Roma

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.concurrent.ThreadLocalRandom;
class test3 extends JPanel {

    public void paintComponent(Graphics g)
    {
        int randomNum = ThreadLocalRandom.current().nextInt(0, 1000); //рандом точки
        int randomNum2 = ThreadLocalRandom.current().nextInt(0, 1000);
        int randomNum3 = ThreadLocalRandom.current().nextInt(0, 1000);
        int randomNum4 = ThreadLocalRandom.current().nextInt(0, 500); //рандом точки
        int randomNum5 = ThreadLocalRandom.current().nextInt(0, 500);
        int randomNum6 = ThreadLocalRandom.current().nextInt(0, 500);

        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D) g;

        int x1 = randomNum;          //корды прямогуольников
        int y1 = randomNum4;
        int[] xa=new int[]{x1, x1+100, x1+100, x1};
        int[] ya=new int[]{y1, y1, y1+100, y1+100};

        int x2 = randomNum2;
        int y2 = randomNum5;
        int[] xb=new int[]{x2, x2+100, x2+100, x2};
        int[] yb=new int[]{y2, y2, y2+100, y2+100};

        int x3 = randomNum3;
        int y3 = randomNum6;
        int[] xc=new int[]{x3, x3+100, x3+100, x3};
        int[] yc=new int[]{y3, y3, y3+100, y3+100};

        GeneralPath genPath = new GeneralPath();

        genPath.moveTo(xa[0],ya[0]);    //прямоугольник 1
        g2.setPaint(Color.RED);
        g2.drawPolygon(xa,ya,4);
        g2.fillPolygon(xa,ya,4);





        genPath.moveTo(xb[0],yb[0]);        //прямоугольник 2
        g2.setPaint(Color.blue);
        g2.drawPolygon(xb,yb,4);
        g2.fillPolygon(xb,yb,4);




        genPath.moveTo(xc[0],yc[0]);    //прямоугольник 3
        g2.setPaint(Color.GREEN);
        g2.drawPolygon(xc,yc,4);
        g2.fillPolygon(xc,yc,4);






    }

    public static void main(String[] args) {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        test3 gui = new test3();
        gui.setBackground(Color.WHITE);
        frame.add(gui);
        frame.setSize(1280,720);
        frame.setVisible(true);
    }

}



/////////////////////////////////////////////////////////////////////////////////////////////


import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
public class affine extends JPanel {
    public void paintComponent(Graphics g)
    {

        super.paintComponent(g);

        Graphics2D g2 = (Graphics2D) g;

        int x1 = 200;          //корды прямогуольников
        int y1 = 100;
        int[] xa=new int[]{x1, x1+100, x1+100,x1,x1};
        int[] ya=new int[]{y1, y1, y1+100,y1+100,y1};


        GeneralPath genPath = new GeneralPath();

        g2.setPaint(Color.RED);
        for(int i = 0; i < xa.length-1; i++)
        {
            g2.drawLine(xa[i],ya[i],xa[i+1],ya[i+1]);
        }
        g2.fill(genPath);

        AffineTransform affine;

        affine = new AffineTransform(1.0,0.0,0.0,1.0,0.0,0.0);
        affine.translate(100,100);
        affine.scale(1.0,1.0);
        g2.setTransform(affine);
        g2.drawPolygon(xa,ya,4);

        affine = new AffineTransform(1.0,0.0,0.0,1.0,0.0,0.0);
        affine.translate(0,200);
        affine.scale(1.0,1.0);
        g2.setTransform(affine);
        g2.drawPolygon(xa,ya,4);

        affine = new AffineTransform(1.0,0.0,0.0,1.0,0.0,0.0);
        affine.translate(-100,100);
        affine.scale(1.0,1.0);
        g2.setTransform(affine);
        g2.drawPolygon(xa,ya,4);

        affine = new AffineTransform(1.0,0.5,0.4,0.7,120.0,-40.0);
        affine.translate(-100,-100);
        affine.scale(1.0,1.0);
        g2.setTransform(affine);
        g2.drawPolygon(xa,ya,4);

        affine = new AffineTransform(1.0,-0.5,-0.4,0.7,0.0,0.0);
        affine.translate(100,200);
        affine.scale(1.0,1.0);
        g2.setTransform(affine);
        g2.drawPolygon(xa,ya,4);






    }

    public static void main(String[] args) {

        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        affine gui = new affine();
        gui.setBackground(Color.WHITE);
        frame.add(gui);
        frame.setSize(500,300);
        frame.setVisible(true);
    }
}