package labo6;

import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class ColorAppRevised extends Application {

    public void start(Stage primaryStage) {
        Label lblRed = new Label("Red:");
        Label lblGreen = new Label("Green:");
        Label lblBlue = new Label("Blue:");
        Label lblColour = new Label();

        Slider sldRed = new Slider(0, 255, 0);
        Slider sldGreen = new Slider(0, 255, 0);
        Slider sldBlue = new Slider(0, 255, 0);

        CheckBox chkGray = new CheckBox("Gray");

        sldRed.setShowTickLabels(true);
        sldRed.setShowTickMarks(true);
        sldRed.setMajorTickUnit(100);
        sldRed.setBlockIncrement(25);
        sldRed.setOnMouseDragged(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent event) {
                if (chkGray.isSelected()) {
                    double average = (sldRed.getValue() + sldGreen.getValue() + sldBlue.getValue()) / (3.0 * 255);
                    sldRed.setValue(average*255);
                    sldGreen.setValue(average*255);
                    sldBlue.setValue(average*255);
                }
                lblColour.setBackground(new Background(new BackgroundFill(Color.color(sldRed.getValue() / 255, sldGreen.getValue() / 255, sldBlue.getValue() / 255), CornerRadii.EMPTY, Insets.EMPTY)));
            }
        });

        sldGreen.setShowTickLabels(true);
        sldGreen.setShowTickMarks(true);
        sldGreen.setMajorTickUnit(100);
        sldGreen.setBlockIncrement(25);
        sldGreen.setOnMouseDragged(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent event) {
                if (chkGray.isSelected()) {
                    double average = (sldRed.getValue() + sldGreen.getValue() + sldBlue.getValue()) / (3.0 * 255);
                    sldRed.setValue(average*255);
                    sldGreen.setValue(average*255);
                    sldBlue.setValue(average*255);
                }
                lblColour.setBackground(new Background(new BackgroundFill(Color.color(sldRed.getValue() / 255, sldGreen.getValue() / 255, sldBlue.getValue() / 255), CornerRadii.EMPTY, Insets.EMPTY)));
            }
        });

        sldBlue.setShowTickLabels(true);
        sldBlue.setShowTickMarks(true);
        sldBlue.setMajorTickUnit(100);
        sldBlue.setBlockIncrement(25);
        sldBlue.setOnMouseDragged(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent event) {
                if (chkGray.isSelected()) {
                    double average = (sldRed.getValue() + sldGreen.getValue() + sldBlue.getValue()) / (3.0 * 255);
                    sldRed.setValue(average*255);
                    sldGreen.setValue(average*255);
                    sldBlue.setValue(average*255);
                }
                lblColour.setBackground(new Background(new BackgroundFill(Color.color(sldRed.getValue() / 255, sldGreen.getValue() / 255, sldBlue.getValue() / 255), CornerRadii.EMPTY, Insets.EMPTY)));
            }
        });

        chkGray.setOnMouseClicked(new EventHandler<MouseEvent>() {
            @Override
            public void handle(MouseEvent event) {
                if (chkGray.isSelected()) {
                    double average = (sldRed.getValue() + sldGreen.getValue() + sldBlue.getValue()) / (3.0 * 255);
                    sldRed.setValue(average*255);
                    sldGreen.setValue(average*255);
                    sldBlue.setValue(average*255);
                    lblColour.setBackground(new Background(new BackgroundFill(Color.color(average, average, average), CornerRadii.EMPTY, Insets.EMPTY)));
                }
            }
        });

        lblColour.setBackground(new Background(new BackgroundFill(Color.color(sldRed.getValue() / 255, sldGreen.getValue() / 255, sldBlue.getValue() / 255), CornerRadii.EMPTY, Insets.EMPTY)));
        lblColour.setMinSize(100, 100);

        GridPane root = new GridPane();
        root.setHgap(45);
        root.setVgap(15);
        root.setPadding(new Insets(40, 40, 40, 40));

        root.add(lblRed, 0, 0);
        root.add(lblGreen, 0, 1);
        root.add(lblBlue, 0, 2);
        root.add(sldRed, 1, 0);
        root.add(sldGreen, 1, 1);
        root.add(sldBlue, 1, 2);
        root.add(lblColour, 2, 1);
        root.add(chkGray, 1, 4);

        Scene scene = new Scene(root);

        primaryStage.setTitle("ColorAppRevised");
        primaryStage.setScene(scene);
        primaryStage.setResizable(false);
        primaryStage.show();

    }

    public static void main(String[] args) {
        launch(args);
    }

}