Color.deriveColor() example

Example of setting of hueShift, saturationFactor, brightnessFactor, opacityFactor in Color.deriveColor().

package javafx8image;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelReader;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX8Image extends Application {

    Image imageSrc;
    
    Slider sliderHueShift;
    Slider sliderSaturationFactor;
    Slider sliderBrightnessFactor;
    Slider sliderOpacityFactor;
    ImageView imageViewDest;
    
    @Override
    public void start(Stage primaryStage) {
        
        imageSrc = new Image("http://goo.gl/kYEQl");
        
        sliderHueShift = new Slider(0, 360, 0);
        sliderSaturationFactor = new Slider(0, 1, 1);
        sliderBrightnessFactor = new Slider(0, 1, 1);
        sliderOpacityFactor = new Slider(0, 1, 1);
        sliderHueShift.valueProperty().addListener(listener);
        sliderSaturationFactor.valueProperty().addListener(listener);
        sliderBrightnessFactor.valueProperty().addListener(listener);
        sliderOpacityFactor.valueProperty().addListener(listener);

        imageViewDest = new ImageView();

        WritableImage imageDest = copyImage(imageSrc, 
                sliderHueShift.getValue(), 
                sliderSaturationFactor.getValue(), 
                sliderBrightnessFactor.getValue(), 
                sliderOpacityFactor.getValue());
        imageViewDest.setImage(imageDest);

        VBox vBox = new VBox();
        vBox.getChildren().addAll(
                new Label("hueShift"),
                sliderHueShift, 
                new Label("saturationFactor"),
                sliderSaturationFactor, 
                new Label("brightnessFactor"),
                sliderBrightnessFactor, 
                new Label("opacityFactor"),
                sliderOpacityFactor, 
                imageViewDest);

        StackPane root = new StackPane();
        root.getChildren().addAll(vBox);

        Scene scene = new Scene(root, 640, 360);

        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    ChangeListener<Number> listener = new ChangeListener<Number>(){

        @Override
        public void changed(ObservableValue<? extends Number> observable, 
                Number oldValue, Number newValue) {
            WritableImage imageDest = copyImage(imageSrc, 
                sliderHueShift.getValue(), 
                sliderSaturationFactor.getValue(), 
                sliderBrightnessFactor.getValue(), 
                sliderOpacityFactor.getValue());
        imageViewDest.setImage(imageDest);
        }
    };

    private WritableImage copyImage(
            Image src, 
            double hueShift, 
            double saturationFactor, 
            double brightnessFactor,
            double opacityFactor) {

        PixelReader pixelReader = src.getPixelReader();
        WritableImage dest
                = new WritableImage(
                        (int) src.getWidth(),
                        (int) src.getHeight());
        PixelWriter pixelWriter = dest.getPixelWriter();

        for (int y = 0; y < src.getHeight(); y++) {
            for (int x = 0; x < src.getWidth(); x++) {
                Color color = pixelReader.getColor(x, y);

                color = color.deriveColor(
                        hueShift,
                        saturationFactor,
                        brightnessFactor,
                        opacityFactor);
                        
                pixelWriter.setColor(x, y, color);
            }
        }

        return dest;
    }

}

Various effect of creating Color with brighter(), darker(), saturate(), desaturate(), grayscale() and invert().

This example show various effect of creating Color when copying image, with brighter(), darker(), saturate(), desaturate(), grayscale() and invert().

package javafx8image;

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelReader;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX8Image extends Application {

    @Override
    public void start(Stage primaryStage) {
        
        Image imageSrc = new Image("http://goo.gl/kYEQl");
        
        ListView listView = new ListView();
        ImageView imageViewDest = new ImageView();
        
        ObservableList<String> items =
            FXCollections.observableArrayList (
                "NO", "brighter", "darker", "saturate", "desaturate", 
                "grayscale", "invert");
        listView.setItems(items);
        
        listView.getSelectionModel().selectedItemProperty().addListener(
                new ChangeListener<String>(){

            @Override
            public void changed(ObservableValue<? extends String> observable, 
                    String oldValue, String newValue) {
                WritableImage imageDest = copyImage(imageSrc, 
                        (String)listView.getSelectionModel().getSelectedItem());
                imageViewDest.setImage(imageDest);
            }
        });

        WritableImage imageDest = copyImage(imageSrc, 
                (String)listView.getSelectionModel().getSelectedItem());
        imageViewDest.setImage(imageDest);

        HBox hBox = new HBox();
        hBox.getChildren().addAll(imageViewDest, listView);

        StackPane root = new StackPane();
        root.getChildren().addAll(hBox);

