JavaFX中的刷新率高 [英] High refreshing rate in JavaFX
本文介绍了JavaFX中的刷新率高的处理方法，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
我正在尝试编写一个带有均衡器，频率分析仪和声级计的程序.模型部分似乎工作得很好，但是我正在用IHM尝试一些错误.
I'm trying to write a program with an equalizer, a frequency analyzer and a sound level meter. The model part seems to work very well but I'm experimenting some bugs with the IHM.
我的最后一个错误是与液位计有关.一段时间(从几毫秒到几秒钟)后，它冻结并且不再更新.因此，这是它的(简化)版本.我添加了可运行部分来测试和重现该错误.当然，当我添加也需要非常频繁刷新的其他图形组件时，此错误会较早出现.例如，频率分析用一个带有1000点之类的折线图表示.
My last bug is with the level meter. After a while (from few milliseconds to few seconds), it freezes and don't update anymore. So, here is a (simplified) version of it. I added the runnable part to test and reproduce the bug. Of course, this bug appears sooner when I add other graphical components which also need to refresh very frequently. For example, the frequency analyze is represented by a line-chart with something like 1000 points.
public class LevelMeter2 extends Parent implements Runnable {
private IntegerProperty levelMeterHeight = new SimpleIntegerProperty();
private Rectangle led;
private IntegerProperty height = new SimpleIntegerProperty();
private IntegerProperty width = new SimpleIntegerProperty();
private DoubleProperty linearValue = new SimpleDoubleProperty();
private Color backgroundColor=Color.BLACK;
private double minLinearValue, maxLinearValue;
public LevelMeter2 (int height2, int width2) {
this.height.set(height2);
this.levelMeterHeight.bind(height.multiply(0.9));
this.width.set(width2);
linearValue.set(1.0);
minLinearValue = Math.pow(10, -60.0/100);
maxLinearValue = Math.pow(10, 3.0/100)-minLinearValue;
Rectangle levelMeterShape = new Rectangle();
levelMeterShape.widthProperty().bind(width);
levelMeterShape.heightProperty().bind(height);
levelMeterShape.setStroke(backgroundColor);
this.getChildren().add(levelMeterShape);
led = new Rectangle();
led.widthProperty().bind(width.multiply(0.8));
led.translateXProperty().bind(width.multiply(0.1));
led.heightProperty().bind(levelMeterHeight.multiply(linearValue));
led.setFill(Color.AQUA);
Rotate rotate = new Rotate();
rotate.pivotXProperty().bind(width.multiply(0.8).divide(2));
rotate.pivotYProperty().bind(height.divide(2));
rotate.setAngle(180);
led.getTransforms().add(rotate);
this.getChildren().add(led);
}
public double convertdBToLinearValue (double dB) {
return ((double)Math.round(100 * ((Math.pow(10, dB/100)-minLinearValue)/maxLinearValue)) ) /100 ;
//return (Math.pow(10, dB/100)-minLinearValue)/maxLinearValue;
}
public double convertLinearValueTodB (double linearValue) {
return 100*Math.log10(linearValue*maxLinearValue+minLinearValue);
}
public void setValue (double dB) {
if (dB>3) {
dB=3;
}
linearValue.setValue(convertdBToLinearValue(dB));
}
@Override
public void run() {
int i = 0;
double value=-20;
while (i<1000) {
setValue(value);
value = (Math.random()-0.5)*10+value;
if (value>3) {
value=3;
}
if (value<-60) {
value=-60;
}
i++;
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
System.out.println("END OF WHILE");
}
}
和一个"Main"来测试它:
And a "Main" to test it :
public class MainGraph extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) throws Exception {
HBox pane = new HBox();
LevelMeter2 levelMeter = new LevelMeter2(300,30);
Thread t = new Thread(levelMeter);
pane.getChildren().add(levelMeter);
t.start();
Scene scene = new Scene(pane, 300, 300);
primaryStage.setScene(scene);
primaryStage.setTitle("Test IHM");
primaryStage.setOnCloseRequest( event -> {
System.out.println("FIN");
System.exit(0);
});
primaryStage.show();
}
}
我的代码有什么问题?如何编写更健壮的代码，使我的IHM的刷新率更高?或者如何防止冻结?
