java/72_2dGraphics at main · PeiHui369/java · GitHub

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<MyFram.java>
import javax.swing.*;
import java.awt.*;

public class MyFram extends JFrame {
    MyFram(){
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(500,500);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }
    public void paint(Graphics g){

        Graphics2D g2D = (Graphics2D)g;

        g2D.drawLine(0,0,500,500);
    }
}

>>The line drawn start from the left top corner (overlapped by bar)

------------
<Main.java>
import javax.swing.*;

public class Main {
    public static void main(String[] args){

        JFrame MyFram = new MyFram();
    }
}


<MyFram.java>
import javax.swing.*;
import java.awt.*;

public class MyFram extends JFrame {
    MyPanel panel;
    MyFram(){
        panel = new MyPanel();
        this.add(panel);
        this.pack();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(500,500);
        this.setLocationRelativeTo(null);
        this.setVisible(true);
    }

}

<MyPanel.java>
import javax.swing.*;
import java.awt.*;

public class MyPanel extends JPanel {
    Image image; //To draw image
    MyPanel(){
        image = new ImageIcon("smiley.png").getImage(); //To draw image
        this.setPreferredSize(new Dimension(500,500));
    }

    public void paint(Graphics g){

        Graphics2D g2D = (Graphics2D)g;
        //To draw Image
        g2D.drawImage(image,0,0,null);//img,x,y,observer


        /*
        g2D.setPaint(Color.blue);
        g2D.setStroke(new BasicStroke(5));
        g2D.drawLine(0,0,500,500); >> A line drawn from (below bar) left top corner to right bottom corner
        g2D.setPaint(Color.pink);//change colour

        g2D.drawRect(0,0,100,200);//x,y,width,height >>A rectangle
        g2D.fillRect(0,0,100,200); //>>Rectangle completely filled with pink colour
        //More recently created overlap with previous created

        //To draw circle
        g2D.setPaint(Color.orange);
        g2D.drawOval(0,0,100,100);
        g2D.fillOval(0,0,100,100);

        g2D.setPaint(Color.red);
        g2D.drawArc(0,0,100,100,0,180); //x, y, width, height, startAngle, arcAngle
        g2D.setPaint(Color.white);
        g2D.fillArc(0,0,100,100,180,180);
        */

        /*
        //To draw TRIANGLE
        int[] xPoints = {150, 250, 350};
        int[]yPoints = {300, 150, 300};
        g2D.drawPolygon(xPoints, yPoints,3);//xPoints, yPoints, nPoints (Takes an array of integers)
        g2D.fillPolygon(xPoints, yPoints, 3);
         */

        /* To create words
        g2D.setPaint(Color.magenta);
        g2D.setFont(new Font("Ink Free",Font.BOLD,50));
        g2D.drawString("U R A WINNER! :D", 50, 50);
        */


    }
}