java 使用二维数组和 JfreeChart 制作散点图
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Making a Scatter Plot Using 2d array and JfreeChart
提问by Zeeshan
This is my First Month with Java, so I apologize for my stupid question in advance. I'm trying to make a simple program using Jfreechart. I want to display my 2D array on the scatter plot. here is the code:
这是我使用 Java 的第一个月，所以我提前为我的愚蠢问题道歉。我正在尝试使用 Jfreechart 制作一个简单的程序。我想在散点图上显示我的二维数组。这是代码：
package myappthatusesjfreechart;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartFrame;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.general.DefaultPieDataset;
public class MyAppThatUsesJFreeChart {
public static void main(String[] args) {
// create a dataset...
int[][] a2 = new int[10][5];
// print array in rectangular form
for (int r = 0; r < a2.length; r++) {
for (int c = 0; c < a2[r].length; c++) {
System.out.print(" " + a2[r][c]);
}
System.out.println("");
}
// create a chart...
JFreeChart chart = ChartFactory.createScatterPlot(
"Scatter Plot", // chart title
"X", // x axis label
"Y", // y axis label
a2, // data ***-----PROBLEM------***
PlotOrientation.VERTICAL,
true, // include legend
true, // tooltips
false // urls
);
// create and display a frame...
ChartFrame frame = new ChartFrame("First", chart);
frame.pack();
frame.setVisible(true);
}
}
The ;ChartFactory.createScatterPlot; is not allowing me to pass the 2d array, I want to ask is there any way that i can do it.
;ChartFactory.createScatterPlot; 不允许我传递二维数组，我想问有什么办法可以做到。
回答by trashgod
The createScatterPlot()method expects an XYDataset, such as XYSeriesCollection. There are examples using XYSeriesCollectionhereand here.
该createScatterPlot()方法需要一个XYDataset，例如XYSeriesCollection。有使用XYSeriesCollectionhere和here的例子。
Addendum: Here's an example more suited to a scatter plot; just replace a2with createDataset()in the factory call.
附录：这是一个更适合散点图的示例；只需在工厂调用中替换a2为createDataset()。
private static final Random r = new Random();
private static XYDataset createDataset() {
XYSeriesCollection result = new XYSeriesCollection();
XYSeries series = new XYSeries("Random");
for (int i = 0; i <= 100; i++) {
double x = r.nextDouble();
double y = r.nextDouble();
series.add(x, y);
}
result.addSeries(series);
return result;
}
