FreeWRL-opengl编程

// Specification of the External Interface for a VRML applet browser. // FreeWRL Viewer Interface - bypass netscape and go directly // to the viewer. package vrml.external; import java.util.*; import java.applet.*; //JAS import java.awt.*; import java.net.*; import java.io.*; //JAS import java.lang.reflect.*; import vrml.external.Node; //JAS import vrml.external.field.EventOut; import vrml.external.field.EventOutObserver; import vrml.external.field.EventInMFNode; import vrml.external.FreeWRLEAI.EAIoutThread; import vrml.external.FreeWRLEAI.EAIinThread; import vrml.external.FreeWRLEAI.EAIAsyncThread; import vrml.external.exception.InvalidNodeException; import vrml.external.exception.InvalidVrmlException; import vrml.external.BrowserGlobals; import java.lang.System; //JAS - no longer using Netscape import netscape.security.*; public class Browser implements BrowserInterface { //==================================================================== // Threads: // Replies from FreeWRL. static Thread FreeWRLThread; // of type EAIinThread // Send commands to FreeWRL. static EAIoutThread EAIoutSender; // Handle Async communications from FreeWRL (eg, Regisered Listeners) static EAIAsyncThread RL_Async; //==================================================================== // Communication Paths: // FreeWRLThread to Browser - responses from commands to FreeWRL. PrintWriter EAIinThreadtoBrowser; PipedWriter EAIinThreadtoBrowserPipe = null; // static BufferedReader BrowserfromEAI = null; PipedReader BrowserfromEAIPipe = null; // The following are used to send to/from the FreeWRL Browser by: // - EAIinThread Socket EAISocket; Socket sock; static PrintWriter EAIout; // The following pipe listens for replies to events sent to // the FreeWRL VRML viewer via the EAI port. private String reply = ""; // Query Number as sent to the FreeWRL Browser. static int queryno = 1; // Sending to FreeWRL needs to synchronize on an object; static Object FreeWRLToken = new Object(); // Interface methods. public int get_Browser_EVtype (int event) { //System.out.println ("get_Browser_EVtype is returning " + // BrowserGlobals.EVtype[event] + // " for event " + event); return BrowserGlobals.EVtype[event]; } public EventOutObserver get_Browser_EVObserver (int eventno) { // System.out.println ("get_Browser_EVObserver is returning " + // BrowserGlobals.EVObserver[eventno]); return BrowserGlobals.EVObserver[eventno]; } public void Browser_RL_Async_send (String EVentreply, int eventno) { int EVcounter; for (EVcounter=0; EVcounter<BrowserGlobals.EVno; EVcounter++) { if (BrowserGlobals.EVarray[EVcounter] == eventno) { break; } } //System.out.println ("Browser_RL_Async_send sending " + EVentreply + " to number " + EVcounter); RL_Async.send(EVentreply, EVcounter); } // Associates this instance with the first embedded plugin in the current frame. public Browser(Applet pApplet) { int counter; // Create a socket here for an EAI server on localhost int incrport = -1; EAISocket = null; //System.out.println ("trying to open socket on 9877"); //enable privleges //JAS try { //JAS PrivilegeManager.enablePrivilege ("UniversalConnect"); //JAS } catch (Throwable e) { //JAS System.out.println("EAI: not using Netscape"); //JAS } counter = 1; while (EAISocket == null) { try { EAISocket = new Socket("localhost",9877); } catch (IOException e) { // wait up to 30 seconds for FreeWRL to answer. counter = counter + 1; if (counter == 60) { System.out.println ("EAI: Java code timed out finding FreeWRL"); System.exit(1); } try {Thread.sleep (500);} catch (InterruptedException f) { } } } sock = EAISocket; //JAS - these are the same now... //=================================================================== // create the EAIinThread to Browser. // Open the pipe for EAI replies to be sent to us... try { EAIinThreadtoBrowserPipe = new PipedWriter(); BrowserfromEAIPipe = new PipedReader(EAIinThreadtoBrowserPipe); } catch (IOException ie) { System.out.println ("EAI: caught error in new PipedReader: " + ie); } EAIinThreadtoBrowser = new PrintWriter(EAIinThreadtoBrowserPipe); BrowserfromEAI = new BufferedReader (BrowserfromEAIPipe); // Start the readfrom FREEWRL thread... FreeWRLThread = new Thread ( new EAIinThread(sock, pApplet, EAIinThreadtoBrowser, this)); FreeWRLThread.start(); //==================================================================== // Start the thread that allows Registered Listenered // updates to come in. RL_Async = new EAIAsyncThread(); RL_Async.start(); //==================================================================== // create the EAIoutThread - send data to FreeWRL. try { EAIout = new PrintWriter (sock.getOutputStream()); } catch (IOException e) { System.out.print ("EAI: Problem in handshaking with Browser"); } // Start the SendTo FREEWRL thread... EAIoutSender = new EAIoutThread(EAIout); EAIoutSender.start(); //==================================================================== // Browser is "gotten", and is started. return; } // construct an instance of the Browser class // If frameName is NULL, current frame is assumed. public Browser(Applet pApplet, String frameName, int index) { System.out.println ("Browser2 Not Implemented"); } // Get the browser name public static String getName() { String retval; synchronized (FreeWRLToken) { EAIoutSender.send ("" + queryno + "K\n"); retval = getVRMLreply(queryno); queryno += 1; } return retval; } public String getVersion() { String retval; synchronized (FreeWRLToken) { EAIoutSender.send ("" + queryno + "L\n"); retval = getVRMLreply(queryno); queryno += 1; } return retval; } // Get the current velocity of the bound viewpoint in meters/sec, public float getCurrentSpeed() { String retval; synchronized (FreeWRLToken) { EAIoutSender.send ("" + queryno + "M\n"); retval = getVRMLreply(queryno); queryno += 1; } return Float.valueOf(retval).floatValue(); } // Get the current frame rate of the browser, or 0.0 if not available public float getCurrentFrameRate() { String retval; synchronized (FreeWRLToken) { EAIoutSender.send ("" + queryno + "N\n"); retval = getVRMLreply(queryno); queryno += 1; } return Float.valueOf(retval).floatValue(); } // Get the URL for the root of the current world, or an empty string // if not available public String getWorldURL() { String retval; synchronized (FreeWRLToken) { EAIoutSender.send ("" + queryno + "O\n"); retval = getVRMLreply(queryno); queryno += 1; } return retval; } // Replace the current world with the passed array of nodes public void replaceWorld(Node[] nodes) throws IllegalArgumentException { String SysString = ""; String retval; int count; for (count=0; count<nodes.length; count++) { SysString = SysString + " " + nodes[count].nodeptr; } synchronized (FreeWRLToken) { EAIoutSender.send ("" + queryno + "P" + SysString); retval = getVRMLreply(queryno); queryno += 1; } } // Load the given URL with the passed parameters (as described // in the Anchor node) public void loadURL(String[] url, String[] parameter) { System.out.println ("EAI: loadURL Not Implemented"); return