how to draw image pixel by piexel in swing-CodePudding

I recently create a program to explore Mandelbrot's fractal and after calculate the image i draw it but with a weird way,how can i paint it in clean way ? The only way i found is to override the paint methode and fill rectangle of 1 pixel.(I know the function to get the color is horrible but it's to make a compact code even if it's useless)

import java.awt.Color;
import javax.swing.JFrame;
public class Mandelbrot{
    public static void main(String[] args) {
        var panel=new javax.swing.JComponent(){
            public void paint(java.awt.Graphics g){
                for (int i = 0; i < 1000000; i  ){
                    g.setColor(function(((i00)/500.0)/zoom x,(i/500000.0)/zoom y,1));
                    g.fillRect(i00,i/1000,1,1);
                }
            }
        };
        panel.addMouseListener(new java.awt.event.MouseAdapter() {
            @Override
            public void mouseClicked(java.awt.event.MouseEvent e) {
                x  = (e.getX() / 1000.0) / zoom;
                y  = (e.getY() / 1000.0) / zoom;
                zoom = e.getButton()==1 ? zoom*2 : (zoom ==1 ? 1:zoom/2);
                panel.repaint();
                System.out.println("zoom : X" zoom);
            }
        });
        panel.setBounds(0,0,1024,1024);
        var frame = new JFrame("FRACTAL");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(1000,1000);
        frame.add(panel);
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
    }
    private static double a,b,temp,x=-1.5,y=-1;
    private static int zoom =1;
    public static Color function(double real,double imag,int accuracy){
        a=0;b=0;
        int max= 1024*accuracy;
        while(max>0&&a*a b*b<4){
            temp=a;
            a=a*a-b*b real;
            b=2*temp*b imag;
            max--;
        }
        max=(1024*accuracy-max)/accuracy;
        return max ==1024 ? Color.BLACK : new Color(max<256 ? 255:(max<512 ? 511-max:0),max<256 ? max: (max<768 ? 255 : 1023-max),max<512 ?0: (max<768 ? max-512:255));
    }
}

CodePudding user response：

You can create a BufferedImage, edit it, and than add it to you frame inside a JLable, like this:

JLabel lable = new JLabel(new ImageIcon(yourBufferedImage));
frame.addLabel();

This will prevent you from re-calculating your image every time you repaint it. To update the image, you should edit your BufferedImage and than update your label icon, like this:

label.setIcon(new ImageIcon(yourBufferedImage));
label.repaint();