JavaFX圆弧

弧形

以下代码显示如何绘制以50,50为中心，半径为25并从角度45延伸到角度315(270度长)的圆弧。

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Arc;
import javafx.scene.shape.ArcType;
import javafx.stage.Stage;
public class Main extends Application {
    public static void main(String[] args) {
        Application.launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Text Fonts");
        Group g = new Group();
        Scene scene = new Scene(g, 550, 250,Color.web("0x0000FF",1.0));
        Arc arc = new Arc();
        arc.setCenterX(50.0f);
        arc.setCenterY(50.0f);
        arc.setRadiusX(25.0f);
        arc.setRadiusY(25.0f);
        arc.setStartAngle(45.0f);
        arc.setLength(270.0f);
        arc.setType(ArcType.ROUND);
        g.getChildren().add(arc);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

圆形

Circle类创建一个新的圆，其中指定的半径和中心位置以像素为单位。

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
public class Main extends Application {
    public static void main(String[] args) {
        Application.launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Text Fonts");
        Group root = new Group();
        Scene scene = new Scene(root, 550, 250, Color.web("0x0000FF"));
        Circle circle = new Circle();
        circle.setCenterX(100.0f);
        circle.setCenterY(100.0f);
        circle.setRadius(50.0f);
        root.getChildren().add(circle);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

示例

以下代码显示了如何使用Circle构造函数传递半径和中心。

import java.util.List;
import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
public class Main extends Application {
    public static void main(String[] args) {
        Application.launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("Title");
        final Circle circ = new Circle(40, 40, 30);
        final Group root = new Group(circ);
        final Scene scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

实例-2

圈形与DropShadow，如下代码所示 -

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.Circle;
import javafx.scene.text.Font;
import javafx.scene.text.FontWeight;
import javafx.scene.text.Text;
import javafx.stage.Stage;
public class Main extends Application {
    public static void main(String[] args) {
        Application.launch(args);
    }
    @Override
    public void start(Stage primaryStage) {
        primaryStage.setTitle("");
        Group root = new Group();
        Scene scene = new Scene(root, 300, 250, Color.WHITE);
        Group g = new Group();
        DropShadow ds1 = new DropShadow();
        ds1.setOffsetY(4.0);
        Circle c = new Circle();
        c.setEffect(ds1);
        c.setCenterX(50.0);
        c.setCenterY(125.0);
        c.setRadius(30.0);
        c.setFill(Color.RED);
        c.setCache(true);
        g.getChildren().add(c);
        root.getChildren().add(g);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

getBoundsInParent()方法返回节点的边界区域，例如其宽度和高度。getBoundsInParent()计算包括节点的实际尺寸，高度，宽度，效果，平移和变换。例如，具有阴影效果的形状通过包括阴影增加其宽度。