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8.0

Drawing Text using Java SWT OpenGL LWJGL

Asked by sankartadi in 3D Game Programming

Tags: Drawing Text using Java SWT OpenGL LWJGL

Hi,
I have written the following code to display a rectangle using Java, SWT, OpenGL & LWJGL library.  Now I need to draw text on the rectangle.  How do I do that?  Please send working code, if possible.

Thanks
Sankar 
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import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.opengl.GLCanvas;
import org.eclipse.swt.opengl.GLData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GLContext;
import org.lwjgl.util.glu.GLU;
 
public class CallerV3 
{
	public static Shell shell;
	public static Display display;
	public static GLCanvas canvas;
	public static Composite cmp;
	public static MyRunnable myRunnable;
	
	public class MyRunnable implements Runnable
	{
		public void run() 
		{
			if(!canvas.isDisposed()) 
			{	
				canvas.setBounds(0, 0, cmp.getSize().x, cmp.getSize().y);
				canvas.setCurrent();
 
				try 
				{
					GLContext.useContext(canvas);
				} 
				catch(LWJGLException e) 
				{ 
					e.printStackTrace(); 
				}
 
				GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
				GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
				GL11.glLoadIdentity();
				GL11.glTranslatef(0.0f, 0.0f, -10.0f);
 
				
				GL11.glBegin(GL11.GL_QUADS);
 
				GL11.glVertex3d(-1, 2, 0);
				GL11.glVertex3d(-1, -2, 0);
				GL11.glVertex3d(1, -2, 0);
				GL11.glVertex3d(1, 2, 0); 
				
				GL11.glEnd();
			}
 
			if(!canvas.isDisposed()) 
			{
				canvas.swapBuffers();
			}
		}
	}
 
 
	public CallerV3()
	{
		myRunnable = new CallerV3.MyRunnable();
		display = new Display();
		shell = new Shell(display);
		shell.setLayout(new FillLayout());
		cmp = new Composite(shell, SWT.NONE);
		
		GLData data = new GLData ();
		data.doubleBuffer = true;
		canvas = new GLCanvas(cmp, SWT.NONE, data);
		canvas.setCurrent();
 
		try 
		{
			GLContext.useContext(canvas);
		} 
		catch(LWJGLException e) 
		{ 
			e.printStackTrace(); 
		}
 
		canvas.addListener(SWT.Resize, new Listener() 
		{
			public void handleEvent(Event event) 
			{
				listener_Resize(event);
			}
		});
 
		canvas.addPaintListener(new PaintListener()
		{
			public void paintControl(PaintEvent e) 
			{
				// TODO Auto-generated method stub
				myRunnable.run();
			}
		});
		
		shell.open();
 
		listener_Resize(null);
		myRunnable.run();
 
		while (!shell.isDisposed()) 
		{
			if (!display.readAndDispatch())
			{
				display.sleep();
			}
		}
		display.dispose();
	}
 
	public static void main(String[] args)
	{
		CallerV3 callerV3 = new CallerV3();
	}
 
	public void listener_Resize(Event event1)
	{
		if(!canvas.isDisposed()) 
		{
			canvas.setCurrent();
			try 
			{
				GLContext.useContext(canvas);
			} 
			catch(LWJGLException e) 
			{ 
				e.printStackTrace(); 
			}
 
			Rectangle bounds = canvas.getBounds();
			float fAspect = (float) bounds.width / (float) bounds.height;
 
			GL11.glViewport(0, 0, bounds.width, bounds.height);
			GL11.glMatrixMode(GL11.GL_PROJECTION);
			GL11.glLoadIdentity();
			GLU.gluPerspective(45.0f, fAspect, 0.5f, 400.0f);
			GL11.glMatrixMode(GL11.GL_MODELVIEW);
			GL11.glLoadIdentity();
 
			myRunnable.run();
		}
	}
}
[+][-]08/15/09 03:55 AM, ID: 25104829Accepted Solution

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About this solution

Zone: 3D Game Programming
Tags: Drawing Text using Java SWT OpenGL LWJGL
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Solution Provided By: InteractiveMind
Participating Experts: 1
Solution Grade: A
 
[+][-]09/11/09 04:31 AM, ID: 25308280Administrative Comment

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