debugPlotter

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.stage.Stage;


public class debugPlotter extends Application{

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

    double startX = -5;
    double endX = 5 ;
    double zoomFactor = 1;
    double step = 0.1;
    @SuppressWarnings("unchecked")
    @Override
    public void start(Stage stage) throws Exception {

        final ObservableList<Data<Number, Number>> inData = FXCollections.observableArrayList();

        final Series<Number, Number> series2 = new Series<Number, Number>();
        for (double i = startX ; i < endX ; i+=0.1) {
            inData.add(new Data<Number, Number>(i, Math.sin(i)));
        }
        series2.setData(inData);

        final NumberAxis xAx = new NumberAxis();
        final NumberAxis yAx = new NumberAxis();

        final AreaChart<Number, Number> chart =  new AreaChart<Number,Number>(xAx , yAx);
        chart.getData().addAll(series2);

        chart.setOnKeyPressed(new EventHandler<KeyEvent>() {

            @Override
            public void handle(KeyEvent e) {
                if (e.getCode().equals(KeyCode.UP)){
                    //when pressing up key add new 2 point 1 from left and 1 from right
                    startX -=step;
                    endX +=step;
                    series2.getData().add(0,new Data<Number, Number>(startX, Math.sin(startX)));
                    series2.getData().add(new Data<Number, Number>(endX, Math.sin(endX)));
                }
                else if (e.getCode().equals(KeyCode.DOWN)){
                    //when pressing down key remove new 2 point 1 from left and 1 from right

                    inData.remove(inData.size()-1);

                    inData.remove(0);
                        startX +=step;
                        endX -=step;
                }

            }
        });


        stage = new Stage();
        Group root = new Group(chart);
        Scene scene = new Scene(root);
        stage.setWidth(500);
        stage.setHeight(500);
        stage.setScene(scene);
        stage.show();
        chart.requestFocus();

    }




}