我正在制作需要十字准线的游戏。我一直在玩java.awt.cursor类,这很容易,但是问题是我不希望十字准线能够离开为游戏创建的窗口,所以我尝试了以下方法:

  private void drawCrossHair(Graphics g){
    Ellipse2D ellipse = new Ellipse2D.Float();
    ellipse.setFrame(crossHair.x, crossHair.y, 36, 36);
    Color yellow = new Color (0xEDFF62);
    g.setColor(yellow);
    g.fillOval(crossHair.x, crossHair.y, 40, 40);
    g.setClip(ellipse);
    g.clip(ellipse);

基本上,我试图从“g”中删除“椭圆”,只留下一个小环。这里的问题是“g.clip(ellipse);”给我一个错误。我使用此代码的目的是创建一个圆心,该圆心具有透明的形状,如甜甜圈。创建甜甜圈后,我将在其内部添加一些小点,使其看起来更像十字准线。可能或可能不成问题的一件事是,我计划使用操纵杆而不是鼠标来移动十字准线...我不知道这是否会限制我的十字准线可以用作哪种对象的选择。

编辑:

这是一个SSCCE版本(几乎...由于“g2 = bf.getDrawGraphics()”而无法编译)
package game;

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.image.BufferStrategy;
import javax.swing.JFrame;
import java.awt.geom.Ellipse2D;

public class Game extends JFrame {

    private int windowWidth = 1280;
    private int windowHeight = 1024;
        private Ball crossHair;

    public static void main(String[] args) {
        new Game();
    }
    public Game() {
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(windowWidth, windowHeight);
        this.setResizable(false);
        this.setLocation(0,0);
        this.setVisible(true);
        this.createBufferStrategy(2);
        initGame();
        gameLoop();
    }
    private void initGame() {
            crossHair = new Ball (windowWidth/2, windowHeight/2, 3, 3);
    }

        private void gameLoop() {
            //game logic
            drawFrame();
        }

        private void drawFrame() {

            //Setting up Double Buffering
            BufferStrategy bf = this.getBufferStrategy();
            Graphics2D g2 = (Graphics2D)bf.getDrawGraphics();

            try {
                g2 = bf.getDrawGraphics();
                Color darkBlue = new Color(0x010040);

                g2.setColor(darkBlue);
                g2.fillRect(0, 0, windowWidth, windowHeight);

                drawCrossHair(g2);
            } finally {
                // dispose of graphic.
                g2.dispose();
            }

            // show contents of backbuffer on screen
            bf.show();

            Toolkit.getDefaultToolkit().sync();
        }

        private void drawCrossHair(Graphics2D g2){
            Color yellow = new Color (0xEDFF62);
            g2.setColor(yellow);
            g2.fillOval(crossHair.x, crossHair.y, 40, 40);
            Ellipse2D ellipse = new Ellipse2D.Float();
            ellipse.setFrame(crossHair.x, crossHair.y, 36, 36);
            g2.setClip(ellipse);
            g2.clip(ellipse);
        }
}

这是同一包中的另一个类:

包装游戏;
public class Ball {
    public int x;
    public int y;
    public int dx;
    public int dy;

    public Ball(int x, int y, int dx, int dy) {
        this.x = x;
        this.y = y;
        this.dx = dx;
        this.dy = dy;
    }
}

编辑2:

这是我的最新尝试,似乎可以正常工作...请告诉我这是否编码错误(我有here的想法):
private void drawCrossHair(Graphics g){
    Color yellow = new Color (0xEDFF62);
    g.setColor(yellow);
    for (int i = 0; i < 1; i++) {
    g.drawOval(crosshair.x + i, crosshair.y + i, 40 - i - i, 40 - i - i);
    }
    g.fillArc(crosshair.x + 10, crosshair.y + 21 , 20, 20, -45, -90);
    g.fillArc(crosshair.x - 1, crosshair.y + 10, 20, 20, -135, -90);
    g.fillArc(crosshair.x + 10, crosshair.y - 1, 20, 20, -225, -90);
    g.fillArc(crosshair.x + 21, crosshair.y + 10, 20, 20, -315, -90);
}

最佳答案

但问题是我不想
十字准线能够离开
我为游戏创建的窗口

没有。当鼠标移离框架或组件时,光标将重置。

再次,发布显示问题的SSCCE。

09-25 20:17