将圆形更改为正方形以填充 JavaFX 中的正方形

Question

我发现了一个很棒的动画，其中有从 circle/ellipse 到正方形的过渡，就在动画结束之前，正方形稍微突出一点，然后自行调整回正确的大小。

来源：https://clementmihailescu.github.io/Pathfinding-Visualizer/#

我尝试重新创建它，但我无法获得从一滴墨水到方形的过渡效果。

package sample;

import javafx.animation.*;
import javafx.application.Application;
import javafx.scene.layout.Pane;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.effect.Lighting;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.text.Text;
import javafx.util.Duration;

public class Main extends Application {

@Override
public void start(Stage primaryStage) throws Exception {
    Pane root = new Pane();
    Rectangle originalRectangle = new Rectangle(100,100);
    originalRectangle.setFill(Color.WHITE);
    originalRectangle.setStroke(Color.BLUE);
    Rectangle substituteRectangle = new Rectangle(25,25,50,50);
    substituteRectangle.setOpacity(0.0);
    substituteRectangle.setFill(Color.TURQUOISE);
    substituteRectangle.setStroke(Color.TURQUOISE);
    Rectangle yellowRectangle = new Rectangle(100,100);
    yellowRectangle.setFill(Color.YELLOW);
    root.getChildren().addAll(originalRectangle,substituteRectangle,yellowRectangle);


    FadeTransition fadeOutTransition = new FadeTransition(Duration.millis(3000),yellowRectangle);    //Make the duration as 1ms to get the instant 
    fadeOutTransition.setFromValue(1.0);
    fadeOutTransition.setToValue(0.0);

    FadeTransition fadeInTransition = new FadeTransition(Duration.millis(1),substituteRectangle);
    fadeInTransition.setFromValue(0.0);
    fadeInTransition.setToValue(0.8);

//To make the square protrute out a bit
    ScaleTransition scaleTransition = new ScaleTransition(Duration.seconds(4),substituteRectangle);
    scaleTransition.setToX(2.1);
    scaleTransition.setToY(2.1);

    ParallelTransition parallelTransition = new ParallelTransition(scaleTransition,fadeInTransition);

    fadeOutTransition.play();
    fadeOutTransition.setOnFinished(e -> {
        parallelTransition.setOnFinished(event -> {
            root.getChildren().removeAll(substituteRectangle,yellowRectangle);
            originalRectangle.setOpacity(1.0);
            originalRectangle.setFill(Color.RED);
        });
        parallelTransition.play();
    });
    Scene scene = new Scene(root,800,600);
    primaryStage.setScene(scene);
    primaryStage.show();
}

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

Answer 1

实现这种动画的最简单方法可能是简单地为圆的半径设置动画并使用 Rectangle 作为剪辑来限制它的大小。 Timeline 也经常提供非常适合替换多个转换的动画。在这种情况下，它允许颜色之间的动画以及 DoubleProperty 的动画，这使它成为简化动画的不错选择：

@Override
public void start(Stage primaryStage) throws Exception {
    Pane root = new Pane();
    Rectangle bounds = new Rectangle(50, 50, 100, 100);
    Circle circle = new Circle(bounds.getX() + 0.5 * bounds.getWidth(), bounds.getY() + 0.5 * bounds.getHeight(),
            0);
    circle.setClip(bounds);
    root.getChildren().add(circle);

    Timeline animation = new Timeline(
            new KeyFrame(Duration.ZERO, new KeyValue(circle.fillProperty(), Color.BLUE),
                    new KeyValue(circle.radiusProperty(), 0d)),
            new KeyFrame(Duration.seconds(5), new KeyValue(circle.fillProperty(), Color.RED), new KeyValue(
                    circle.radiusProperty(), 0.5 * Math.hypot(bounds.getWidth(), bounds.getHeight())))); // at the end of the animation the circle should reach the corners -> diameter = diagonale of rect

    root.setOnMouseClicked(evt -> animation.playFromStart());

    Scene scene = new Scene(root, 800, 600);
    primaryStage.setScene(scene);
    primaryStage.show();
}

将圆形更改为正方形以填充 JavaFX 中的正方形

Change a circle to a square to fill a square in JavaFX

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javafx-8