textext.c
上传用户:xk288cn
上传日期:2007-05-28
资源大小:4876k
文件大小:3k
- /* 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' - helpn");
- printf("'UP' - scale upn");
- printf("'DOWN' - scale downn");
- printf("left mouse - pann");
- printf("middle mouse - rotaten");
- }
- 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 ' 33':
- 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. */
- }