如何用Java绘制宝马车标

在Java中，你可以使用Swing或JavaFX等图形库来绘制形状并组合成宝马车标的图案。宝马车标通常包括双肾形的格栅和蓝色的四环Logo。下面是一个简单的步骤概述：

1. **导入必要的库**：
导入`javax.swing`或`javafx.scene.shape`，取决于你选择的绘图框架。

2. **创建图形组件**：
- 使用`Rectangle2D`或`Shape`（Swing）创建双肾形，设置合适的宽度、高度和边角。
- 对于四环Logo，可以使用`Circle`绘制四个圆环，并调整它们的位置和大小。

// Swing示例：
import javax.swing.*;
import java.awt.*;

public class BMWLogo extends JPanel {
    private static final int KIDNEY_WIDTH = 50;
    private static final int KIDNEY_HEIGHT = 40;

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        Graphics2D g2d = (Graphics2D) g;
        
        // 双肾形
        Rectangle2D kidney = new Rectangle2D.Double(0, 0, KIDNEY_WIDTH, KIDNEY_HEIGHT);
        g2d.setColor(Color.WHITE); // 格栅颜色
        g2d.fill(kidney);

        // 四环Logo
        g2d.setColor(Color.BLUE); // Logo颜色
        Circle circle1 = new Circle(75, 75, 25);
        Circle circle2 = new Circle(100, 75, 25);
        Circle circle3 = new Circle(125, 75, 25);
        Circle circle4 = new Circle(150, 75, 25);
        g2d.draw(circle1);
        g2d.draw(circle2);
        g2d.draw(circle3);
        g2d.draw(circle4);
    }
}

// JavaFX示例：
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;

public class BMWLogoPane extends Pane {
    private static final double KIDNEY_WIDTH = 100;
    private static final double KIDNEY_HEIGHT = 80;

    public BMWLogoPane() {
        Rectangle kidney = new Rectangle(0, 0, KIDNEY_WIDTH, KIDNEY_HEIGHT);
        kidney.setFill(Color.WHITE);
        getChildren().add(kidney);

        Circle[] circles = {new Circle(50, 50, 20), new Circle(75, 50, 20),
                            new Circle(100, 50, 20), new Circle(125, 50, 20)};
        for (Circle circle : circles) {
            circle.setFill(Color.BLUE);
            getChildren().add(circle);
        }
    }
}

// 运行时显示Logo：
Platform.runLater(() -> {
    Stage stage = new Stage();
    stage.setScene(new Scene(new BMWLogoPane(), 200, 200));
    stage.show();
});