折线图实时更新 [英] Line Chart Live update
本文介绍了折线图实时更新的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
实时更新折线图
我想修改这个简单的折线图示例并添加实时更新。
I want to modify this simple example of Line Chart and add live update.
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class LineChartSample extends Application {
@Override public void start(Stage stage) {
stage.setTitle("Line Chart Sample");
//defining the axes
final NumberAxis xAxis = new NumberAxis();
final NumberAxis yAxis = new NumberAxis();
xAxis.setLabel("Number of Month");
//creating the chart
final LineChart<Number,Number> lineChart =
new LineChart<Number,Number>(xAxis,yAxis);
lineChart.setTitle("Stock Monitoring, 2010");
//defining a series
XYChart.Series series = new XYChart.Series();
series.setName("My portfolio");
//populating the series with data
series.getData().add(new XYChart.Data(1, 23));
series.getData().add(new XYChart.Data(2, 14));
series.getData().add(new XYChart.Data(3, 15));
series.getData().add(new XYChart.Data(4, 24));
series.getData().add(new XYChart.Data(5, 34));
series.getData().add(new XYChart.Data(6, 36));
series.getData().add(new XYChart.Data(7, 22));
series.getData().add(new XYChart.Data(8, 45));
series.getData().add(new XYChart.Data(9, 43));
series.getData().add(new XYChart.Data(10, 17));
series.getData().add(new XYChart.Data(11, 29));
series.getData().add(new XYChart.Data(12, 25));
Scene scene = new Scene(lineChart,800,600);
lineChart.getData().add(series);
stage.setScene(scene);
stage.show();
}
public static void main(String[] args) {
launch(args);
}
}
例如我想得到这个结果：
For example I want to get this result:
http： //dev.sencha.com/deploy/ChartsDemo/examples/chart/Live%20Animated.html
如何修改折线图以获取同样的结果？是否已经有例子？
How I can modify the Line chart to get the same result? Is there already made example?
PS我测试了这个例子来为折线图设置动画
P.S I tested this example to animate the Line Chart
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
public class MainApp extends Application {
private static final int MAX_DATA_POINTS = 50;
private int xSeriesData = 0;
private XYChart.Series series1;
private XYChart.Series series2;
private XYChart.Series series3;
private ExecutorService executor;
private AddToQueue addToQueue;
private ConcurrentLinkedQueue<Number> dataQ1 = new ConcurrentLinkedQueue<Number>();
private ConcurrentLinkedQueue<Number> dataQ2 = new ConcurrentLinkedQueue<Number>();
private ConcurrentLinkedQueue<Number> dataQ3 = new ConcurrentLinkedQueue<Number>();
private NumberAxis xAxis = new NumberAxis();
final NumberAxis yAxis = new NumberAxis();
final LineChart<Number,Number> lineChart =
new LineChart<Number,Number>(xAxis,yAxis);
private void init(Stage primaryStage) {
xAxis = new NumberAxis(0,MAX_DATA_POINTS,MAX_DATA_POINTS/10);
xAxis.setForceZeroInRange(false);
xAxis.setAutoRanging(false);
xAxis.setTickLabelsVisible(false);
xAxis.setTickMarkVisible(false);
xAxis.setMinorTickVisible(false);
NumberAxis yAxis = new NumberAxis();
yAxis.setAutoRanging(true);
//-- Chart
final LineChart<Number, Number> sc = new LineChart<Number, Number>(xAxis, yAxis) {
// Override to remove symbols on each data point
@Override protected void dataItemAdded(Series<Number, Number> series, int itemIndex, Data<Number, Number> item) {}
};
sc.setAnimated(false);
sc.setId("liveLineeChart");
sc.setTitle("Animated Line Chart");
//-- Chart Series
series1 = new XYChart.Series<Number, Number>();
series2 = new XYChart.Series<Number, Number>();
series3 = new XYChart.Series<Number, Number>();
lineChart.getData().addAll(series1, series2, series3);
series1.setName("Test 1");
series2.setName("Test 2");
series3.setName("Test 3");
primaryStage.setScene(new Scene(lineChart));
}
@Override public void start(Stage stage) {
stage.setTitle("Animated Line Chart Sample");
init(stage);
stage.show();
executor = Executors.newCachedThreadPool(new ThreadFactory() {
@Override public Thread newThread(Runnable r) {
Thread thread = new Thread(r);
thread.setDaemon(true);
return thread;
}
});
addToQueue = new AddToQueue();
executor.execute(addToQueue);
//-- Prepare Timeline
prepareTimeline();
}
private class AddToQueue implements Runnable {
@Override
public void run() {
try {
// add a item of random data to queue
dataQ1.add(Math.random());
dataQ2.add(Math.random());
dataQ3.add(Math.random());
Thread.sleep(1000);
executor.execute(this);
} catch (InterruptedException ex) {
Logger.getLogger(MainApp.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
//-- Timeline gets called in the JavaFX Main thread
private void prepareTimeline() {
// Every frame to take any data from queue and add to chart
new AnimationTimer() {
@Override public void handle(long now) {
addDataToSeries();
}
}.start();
}
private void addDataToSeries() {
for (int i = 0; i < 20; i++) { //-- add 20 numbers to the plot+
if (dataQ1.isEmpty()) break;
series1.getData().add(new AreaChart.Data(xSeriesData++, dataQ1.remove()));
series2.getData().add(new AreaChart.Data(xSeriesData++, dataQ2.remove()));
series3.getData().add(new AreaChart.Data(xSeriesData++, dataQ3.remove()));
}
// remove points to keep us at no more than MAX_DATA_POINTS
if (series1.getData().size() > MAX_DATA_POINTS) {
series1.getData().remove(0, series1.getData().size() - MAX_DATA_POINTS);
}
if (series2.getData().size() > MAX_DATA_POINTS) {
series2.getData().remove(0, series2.getData().size() - MAX_DATA_POINTS);
}
if (series3.getData().size() > MAX_DATA_POINTS) {
series3.getData().remove(0, series3.getData().size() - MAX_DATA_POINTS);
}
// update
xAxis.setLowerBound(xSeriesData-MAX_DATA_POINTS);
xAxis.setUpperBound(xSeriesData-1);
}
public static void main(String[] args) {
launch(args);
}
}
代码无法正常工作，因为只有新值是添加。旧值不会被销毁。
The code it's not working properly because only new value are added. Old values are not destroyed.
推荐答案
基于 AnimatedAreaChart 的jewelsea> JewelSea 示例，我修改了它基于LineGraph为你做一个类似的例子。请看一下这个例子，希望它能满足你的需求！
Based on JewelSea's example on AnimatedAreaChart, I modified it to make a similar example for you based on LineGraph. Please have a look at the example, hope it satisfies your need!
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart;
import javafx.stage.Stage;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
public class AnimatedLineChart extends Application {
private static final int MAX_DATA_POINTS = 50;
private int xSeriesData = 0;
private XYChart.Series<Number, Number> series1 = new XYChart.Series<>();
private XYChart.Series<Number, Number> series2 = new XYChart.Series<>();
private XYChart.Series<Number, Number> series3 = new XYChart.Series<>();
private ExecutorService executor;
private ConcurrentLinkedQueue<Number> dataQ1 = new ConcurrentLinkedQueue<>();
private ConcurrentLinkedQueue<Number> dataQ2 = new ConcurrentLinkedQueue<>();
private ConcurrentLinkedQueue<Number> dataQ3 = new ConcurrentLinkedQueue<>();
private NumberAxis xAxis;
private void init(Stage primaryStage) {
xAxis = new NumberAxis(0, MAX_DATA_POINTS, MAX_DATA_POINTS / 10);
xAxis.setForceZeroInRange(false);
xAxis.setAutoRanging(false);
xAxis.setTickLabelsVisible(false);
xAxis.setTickMarkVisible(false);
xAxis.setMinorTickVisible(false);
NumberAxis yAxis = new NumberAxis();
// Create a LineChart
final LineChart<Number, Number> lineChart = new LineChart<Number, Number>(xAxis, yAxis) {
// Override to remove symbols on each data point
@Override
protected void dataItemAdded(Series<Number, Number> series, int itemIndex, Data<Number, Number> item) {
}
};
lineChart.setAnimated(false);
lineChart.setTitle("Animated Line Chart");
lineChart.setHorizontalGridLinesVisible(true);
// Set Name for Series
series1.setName("Series 1");
series2.setName("Series 2");
series3.setName("Series 3");
// Add Chart Series
lineChart.getData().addAll(series1, series2, series3);
primaryStage.setScene(new Scene(lineChart));
}
@Override
public void start(Stage stage) {
stage.setTitle("Animated Line Chart Sample");
init(stage);
stage.show();
executor = Executors.newCachedThreadPool(new ThreadFactory() {
@Override
public Thread newThread(Runnable r) {
Thread thread = new Thread(r);
thread.setDaemon(true);
return thread;
}
});
AddToQueue addToQueue = new AddToQueue();
executor.execute(addToQueue);
//-- Prepare Timeline
prepareTimeline();
}
private class AddToQueue implements Runnable {
public void run() {
try {
// add a item of random data to queue
dataQ1.add(Math.random());
dataQ2.add(Math.random());
dataQ3.add(Math.random());
Thread.sleep(500);
executor.execute(this);
} catch (InterruptedException ex) {
ex.printStackTrace();
}
}
}
//-- Timeline gets called in the JavaFX Main thread
private void prepareTimeline() {
// Every frame to take any data from queue and add to chart
new AnimationTimer() {
@Override
public void handle(long now) {
addDataToSeries();
}
}.start();
}
private void addDataToSeries() {
for (int i = 0; i < 20; i++) { //-- add 20 numbers to the plot+
if (dataQ1.isEmpty()) break;
series1.getData().add(new XYChart.Data<>(xSeriesData++, dataQ1.remove()));
series2.getData().add(new XYChart.Data<>(xSeriesData++, dataQ2.remove()));
series3.getData().add(new XYChart.Data<>(xSeriesData++, dataQ3.remove()));
}
// remove points to keep us at no more than MAX_DATA_POINTS
if (series1.getData().size() > MAX_DATA_POINTS) {
series1.getData().remove(0, series1.getData().size() - MAX_DATA_POINTS);
}
if (series2.getData().size() > MAX_DATA_POINTS) {
series2.getData().remove(0, series2.getData().size() - MAX_DATA_POINTS);
}
if (series3.getData().size() > MAX_DATA_POINTS) {
series3.getData().remove(0, series3.getData().size() - MAX_DATA_POINTS);
}
// update
xAxis.setLowerBound(xSeriesData - MAX_DATA_POINTS);
xAxis.setUpperBound(xSeriesData - 1);
}
public static void main(String[] args) {
launch(args);
}
}
NB 我没有'注意更新X轴上的值，你可以这样做！
N.B. I haven't taken care of updating the values on the X-axis, you can do that !
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