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 *    notice, this list of conditions and the following disclaimer.
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package ensemble.samples.scenegraph.events.multitouch;

import javafx.event.EventHandler;
import javafx.scene.effect.BlurType;
import javafx.scene.effect.DropShadow;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.RotateEvent;
import javafx.scene.input.ZoomEvent;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;

public class MultiTouchImageView extends StackPane {

    private ImageView imageView;
    private double lastX, lastY, startScale, startRotate;

    public MultiTouchImageView(Image img) {
        setEffect(new DropShadow(BlurType.GAUSSIAN, Color.rgb(0, 0, 0, 0.5), 8, 0, 0, 2));

        imageView = new ImageView(img);
        imageView.setSmooth(true);
        getChildren().add(imageView);

        setOnMousePressed((MouseEvent event) -> {
            lastX = event.getX();
            lastY = event.getY();
            toFront();
            //  postView.toFront();
        });
        setOnMouseDragged((MouseEvent event) -> {
            double layoutX = getLayoutX() + (event.getX() - lastX);
            double layoutY = getLayoutY() + (event.getY() - lastY);
            
            if ((layoutX >= 0) && (layoutX <= (getParent().getLayoutBounds().getWidth()))) {
                setLayoutX(layoutX);
            }
            
            if ((layoutY >= 0) && (layoutY <= (getParent().getLayoutBounds().getHeight()))) {
                setLayoutY(layoutY);
            }
            
            if ((getLayoutX() + (event.getX() - lastX) <= 0)) {
                setLayoutX(0);
            }
        });
        addEventHandler(ZoomEvent.ZOOM_STARTED, (ZoomEvent event) -> {
            startScale = getScaleX();
        });
        addEventHandler(ZoomEvent.ZOOM, (ZoomEvent event) -> {
            setScaleX(startScale * event.getTotalZoomFactor());
            setScaleY(startScale * event.getTotalZoomFactor());
        });
        addEventHandler(RotateEvent.ROTATION_STARTED, (RotateEvent event) -> {
            startRotate = getRotate();
        });
        addEventHandler(RotateEvent.ROTATE, (RotateEvent event) -> {
            setRotate(startRotate + event.getTotalAngle());
        });

    }
}