Friday, January 11, 2013

Load a re-sized image

Last post demonstrate how to "Load image file as InputStream". By providing extra parameters of requestedWidth, requestedHeigh, preserveRatio and smooth, we can create a re-sized image.

Load a re-sized image
Load a re-sized image

package javafxpixel;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
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.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javax.imageio.ImageIO;

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

Label label;
ImageView myImageView;

@Override
public void start(Stage primaryStage) {

Button btnLoad = new Button("Load");
btnLoad.setOnAction(btnLoadEventListener);

label = new Label();
myImageView = new ImageView();

VBox rootBox = new VBox();
rootBox.getChildren().addAll(btnLoad, label, myImageView);

Scene scene = new Scene(rootBox, 300, 300);

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

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

EventHandler<ActionEvent> btnLoadEventListener
= new EventHandler<ActionEvent>(){

@Override
public void handle(ActionEvent t) {
FileChooser fileChooser = new FileChooser();

//Set extension filter
FileChooser.ExtensionFilter extFilterJPG = new FileChooser.ExtensionFilter("JPG files (*.jpg)", "*.JPG");
FileChooser.ExtensionFilter extFilterPNG = new FileChooser.ExtensionFilter("PNG files (*.png)", "*.PNG");
fileChooser.getExtensionFilters().addAll(extFilterJPG, extFilterPNG);

//Show open file dialog
File file = fileChooser.showOpenDialog(null);

String path = file.getAbsolutePath();
label.setText(path);

try {
InputStream inputStream = new FileInputStream(path);
Image image = new Image(inputStream,
300, //requestedWidth
300, //requestedHeigh
true, //preserveRatio
true); //smooth
myImageView.setImage(image);
} catch (FileNotFoundException ex) {
Logger.getLogger(JavaFXPixel.class.getName()).log(Level.SEVERE, null, ex);
}

}
};
}


Compare with "Auto fit JavaFX 2 ImageView".

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