绘图技术

继承 JPanel

• 画笔
  public void paint(Graphics g){//覆盖父类的方法
  }

import java.awt.Color;
import java.awt.Graphics;
import java.io.*;
import javax.swing.JPanel;
public class Main {
    public static void main(String[] args) throws Exception {
    }
}
class HUIHUA extends JPanel{
    public void paint(Graphics g) {
        System .out .println("paint方法被调用");
        g.drawOval(x, y, width, height);
        g.drawLine(x1, y1, x2, y2);
        g.drawRect(x, y, width, height);
        g.draw3DRect(x, y, width, height, raised);
        g.setColor(Color.BLACK);                 //设置颜色  默认是黑色
        g.fillRect(x, y, width, height); // 填充好的矩形
        g.setFont(font);
    }
}

图片

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Panel;
import java.awt.Toolkit;
import java.io.*;
import javax.swing.JPanel;
public class Main {
    public static void main(String[] args) throws Exception {

    }
}

class HUIHUA extends JPanel{
    public void paint(Graphics g) {
        Image tp =Toolkit.getDefaultToolkit().getImage(Panel.class.getResource("路径"));
        //图片路径放在src
        g.drawImage(tp, dx1, dy1, dx2, dy2, sx1, sy1, sx2, sy2, observer);
    }
}

绘制文字

class HUIHUA extends JPanel{
    public void paint(Graphics g) {
        g.setFont(new Font("宋体",Font.BOLD,15));//设置字体
        g.drawString("内容", x, y);      //内容 位置
    }
}