如何编码高效的背景图像 [英] How to code efficient background image

问题描述

请我用 java 编写一个 2D 游戏，但我的背景图像没有加载 JFrame，因为它可以调整大小

please I am coding a 2D game with java,but my background image does not load up with the JFrame it loads up when I drag the JFrame, since it resizeable

 import javax.swing.*;
 import java.awt.*;
 public class imageLearn1 extends JFrame{
  private Image im;
  private JPanel p1;

  public imageLearn1(){
   this.setSize(300,400);
   this.setVisible(true);
   this.setLocationRelativeTo(null);
   this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   p1=new paintIt();
   this.add(p1);
   }
   class paintIt extends JPanel{
         public paintIt(){
       ImageIcon ima=new ImageIcon("ballfall3.jpg");
       im=ima.getImage();

      im=im.getScaledInstance(200,-1,Image.SCALE_DEFAULT);
      }

     public void paintComponent(Graphics g){
        super.paintComponent(g);
        if(im!=null){
          g.drawImage(im,0,0,300,400,this);
        }
      }
   }


     public static void main(String[]args){
           new imageLearn1();

     }
 }

推荐答案

您必须先将组件添加到框架中，然后才能使框架可见.代码的顺序应该是:

You must add the components to the frame before making the frame visible. The order of the code should be:

p1=new paintIt();
this.add(p1);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(300,400);
this.setLocationRelativeTo(null);
this.setVisible(true);

此外，类名应该以大写字符开头.你的类名应该是PaintIt".

Also, class names should start with an upper case character. You class name should be "PaintIt".

这篇关于如何编码高效的背景图像的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！