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(0, 0, PT), new charpoint(0, 9, PT), // new charpoint(1, 10, PT), new charpoint(4, 10, PT),// new charpoint(5, 9, PT), new charpoint(5, 0, STROKE),// new charpoint(0, 5, PT), new charpoint(5, 5, END) }; charpoint Edata[] = { new charpoint(5, 0, PT), new charpoint(0, 0, PT), // new charpoint(0, 10, PT), new charpoint(5, 10, STROKE),// new charpoint(0, 5, PT), new charpoint(4, 5, END) }; charpoint Pdata[] = { new charpoint(0, 0, PT), new charpoint(0, 10, PT),// new charpoint(4, 10, PT), new charpoint(5, 9, PT),// new charpoint(5, 6, PT), new charpoint(4, 5, PT), // new charpoint(0, 5, END) }; charpoint Rdata[] = { new charpoint(0, 0, PT), new charpoint(0, 10, PT),// new charpoint(4, 10, PT), new charpoint(5, 9, PT),// new charpoint(5, 6, PT), new charpoint(4, 5, PT),// new charpoint(0, 5, STROKE), new charpoint(3, 5, PT),// new charpoint(5, 0, END) }; charpoint Sdata[] = { new charpoint(0, 1, PT), new charpoint(1, 0, PT), // new charpoint(4, 0, PT), new charpoint(5, 1, PT),// new charpoint(5, 4, PT), new charpoint(4, 5, PT), // new charpoint(1, 5, PT), new charpoint(0, 6, PT), // new charpoint(0, 9, PT), new charpoint(1, 10, PT),// new charpoint(4, 10, PT), new charpoint(5, 9, 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(440, 120); 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(8.0f, 0.0f, 0.0f); gl.glEndList(); } public void display(GLAutoDrawable drawable) { GL gl = drawable.getGL(); // gl.glClear(GL.GL_COLOR_BUFFER_BIT); gl.glColor3f(1.0f, 1.0f, 1.0f); gl.glPushMatrix(); gl.glScalef(2.0f, 2.0f, 2.0f); gl.glTranslatef(10.0f, 30.0f, 0.0f); this.printStrokedString(gl, test1); gl.glPopMatrix(); gl.glPushMatrix(); gl.glScalef(2.0f, 2.0f, 2.0f); gl.glTranslatef(10.0f, 13.0f, 0.0f); 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(0, 0, 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(8.0f, 0.0f, 0.0f); 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) { }}