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我正在嘗試做什麼標題說。顯然gnuplot能夠做到這一點，但我想用JavaPlot來調用它。 JavaPlot中的Graph3D class使我認爲它是可能的，但由於我沒有找到3D例子，並且幾乎沒有關於JavaPlot的文檔，所以我只有一個大概的想法。如果有人已經知道如何做到這一點，而我的努力正在重新發明輪子，請賜教，但目前我會繼續進行，好像以前沒有人嘗試過這樣做。使用JavaPlot/Gnuplot進行3D製圖
看看GNUPlot類，有一個plot方法，但splot方法被註釋掉了，並且在GNUPlotExec類中沒有相應的方法。我試圖添加一個，但目前它仍然以二維方式繪製。爲了充分披露，我沒有從頭開始，而是修改了當前的繪圖方法。
這是被註釋掉
public void splot() throws GNUPlotException {
exec.splot(param, term);
}
的GNUPlot.class splot方法，這是從劇情方法
void splot(GNUPlotParameters par, GNUPlotTerminal terminal) throws GNUPlotException {
try {
final GNUPlotTerminal term = terminal; // Use this thread-aware variable instead of "terminal"
final String comms = getCommands(par, term); // Get the commands to send to gnuplot
final Messages msg = new Messages(); // Where to store messages from output threads
/* Display plot commands to send to gnuplot */
GNUPlot.getDebugger().msg("** Start of splot commands **", Debug.INFO);
GNUPlot.getDebugger().msg(comms, Debug.INFO);
GNUPlot.getDebugger().msg("** End of splot commands **", Debug.INFO);
/* It's time now to start the actual gnuplot application */
String[] command;
if (ispersist) {
command = persistcommand;
} else {
command = nopersist;
}
command[0] = getGNUPlotPath();
{
String cmdStr = "";
for (String cmd : command) {
cmdStr += cmd + " ";
}
GNUPlot.getDebugger().msg("exec(" + cmdStr + ")", Debug.INFO);
}
final Process proc = Runtime.getRuntime().exec(command);
/* Windows buffers DEMAND asynchronus read & write */
/* Thread to process the STDERR of gnuplot */
Thread err_thread = new Thread() {
public void run() {
BufferedReader err = new BufferedReader(new InputStreamReader(proc.getErrorStream()));
StringBuffer buf = new StringBuffer();
String line;
try {
while ((line = err.readLine()) != null) {
line = parseErrorLine(line, "gnuplot> splot");
line = line.replace("input data ('e' ends) >", "").trim(); // Remove entries having the "input data" prompt
if (line.equals("^")) {
line = "";
} // Ignore line with error pointer
if (!line.equals("")) { // Only take care of not empty lines
if (line.indexOf(GNUPlotParameters.ERRORTAG) >= 0) {
msg.error = "Error while parsing \'splot\' arguments."; // Error was found in plot command
break;
}
buf.append(line).append('\n');
}
}
err.close();
msg.output = buf.toString(); // Store output stream
} catch (IOException ex) {
ex.printStackTrace();
}
}
};
/* Thread to process the STDOUT of gnuplot */
err_thread.start();
Thread out_thread = new Thread() {
public void run() {
msg.process = term.processOutput(proc.getInputStream()); // Execute terminal specific output parsing
}
};
out_thread.start();
/* We utilize the current thread for gnuplot execution */
OutputStreamWriter out = new OutputStreamWriter(proc.getOutputStream());
out.write(comms);
out.flush();
out.close();
try {
proc.waitFor(); // wait for process to finish
out_thread.join(); // wait for output (terminal related) thread to finish
err_thread.join(); // wait for error (messages) output to finish
} catch (InterruptedException ex) {
throw new GNUPlotException("Interrupted execution of gnuplot");
}
/* Find the error message, if any, with precendence to the error thread */
String message = null;
if (msg.error != null) {
message = msg.error;
} else {
message = msg.process;
}
/* Determine if error stream should be dumbed or not */
int level = Debug.VERBOSE;
if (message != null) {
level = Debug.ERROR;
}
GNUPlot.getDebugger().msg("** Start of error stream **", level);
GNUPlot.getDebugger().msg(msg.output, level);
GNUPlot.getDebugger().msg("** End of error stream **", level);
/* Throw an exception if an error occured */
if (message != null) {
throw new GNUPlotException(message);
}
} catch (IOException ex) {
throw new GNUPlotException("IOException while executing \"" + getGNUPlotPath() + "\":" + ex.getLocalizedMessage());
}
}
得到的GNUPlotExec.class splot法這是我的測試我m試圖運行
public static void main(String[] args) {
GNUPlot p = new GNUPlot("path goes here");
FunctionPlot myPlot = new FunctionPlot("tan(x)");
p.addPlot(myPlot);
p.splot();
}
我相信由gnuplot執行的命令是
gnuplot> _gnuplot_error = 1
gnuplot> plot tan(x) title 'tan(x)' ; _gnuplot_error = 0
gnuplot> if (_gnuplot_error == 1) print '_ERROR_'
gnuplot> undefined function: if
當然應該說splot和，不積