Java - 使用方法和构造函数绘制图形

Question

我正在开发 Java 2d 游戏库。我想要一个名为 paintImage() 的方法在每次调用 paintImage() 时执行 graphics.drawImage()。

public void paintImage(image1, x, y){        
    //i want it to run graphics.drawImage every time it is called.        
}

public void anotherMethod(){        
    paintImage(...);
    paintImage(...);
    //paint as many times as i want.        
}

public void paintComponent(Graphics graphics){
    graphics.drawImage();
    super.paintComponents();
} 

感谢您的宝贵时间，请提出建议，抱歉，这很难解释。

Answer 1

对于单图显示

public class DrawingDemo {    
    private JPanel panel;
    private MyImage imageData;

    public DrawingDemo() {
        ...            
        panel = new JPanel() {
            @Override
            public void paintComponent(Graphics g) {
                super.paintComponent(g);
                if (imageData != null) {
                    g.drawImage(imageData.getImage(), imageData.getX(), imageData.getY(), this);
                }

            }
        };
        ...
    }

    public void paintImage(Image image1, int x, int y) {
        imageData = new MyImage(image1, x, y);
        panel.repaint();
    }

    public void anotherMethod() {
        paintImage(...);
        paintImage(...);
    }
}

public class MyImage {    // bean class for storing image information
    private Image image;
    private int x;
    private int y;

    public MyImage(Image image, int x, int y) {
        this.image = image;
        this.x = x;
        this.y = y;
    }

    public Image getImage(){
        return image;
    }

    public int getX(){
        return x;
    }

    public int getY(){
        return y;
    }
    ... you can add setter methods
}

更新:用于多图显示

    private JPanel panel;
    private ArrayList<MyImage> imageData; // or any other data structure you like

    public DrawingDemo() {
        imageData = new ArrayList<>();
        JFrame frame = new JFrame();
        frame.setSize(800, 600);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        panel = new JPanel() {

            @Override
            public void paintComponent(Graphics g) {
                super.paintComponent(g);
                for (MyImage myImage : imageData) {
                    g.drawImage(myImage.getImage(), myImage.getX(), myImage.getY(), this);
                }
            }
        };
        frame.add(panel);
        frame.setVisible(true);

    }

    public void paintImage(Image image1, int x, int y) {
        imageData.add(new MyImage(image1, x, y));
        panel.repaint();
    }

    public void anotherMethod() {
        paintImage(new ImageIcon("/home/blackadmin/Desktop/image.jpg").getImage(), 0, 0);
        paintImage(new ImageIcon("/home/blackadmin/Desktop/image2.jpg").getImage(), 50, 50);
        paintImage(new ImageIcon("/home/blackadmin/Desktop/image3.jpg").getImage(), 100, 100);
    }

输出: 看看这个answer
有不明白的可以留言，希望对你有帮助