java 五边形雷达图

Java中可以用JavaFX库来绘制五边形雷达图。以下是一个简单的示例代码：

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class RadarChart extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        Group root = new Group();
        Canvas canvas = new Canvas(600, 600);
        root.getChildren().add(canvas);
        Scene scene = new Scene(root, 600, 600, Color.WHITE);

        GraphicsContext gc = canvas.getGraphicsContext2D();
        gc.setStroke(Color.BLACK);
        gc.setLineWidth(1);

        int centerX = 300;
        int centerY = 300;
        int radius = 200;
        int sides = 5;
        double angle = Math.toRadians(360.0 / sides);
        double[] values = {0.8, 0.6, 0.4, 0.2, 0.7};

        // 绘制五边形
        for (int i = 0; i < sides; i++) {
            double x = centerX + radius * Math.sin(i * angle);
            double y = centerY - radius * Math.cos(i * angle);
            gc.strokeLine(centerX, centerY, x, y);
        }
        gc.strokeLine(centerX + radius, centerY, centerX - radius, centerY);

        // 绘制数据区域
        gc.setFill(Color.BLUE);
        gc.setGlobalAlpha(0.5);
        for (int i = 0; i < sides; i++) {
            double x = centerX + values[i] * radius * Math.sin(i * angle);
            double y = centerY - values[i] * radius * Math.cos(i * angle);
            if (i == 0) {
                gc.beginPath();
                gc.moveTo(x, y);
            } else {
                gc.lineTo(x, y);
            }
        }
        gc.closePath();
        gc.fill();

        primaryStage.setTitle("Radar Chart");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

运行结果如下：