我想通过鼠标拖动或缩放按钮实现对实时折线图的放大功能（图表将每 50 毫秒移动一次）。我想放大特定区域..但我面临的问题是每次（x，y）坐标值在图表中发生变化时。有什么办法可以放大这个图表？？
JavaFx 示例代码在这里..
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.animation.AnimationTimer;
import javafx.animation.Timeline;
import javafx.application.Application;
import static javafx.application.Application.launch;
import javafx.scene.Scene;
import javafx.scene.chart.LineChart;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.XYChart.Data;
import javafx.scene.chart.XYChart.Series;
import javafx.stage.Stage;
public class MainApp extends Application {
private static final int MAX_DATA_POINTS = 100;
private Series series;
private int xSeriesData = 100;
private ConcurrentLinkedQueue<Number> dataQ = new ConcurrentLinkedQueue<Number>();
private ExecutorService executor;
private AddToQueue addToQueue;
private Timeline timeline2;
private NumberAxis xAxis;
private void init(Stage primaryStage) throws Exception {
xAxis = new NumberAxis(0, MAX_DATA_POINTS, MAX_DATA_POINTS / 100);
xAxis.setForceZeroInRange(false);
xAxis.setAutoRanging(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("liveAreaChart");
sc.setTitle("RealTime Area Chart");
//-- Chart Series
series = new LineChart.Series<Number, Number>();
series.setName("Area Chart Series");
sc.getData().add(series);
primaryStage.setScene(new Scene(sc));
}
@Override
public void start(Stage primaryStage) throws Exception {
init(primaryStage);
primaryStage.show();
executor = Executors.newCachedThreadPool();
addToQueue = new AddToQueue();
executor.execute(addToQueue);
//-- Prepare Timeline
prepareTimeline();
}
public static void main(String[] args) {
launch(args);
}
private class AddToQueue implements Runnable {
public void run() {
try {
dataQ.add(Math.random());
Thread.sleep(50);
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++) {
if (dataQ.isEmpty()) {
break;
}
series.getData().add(new LineChart.Data(xSeriesData++, dataQ.remove()));
}
// remove points to keep us at no more than MAX_DATA_POINTS
if (series.getData().size() > MAX_DATA_POINTS) {
series.getData().remove(0, series.getData().size() - MAX_DATA_POINTS);
}
// update
xAxis.setLowerBound(xSeriesData - MAX_DATA_POINTS);
int m = xSeriesData - MAX_DATA_POINTS;
xAxis.setUpperBound(xSeriesData - 1);
int j = xSeriesData - 1;
}
}
我使用了来自https://github.com/kerner1000/javafx-chart-zooming/blob/master/src/main/java/com/github/javafx/charts/zooming/ZoomManager.java的缩放管理器代码， 但是鼠标释放的功能没有调用。
提前致谢 ：）