Rotate the broadcast around the rod?
2 answers
RotateTransition
works by changing the property rotate
that you notice determines the rotation around the center Node
.
If you want to rotate around a different point, define a rotate
transform , set its pivot element, add it to the transform list line and use it Timeline
to control your angle.
Here's an example:
import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.shape.Line;
import javafx.scene.transform.Rotate;
import javafx.stage.Stage;
import javafx.util.Duration;
public class RotateLineAboutEnd extends Application {
@Override
public void start(Stage primaryStage) {
Line line = new Line(200, 200, 200, 350);
Pane pane = new Pane(line);
Rotate rotation = new Rotate();
rotation.pivotXProperty().bind(line.startXProperty());
rotation.pivotYProperty().bind(line.startYProperty());
line.getTransforms().add(rotation);
Timeline timeline = new Timeline(
new KeyFrame(Duration.ZERO, new KeyValue(rotation.angleProperty(), 0)),
new KeyFrame(Duration.seconds(1), new KeyValue(rotation.angleProperty(), 360)));
Button button = new Button("Rotate");
button.setOnAction(evt -> timeline.play());
button.disableProperty().bind(timeline.statusProperty().isEqualTo(Animation.Status.RUNNING));
HBox controls = new HBox(button);
controls.setAlignment(Pos.CENTER);
controls.setPadding(new Insets(12));
BorderPane root = new BorderPane(pane, null, null, controls, null);
Scene scene = new Scene(root, 400, 400);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
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(on JavaFX 2.2 and JavaFX 8) The best way, in my opinion, is to cast the layoutBounds from the node (which contains the pivot) and translate the node by itself.
Example:
public class Main extends Application {
@Override
public void start(Stage primaryStage) throws Exception {
Group root = new Group();
primaryStage.setScene(new Scene(root, 140, 140));
Rectangle rect = new Rectangle(1, 1, 40, 40);
// comment movePivot to get the default rotation
movePivot(rect, -20, -20);
RotateTransition rt = new RotateTransition(Duration.seconds(4),rect);
rt.setToAngle(720);
rt.setCycleCount(Timeline.INDEFINITE);
rt.setAutoReverse(true);
rt.play();
primaryStage.show();
}
// this is the function you want
private void movePivot(Node node, double x, double y){
node.getTransforms().add(new Translate(-x,-y));
node.setTranslateX(x); node.setTranslateY(y);
}
public static void main(String[] args) {
launch(args);
}
}
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