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How to use glCallLists in JOGL E-mail
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This program demonstrates some characters of a stroke (vector) font. The characters are represented by display lists, which are given numbers which correspond to the ASCII values of the characters. Use of glCallLists() is demonstrated. The example is ported from C examples in the OpenGL Programming Guide (known as the "red book").


Image

-> Copyright and Permission Notice

package glredbook10;

/**
 * This program demonstrates some characters of a stroke (vector) font. The
 * characters are represented by display lists, which are given numbers which
 * correspond to the ASCII values of the characters. Use of glCallLists() is
 * demonstrated.
 
 @author Kiet Le (Java port)
 */
import java.awt.event.*;
import javax.swing.*;

import java.nio.*;

import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;

public class stroke
  extends JFrame
    implements GLEventListener, KeyListener
{
  private GLU glu;
  private GLCapabilities caps;
  private GLCanvas canvas;
  //
  private static final int PT = 1;
  private static final int STROKE = 2;
  private static final int END = 3;

  // * C struct. Compare this to charpoint class.
  // typedef struct charpoint
  // {
  // GLfloat x, y;
  // int type;
  // } CP;
  private class charpoint
  {
    public float x;
    public float y;
    public int type;

    public charpoint(float x, float y, int type)
    {
      this.x = x;
      this.y = y;
      this.type = type;
    }
  }

  // * Saved here from original for you to see the difference
  // CP Adata[] =
  // {
  // { 0, 0, PT}, {0, 9, PT}, {1, 10, PT}, {4, 10, PT},
  // {5, 9, PT}, {5, 0, STROKE}, {0, 5, PT}, {5, 5, END}
  // };
  charpoint Adata[] =
  new charpoint(00, PT)new charpoint(09, PT)//
    new charpoint(110, PT)new charpoint(410, PT),//
    new charpoint(59, PT)new charpoint(50, STROKE),//
    new charpoint(05, PT)new charpoint(55, END) };

  charpoint Edata[] =
  new charpoint(50, PT)new charpoint(00, PT)//
    new charpoint(010, PT)new charpoint(510, STROKE),//
    new charpoint(05, PT)new charpoint(45, END) };

  charpoint Pdata[] =
  new charpoint(00, PT)new charpoint(010, PT),//
    new charpoint(410, PT)new charpoint(59, PT),//
    new charpoint(56, PT)new charpoint(45, PT)//
    new charpoint(05, END) };

  charpoint Rdata[] =
  new charpoint(00, PT)new charpoint(010, PT),//
    new charpoint(410, PT)new charpoint(59, PT),//
    new charpoint(56, PT)new charpoint(45, PT),//
    new charpoint(05, STROKE)new charpoint(35, PT),//
    new charpoint(50, END) };

  charpoint Sdata[] =
  new charpoint(01, PT)new charpoint(10, PT)//
    new charpoint(40, PT)new charpoint(51, PT),//
    new charpoint(54, PT)new charpoint(45, PT)//
    new charpoint(15, PT)new charpoint(06, PT)//
    new charpoint(09, PT)new charpoint(110, PT),//
    new charpoint(410, PT)new charpoint(59, END) };

  // char *test1 = "A SPARE SERAPE APPEARS AS"; C char ptr to str ...
  // char *test2 = "APES PREPARE RARE PEPPERS";
  private String test1 = "A SPARE SERAPE APPEARS AS";// String object
  private String test2 = "APES PREPARE RARE PEPPERS";

  public stroke()
  {
    super("stroke");

    caps = new GLCapabilities();
    canvas = new GLCanvas(caps);
    canvas.addGLEventListener(this);
    canvas.addKeyListener(this);
 
    getContentPane().add(canvas);
  }

  public void run()
  {
    setSize(440120);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
    canvas.requestFocusInWindow();
  }

  public static void main(String[] args)
  {
    new stroke().run();
  }

  /* Create a display list for each of 6 characters */
  public void init(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    glu = new GLU();

    int base;

    gl.glShadeModel(GL.GL_FLAT);

    base = gl.glGenLists(128);
    gl.glListBase(base);
    gl.glNewList(base + 'A', GL.GL_COMPILE);
    drawLetter(gl, Adata);
    gl.glEndList();
    gl.glNewList(base + 'E', GL.GL_COMPILE);
    drawLetter(gl, Edata);
    gl.glEndList();
    gl.glNewList(base + 'P', GL.GL_COMPILE);
    drawLetter(gl, Pdata);
    gl.glEndList();
    gl.glNewList(base + 'R', GL.GL_COMPILE);
    drawLetter(gl, Rdata);
    gl.glEndList();
    gl.glNewList(base + 'S', GL.GL_COMPILE);
    drawLetter(gl, Sdata);
    gl.glEndList();
    gl.glNewList(base + ' ', GL.GL_COMPILE);
    gl.glTranslatef(8.0f0.0f0.0f);
    gl.glEndList();
  }

  public void display(GLAutoDrawable drawable)
  {
    GL gl = drawable.getGL();
    //
    gl.glClear(GL.GL_COLOR_BUFFER_BIT);
    gl.glColor3f(1.0f1.0f1.0f);

    gl.glPushMatrix();
    gl.glScalef(2.0f2.0f2.0f);
    gl.glTranslatef(10.0f30.0f0.0f);
    this.printStrokedString(gl, test1);
    gl.glPopMatrix();

    gl.glPushMatrix();
    gl.glScalef(2.0f2.0f2.0f);
    gl.glTranslatef(10.0f13.0f0.0f);
    this.printStrokedString(gl, test2);
    gl.glPopMatrix();

    gl.glFlush();
  }

  public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h)
  {
    GL gl = drawable.getGL();

    gl.glViewport(00, w, h);
    gl.glMatrixMode(GL.GL_PROJECTION);
    gl.glLoadIdentity();
    glu.gluOrtho2D(0, w, 0, h);
    gl.glMatrixMode(GL.GL_MODELVIEW);
    gl.glLoadIdentity();
  }

  public void displayChanged(GLAutoDrawable drawable, boolean modeChanged,
      boolean deviceChanged)
  {
  }

  /*
   * interprets the instructions from the array for that letter and renders the
   * letter with line segments.
   */
  private void drawLetter(GL gl, charpoint[] l)
  {
    int i = 0;
    gl.glBegin(GL.GL_LINE_STRIP);
    while (i < l.length)
    {
      switch (l[i].type) {
        case PT:
          gl.glVertex2f(l[i].x, l[i].y);
          break;
        case STROKE:
          gl.glVertex2f(l[i].x, l[i].y);
          gl.glEnd();
          gl.glBegin(GL.GL_LINE_STRIP);
          break;
        case END:
          gl.glVertex2f(l[i].x, l[i].y);
          gl.glEnd();
          gl.glTranslatef(8.0f0.0f0.0f);
          return;
      }
      i++;// System.out.println(i+" ");
    }
  }

  // private void printStrokedString(char *s)
  private void printStrokedString(GL gl, String s)
  {
    int len = s.length();
    ByteBuffer str = BufferUtil.newByteBuffer(len);
    str.put(s.getBytes());
    str.rewind();
    gl.glCallLists(len, GL.GL_BYTE, str);
  }

  public void keyTyped(KeyEvent key)
  {
  }

  public void keyPressed(KeyEvent key)
  {
    switch (key.getKeyCode()) {
      case KeyEvent.VK_ESCAPE:
        System.exit(0);
        break;

      default:
        break;
    }
  }

  public void keyReleased(KeyEvent key)
  {
  }
}

Source: Kiet Le's The Red Book Examples using JOGL


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