1. Возможно, вы захотите перейти на JavaFX 2.1 (предварительная версия для разработчиков).
Вам придется изменить только обработчик impl_setOnMouseWheel на
bgImageView.setOnScroll(new EventHandler<ScrollEvent>() {
@Override
public void handle(ScrollEvent me) {
adjustMagnification(me.getDeltaY()/40);
}
});
2. Чтобы исправить центрирование стекла, вам нужно исправить макет. StackPane Поместите всех детей в центр, который не соотносится с вашей математикой. Используйте Pane вместо:
Pane root = new Pane();
scene = new Scene(root, 900, 700);
3. Затем вы делаете, что ваш glassGroup будет расположен под мышью, и события мыши будут поглощаться им. Поэтому вы должны также добавить следующий вызов к setupGlassGroup:
glassGroup.setMouseTransparent(true);
4. Кроме того, вы можете упростить свои привязки. Вместо переопределения computeValue каждый раз, вы можете использовать удобные методы, как здесь: viewportCenterX.bind(centerX.multiply(factor));. Смотрите обновленный код ниже:
public class MagnifyingGlass extends Application {
private ImageView bgImageView = new ImageView();
private Image image;
private Scene scene;
private DoubleProperty magnification = new SimpleDoubleProperty();
private DoubleProperty GLASS_SIZE = new SimpleDoubleProperty();
private DoubleProperty GLASS_CENTER = new SimpleDoubleProperty();
private DoubleProperty centerX = new SimpleDoubleProperty();
private DoubleProperty centerY = new SimpleDoubleProperty();
private DoubleProperty factor = new SimpleDoubleProperty();
private DoubleProperty viewportCenterX = new SimpleDoubleProperty();
private DoubleProperty viewportCenterY = new SimpleDoubleProperty();
private DoubleProperty viewportSize = new SimpleDoubleProperty();
private ImageView magGlass = new ImageView();
private Group glassGroup = new Group();
private Text desc = new Text();
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
viewportCenterX.bind(centerX.multiply(factor));
viewportCenterY.bind(centerY.multiply(factor));
viewportSize.bind(GLASS_SIZE.multiply(factor).multiply(magnification));
image = new Image(this.getClass().getResourceAsStream("/sample.jpg"));
Pane root = new Pane();
scene = new Scene(root, 900, 700);
setupBgImageView();
setupFactor();
setupGLASS_SIZE();
magnification.setValue(1.5);
setupMagGlass();
setupGlassGroup();
setupDesc();
bgImageView.requestFocus();
primaryStage.setTitle("Magnifying Glass");
primaryStage.setWidth(image.getWidth() / 2);
primaryStage.setHeight(image.getHeight() / 2);
root.getChildren().addAll(bgImageView, glassGroup, desc);
primaryStage.setScene(scene);
primaryStage.show();
}
public void adjustMagnification(final double amount) {
// no bindings is needed here - it's one time operation
double newValue = magnification.get() + amount / 4;
if (newValue < .5) {
newValue = .5;
} else if (newValue > 10) {
newValue = 10;
}
magnification.setValue(newValue);
}
private void setupGLASS_SIZE() {
DoubleBinding db = new DoubleBinding() {
{
super.bind(bgImageView.boundsInLocalProperty());
}
@Override
protected double computeValue() {
return bgImageView.boundsInLocalProperty().get().getWidth() / 4;
}
};
GLASS_SIZE.bind(db);
GLASS_CENTER.bind(GLASS_SIZE.divide(2));
}
private void setupFactor() {
DoubleBinding db = new DoubleBinding() {
{
super.bind(image.heightProperty(), bgImageView.boundsInLocalProperty());
}
@Override
protected double computeValue() {
return image.heightProperty().get() / bgImageView.boundsInLocalProperty().get().getHeight();
}
};
factor.bind(db);
}
private void setupBgImageView() {
bgImageView.setImage(image);
bgImageView.fitWidthProperty().bind(scene.widthProperty());
bgImageView.fitHeightProperty().bind(scene.heightProperty());
// comparing double requires precision
bgImageView.cacheProperty().bind(factor.isNotEqualTo(1.0, 0.05));
bgImageView.setSmooth(true);
bgImageView.setPreserveRatio(true);
bgImageView.setOnMouseMoved(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
centerX.setValue(me.getX());
centerY.setValue(me.getY());
}
});
bgImageView.setOnKeyPressed(new EventHandler<KeyEvent>() {
@Override
public void handle(KeyEvent ke) {
if (ke.getCode() == KeyCode.EQUALS || ke.getCode() == KeyCode.PLUS) {
adjustMagnification(1.0);
} else if (ke.getCode() == KeyCode.MINUS) {
adjustMagnification(-1.0);
}
}
});
bgImageView.setOnScroll(new EventHandler<ScrollEvent>() {
@Override
public void handle(ScrollEvent me) {
adjustMagnification(me.getDeltaY() / 40);
}
});
bgImageView.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent me) {
if (me.getButton() != MouseButton.PRIMARY) {
magGlass.setSmooth(magGlass.isSmooth());
}
bgImageView.requestFocus();
}
});
}
private void setupMagGlass() {
magGlass.setImage(image);
magGlass.setPreserveRatio(true);
magGlass.fitWidthProperty().bind(GLASS_SIZE);
magGlass.fitHeightProperty().bind(GLASS_SIZE);
magGlass.setSmooth(true);
ObjectBinding ob = new ObjectBinding() {
{
super.bind(viewportCenterX, viewportSize, viewportCenterY);
}
@Override
protected Object computeValue() {
return new Rectangle2D(viewportCenterX.get() - viewportSize.get() / 2, (viewportCenterY.get() - viewportSize.get() / 2), viewportSize.get(), viewportSize.get());
}
};
magGlass.viewportProperty().bind(ob);
Circle clip = new Circle();
clip.centerXProperty().bind(GLASS_CENTER);
clip.centerYProperty().bind(GLASS_CENTER);
clip.radiusProperty().bind(GLASS_CENTER.subtract(5));
magGlass.setClip(clip);
}
private void setupGlassGroup() {
glassGroup.translateXProperty().bind(centerX.subtract(GLASS_CENTER));
glassGroup.translateYProperty().bind(centerY.subtract(GLASS_CENTER));
Text text = new Text();
text.xProperty().bind(GLASS_CENTER.multiply(1.5));
text.yProperty().bind(GLASS_SIZE);
text.textProperty().bind(Bindings.concat("x", magnification, " magnification"));
Circle circle = new Circle();
circle.centerXProperty().bind(GLASS_CENTER);
circle.centerYProperty().bind(GLASS_CENTER);
circle.radiusProperty().bind(GLASS_CENTER.subtract(2));
circle.setStroke(Color.GREEN);
circle.setStrokeWidth(3);
circle.setFill(null);
glassGroup.getChildren().addAll(magGlass, text, circle);
DropShadow dropShadow = new DropShadow();
dropShadow.setOffsetY(4);
glassGroup.setEffect(dropShadow);
glassGroup.setMouseTransparent(true);
}
private void setupDesc() {
desc.setX(10);
desc.setY(15);
if (!bgImageView.isFocused()) {
desc.setText("Click image to focus");
} else {
desc.setText("Use the +/- or mouse wheel to zoom. Right-click to make the magnification "
+ "{if (magGlass.smooth) less smooth. else more smooth.}");
}
desc.setFont(new Font(12));
}
}