JavaFX LineChart:在图表中间插入新数据 [英] JavaFX LineChart: Insert new data in the middle of the chart
问题描述
我使用带有JavaFX的折线图:
LineChart< Number,Number& lineChart = new LineChart<>(xAxis,yAxis);
XYChart.Series series = new XYChart.Series();
lineChart.getData()。add(series);
我想连续添加数据到序列,因此值到达的顺序不能预料到的。例如,索引可以在0和系列的当前大小之间。
series.getData()。add XYChart.Data(index,value));考虑下面的情况:
<$ p $ <$ p <$ p // initializing ...
series.getData()。add(new XYChart.Data(1,400));
series.getData()。add(new XYChart.Data(3,500));
series.getData()。add(new XYChart.Data(8,100));
series.getData()。add(new XYChart.Data(12,120));
series.getData()。add(new XYChart.Data(20,300));
//以后...
series.getData()。add(new XYChart.Data(2,450));
series.getData()。add(new XYChart.Data(5,300));
series.getData()。add(new XYChart.Data(15,200));
问题是如何描绘图形。在上面的例子中,在索引20处,图形循环回到索引2.它看起来像这样:
但我想它看起来像这样:
需要什么设置才能正确更新图形,
解决方案对于JavaFX 9,这个问题有一个新的答案。
有JDK9,请尝试
lineChart.setAxisSortingPolicy(LineChart.SortingPolicy.X_AXIS);
(这是JavaFX 9的默认设置)
如果您想要按照添加的顺序绘制数据,请使用:
lineChart.setAxisSortingPolicy SortingPolicy.NONE);
查看信息:
http://download.java.net/jdk9/jfxdocs/javafx/scene/chart/LineChart.html#axisSortingPolicyProperty
I'm using a line chart with JavaFX:
LineChart<Number, Number> lineChart = new LineChart<>(xAxis, yAxis);
XYChart.Series series = new XYChart.Series();
lineChart.getData().add(series);
I want to add data to the series successively, thereby the order in which the values arrive can not be predicted. For example, the index can be between 0 and the current size of the series.
series.getData().add(new XYChart.Data(index, value));
Consider the following scenario:
//initializing...
series.getData().add(new XYChart.Data(1, 400));
series.getData().add(new XYChart.Data(3, 500));
series.getData().add(new XYChart.Data(8, 100));
series.getData().add(new XYChart.Data(12, 120));
series.getData().add(new XYChart.Data(20, 300));
//later...
series.getData().add(new XYChart.Data(2, 450));
series.getData().add(new XYChart.Data(5, 300));
series.getData().add(new XYChart.Data(15, 200));
The problem is how the graph is depicted. In the example above, at index 20 the graph makes a loop back to index 2. It looks like this:
But I want it to look like this:
What settings are necessary to update the graph properly without additional lines crossing the graph?
解决方案 There is a new answer to this problem with JavaFX 9.
If you have JDK9, try
lineChart.setAxisSortingPolicy(LineChart.SortingPolicy.X_AXIS);
(this is the default setting for JavaFX 9)
If you want for data to be plotted in the order it was added use:
lineChart.setAxisSortingPolicy(LineChart.SortingPolicy.NONE);
See information here:
http://download.java.net/jdk9/jfxdocs/javafx/scene/chart/LineChart.html#axisSortingPolicyProperty
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