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Diffstat (limited to 'progs/redbook/stroke.c')
| -rw-r--r-- | progs/redbook/stroke.c | 195 |
1 files changed, 195 insertions, 0 deletions
diff --git a/progs/redbook/stroke.c b/progs/redbook/stroke.c new file mode 100644 index 000000000..19b0391cb --- /dev/null +++ b/progs/redbook/stroke.c @@ -0,0 +1,195 @@ + +/* Copyright (c) Mark J. Kilgard, 1994. */ + +/* + * (c) Copyright 1993, Silicon Graphics, Inc. + * ALL RIGHTS RESERVED + * Permission to use, copy, modify, and distribute this software for + * any purpose and without fee is hereby granted, provided that the above + * copyright notice appear in all copies and that both the copyright notice + * and this permission notice appear in supporting documentation, and that + * the name of Silicon Graphics, Inc. not be used in advertising + * or publicity pertaining to distribution of the software without specific, + * written prior permission. + * + * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS" + * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE, + * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR + * FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON + * GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, + * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY + * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, + * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF + * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN + * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE + * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. + * + * US Government Users Restricted Rights + * Use, duplication, or disclosure by the Government is subject to + * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph + * (c)(1)(ii) of the Rights in Technical Data and Computer Software + * clause at DFARS 252.227-7013 and/or in similar or successor + * clauses in the FAR or the DOD or NASA FAR Supplement. + * Unpublished-- rights reserved under the copyright laws of the + * United States. Contractor/manufacturer is Silicon Graphics, + * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. + * + * OpenGL(TM) is a trademark of Silicon Graphics, Inc. + */ +/* + * stroke.c + * 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. + */ +#include <stdlib.h> +#include <string.h> +#include <GL/glut.h> + +#define PT 1 +#define STROKE 2 +#define END 3 + +typedef struct charpoint { + GLfloat x, y; + int type; +} CP; + +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} +}; + +CP Edata[] = { + {5, 0, PT}, {0, 0, PT}, {0, 10, PT}, {5, 10, STROKE}, + {0, 5, PT}, {4, 5, END} +}; + +CP Pdata[] = { + {0, 0, PT}, {0, 10, PT}, {4, 10, PT}, {5, 9, PT}, {5, 6, PT}, + {4, 5, PT}, {0, 5, END} +}; + +CP Rdata[] = { + {0, 0, PT}, {0, 10, PT}, {4, 10, PT}, {5, 9, PT}, {5, 6, PT}, + {4, 5, PT}, {0, 5, STROKE}, {3, 5, PT}, {5, 0, END} +}; + +CP Sdata[] = { + {0, 1, PT}, {1, 0, PT}, {4, 0, PT}, {5, 1, PT}, {5, 4, PT}, + {4, 5, PT}, {1, 5, PT}, {0, 6, PT}, {0, 9, PT}, {1, 10, PT}, + {4, 10, PT}, {5, 9, END} +}; + +/* drawLetter() interprets the instructions from the array + * for that letter and renders the letter with line segments. + */ +void drawLetter(CP *l) +{ + glBegin(GL_LINE_STRIP); + for (;;) { + switch (l->type) { + case PT: + glVertex2fv(&l->x); + break; + case STROKE: + glVertex2fv(&l->x); + glEnd(); + glBegin(GL_LINE_STRIP); + break; + case END: + glVertex2fv(&l->x); + glEnd(); + glTranslatef(8.0, 0.0, 0.0); + return; + } + l++; + } +} + +/* Create a display list for each of 6 characters */ +void myinit (void) +{ + GLuint base; + + glShadeModel (GL_FLAT); + + base = glGenLists (128); + glListBase(base); + glNewList(base+'A', GL_COMPILE); drawLetter(Adata); glEndList(); + glNewList(base+'E', GL_COMPILE); drawLetter(Edata); glEndList(); + glNewList(base+'P', GL_COMPILE); drawLetter(Pdata); glEndList(); + glNewList(base+'R', GL_COMPILE); drawLetter(Rdata); glEndList(); + glNewList(base+'S', GL_COMPILE); drawLetter(Sdata); glEndList(); + glNewList(base+' ', GL_COMPILE); glTranslatef(8.0, 0.0, 0.0); glEndList(); +} + +char *test1 = "A SPARE SERAPE APPEARS AS"; +char *test2 = "APES PREPARE RARE PEPPERS"; + +void printStrokedString(char *s) +{ + GLsizei len = (GLsizei) strlen(s); + glCallLists(len, GL_BYTE, (GLbyte *)s); +} + +void display(void) +{ + glClear(GL_COLOR_BUFFER_BIT); + glColor3f(1.0, 1.0, 1.0); + glPushMatrix(); + glScalef(2.0, 2.0, 2.0); + glTranslatef(10.0, 30.0, 0.0); + printStrokedString(test1); + glPopMatrix(); + glPushMatrix(); + glScalef(2.0, 2.0, 2.0); + glTranslatef(10.0, 13.0, 0.0); + printStrokedString(test2); + glPopMatrix(); + glFlush(); +} + +static void reshape(GLsizei w, GLsizei h) +{ + glViewport(0, 0, w, h); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(0.0, (GLdouble)w, 0.0, (GLdouble)h, -1.0, 1.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + +static void +key(unsigned char k, int x, int y) +{ + switch (k) { + case 27: /* Escape */ + exit(0); + break; + default: + return; + } + glutPostRedisplay(); +} + +/* Main Loop + * Open window with initial window size, title bar, + * RGBA display mode, and handle input events. + */ +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB); + glutInitWindowSize (440, 120); + glutCreateWindow (argv[0]); + myinit (); + glutDisplayFunc(display); + glutReshapeFunc(reshape); + glutKeyboardFunc(key); + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |