正确缩放图像的位置Java

Question

我有一张图片详细说明了我想要为Game.height的所有值实现的目标。问题是我在变量circle_dy中的数学表达式似乎是不正确的，因为它缩放了Game.height所有值的图像位置。

 // images of the game
        private Image circle;
    // ball's spawning location 
        private int circle_dx = 0;
        private int circle_dy = (Game.height/2) + 30 ;

    public class GameBoard{ 

    public GameBoard(){

            // construct an ImageIcon specified by the given string directory
        ImageIcon circle = new ImageIcon("src/pics/circle.png");
        // get image type of the ImageIcon and assign it into the image instance                                                  //variable
        this.circle = circle.getImage();


        setBackground(Color.black);


    }

    // appropriate method to paint is paintComponent
        public void paintComponent(Graphics g){
            // if you are overriding a method call the super class paintComponent method
            // because you are creating your own version of the paintComponent method
            super.paintComponent(g);

            // draw the image itself at a particular location on the JPanel


            g.drawImage(this.circle,circle_dx,circle_dy,this);
            }
   }






public class Game extends JFrame{

        public static final int width = 600;
        public static final int height = 200;

    public Game(){
    // add the JPanel to the jframe
    add(new GameBoard());
    setVisible(true);
    // set the size of the jframe
    setSize(width,height);
    }

}

Answer 1

作为建议：

为windows resize编写一个监听器，用于更新球的大小。

要计算所需的大小更改，请抓住窗口的x和y大小（建议每次监听器完成时保存它们）。将％和新值计算为％，然后将球缩放相同的百分比。

供参考：http://docs.oracle.com/javase/tutorial/uiswing/events/componentlistener.html