RotateTransition围绕一个支点? [英] RotateTransition around a pivot?
问题描述
我使用 RotateTransiton
来旋转一条线,但它似乎在线的中心旋转。我想用枢轴旋转它作为线的一端。怎么做?
I am using RotateTransiton
to rotate a line, but it seems to rotate through center of the line. I would like to rotate it with pivot as one end of the line. How to do this?
推荐答案
RotateTransition
的工作方式是改变< a href =http://docs.oracle.com/javase/8/javafx/api/javafx/scene/Node.html#rotateProperty =nofollow> rotate
属性,正如您所观察到的那样,定义围绕节点
中心的旋转。
The RotateTransition
works by changing the rotate
property, which - as you have observed - defines a rotation around the center of the Node
.
如果要围绕不同的点旋转,请定义 旋转
转换,设置其轴心,将其添加到行的变换列表,并使用时间轴
来操纵它的角度。
If you want to rotate around a different point, define a Rotate
transform, set its pivot, add it to the line's list of transforms, and use a Timeline
to manipulate its angle.
这是一个例子:
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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