java图形变量给出错误值

您好,我想知道是否有人可以帮助我,我已将2个值x1、y1声明为120,并尝试在以下方法中使用它们:

private void drawDot(int x, int y, Graphics2D twoD) {

    twoD.fillOval(x-50, y-50, 100, 100);

}

然而,当我使用drawDot(120120,twoD)时,与手动使用时相比,它在错误的位置绘制填充的椭圆形

twoD.fillOval(70,70,100,100);

这两条语句不应该做完全相同的事情吗?我有什么遗漏吗?我添加了一张图片来展示这个问题,左边的椭圆形是用drawDot方法绘制的椭圆形,右边的椭圆形是在正确位置的椭圆形。如果有人有任何建议,将不胜感激。谢谢

click this link to see how both ovals are drawn

整个班级:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class DieFace extends JPanel {

int x1,y1 = 120;
int x2,y2 = 300;
int x3,y3 = 480;

private BufferedImage bufferedImage;

public DieFace() {

    this.init();
    this.frameInit();       
    updateVal(1);

}

private void init() {

    this.setPreferredSize(new Dimension(600,600));

}


private void frameInit() {

    JFrame window = new JFrame("Dice Simulation");
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setContentPane(this);
    window.pack();
    window.setVisible(true);
    window.setLocationRelativeTo(null);

}

public void paintComponent(Graphics g) {

    Graphics2D twoD = (Graphics2D) g;
    twoD.drawImage(bufferedImage,0,0,null);

}

private void drawDot(int x, int y, Graphics2D twoD) {

    twoD.fillOval(x-50, y-50, 100, 100);

}

public void updateVal(int dieRoll) {

    bufferedImage = new BufferedImage(600,600,BufferedImage.TYPE_INT_ARGB);
    Graphics2D twoD = bufferedImage.createGraphics();
    twoD.setColor(Color.WHITE);
    twoD.fillRect(0, 0, 600, 600);
    twoD.setColor(Color.BLACK);

    if(dieRoll==1) {

        drawDot(x1,y1,twoD);
        twoD.fillOval(70, 70, 100, 100);

    }

    repaint();

}

}