用java绘制一个可以转动的转盘，需要颜色不同，转盘里面包含了各种吃的，转动转盘可以选择不同吃的，任意点击转盘转动转盘

发布于 2024-12-07 23:42:20

以下将提供一个Java Swing程序示例，来创建一个包含各种食物项目的旋转转盘。用户可以通过点击转盘来随机旋转到不同的位置。

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;

public class SpinFoodWheel extends JFrame {
    private final int circleRadius = 200; // 圆的半径
    private final List<String> foods = new ArrayList<>();
    private final float angleStep = (float) Math.toRadians(360.0 / NUMBER_OF_SECTIONS); // 分隔角度
    private double currentAngle = 0; // 当前指针角度

    public SpinFoodWheel() {
        setTitle("美味食品旋转盘");
        setSize(400, 400);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new BorderLayout());

        // 添加转盘画板组件
        add(new FoodPanel());
        setLocationRelativeTo(null); // 居中显示
        setVisible(true);
    }

    // 自定义画板以绘制转盘和食物
    private class FoodPanel extends JPanel {
        public FoodPanel() {
            setPreferredSize(new Dimension(circleRadius * 2, circleRadius * 2));
            addMouseListener(new MouseAdapter() {
                @Override
                public void mouseClicked(MouseEvent e) {
                    spinWheel();
                }
            });
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            drawWheel(g);
        }

        private void drawWheel(Graphics g) {
            int numFoods = generateFoods();
            if (numFoods < 1) return;

            int centerX = getWidth() / 2;
            int centerY = getHeight() / 2;
            int numSections = foods.size();

            Graphics2D g2d = (Graphics2D) g;
            g2d.translate(centerX, centerY);

            // 绘制颜色区块、文字和指针
            for (int i = 0; i < numSections; i++) {
                double angleRad = Math.toRadians(currentAngle + i * 360.0 / numSections);

                g2d.setPaintgetColor(.hsbToRgb((float)(i * 1.0 / numSections), 1, 1)); // 根据HSL模型随机颜色
                g2d.fillArc(-circleRadius / 2, -circleRadius / 2, circleRadius, circleRadius, 360 * i / numSections, 360 / numSections);

                // 计算文本的位置并绘制食物名称
                String text = foods.get(i % numFoods);
                FontMetrics fm = g.getFontMetrics();
                int textWidth = fm.stringWidth(text);
                int x = (int) (circleRadius * 0.8 * Math.cos(angleRad));
                int y = (int) (circleRadius * 0.8 * Math.sin(angleRad)) - (int) (fm.getHeight() * 0.4);
                g.drawString(text, x - textWidth / 2, y + fm.getAscent() / 2);

                if(i == numSections - 1){
                    drawCenterPointer();
                }
            }
            g2d.translate(-centerX, -centerY);
        }

        private int generateFoods() {
            foods.clear();
            for (int i = 0; i < NUMBER_OF_SECTIONS; i++) {
                foods.add(FOODS[Math.abs(i) % FOODS.length]);
            }
            return NUMBER_OF_SECTIONS;
        }

        private void spinWheel() {
            currentAngle = Math.toRadians(ThreadLocalRandom.current().nextInt(360));
            repaint();
        }

        private void drawCenterPointer() {
            Graphics2D g2d = (Graphics2D) getGraphics();
            g2d.setPaint(Color.BLACK);
            g2d.drawLine(0, 0, 5, 0);
            g2d.rotate(Math.toRadians(270));
            g2d.drawLine(0, 0, 5, 0);
        }

        private Color getColor(float h, float s, float b) {
            return Color.getHSBColor(h, s, b);
        }
    }

    private static final int NUMBER_OF_SECTIONS = 8; // 分区数量
    private static final String[] FOODS = {"炸鸡", "汉堡", "披萨", "寿司", "雪糕", "沙拉"};

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