What's wrong with my code ? How can I write a more robust code that will allow me high refresh rates of my IHM ? Or how can I prevent from freezing ?
感谢您的帮助.
推荐答案
我建议您远离Threads并使用JavaFX中的某些内容 Timeline .此代码设置为以约60 fps的速度运行.您可以使用Duration.millis()进行调整.
I would suggest you move away from Threads and use something from JavaFX Animation package. In this example Timeline is used. This code is set to run at a rate of about 60 fps. You can adjust that using Duration.millis().
>Main
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class JavaFXApplication342 extends Application
{
@Override
public void start(Stage primaryStage)
{
LevelMeter2 levelMeter = new LevelMeter2(300, 30);
Button button = new Button("Start");
button.setOnAction((event) -> {
switch (button.getText()) {
case "Start":
levelMeter.startAnimation();
button.setText("Stop");
break;
case "Stop":
levelMeter.stopAnimation();
button.setText("Start");
break;
}
});
HBox pane = new HBox(levelMeter, button);
Scene scene = new Scene(pane, 300, 300);
primaryStage.setScene(scene);
primaryStage.setTitle("Test IHM");
primaryStage.setOnCloseRequest(event -> {
System.out.println("FIN");
System.exit(0);
});
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
launch(args);
}
}
LevelMeter2
LevelMeter2
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.Parent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Rotate;
import javafx.util.Duration;
public final class LevelMeter2 extends Parent
{
private final IntegerProperty levelMeterHeight = new SimpleIntegerProperty();
Timeline timeline;
double value = -20;
private final Rectangle led;
private final IntegerProperty height = new SimpleIntegerProperty();
private final IntegerProperty width = new SimpleIntegerProperty();
private final DoubleProperty linearValue = new SimpleDoubleProperty();
private final Color backgroundColor = Color.BLACK;
private final double minLinearValue;
private final double maxLinearValue;
public LevelMeter2(int height2, int width2)
{
this.height.set(height2);
this.levelMeterHeight.bind(height.multiply(0.9));
this.width.set(width2);
linearValue.set(1.0);
minLinearValue = Math.pow(10, -60.0 / 100);
maxLinearValue = Math.pow(10, 3.0 / 100) - minLinearValue;
Rectangle levelMeterShape = new Rectangle();
levelMeterShape.widthProperty().bind(width);
levelMeterShape.heightProperty().bind(height);
levelMeterShape.setStroke(backgroundColor);
this.getChildren().add(levelMeterShape);
led = new Rectangle();
led.widthProperty().bind(width.multiply(0.8));
led.translateXProperty().bind(width.multiply(0.1));
led.heightProperty().bind(levelMeterHeight.multiply(linearValue));
led.setFill(Color.AQUA);
Rotate rotate = new Rotate();
rotate.pivotXProperty().bind(width.multiply(0.8).divide(2));
rotate.pivotYProperty().bind(height.divide(2));
rotate.setAngle(180);
led.getTransforms().add(rotate);
getChildren().add(led);
timeline = new Timeline(new KeyFrame(Duration.millis(16), (event) -> {
setValue(value);
value = (Math.random() - 0.5) * 10 + value;
if (value > 3) {
value = 3;
}
if (value < -60) {
value = -60;
}
}));
timeline.setCycleCount(Timeline.INDEFINITE);
}
public double convertdBToLinearValue(double dB)
{
return ((double) Math.round(100 * ((Math.pow(10, dB / 100) - minLinearValue) / maxLinearValue))) / 100;
}
public double convertLinearValueTodB(double linearValue)
{
return 100 * Math.log10(linearValue * maxLinearValue + minLinearValue);
}
public void setValue(double dB)
{
if (dB > 3) {
dB = 3;
}
linearValue.setValue(convertdBToLinearValue(dB));
}
public void startAnimation()
{
timeline.play();
}
public void stopAnimation()
{
timeline.stop();
}
}
多个LevelMeters示例:
主要
import java.util.ArrayList;
import java.util.List;
import javafx.animation.ParallelTransition;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
