ColorGenerator.java

package sample;

import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.RadioButton;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleGroup;
import javafx.scene.layout.HBox;
import javafx.scene.shape.Rectangle;

import java.net.URL;
import java.util.Random;
import java.util.ResourceBundle;

public class Controller implements Initializable {

    ToggleGroup g = new ToggleGroup();

    @FXML private RadioButton rbKuq, rbGjel, rbKaltert, rbGjitha;
    @FXML private HBox hbox, hbox2, hexHbox;

    private Random rand;

    @Override
    public void initialize(URL location, ResourceBundle resources) {
        rbGjel.setToggleGroup(g);
        rbGjitha.setToggleGroup(g);
        rbKaltert.setToggleGroup(g);
        rbKuq.setToggleGroup(g);
        Generate(-1);
    }

    @FXML
    private void generateColor(){
        if (rbKuq.isSelected())
            Generate(0);
        else if (rbGjel.isSelected())
            Generate(1);
        else if (rbKaltert.isSelected())
            Generate(2);
        else Generate(-1);
    }

    private void Generate(int index){
        String rgb;
        rand = new Random();

        int rnd = 0;
        for (int j = 0; j < 4; j++) {
            rgb = "rgb(";
            for (int i = 0; i < 3; i++) {
                if (index == i){
                    rnd = rand.nextInt(256);
                    rgb += ((rnd < 200 || rnd > 254) ? 230 : rnd) + ",";
                }else {
                    rgb += rand.nextInt(200) + ",";
                }
            }

            rgb = rgb.substring(0, rgb.length()-1) + ")";
            String[] s = rgb.substring(4, rgb.length()-1).split(",");
            ((TextField) hbox2.getChildren().get(j)).setText(s[0] + ", " + s[1] + ", " + s[2]);
            ((TextField) hexHbox.getChildren().get(j)).setText(decimalToHex(s[0]) + decimalToHex(s[1]) + decimalToHex(s[2]));

            hbox.getChildren().get(j).setStyle("-fx-fill: " + rgb);
        }
    }

    private String decimalToHex(String in){
        int n = Integer.parseInt(in);
        StringBuilder hex = new StringBuilder("");
        int remainer = 0;

        while (n > 0){
            remainer = n % 16;
            if (remainer == 10) hex.append("A");
            else if (remainer == 11) hex.append("B");
            else if (remainer == 12) hex.append("C");
            else if (remainer == 13) hex.append("D");
            else if (remainer == 14) hex.append("E");
            else if (remainer == 15) hex.append("F");
            else hex.append(remainer);
            n /= 16;
        }
        if (hex.length() == 1) hex.append(0);
        return hex.reverse().toString();
    }
}