这是这个问题的后续问题。
会发生以下情况：
当我启动图表并拖动图表时，会发生一些奇怪的事情：在某个时间间隔内，似乎每 7 个周期，烛台就会变得越来越小，直到它们变成一条条纹。然后当我进一步拖动时，它们再次变厚，直到它们再次恢复正常大小。这似乎每 7 个周期发生一次。
以下 3 张图片显示了这种现象的一个示例：
以下代码将准确显示我的意思。只需编译并运行它。然后在图表上按住CTRL并单击并按住鼠标。现在尝试将图表向右或向左拖动。在一定的“拖动距离”之后，您会注意到该错误。
我的问题：如何预防/解决这个问题？
代码：
import org.jfree.chart.*;
import org.jfree.chart.axis.*;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.CandlestickRenderer;
import org.jfree.data.xy.*;
import javax.swing.*;
import java.awt.*;
import java.io.*;
import java.net.URL;
import java.text.*;
import java.util.*;
import java.util.List;
public class CandlestickDemo2 extends JFrame {
public CandlestickDemo2(String stockSymbol) {
super("CandlestickDemo");
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DateAxis domainAxis = new DateAxis("Date");
NumberAxis rangeAxis = new NumberAxis("Price");
CandlestickRenderer renderer = new CandlestickRenderer();
XYDataset dataset = getDataSet(stockSymbol);
XYPlot mainPlot = new XYPlot(dataset, domainAxis, rangeAxis, renderer);
//Do some setting up, see the API Doc
renderer.setSeriesPaint(0, Color.BLACK);
renderer.setDrawVolume(false);
rangeAxis.setAutoRangeIncludesZero(false);
domainAxis.setTimeline( SegmentedTimeline.newMondayThroughFridayTimeline() );
//Now create the chart and chart panel
JFreeChart chart = new JFreeChart(stockSymbol, null, mainPlot, false);
ChartPanel chartPanel = new ChartPanel(chart, false);
chartPanel.setPreferredSize(new Dimension(600, 300));
mainPlot.setDomainPannable(true);
mainPlot.setRangePannable(true);
this.add(chartPanel);
this.pack();
}
protected AbstractXYDataset getDataSet(String stockSymbol) {
//This is the dataset we are going to create
DefaultOHLCDataset result = null;
//This is the data needed for the dataset
OHLCDataItem[] data;
//This is where we go get the data, replace with your own data source
data = getData(stockSymbol);
//Create a dataset, an Open, High, Low, Close dataset
result = new DefaultOHLCDataset(stockSymbol, data);
return result;
}
//This method uses yahoo finance to get the OHLC data
protected OHLCDataItem[] getData(String stockSymbol) {
List<OHLCDataItem> dataItems = new ArrayList<OHLCDataItem>();
try {
String strUrl= "http://ichart.yahoo.com/table.csv?s=GOOG&a=2&b=1&c=2013&d=4&e=24&f=2013&g=d&ignore=.csv";
URL url = new URL(strUrl);
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
DateFormat df = new SimpleDateFormat("y-M-d");
String inputLine;
in.readLine();
while ((inputLine = in.readLine()) != null) {
StringTokenizer st = new StringTokenizer(inputLine, ",");
Date date = df.parse( st.nextToken() );
double open = Double.parseDouble( st.nextToken() );
double high = Double.parseDouble( st.nextToken() );
double low = Double.parseDouble( st.nextToken() );
double close = Double.parseDouble( st.nextToken() );
double volume = Double.parseDouble( st.nextToken() );
double adjClose = Double.parseDouble( st.nextToken() );
OHLCDataItem item = new OHLCDataItem(date, open, high, low, close, volume);
dataItems.add(item);
}
in.close();
}
catch (Exception e) {
e.printStackTrace();
}
//Data from Yahoo is from newest to oldest. Reverse so it is oldest to newest
Collections.reverse(dataItems);
//Convert the list into an array
OHLCDataItem[] data = dataItems.toArray(new OHLCDataItem[dataItems.size()]);
return data;
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new CandlestickDemo2("GOOG").setVisible(true);
}
});
}
}
更新
此错误现在是 JFreeChart 的 sourceforge 页面上报告的错误问题。
可以在此处跟踪此错误。
