JavaFX 面积图行为已更改
[英]JavaFX area chart behavior changed
问题描述
我有 Swing 应用程序，它的面板包含多个具有自定义样式的 JavaFX AreaCharts（使用 javafx.embed.swing.JFXPanel）。 我们使用了 jre 8u20 和 jre 8u25 并且一切正常，现在我不得不更新到 jre 8u66 并且我的图表看起来不同。
该问题的描述与我的情况相反： How to add negative values to JavaFx Area Chart? . 我已经使用图表系列根据数据为图表的背景着色（例如，我需要为缺少数据的 X 轴间隔为红色背景着色）。 JavaFX 8u20 面积图背景被着色到图表线的下限，更新面积图填充背景后，只对轴忽略轴下方或上方的部分。
现在 JavaFX 面积图的工作方式如文档中所述：
我如何使用 jre 8u66 返回 javaFX 区域图旧行为以获得类似的东西：
编辑：
所以我找到了修复负值背景填充http://hg.openjdk.java.net/openjfx/8u60/rt/rev/a57b8ba039d0?revcount=480的提交。
这只是方法中的几行，我的第一个想法是快速修复：在我自己的类中覆盖这个方法，但是我在这样做时遇到了问题，JavaFX 类对许多必需字段和方法的此类修改不友好是私有的或包私有的 :(
这是我试图改变 AreaChart 行为的类：
public class NegativeBGAreaChart<X,Y> extends AreaChart<X, Y> {
public NegativeBGAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis) {
this(xAxis,yAxis, FXCollections.<Series<X,Y>>observableArrayList());
}
public NegativeBGAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis, @NamedArg("data") ObservableList<Series<X,Y>> data) {
super(xAxis,yAxis, data);
}
@Override
protected void layoutPlotChildren() {
List<LineTo> constructedPath = new ArrayList<>(getDataSize());
for (int seriesIndex=0; seriesIndex < getDataSize(); seriesIndex++) {
Series<X, Y> series = getData().get(seriesIndex);
DoubleProperty seriesYAnimMultiplier = seriesYMultiplierMap.get(series);
double lastX = 0;
final ObservableList<Node> children = ((Group) series.getNode()).getChildren();
ObservableList<PathElement> seriesLine = ((Path) children.get(1)).getElements();
ObservableList<PathElement> fillPath = ((Path) children.get(0)).getElements();
seriesLine.clear();
fillPath.clear();
constructedPath.clear();
for (Iterator<Data<X, Y>> it = getDisplayedDataIterator(series); it.hasNext(); ) {
Data<X, Y> item = it.next();
double x = getXAxis().getDisplayPosition(item.getCurrentX());
double y = getYAxis().getDisplayPosition( getYAxis().toRealValue(getYAxis().toNumericValue(item.getCurrentY()) * seriesYAnimMultiplier.getValue()));
constructedPath.add(new LineTo(x, y));
if (Double.isNaN(x) || Double.isNaN(y)) {
continue;
}
lastX = x;
Node symbol = item.getNode();
if (symbol != null) {
final double w = symbol.prefWidth(-1);
final double h = symbol.prefHeight(-1);
symbol.resizeRelocate(x-(w/2), y-(h/2),w,h);
}
}
if (!constructedPath.isEmpty()) {
Collections.sort(constructedPath, (e1, e2) -> Double.compare(e1.getX(), e2.getX()));
LineTo first = constructedPath.get(0);
final double displayYPos = first.getY();
final double numericYPos = getYAxis().toNumericValue(getYAxis().getValueForDisplay(displayYPos));
// RT-34626: We can't always use getZeroPosition(), as it may be the case
// that the zero position of the y-axis is not visible on the chart. In these
// cases, we need to use the height between the point and the y-axis line.
