Use JFreeChart to draw a scatter chart

Because the project needs to start Java and JFreeChart class libraries... It really hurts. I read this class library topic of 51cto: Workshop.

It's quite good. It's quite clear. It's just a bit coincident with the official demo. It's all pieChart. Do you dare to change another chart?

Below I will list the three necessary modules for drawing, and the other parts will not be provided one by one. If you need them, please take a look:

 
 

  
  
// Load dataset. Ignore the specific business logic
  
  
Public static XYDataset createxydataset (ArrayList <LineInfo> xydatalist, ArrayListMultimap <Integer, Integer> tabBat ){
  
  
DefaultXYDataset dataset = new DefaultXYDataset ();
  
  
LineInfo tabTmp = xydatalist. get (0 );
  
  
Int numTmp = tabTmp. getMeterNum ();
  
  
Set <Integer> allKey = tabBat. keySet ();
  
  
Iterator <Integer> it = allKey. iterator ();
  
  
Int keyTmp = 0;
  
  
While (it. hasNext ())
  
  
{
  
  
KeyTmp = it. next ();
  
  
If (tabBat. containsEntry (keyTmp, numTmp ))
  
  
Break;
  
  
}
  
  
List <Integer> allNum = tabBat. get (keyTmp );
  
  
Int allNumSize = allNum. size ();
  
  
// Data is the core of data
  
  
Double [] [] data = new double [2] [allNumSize];
  
  
It = allNum. iterator ();
  
  
Iterator <LineInfo> it2 = xydatalist. iterator ();
  
  
Int tmp = 0, count = 0;
  
  
LineInfo lineTmp = new LineInfo ();
  
  
While (it. hasNext ())
  
  
{
  
  
Tmp = it. next ();
  
  
It2 = xydatalist. iterator ();
  
  
While (it2.hasNext ())
  
  
{
  
  
LineTmp = it2.next ();
  
  
If (tmp = lineTmp. getMeterNum ())
  
  
Break;
  
  
}
  
  
Data [0] [count] = lineTmp. getIntercept ();
  
  
Data [1] [count] = lineTmp. getSlope ();
  
  
Count ++;
  
  
}
  
  
// I still don't know the first parameter in addSeries. From the generated chart, it's just the description text in the chart.
  
  
Dataset. addSeries ("table", data );
  
  
Return dataset;
  
  
}
  
  
 
  
  
// Generate a chart object
  
  
Public static JFreeChart createChart (XYDataset xydataset, String title, String xAxis, String yAxis ){
  
  
JFreeChart scatterChart = ChartFactory. createScatterPlot (title, xAxis, yAxis, xydataset, PlotOrientation. VERTICAL, true, false, false );
  
  
Return scatterChart;
  
  
}
  
  
 
  
  
// According to the chart object, set the Image Parameters and draw a picture. This is very important. If you do not pay attention to it, the text of the comment will be garbled.
  
  
Public static void drawScatterChart (JFreeChart scatterChart, String title, String noDataMsg ){
  
  
// Set the font for title, legend, and plot as follows:
  
  
TextTitle textTitle = scatterChart. getTitle ();
  
  
TextTitle. setFont (new Font ("", Font. BOLD, 20 ));
  
  
LegendTitle legend = scatterChart. getLegend ();
  
  
If (legend! = Null)
  
  
{
  
  
Legend. setItemFont (new Font ("", Font. BOLD, 20 ));
  
  
}
  
  
XYPlot scatterPlot = scatterChart. getXYPlot ();
  
  
ScatterPlot. setNoDataMessage (noDataMsg );
  
  
// Draw the following three rows:
  
  
ChartFrame scatterFrame = new ChartFrame (title, scatterChart );
  
  
ScatterFrame. pack ();
  
  
ScatterFrame. setVisible (true );
  
  
}
 
 

In general, it is quite simple to draw other diagrams to check the API.

This article is from the title cannot be blank blog, please be sure to keep this source http://hector.blog.51cto.com/4229131/926904