that it is more convenient and potentially much more efficient. It is mainly passed into the other effects as an input.

Constructors of the class:

1. ColorInput(): Creates a new instance of ColorInput with default parameters.
2. ColorInput(double x, double y, double width, double height, Paint paint): Creates a new instance of ColorInput with the specified x, y, width, height, and paint.

Commonly Used Methods:

Method	Description
getX()	Gets the value of the property x.
getY()	Gets the value of the property y.
setHeight(double value)	Sets the value of the property height
setPaint(Paint value)	Sets the value of the property paint.
setWidth(double value)	Sets the value of the property width.
setX(double value)	Sets the value of the property x.
setY(double value)	Sets the value of the property y.
getHeight()	Gets the value of the property height.
getPaint()	Gets the value of the property paint.
getWidth()	Gets the value of the property width

1. Java program to Demonstrate ColorInput class: In this program, ColorInput Effect is created and then we set the color, height, width, and coordinates of the region of ColorInput. A group object and scene object is created. A scene is added to the stage and then we set the title of the stage.

   // Java program to Demonstrate ColorInput class
   import javafx.application.Application;
   import javafx.scene.Group;
   import javafx.scene.Scene;
   import javafx.scene.effect.ColorInput;
   import javafx.scene.paint.Color;
   import javafx.scene.shape.Rectangle;
   import javafx.stage.Stage;
   
   public class ColorInputDemo extends Application {
   
       // Main Method
       public static void main(String[] args)
       {
   
           // launch the application
           launch(args);
       }
   
       // launch the application
       public void start(Stage primaryStage) throws Exception
       {
   
           // Instantiating the ColorInput class
           ColorInput color = new ColorInput();
   
           // set the color
           color.setPaint(Color.GREEN);
   
           // sets the height of the region of color input
           color.setHeight(50);
   
           // sets the width of the region of color input
           color.setWidth(200);
   
           // set the coordinates of the Colorinput
           color.setX(90);
           color.setY(140);
   
           // create a rectangle
           Rectangle rect = new Rectangle();
   
           // applying coloradjust effect
           rect.setEffect(color);
   
           // create a group object
           Group root = new Group();
   
           // create a scene object
           Scene scene = new Scene(root, 400, 300);
   
           root.getChildren().add(rect);
   
           // adding scene to the stage
           primaryStage.setScene(scene);
   
           // set title of the stage
           primaryStage.setTitle("ColorInput Demo");
   
           primaryStage.show();
       }
   }

   Output:

   

2. Java program to apply ColorInput class to the created rectangle by clicking on the button using EventHandler: In this program, we first set the Height, Width, and coordinates of a rectangle and then create a rectangle of the same dimension. Now, create a Button and set the Layouts of the Button. Now, using EventHandler, first, instantiate a ColorInput class using proper dimension and then set ColorInput Effect to the Button. Create a group object and add Button and rectangle to it. Then Create a Scene and add it to the stage.

   // Java program to apply ColorInput class to
   // the created rectangle by clicking on the
   // button using EventHandler
   import javafx.application.Application;
   import javafx.event.ActionEvent;
   import javafx.event.EventHandler;
   import javafx.scene.Group;
   import javafx.scene.Scene;
   import javafx.scene.control.Button;
   import javafx.scene.effect.ColorInput;
   import javafx.scene.paint.Color;
   import javafx.scene.shape.Rectangle;
   import javafx.stage.Stage;
   
   public class ColorInputExample extends Application {
   
       public void start(Stage stage)
       {
   
           double x = 10;
           double y = 10;
           double w = 40;
           double h = 180;
   
           // Rectangle
           Rectangle rect = new Rectangle(x, y, w, h);
           rect.setFill(Color.WHITE);
           rect.setStrokeWidth(1);
           rect.setStroke(Color.BLACK);
   
           // Button
           Button button = new Button("Click To See the Effects!");
   
           // set button layout coordinates
           button.setLayoutX(100);
           button.setLayoutY(30);
   
           button.setPrefSize(250, 150);
   
           button.setOnAction(new EventHandler<ActionEvent>() {
   
               public void handle(ActionEvent event)
               {
                   // instantiating the colorinput class
                   ColorInput colorInput = new ColorInput(x, y,
                                        w, h, Color.STEELBLUE);
   
                   // Setting ColorInput effect
                   button.setEffect(colorInput);
               }
           });
   
           // create the Group object
           Group root = new Group();
   
           root.getChildren().addAll(button, rect);
   
           Scene scene = new Scene(root, 450, 300);
           stage.setTitle("JavaFX ColorInput Effect");
           stage.setScene(scene);
   
           stage.show();
       }
   
       // Main Method
       public static void main(String args[])
       {
   
           // Launch the application
           launch(args);
       }
   }

   Output:
   

Note: The above programs might not run in an online IDE. Please use an offline compiler.

Reference: https://docs.oracle.com/javafx/2/api/javafx/scene/effect/ColorInput.html