        Scene scene = new Scene(root, 300, 250);

        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

    private WritableImage copyImage(Image src, String op) {

        PixelReader pixelReader = src.getPixelReader();
        WritableImage dest
                = new WritableImage(
                        (int) src.getWidth(),
                        (int) src.getHeight());
        PixelWriter pixelWriter = dest.getPixelWriter();

        for (int y = 0; y < src.getHeight(); y++) {
            for (int x = 0; x < src.getWidth(); x++) {
                Color color = pixelReader.getColor(x, y);

                if(op!=null){
                    switch(op){
                    case "brighter":
                        color = color.brighter();
                        break;
                    case "darker":
                        color = color.darker();
                        break;
                    case "saturate":
                        color = color.saturate();
                        break;
                    case "desaturate":
                        color = color.desaturate();
                        break;
                    case "grayscale":
                        color = color.grayscale();
                        break;
                    case "invert":
                        color = color.invert();
                        break;
                    }
                }
                
                pixelWriter.setColor(x, y, color);
            }
        }

        return dest;
    }

}

PixelReader, PixelWriter and WritableImage

Example to show how to copy image to WritableImage with PixelReader, PixelWriter.

package javafx8image;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.image.PixelReader;
import javafx.scene.image.PixelWriter;
import javafx.scene.image.WritableImage;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX8Image extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        
        Button btn = new Button();
        ImageView imageView = new ImageView();
        ImageView imageViewDest = new ImageView();
        Label label = new Label();
        
        imageView.setOnMouseClicked(new EventHandler<MouseEvent>(){

            @Override
            public void handle(MouseEvent event) {
                imageView.setImage(null);
                imageViewDest.setImage(null);
                label.setText("");
            }
        });

        
        btn.setText("Load image");
        btn.setOnAction(new EventHandler<ActionEvent>() {
            
            @Override
            public void handle(ActionEvent event) {
                Image image = new Image("http://goo.gl/kYEQl");
                imageView.setImage(image);
                
                //copy image
                PixelReader pixelReader = image.getPixelReader();
                WritableImage writableImage = 
                    new WritableImage(
                        (int)image.getWidth(), 
                        (int)image.getHeight());
                PixelWriter pixelWriter = writableImage.getPixelWriter();
                
                for(int y=0; y<image.getHeight(); y++){
                    for(int x=0; x<image.getWidth(); x++){
                        Color color = pixelReader.getColor(x, y);
                        color = color.brighter();
                        pixelWriter.setColor(x, y, color);
                    }
                }
                
                imageViewDest.setImage(writableImage);
                label.setText(image.getWidth() + " x " + image.getHeight());
            }
        });
        
        VBox vBox = new VBox();
        vBox.getChildren().addAll(btn, imageView, imageViewDest, label);
        
        StackPane root = new StackPane();
        root.getChildren().addAll(vBox);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

Next:
- Various effect of creating Color with brighter(), darker(), saturate(), desaturate(), grayscale() and invert().

JavaFX 8 ImageView, and detect MouseEvent

package javafx8image;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX8Image extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        
        ImageView imageView = new ImageView();
        
        imageView.setOnMouseClicked(new EventHandler<MouseEvent>(){

            @Override
            public void handle(MouseEvent event) {
                imageView.setImage(null);
            }
        });

        Button btn = new Button();
        btn.setText("Load image");
        btn.setOnAction(new EventHandler<ActionEvent>() {
            
            @Override
            public void handle(ActionEvent event) {
                imageView.setImage(new Image("http://goo.gl/kYEQl"));
            }
        });
        
        StackPane root = new StackPane();
        root.getChildren().addAll(btn, imageView);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

Use Lambda expression

package javafx8imagelambda;

import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.ActionEvent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFX8ImageLambda extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        
        ImageView imageView = new ImageView();
        
        //use Lambda expression
        imageView.setOnMouseClicked((MouseEvent event) -> {
            imageView.setImage(null);
        });

        Button btn = new Button();
        btn.setText("Load image");
        
        //use Lambda expression
        btn.setOnAction((ActionEvent event) -> {
            imageView.setImage(new Image("http://goo.gl/kYEQl"));
        });
        
        StackPane root = new StackPane();
        root.getChildren().addAll(btn, imageView);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

Draw ArrayList of Path on canvas

This example implement a ArrayList of Path, to store Paths. Then draw on canvas using GraphicsContext.

package javafxdrawpatharray;

import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;
import javafx.scene.shape.PathElement;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXDrawPathArray extends Application {
    
    List<Path> pathList;
    
