datorgrafika ld4

package pakete;

import java.awt.Graphics;
import java.awt.Color;
import static java.lang.Math.pow;
import java.util.Random;

public class ld4 extends javax.swing.JFrame {

    public static int WIDTH;
    public static int HEIGHT;
    private Graphics g;
    int sel;
    private float t;
    private float tStep;


    /**
     * Creates new form ld4
     */
    public ld4() {
        initComponents();
        WIDTH = jPanel1.getWidth();
        HEIGHT = jPanel1.getHeight();
        g = jPanel1.getGraphics();


       // drawPanel();
    }

//private void drawPanel() {
  //
    //    g.setColor(new Color(245, 245, 245));
      //  g.fillRect(0, 0, WIDTH, HEIGHT);
        //g.setColor(new Color(200, 200, 200));
        //g.drawLine(WIDTH / 4, 0, WIDTH / 4, HEIGHT);
        //g.drawLine(WIDTH / 2, 0, WIDTH / 2, HEIGHT);
        //g.drawLine(WIDTH / 4 + WIDTH / 2, 0, WIDTH / 4 + WIDTH / 2, HEIGHT);
        //g.drawLine(0, HEIGHT / 4, WIDTH, HEIGHT / 4);
        //g.drawLine(0, HEIGHT / 2, WIDTH, HEIGHT / 2);
        //g.drawLine(0, HEIGHT / 4 + HEIGHT / 2, WIDTH, HEIGHT / 4 + HEIGHT / 2);
//
  //  }

public int Fact(int n)
{
    if (n == 0)
        return 1;
    else
        return n * Fact(n-1);
}




private void Bezje() {

        int x, y, i;
        tStep = Float.parseFloat(tTextField.getText());
        t = 0;
     ////   drawPanel();


        while (t <= 1) {

                for (int j = 0; j <= sel; j++){
                    P.B[j] = (float) ( ( Fact(sel)/( Fact(j)*Fact(sel-j) )) * (pow((1-t), sel - j)) * (pow(t,j)) );
                    //jTextArea1.append(String.valueOf(P.B[j]) + "\n");
                }
            int xc = 0;
            int yc = 0;
            for (int c = 0; c <=sel; c++){
                xc += P.B[c] * P.x[c];
                yc += P.B[c] * P.y[c];
            }
            x = xc;
            y = yc;

            g.setColor(Color.green);
            g.drawRect(x, y, 1, 1);

            t = (float) (t + tStep);
        }

        for (i = 0; i <= sel; i++) {

            if (i < sel) {
                g.setColor(Color.blue);
                g.drawLine(P.x[i], P.y[i], P.x[i + 1], P.y[i + 1]);
            }
            g.setColor(Color.red);
            g.drawString(String.valueOf(i + 1), P.x[i], ((P.y[i]) - 6));
            g.drawOval(P.x[i], P.y[i], 3, 3);

        }

    }

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
        Random val = new Random();
        sel = jComboBox1.getSelectedIndex() + 2;
        for (int i = 0; i <= sel; i++) {
            P.x[i] = val.nextInt(jPanel1.getWidth());
            P.y[i] = val.nextInt(jPanel1.getHeight());
        }
        Bezje();
    }

    private void jPanel1MousePressed(java.awt.event.MouseEvent evt) {
        int n;
        n = jComboBox2.getSelectedIndex() ;
        int x = evt.getX();
        int y = evt.getY();
        P.x[n] = x;
        P.y[n] = y;
        Bezje();
    }