/**
*
* @author blj0011
*/
public class JavaFXApplication342 extends Application
{
@Override
public void start(Stage primaryStage)
{
List<LevelMeter2> levelMeter2s = new ArrayList();
List<Timeline> metersTimelines = new ArrayList();
for (int i = 0; i < 9; i++) {
LevelMeter2 levelMeter2 = new LevelMeter2(300, 30);
levelMeter2s.add(levelMeter2);
metersTimelines.add(levelMeter2.getTimeline());
}
ParallelTransition parallelTransition = new ParallelTransition();
parallelTransition.getChildren().addAll(metersTimelines);
Button button = new Button("Start");
button.setOnAction((event) -> {
switch (button.getText()) {
case "Start":
parallelTransition.play();
button.setText("Stop");
break;
case "Stop":
parallelTransition.stop();
button.setText("Start");
break;
}
});
HBox hBox = new HBox();
hBox.getChildren().addAll(levelMeter2s);
VBox vBox = new VBox(hBox, new StackPane(button));
Scene scene = new Scene(vBox, 300, 350);
primaryStage.setScene(scene);
primaryStage.setTitle("Test IHM");
primaryStage.setOnCloseRequest(event -> {
System.out.println("FIN");
System.exit(0);
});
primaryStage.show();
}
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
launch(args);
}
}
LevelMeter2
LevelMeter2
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.scene.Parent;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.transform.Rotate;
import javafx.util.Duration;
public final class LevelMeter2 extends Parent
{
private final IntegerProperty levelMeterHeight = new SimpleIntegerProperty();
Timeline timeline;
double value = -20;
private final Rectangle led;
private final IntegerProperty height = new SimpleIntegerProperty();
private final IntegerProperty width = new SimpleIntegerProperty();
private final DoubleProperty linearValue = new SimpleDoubleProperty();
private final Color backgroundColor = Color.BLACK;
private final double minLinearValue;
private final double maxLinearValue;
public LevelMeter2(int height2, int width2)
{
this.height.set(height2);
this.levelMeterHeight.bind(height.multiply(0.9));
this.width.set(width2);
linearValue.set(1.0);
minLinearValue = Math.pow(10, -60.0 / 100);
maxLinearValue = Math.pow(10, 3.0 / 100) - minLinearValue;
Rectangle levelMeterShape = new Rectangle();
levelMeterShape.widthProperty().bind(width);
levelMeterShape.heightProperty().bind(height);
levelMeterShape.setStroke(backgroundColor);
this.getChildren().add(levelMeterShape);
led = new Rectangle();
led.widthProperty().bind(width.multiply(0.8));
led.translateXProperty().bind(width.multiply(0.1));
led.heightProperty().bind(levelMeterHeight.multiply(linearValue));
led.setFill(Color.AQUA);
Rotate rotate = new Rotate();
rotate.pivotXProperty().bind(width.multiply(0.8).divide(2));
rotate.pivotYProperty().bind(height.divide(2));
rotate.setAngle(180);
led.getTransforms().add(rotate);
getChildren().add(led);
timeline = new Timeline(new KeyFrame(Duration.millis(25), (event) -> {
setValue(value);
value = (Math.random() - 0.5) * 10 + value;
if (value > 3) {
value = 3;
}
if (value < -60) {
value = -60;
}
}));
timeline.setCycleCount(Timeline.INDEFINITE);
}
public double convertdBToLinearValue(double dB)
{
return ((double) Math.round(100 * ((Math.pow(10, dB / 100) - minLinearValue) / maxLinearValue))) / 100;
}
public double convertLinearValueTodB(double linearValue)
{
return 100 * Math.log10(linearValue * maxLinearValue + minLinearValue);
}
public void setValue(double dB)
{
if (dB > 3) {
dB = 3;
}
linearValue.setValue(convertdBToLinearValue(dB));
}
public void startAnimation()
{
timeline.play();
}
public void stopAnimation()
{
timeline.stop();
}
public Timeline getTimeline()
{
return timeline;
}
}
这篇关于JavaFX中的刷新率高的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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