使用Java Applet绘制图形 [英] Plotting a graph using Java Applet

问题描述

我有一个问题，我必须使用excel文件中的一些数据在applet上绘制图形。我需要设计一个小程序，可以在同一个小程序上显示图形和数据。

我很难用Java编写一些代码来编写一些CSVreader和ExcelReader文件。现在，我真的被困在如何获取这些数据并将其绘制在applet上。

我不知道使用哪个类/库来绘制图形，以及如何缩放它，绘制实际点或设计applet本身。如果有人能帮助我，我将不胜感激。

编辑

：

pre $ code> mis（t）nt Vt N（t）h（t）H（t）
1 141 200,000 200,000 0.00071 0.00071
2 103 200,000 199,859 0.00052 0.00122

此处绘制图表对于 mis（t）与 h（t）。

解决方案

也许，您正在寻找的是Java中易于使用的Chart应用程序。答案是 jFreeChart 。他们有很多样本，以便立即开始使用。

关于读取CSV文件以将数据传递给jFreeChart，请使用 OpenCSV

读取CSV文件非常简单 -

  CSVReader rec =新的CSVReader（新的FileReader（filePath））; 
 String [] recLine; （（recLine = rec.readNext（））！= null）{
 //从recLine获取数据
} 
  

让我知道您是否需要更多细节。

I have a problem where I have to draw a graph on an applet using some data in an excel file. I would need to design an applet where I can display the graph and the data on the same applet.

I had a hard time writing some code in Java to code some CSVreader and ExcelReader files. Now, I am really stuck in how to take this data and graph it on an applet.

I don't know which class/libraries to use for drawing the graph and how to scale it and draw the actual points or designing the applet itself. I would appreciate if someone can help me out.

EDIT

Sample input:

mis(t)  nt       Vt       N(t)      h(t)      H(t)
1      141    200,000   200,000   0.00071   0.00071
2      103    200,000   199,859   0.00052   0.00122

Here, the graph is to be plotted for mis(t) vs. h(t).

解决方案

Perhaps, what you are looking for is an easy to use Chart application in Java. The answer is jFreeChart. They have a lots of samples as well to get you started immediately.

And regarding reading CSV files to pass the data to jFreeChart, use OpenCSV

Reading a CSV file is as simple as -

CSVReader rec = new CSVReader(new FileReader(filePath));
String[] recLine;
while ((recLine = rec.readNext()) != null) {
 //Get the data from recLine
}

Let me know if you need more details.

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