javafx/javafx2.samples/ChartAdvancedStockLine/src/chartadvancedstockline/ChartAdvancedStockLine.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package chartadvancedstockline;

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 * A simulated stock line chart.
 *
 * @see javafx.scene.chart.Chart
 * @see javafx.scene.chart.LineChart
 * @see javafx.scene.chart.NumberAxis
 * @see javafx.scene.chart.XYChart
 */
public class ChartAdvancedStockLine extends Application {

    private XYChart.Series<Number,Number> hourDataSeries;
    private XYChart.Series<Number,Number> minuteDataSeries;
    private NumberAxis xAxis;
    private Timeline animation;

    private double hours = 0;
    private double minutes = 0;
    private double timeInHours = 0;
    private double prevY = 10;
    private double y = 10;

    private void init(Stage primaryStage) {
        Group root = new Group();
        primaryStage.setScene(new Scene(root));
        root.getChildren().add(createChart());
        // create timeline to add new data every 60th of second
        animation = new Timeline();
        animation.getKeyFrames().add(new KeyFrame(Duration.millis(1000/60), new EventHandler<ActionEvent>() {
            @Override public void handle(ActionEvent actionEvent) {
                // 6 minutes data per frame
                for(int count=0; count < 6; count++) {
                    nextTime();
                    plotTime();
                }
            }
        }));
        animation.setCycleCount(Animation.INDEFINITE);
    }

    protected LineChart<Number, Number> createChart() {
        xAxis = new NumberAxis(0,24,3);
        final NumberAxis yAxis = new NumberAxis(0,100,10);
        final LineChart<Number,Number> lc = new LineChart<Number,Number>(xAxis,yAxis);
        // setup chart
        lc.setId("lineStockDemo");
        lc.setCreateSymbols(false);
        lc.setAnimated(false);
        lc.setLegendVisible(false);
        lc.setTitle("ACME Company Stock");
        xAxis.setLabel("Time");
        xAxis.setForceZeroInRange(false);
        yAxis.setLabel("Share Price");
        yAxis.setTickLabelFormatter(new NumberAxis.DefaultFormatter(yAxis,"$",null));
        // add starting data
        hourDataSeries = new XYChart.Series<Number,Number>();
        hourDataSeries.setName("Hourly Data");
        minuteDataSeries = new XYChart.Series<Number,Number>();
        minuteDataSeries.setName("Minute Data");
        // create some starting data
        hourDataSeries.getData().add(new XYChart.Data<Number,Number>(timeInHours,prevY));
        minuteDataSeries.getData().add(new XYChart.Data<Number,Number>(timeInHours,prevY));
        for (double m=0; m<(60); m++) {
            nextTime();
            plotTime();
        }
        lc.getData().add(minuteDataSeries);
        lc.getData().add(hourDataSeries);
        return lc;
    }

    private void nextTime() {
        if (minutes == 59) {
            hours ++;
            minutes = 0;
        } else {
            minutes ++;
        }
        timeInHours = hours + ((1d/60d)*minutes);
    }

    private void plotTime() {
        if ((timeInHours % 1) == 0) {
            // change of hour
            double oldY = y;
            y = prevY - 10 + (Math.random()*20);
            prevY = oldY;
            while (y < 10 || y > 90) y = y - 10 + (Math.random()*20);
            hourDataSeries.getData().add(new XYChart.Data<Number, Number>(timeInHours, prevY));
            // after 25hours delete old data
            if (timeInHours > 25) hourDataSeries.getData().remove(0);
            // every hour after 24 move range 1 hour
            if (timeInHours > 24) {
                xAxis.setLowerBound(xAxis.getLowerBound()+1);
                xAxis.setUpperBound(xAxis.getUpperBound()+1);
            }
        }
        double min = (timeInHours % 1);
        double randomPickVariance = Math.random();
        if (randomPickVariance < 0.3) {
            double minY = prevY + ((y-prevY) * min) - 4 + (Math.random()*8);
            minuteDataSeries.getData().add(new XYChart.Data<Number,Number>(timeInHours,minY));
        } else if (randomPickVariance < 0.7) {
            double minY = prevY + ((y-prevY) * min) - 6 + (Math.random()*12);
            minuteDataSeries.getData().add(new XYChart.Data<Number,Number>(timeInHours,minY));
        } else if (randomPickVariance < 0.95) {
            double minY = prevY + ((y-prevY) * min) - 10 + (Math.random()*20);
            minuteDataSeries.getData().add(new XYChart.Data<Number,Number>(timeInHours,minY));
        } else {
            double minY = prevY + ((y-prevY) * min) - 15 + (Math.random()*30);
            minuteDataSeries.getData().add(new XYChart.Data<Number,Number>(timeInHours,minY));
        }
        // after 25hours delete old data
        if (timeInHours > 25) minuteDataSeries.getData().remove(0);
    }

   public void play() {
        animation.play();
    }

    @Override public void stop() {
        animation.pause();
    }    

    @Override public void start(Stage primaryStage) throws Exception {
        init(primaryStage);
        primaryStage.show();
        play();
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX 
     * application. main() serves only as fallback in case the 
     * application can not be launched through deployment artifacts,
     * e.g., in IDEs with limited FX support. NetBeans ignores main().
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}