java - 我想在满足条件时更改 PaintComponent() 对象的颜色

Question

我似乎无法理解这一点，我知道涉及到 repaint() 但不知道如何使用它。这是我的代码

public CarPanel()
    {
        repaint();
        rects = new Rectangle[]
        {
            new Rectangle(25, 35, 30, 80, Color.GREEN,"8"),
            new Rectangle(65, 35, 30, 80, Color.GREEN,"7"),
            new Rectangle(105, 35, 30, 80, Color.GREEN,"6"),
            new Rectangle(145, 65, 30, 50, Color.GREEN,"2"),
            new Rectangle(185, 65, 30, 50, Color.green,"1"),
            new Rectangle(25, 170, 30, 50, Color.GREEN,"13"),
            new Rectangle(65, 170, 30, 50, Color.GREEN,"12"),
            new Rectangle(105, 170, 30, 50, Color.GREEN,"11"),
            new Rectangle(145, 170, 30, 50, Color.GREEN,"3"),
            new Rectangle(190, 160, 92, 80, Color.BLACK,"Attendant Station"),
            new Rectangle(25, 280, 30, 50, Color.GREEN,"15"),
            new Rectangle(65, 280, 30, 50, Color.GREEN,"14"),
            new Rectangle(105, 280, 30, 80, Color.GREEN,"10"),
            new Rectangle(145, 280, 30, 80, Color.GREEN,"9"),
            new Rectangle(185, 280, 30, 50, Color.GREEN,"5"),
            new Rectangle(225, 280, 30, 50, Color.GREEN,"4")     
        };
    }//end carPark

    public void changeShapeColor(){

    }

    @Override
    public void paintComponent(Graphics g){
        super.paintComponent(g);
        this.setBackground(Color.white);

        for (Rectangle rect : rects) {               
            g.setColor(Color.BLACK);
            g.drawString(rect.number, rect.x, rect.y);
            g.setColor(rect.color); 
            g.fillRect(rect.x, rect.y, rect.w, rect.h);
        }//end for
    }//end paintComponent
}//end JPanel

当代码中其他地方满足条件时，我想将颜色从绿色更改为红色。非常感谢任何帮助:)

Answer 1

public void changeShapeColor(Color newColor) {
    for (Rectangle rect : rects) {
        rect.color = newColor;
    }
}

然后在条件发生更改时调用 changeShapeColor 方法。并确保您的组件已失效，因此它将被重绘。