//   Zaklady pocitacove grafiky

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.math.*;

public class BasicDraw {
    public static void main(String[] args) {
        new BasicDraw();
    }
    BasicDraw() {
        // Create a frame
        JFrame frame = new JFrame();

        // Add a component with a custom paint method
        frame.getContentPane().add(new MyComponent());

        // Display the frame
        int frameWidth = 300;
        int frameHeight = 300;
        frame.setSize(frameWidth, frameHeight);
        frame.setVisible(true);
        frame.addWindowListener(new WindowAdapter() {
          public void windowClosing(WindowEvent evt) {
              // Exit the application
                  System.exit(0);
              }
          });
    }

    class MyComponent extends JComponent {
        // This method is called whenever the contents needs to be painted
        public void paint(Graphics g) {
            // Draw an oval that fills the window
        	double a=20;
            int Ax = 50,  Ay = 50;
            int Bx = 150, By = 250;

            g.drawLine(Ax,Ay,Bx,By);
            //g.drawLine(-25,66,-167,2);
            double matice[][]=new double[3][3];
            matice[0][0]=Math.cos(a);
            matice[0][1]=-Math.sin(a);
            matice[0][2]=0;
            matice[1][0]=Math.sin(a);
            matice[1][1]=Math.cos(a);
            matice[1][2]=0;
            matice[2][0]=0;
            matice[2][1]=0;
            matice[2][2]=2;

            double poc[]=new double[3];
            poc[0]=50;
            poc[1]=50;
            poc[2]=1;

            double kon[]= new double[3];
            kon[0]=150;
            kon[1]=250;
            kon[2]=1;

            double newpoc[]=new double[3];
            double newkon[]=new double[3];

            for (int i=0;i<=2;i++){
            	for(int j=0;j<=2;j++){
            		newpoc[i] += matice[i][j]*poc[j];
            		newkon[i] += matice[i][j]*kon[j];
            	}
            }

            //g.drawLine((int)newpoc[0], (int)newpoc[1], (int)newkon[0], (int)newkon[1]);
            //System.out.println((int)newkon[2]);


        }
    }
}