    @Override
    public void start(Stage primaryStage) {
        Canvas canvas = new Canvas(300, 250);
        GraphicsContext graphicsContext = canvas.getGraphicsContext2D();
        
        initPathList();
        drawSomething(graphicsContext);
         
        StackPane root = new StackPane();
        root.getChildren().add(canvas);
        Scene scene = new Scene(root, 300, 250);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    private void initPathList(){
        pathList = new ArrayList<>();
        
        Path p = new Path();
        p.getElements().add(new MoveTo(50, 50));
        p.getElements().add(new LineTo(50, 200));
        p.getElements().add(new LineTo(100, 200));
        p.getElements().add(new LineTo(100, 100));
        p.getElements().add(new LineTo(200, 100));
        pathList.add(p);
        
        p = new Path();
        p.getElements().add(new MoveTo(60, 60));
        p.getElements().add(new LineTo(60, 210));
        p.getElements().add(new LineTo(110, 210));
        p.getElements().add(new LineTo(110, 110));
        p.getElements().add(new LineTo(210, 110));
        pathList.add(p);  
        
        p = new Path();
        p.getElements().add(new MoveTo(70, 70));
        p.getElements().add(new LineTo(70, 220));
        p.getElements().add(new LineTo(120, 220));
        p.getElements().add(new LineTo(120, 120));
        p.getElements().add(new LineTo(220, 120));
        pathList.add(p); 
    }
    
    private void drawSomething(GraphicsContext gc){
        
        gc.setFill(Color.RED);
        gc.setStroke(Color.BLUE);
        gc.setLineWidth(1);

        for(Path p : pathList){
            
            ObservableList<PathElement> l = p.getElements();
            
            gc.beginPath();
            for (PathElement pe : l){
                if(pe.getClass()==MoveTo.class){
                    gc.moveTo(((MoveTo)pe).getX(), ((MoveTo)pe).getY());
                }else if(pe.getClass()==LineTo.class){
                    gc.lineTo(((LineTo)pe).getX(), ((LineTo)pe).getY());
                }
            }
            gc.stroke();
            gc.closePath();
        }
    }
    
}

Use functional operation version:

package javafxdrawpatharray2;

import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.collections.ObservableList;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;
import javafx.scene.shape.PathElement;
import javafx.stage.Stage;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaFXDrawPathArray2 extends Application {
    
    List<Path> pathList;
    
    @Override
    public void start(Stage primaryStage) {
        Canvas canvas = new Canvas(300, 250);
        GraphicsContext graphicsContext = canvas.getGraphicsContext2D();
        
        initPathList();
        drawSomething(graphicsContext);
         
        StackPane root = new StackPane();
        root.getChildren().add(canvas);
        Scene scene = new Scene(root, 300, 250);
        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
    
    private void initPathList(){
        pathList = new ArrayList<>();
        
        Path p = new Path();
        p.getElements().add(new MoveTo(50, 50));
        p.getElements().add(new LineTo(50, 200));
        p.getElements().add(new LineTo(100, 200));
        p.getElements().add(new LineTo(100, 100));
        p.getElements().add(new LineTo(200, 100));
        pathList.add(p);
        
        p = new Path();
        p.getElements().add(new MoveTo(60, 60));
        p.getElements().add(new LineTo(60, 210));
        p.getElements().add(new LineTo(110, 210));
        p.getElements().add(new LineTo(110, 110));
        p.getElements().add(new LineTo(210, 110));
        pathList.add(p);  
        
        p = new Path();
        p.getElements().add(new MoveTo(70, 70));
        p.getElements().add(new LineTo(70, 220));
        p.getElements().add(new LineTo(120, 220));
        p.getElements().add(new LineTo(120, 120));
        p.getElements().add(new LineTo(220, 120));
        pathList.add(p); 
    }
    
    private void drawSomething(GraphicsContext gc){
        
        gc.setFill(Color.RED);
        gc.setStroke(Color.BLUE);
        gc.setLineWidth(1);

        pathList.stream().map((p) -> p.getElements()).map((l) -> {
            gc.beginPath();
            l.stream().forEach((pe) -> {
                if(pe.getClass()==MoveTo.class){
                    gc.moveTo(((MoveTo)pe).getX(), ((MoveTo)pe).getY());
                }else if(pe.getClass()==LineTo.class){
                    gc.lineTo(((LineTo)pe).getX(), ((LineTo)pe).getY());
                }
            });
            return l;
        }).map((_item) -> {
            gc.stroke();
            return _item;
        }).forEach((_item) -> {
            gc.closePath();
        });
    }
    
}