import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.layout.VBox;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.control.TextField;
import javafx.stage.Stage;
import javafx.scene.paint.Color;

public class Graph2 extends Application {
    private int[] is = {};
    private final Color[] cs = {Color.RED, Color.BLUE};
    private Canvas canvas;

    public void start(Stage stage) {
        stage.setTitle("ƒOƒ‰ƒt");

        TextField input = new TextField("");

        input.setOnAction(e -> {
            String[] args = input.getText().split(" ");
            int n = args.length;
            is = new int[n];

            int i;
            for(i = 0; i < n; i++) {
                is[i] = Integer.parseInt(args[i]);
            }
            paint(canvas.getGraphicsContext2D());
        });

        canvas = new Canvas(200, 200);
        GraphicsContext gc = canvas.getGraphicsContext2D();
        paint(gc);

        VBox root = new VBox();
        root.setAlignment(Pos.CENTER);
        root.getChildren().addAll(input, canvas);
        Scene scene = new Scene(root);
        stage.setScene(scene);
        stage.show();
    }

    private void paint(GraphicsContext gc) {
        gc.clearRect(0, 0, canvas.getWidth(), canvas.getHeight());
        int scale = 15;
        int i, n = is.length;
        for (i = 0; i < n; i++) {
            gc.setFill(cs[i % cs.length]);
            gc.fillRect(0, i * scale, is[i] * scale, scale);
        }
    }

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