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/* textext.c - by David Blythe, SGI */
/* Example of using texturing for 3D transformable fonts. */
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include "texture.h"
#include "textmap.h"
static float scale = .03;
static char *string = "OpenGL rules";
static float transx, transy, rotx, roty;
static int ox = -1, oy = -1;
static int mot = 0;
#define PAN 1
#define ROT 2
void
pan(int x, int y)
{
transx += (x - ox) / 500.;
transy -= (y - oy) / 500.;
ox = x;
oy = y;
glutPostRedisplay();
}
void
rotate(int x, int y)
{
rotx += x - ox;
if (rotx > 360.)
rotx -= 360.;
else if (rotx < -360.)
rotx += 360.;
roty += y - oy;
if (roty > 360.)
roty -= 360.;
else if (roty < -360.)
roty += 360.;
ox = x;
oy = y;
glutPostRedisplay();
}
void
motion(int x, int y)
{
if (mot == PAN)
pan(x, y);
else if (mot == ROT)
rotate(x, y);
}
void
mouse(int button, int state, int x, int y)
{
if (state == GLUT_DOWN) {
switch (button) {
case GLUT_LEFT_BUTTON:
mot = PAN;
motion(ox = x, oy = y);
break;
case GLUT_MIDDLE_BUTTON:
mot = ROT;
motion(ox = x, oy = y);
break;
case GLUT_RIGHT_BUTTON:
break;
}
} else if (state == GLUT_UP) {
mot = 0;
}
}
void
up(void)
{
scale += .0025;
}
void
down(void)
{
scale -= .0025;
}
void
help(void)
{
printf("Usage: textext [string]\n");
printf("'h' - help\n");
printf("'UP' - scale up\n");
printf("'DOWN' - scale down\n");
printf("left mouse - pan\n");
printf("middle mouse - rotate\n");
}
void
init(void)
{
texfntinit("Times-Italic.bw");
glEnable(GL_TEXTURE_2D);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(90., 1., .1, 10.);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0., 0., -1.5);
}
void
display(void)
{
float width = texstrwidth(string);
glClear(GL_COLOR_BUFFER_BIT);
glPushMatrix();
glTranslatef(transx, transy, 0.f);
glRotatef(rotx, 0., 1., 0.);
glRotatef(roty, 1., 0., 0.);
glScalef(scale, scale, 0.);
glTranslatef(-width * 5, 0.f, 0.f);
texfntstroke(string, 0.f, 0.f);
glPopMatrix();
glutSwapBuffers();
}
void
reshape(int w, int h)
{
glViewport(0, 0, w, h);
}
/* ARGSUSED1 */
void
key(unsigned char key, int x, int y)
{
switch (key) {
case 'h':
help();
break;
case '\033':
exit(1);
break;
default:
break;
}
}
/* ARGSUSED1 */
void
special(int key, int x, int y)
{
switch (key) {
case GLUT_KEY_UP:
up();
break;
case GLUT_KEY_DOWN:
down();
break;
}
glutPostRedisplay();
}
int
main(int argc, char **argv)
{
if (argc > 1)
string = argv[1];
glutInit(&argc, argv);
glutInitWindowSize(512, 512);
glutInitDisplayMode(GLUT_RGBA | GLUT_DOUBLE);
(void) glutCreateWindow("textext");
init();
glutDisplayFunc(display);
glutKeyboardFunc(key);
glutSpecialFunc(special);
glutReshapeFunc(reshape);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}
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