Save the image painted by JavaFX on disk

We can save the image painted by JavaSE drive in this way:
ImageIO.write (bi BufferedImage);
Graphics g = bi.getGraphics ();
g.Draw...

In JavaFX, canvas is considered to be a node, we can use canvas.getGraphicsContext2D () to paint. But how to save us from these painted images?

Thank you.

Hello. Use Canvas.snapshot (sp, wi WritableImage SnapshotParameters);

Here is an example:

   import java.awt.image.BufferedImage;
import java.io.File;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.*;
import javafx.scene.image.*;

import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.*;
import javax.imageio.ImageIO;
import java.io.*;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.scene.shape.ArcType;
import javafx.scene.shape.Rectangle;

public class PrintCanvas extends Application {

    @Override
    public void start(Stage primaryStage) {

        StackPane root = new StackPane();

        Scene scene = new Scene(root, 400, 450);
        WritableImage wim = new WritableImage(300, 250);

        Canvas canvas = new Canvas(300, 250);
        GraphicsContext gc = canvas.getGraphicsContext2D();
        drawShapes(gc);
        canvas.snapshot(null, wim);
        root.getChildren().add(canvas);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();

        File file = new File("CanvasImage.png");

        try {
            ImageIO.write(SwingFXUtils.fromFXImage(wim, null), "png", file);
        } catch (Exception s) {
        }
    }

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

    private void drawShapes(GraphicsContext gc) {
        gc.setFill(Color.GREEN);
        gc.setStroke(Color.BLUE);
        gc.setLineWidth(5);
        gc.strokeLine(40, 10, 10, 40);
        gc.fillOval(10, 60, 30, 30);
        gc.strokeOval(60, 60, 30, 30);
        gc.fillRoundRect(110, 60, 30, 30, 10, 10);
        gc.strokeRoundRect(160, 60, 30, 30, 10, 10);
        gc.fillArc(10, 110, 30, 30, 45, 240, ArcType.OPEN);
        gc.fillArc(60, 110, 30, 30, 45, 240, ArcType.CHORD);
        gc.fillArc(110, 110, 30, 30, 45, 240, ArcType.ROUND);
        gc.strokeArc(10, 160, 30, 30, 45, 240, ArcType.OPEN);
        gc.strokeArc(60, 160, 30, 30, 45, 240, ArcType.CHORD);
        gc.strokeArc(110, 160, 30, 30, 45, 240, ArcType.ROUND);
        gc.fillPolygon(new double[]{10, 40, 10, 40},
                new double[]{210, 210, 240, 240}, 4);
        gc.strokePolygon(new double[]{60, 90, 60, 90},
                new double[]{210, 210, 240, 240}, 4);
        gc.strokePolyline(new double[]{110, 140, 110, 140},
                new double[]{210, 210, 240, 240}, 4);
    }
}

Tags: Java

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