我正在尝试读取一个.csv文件,但我一直在阅读csv文件中的每一行以及如何将其添加到XYDataset。
我的算法如下:读入.csv文件 - >阅读每一行 - >添加到数据集 - >创建图表 - >输出为框架
data.csv
有4列:Time
,X
,Y
,Z
如何将每个点(时间,x),(时间,y),(时间,z)添加到数据集中?
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import com.opencsv.CSVReader;
public class Test extends ApplicationFrame
{
XYDataset dataset;
JFreeChart chart;
final ChartPanel chartPanel;
final int chartWidth = 560;
final int chartHeight = 367;
CSVReader reader;
String[] readNextLine;
XYSeries series;
public Test(String applicationTitle) throws IOException
{
super(applicationTitle);
dataset = createDataset();
chart = createChart(dataset);
chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(chartHeight, chartWidth));
}
public XYDataset createDataset() throws NumberFormatException, IOException
{
dataset = new XYSeriesCollection();
try
{
reader = new CSVReader(new FileReader("data.csv"));
while((readNextLine = reader.readNext()) != null)
{
if (readNextLine != null)
{
//add values to dataset
}
}
}
catch (FileNotFoundException e)
{
System.out.println("File not found!");
}
return dataset;
}
public JFreeChart createChart(XYDataset dataset) throws NumberFormatException, IOException
{
chart = ChartFactory.createXYLineChart(
"Acceleration vs Time", //chart title
"Time", //domain axis label
"Acceleration", //range axis label
createDataset(), //data
PlotOrientation.VERTICAL, //the plot orientation
true, //legend
true, //tooltips
false); //urls
return chart;
}
public static void main(String[] args) throws IOException
{
final Test demo = new Test("Test XY Line chart");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}
我的数据集的前10行看起来像这样:
time x y z
0.003 -0.13 0.83 0.6
0.009 -0.12 0.83 0.61
0.012 -0.12 0.82 0.6
0.018 -0.13 0.81 0.61
0.021 -0.13 0.8 0.61
0.025 -0.12 0.8 0.61
0.033 -0.12 0.79 0.6
0.034 -0.11 0.79 0.6
0.039 -0.11 0.79 0.58
0.044 -0.11 0.77 0.57
答案 0 :(得分:2)
您的评论在哪里 - 您需要首先浏览readNextLine
的元素,其中String[]
的每个元素都将包含您文件中给定行的值(假设您的文件格式正确)如你所说)。所以 - 你需要把它们变成变量。您尚未指定这些格式的格式,或Time
,X
,Y
和Z
的数据类型。
鉴于您正在查看XY
图表并且您的轴标有Time
和acceleration
- 我会猜测他们是所有浮点数,小数点为Time
,其他变量为各轴加速度。注 - 如果这个假设是错误的 - 您可能需要使用不同的转换器,例如Integer.valueOf()
,但原理是相同的。
while
循环之前,设置要添加到的系列。您将在while循环中逐行添加
final XYSeries seriesX = new XYSeries("X");
final XYSeries seriesY = new XYSeries("Y");
final XYSeries seriesZ = new XYSeries("Z");
在while
循环中,您的评论为
//add values to dataset
double Time = Double.valueOf(readNextLine[0]);
double X = Double.valueOf(readNextLine[1]);
double Y = Double.valueOf(readNextLine[2]);
double Z = Double.valueOf(readNextLine[3]);
seriesX.add(Time, X);
seriesY.add(Time, Y);
seriesZ.add(Time, Z);
并在while
循环之后将3系列添加到集合中,然后再返回它:
dataset.addSeries(seriesX);
dataset.addSeries(seriesY);
dataset.addSeries(seriesZ);
最后 - 两条评论
您的逻辑在数据集创建方面有点奇怪。在构造函数中,创建数据集并将其传递给createChart()
。这是非常标准的。但是,然后在对ChartFactory.createXYLineChart(
的调用中内联调用createDataset(),从而使第一次创建数据毫无意义并再次完成所有操作。它会起作用,但是很浪费,可能会掩盖你打算让代码去做的其他事情。
if
签入createDataset()
是多余的 - 您已经在基于条件的while循环中,这意味着它始终是真的。
if (readNextLine != null)
{
编辑 - 添加了完整的工作版本以清除多条评论中的混淆
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import au.com.bytecode.opencsv.CSVReader;
public class Test extends ApplicationFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
XYSeriesCollection dataset;
JFreeChart chart;
final ChartPanel chartPanel;
final int chartWidth = 560;
final int chartHeight = 367;
CSVReader reader;
String[] readNextLine;
XYSeries series;
public Test(String applicationTitle) throws IOException {
super(applicationTitle);
dataset = createDataset();
chart = createChart(dataset);
chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(chartHeight,
chartWidth));
this.add(chartPanel);
}
public XYSeriesCollection createDataset() throws NumberFormatException,
IOException {
dataset = new XYSeriesCollection();
try {
reader = new CSVReader(new FileReader("res\\data.csv"),'\t');
// Read the header and chuck it away
readNextLine = reader.readNext();
// Set up series
final XYSeries seriesX = new XYSeries("X");
final XYSeries seriesY = new XYSeries("Y");
final XYSeries seriesZ = new XYSeries("Z");
while ((readNextLine = reader.readNext()) != null) {
// add values to dataset
double Time = Double.valueOf(readNextLine[0]);
double X = Double.valueOf(readNextLine[1]);
double Y = Double.valueOf(readNextLine[2]);
double Z = Double.valueOf(readNextLine[3]);
seriesX.add(Time, X);
seriesY.add(Time, Y);
seriesZ.add(Time, Z);
}
System.out.println(seriesX.getMaxX() + "; " + seriesX.getMaxY());
dataset.addSeries(seriesX);
dataset.addSeries(seriesY);
dataset.addSeries(seriesZ);
} catch (FileNotFoundException e) {
System.out.println("File not found!");
}
return dataset;
}
public JFreeChart createChart(XYDataset dataset)
throws NumberFormatException, IOException {
chart = ChartFactory.createXYLineChart("Acceleration vs Time", // chart
// title
"Time", // domain axis label
"Acceleration", // range axis label
dataset, // data
PlotOrientation.VERTICAL, // the plot orientation
true, // legend
true, // tooltips
false); // urls
return chart;
}
public static void main(String[] args) throws IOException {
System.out.println("In here, to create a Test");
final Test demo = new Test("Test XY Line chart");
System.out.println("Created, pakcking");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}