final double yAxisZeroPos = getYAxis().getZeroPosition();
final boolean isYAxisZeroPosVisible = !Double.isNaN(yAxisZeroPos);
final double yAxisHeight = getYAxis().getHeight();
final double yFillPos = isYAxisZeroPosVisible ? yAxisZeroPos : numericYPos < 0 ? numericYPos - yAxisHeight : yAxisHeight;
seriesLine.add(new MoveTo(first.getX(), displayYPos));
fillPath.add(new MoveTo(first.getX(), yFillPos));
seriesLine.addAll(constructedPath);
fillPath.addAll(constructedPath);
fillPath.add(new LineTo(lastX, yFillPos));
fillPath.add(new ClosePath());
}
}
}
}
问题是：
原始 AreaChart 的字段是私有且无法访问的
private Map, DoubleProperty> seriesYMultiplierMap = new HashMap<>();
一些方法是包私有的，例如
javafx.scene.chart.XYChart.Data.getCurrentX()
javafx.scene.chart.XYChart.Data.getCurrentY()
javafx.scene.chart.XYChart.getDataSize()
1 个解决方案
解决方案1
1 已采纳 2015-11-16 13:11:56
所以尽可能的解决方法我做了这个：
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javafx.beans.NamedArg;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.chart.AreaChart;
import javafx.scene.chart.Axis;
import javafx.scene.shape.ClosePath;
import javafx.scene.shape.LineTo;
import javafx.scene.shape.MoveTo;
import javafx.scene.shape.Path;
import javafx.scene.shape.PathElement;
/**
* AreaChart - Plots the area between the line that connects the data points and
* the 0 line on the Y axis. This implementation Plots the area between the line
* that connects the data points and the bottom of the chart area.
*
* @since JavaFX 2.0
*/
public class NegativeBGAreaChart<X, Y> extends AreaChart<X, Y> {
protected Map<Series<X, Y>, DoubleProperty> shadowSeriesYMultiplierMap = new HashMap<>();
// -------------- CONSTRUCTORS ----------------------------------------------
public NegativeBGAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis) {
this(xAxis, yAxis, FXCollections.<Series<X, Y>> observableArrayList());
}
public NegativeBGAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis, @NamedArg("data") ObservableList<Series<X, Y>> data) {
super(xAxis, yAxis, data);
}
// -------------- METHODS ------------------------------------------------------------------------------------------
@Override
protected void seriesAdded(Series<X, Y> series, int seriesIndex) {
DoubleProperty seriesYAnimMultiplier = new SimpleDoubleProperty(this, "seriesYMultiplier");
shadowSeriesYMultiplierMap.put(series, seriesYAnimMultiplier);
super.seriesAdded(series, seriesIndex);
}
@Override
protected void seriesRemoved(final Series<X, Y> series) {
shadowSeriesYMultiplierMap.remove(series);
super.seriesRemoved(series);
}
@Override
protected void layoutPlotChildren() {
// super.layoutPlotChildren();
try {
List<LineTo> constructedPath = new ArrayList<>(getDataSize());
for (int seriesIndex = 0; seriesIndex < getDataSize(); seriesIndex++) {
Series<X, Y> series = getData().get(seriesIndex);
DoubleProperty seriesYAnimMultiplier = shadowSeriesYMultiplierMap.get(series);
double lastX = 0;
final ObservableList<Node> children = ((Group) series.getNode()).getChildren();
ObservableList<PathElement> seriesLine = ((Path) children.get(1)).getElements();
ObservableList<PathElement> fillPath = ((Path) children.get(0)).getElements();
seriesLine.clear();
fillPath.clear();
constructedPath.clear();
for (Iterator<Data<X, Y>> it = getDisplayedDataIterator(series); it.hasNext();) {
Data<X, Y> item = it.next();
double x = getXAxis().getDisplayPosition(item.getXValue());// FIXME: here should be used item.getCurrentX()
double y = getYAxis().getDisplayPosition(
getYAxis().toRealValue(
getYAxis().toNumericValue(item.getYValue()) * seriesYAnimMultiplier.getValue()));// FIXME: here should be used item.getCurrentY()
constructedPath.add(new LineTo(x, y));
if (Double.isNaN(x) || Double.isNaN(y)) {
continue;
}
lastX = x;
Node symbol = item.getNode();
if (symbol != null) {
final double w = symbol.prefWidth(-1);
final double h = symbol.prefHeight(-1);
symbol.resizeRelocate(x - (w / 2), y - (h / 2), w, h);
}
}
if (!constructedPath.isEmpty()) {
Collections.sort(constructedPath, (e1, e2) -> Double.compare(e1.getX(), e2.getX()));
LineTo first = constructedPath.get(0);
seriesLine.add(new MoveTo(first.getX(), first.getY()));
fillPath.add(new MoveTo(first.getX(), getYAxis().getHeight()));
