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avaFX Shape类定义了常见的形状，如线，矩形，圆，Arc，CubicCurve，Ellipse和QuadCurve。

在场景图上绘制矩形需要宽度，高度和左上角的（x，y）位置。

要在JavaFX中绘制一个矩形，我们可以使用 javafx.scene.shape.Rectangle 类。

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;public class Main extends Application {public static void main(String[] args) {Application.launch(args);}@Overridepublic void start(Stage primaryStage) {primaryStage.setTitle("");Group root = new Group();Scene scene = new Scene(root, 300, 250, Color.WHITE);Rectangle r = new Rectangle();r.setX(50);r.setY(50);r.setWidth(200);r.setHeight(100);root.getChildren().add(r); primaryStage.setScene(scene);primaryStage.show();}
}

圆角矩形

Rectangle 类实现圆弧宽度和圆弧高度。我们可以使用这些功能来绘制圆角矩形。

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;public class Main extends Application {public static void main(String[] args) {Application.launch(args);}@Overridepublic void start(Stage primaryStage) {Group group = new Group();Rectangle rect = new Rectangle(20,20,200,200);rect.setArcHeight(15);rect.setArcWidth(15);rect.setStroke(Color.BLACK);group.getChildren().add(rect);Scene scene = new Scene(group, 300, 200);primaryStage.setScene(scene);primaryStage.show();}
}

椭圆

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.effect.DropShadow;
import javafx.scene.paint.Color;
import javafx.scene.shape.Ellipse;
import javafx.stage.Stage;public class Main extends Application {public static void main(String[] args) {Application.launch(args);}@Overridepublic void start(Stage primaryStage) {primaryStage.setTitle("");Group root = new Group();Scene scene = new Scene(root, 300, 250, Color.WHITE);Group g = new Group();DropShadow ds = new DropShadow();ds.setOffsetY(3.0);ds.setColor(Color.color(0.4, 0.4, 0.4));Ellipse ellipse = new Ellipse();ellipse.setCenterX(50.0f);ellipse.setCenterY(50.0f);ellipse.setRadiusX(50.0f);ellipse.setRadiusY(25.0f);ellipse.setEffect(ds);g.getChildren().add(ellipse);root.getChildren().add(g);primaryStage.setScene(scene);primaryStage.show();}
}