JOGL – OpenGL Example

Bitmap Fonts

Two Steps:

1. Set Position

gl.glRasterPos2i(x,y);

2. Draw Text – using GLUT

glut.glutBitmapString(gl, Font Type, “text string”);

Defined Font Styles

Defined Constant	Value
BITMAP_8_BY_13	3
BITMAP_9_BY_15	2
BITMAP_HELVETICA_10	6
BITMAP_HELVETICA_12	7
BITMAP_HELVETICA_18	8
BITMAP_TIMES_ROMAN_10	4
BITMAP_TIMES_ROMAN_24	5

Can specify font by either defined constant or numerical value:

glut.glutBitmapString(gl, BITMAP_HELVETICA_12, “Hello World”);

glut.glutBitmapString(gl, 7, “Hello World”);

Example:

import java.awt.*;

import java.awt.event.*;

import net.java.games.jogl.*;

import net.java.games.jogl.util.*;

public class BitMapFont

{

public static void main(String[] args)

{

Frame frame = new Frame("BitMap Fonts");

GLCanvas canvas = GLDrawableFactory.getFactory().createGLCanvas(new GLCapabilities());

canvas.addGLEventListener(new Renderer());

frame.add(canvas);

frame.setSize(400, 300);

frame.addWindowListener(new WindowAdapter()

{

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

frame.show();

canvas.requestFocus();

}

static class Renderer implements GLEventListener, KeyListener

{

public void display(GLDrawable gLDrawable)

{

String [] fonts = { "BitMap 9 by 15", "BitMap 8 by 13",

"Times Roman 10 Point ", "Times Roman 24 Point ",

"Helvetica 10 Point ","Helvetica 12 Point ","Helvetica 18 Point "};

final GL gl = gLDrawable.getGL();

final GLUT glut = new GLUT();

gl.glClear (GL.GL_COLOR_BUFFER_BIT); // Set display window to color.

gl.glColor3f (0.0f, 0.0f, 0.0f); // Set text e.color to black

gl.glMatrixMode (GL.GL_MODELVIEW);

gl.glLoadIdentity();

int x = 20, y=15;

for (int i=0; i<7;i++){

gl.glRasterPos2i(x,y); // set position

glut.glutBitmapString(gl, i+2, fonts[i]);

y+= 20;

}

}

public void displayChanged(GLDrawable gLDrawable, boolean modeChanged, boolean deviceChanged)

{

}

public void init(GLDrawable gLDrawable)

{

final GL gl = gLDrawable.getGL();

final GLU glu = gLDrawable.getGLU();

gl.glMatrixMode (GL.GL_PROJECTION);

gl.glClearColor (1.0f, 1.0f, 1.0f, 0.0f); //set background to white

glu.gluOrtho2D (0.0, 200.0, 0.0, 150.0); // define drawing area

gLDrawable.addKeyListener(this);

}

public void reshape(GLDrawable gLDrawable, int x, int y, int width, int height)

{

}

public void keyPressed(KeyEvent e)

{

if (e.getKeyCode() == KeyEvent.VK_ESCAPE)

System.exit(0);

}

public void keyReleased(KeyEvent e) {}

public void keyTyped(KeyEvent e) {}

}

}