seriesLine.addAll(constructedPath);
fillPath.addAll(constructedPath);
fillPath.add(new LineTo(lastX, getYAxis().getHeight()));
fillPath.add(new ClosePath());
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Gets the size of the data returning 0 if the data is null
*
* @return The number of items in data, or null if data is null
*/
public int getDataSize() {
final ObservableList<Series<X, Y>> data = getData();
return (data != null) ? data.size() : 0;
}
}
我知道它有问题，但我现在别无选择，我希望有一天 JavaFX 能够对外部变化更加友好。
编辑：
此解决方法正在解决所描述的问题，但似乎由于标记为 FIXME 的代码，系列点出现在错误的坐标上。 在下面的屏幕截图中，该系列的点具有 Y 坐标 3 或 -3，但它们都放置在坐标为 0 的轴上。
编辑2：
所以我设法修复了它，动画有问题，所以我禁用了图表的动画：
chart.setAnimated(false);
并修复了该方法（在第二个 FIXME 行中删除了动画乘数）所以最后我有了这个：
public class NegativeBGAreaChart<X, Y> extends AreaChart<X, Y> {
protected Map<Series<X, Y>, DoubleProperty> shadowSeriesYMultiplierMap = new HashMap<>();
// -------------- CONSTRUCTORS ----------------------------------------------
public NegativeBGAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis) {
this(xAxis, yAxis, FXCollections.<Series<X, Y>> observableArrayList());
}
public NegativeBGAreaChart(@NamedArg("xAxis") Axis<X> xAxis, @NamedArg("yAxis") Axis<Y> yAxis, @NamedArg("data") ObservableList<Series<X, Y>> data) {
super(xAxis, yAxis, data);
}
// -------------- METHODS ------------------------------------------------------------------------------------------
@Override
protected void seriesAdded(Series<X, Y> series, int seriesIndex) {
DoubleProperty seriesYAnimMultiplier = new SimpleDoubleProperty(this, "seriesYMultiplier");
shadowSeriesYMultiplierMap.put(series, seriesYAnimMultiplier);
super.seriesAdded(series, seriesIndex);
}
@Override
protected void seriesRemoved(final Series<X, Y> series) {
shadowSeriesYMultiplierMap.remove(series);
super.seriesRemoved(series);
}
@Override
protected void layoutPlotChildren() {
// super.layoutPlotChildren();
try {
List<LineTo> constructedPath = new ArrayList<>(getDataSize());
for (int seriesIndex = 0; seriesIndex < getDataSize(); seriesIndex++) {
Series<X, Y> series = getData().get(seriesIndex);
DoubleProperty seriesYAnimMultiplier = shadowSeriesYMultiplierMap.get(series);
double lastX = 0;
final ObservableList<Node> children = ((Group) series.getNode()).getChildren();
ObservableList<PathElement> seriesLine = ((Path) children.get(1)).getElements();
ObservableList<PathElement> fillPath = ((Path) children.get(0)).getElements();
seriesLine.clear();
fillPath.clear();
constructedPath.clear();
for (Iterator<Data<X, Y>> it = getDisplayedDataIterator(series); it.hasNext();) {
Data<X, Y> item = it.next();
double x = getXAxis().getDisplayPosition(item.getXValue());// FIXME: here should be used item.getCurrentX()
double y = getYAxis().getDisplayPosition(getYAxis().toRealValue(getYAxis().toNumericValue(item.getYValue())));// FIXME: here should be used item.getCurrentY()
constructedPath.add(new LineTo(x, y));
if (Double.isNaN(x) || Double.isNaN(y)) {
continue;
}
lastX = x;
Node symbol = item.getNode();
if (symbol != null) {
final double w = symbol.prefWidth(-1);
final double h = symbol.prefHeight(-1);
symbol.resizeRelocate(x - (w / 2), y - (h / 2), w, h);
}
}
if (!constructedPath.isEmpty()) {
Collections.sort(constructedPath, (e1, e2) -> Double.compare(e1.getX(), e2.getX()));
LineTo first = constructedPath.get(0);
seriesLine.add(new MoveTo(first.getX(), first.getY()));
fillPath.add(new MoveTo(first.getX(), getYAxis().getHeight()));
seriesLine.addAll(constructedPath);
fillPath.addAll(constructedPath);
fillPath.add(new LineTo(lastX, getYAxis().getHeight()));
fillPath.add(new ClosePath());
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Gets the size of the data returning 0 if the data is null
*
* @return The number of items in data, or null if data is null
*/
public int getDataSize() {
final ObservableList<Series<X, Y>> data = getData();
return (data != null) ? data.size() : 0;
}
}
修复后一切正常（与上一张图片相同的数据集）：
JavaFX：如何反序列化动态创建Area Chart Series？
[英]JavaFX: How to deserialize dynamically create Area Chart Series?
JavaFX：如何在面积图上动态添加服务器系列，并从图表中删除线（系列）？
[英]JavaFX: How to add serveral series dynimically on Area Chart and delete line(series) from chart?
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