147 lines
No EOL
3.3 KiB
C++
147 lines
No EOL
3.3 KiB
C++
#include <GL/gl.h>
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#include <GL/glu.h>
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#include <GL/glut.h>
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#include <stdlib.h>
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#include <string.h>
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#define PT 1
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#define STROKE 2
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#define END 3
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typedef struct charpoint
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{
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GLfloat x, y;
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int type;
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} CP;
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CP Adata[] = {
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{0, 0, PT}, {0, 9, PT}, {1, 10, PT}, {4, 10, PT}, {5, 9, PT}, {5, 0, STROKE}, {0, 5, PT}, {5, 5, END}};
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CP Edata[] = {
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{5, 0, PT}, {0, 0, PT}, {0, 10, PT}, {5, 10, STROKE}, {0, 5, PT}, {4, 5, END}};
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CP Pdata[] = {
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{0, 0, PT}, {0, 10, PT}, {4, 10, PT}, {5, 9, PT}, {5, 6, PT}, {4, 5, PT}, {0, 5, END}};
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CP Rdata[] = {
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{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}};
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CP Sdata[] = {
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{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}};
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/* drawLetter() interprets the instructions from the array
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* for that letter and renders the letter with line segments.
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*/
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static void drawLetter(CP *l)
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{
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glBegin(GL_LINE_STRIP);
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while (1)
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{
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switch (l->type)
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{
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case PT:
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glVertex2fv(&l->x);
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break;
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case STROKE:
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glVertex2fv(&l->x);
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glEnd();
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glBegin(GL_LINE_STRIP);
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break;
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case END:
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glVertex2fv(&l->x);
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glEnd();
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glTranslatef(8.0, 0.0, 0.0);
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return;
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}
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l++;
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}
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}
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/* Create a display list for each of 6 characters */
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static void init(void)
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{
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GLuint base;
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glShadeModel(GL_FLAT);
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base = glGenLists(128);
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glListBase(base);
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glNewList(base + 'A', GL_COMPILE);
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drawLetter(Adata);
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glEndList();
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glNewList(base + 'E', GL_COMPILE);
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drawLetter(Edata);
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glEndList();
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glNewList(base + 'P', GL_COMPILE);
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drawLetter(Pdata);
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glEndList();
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glNewList(base + 'R', GL_COMPILE);
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drawLetter(Rdata);
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glEndList();
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glNewList(base + 'S', GL_COMPILE);
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drawLetter(Sdata);
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glEndList();
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glNewList(base + ' ', GL_COMPILE);
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glTranslatef(8.0, 0.0, 0.0);
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glEndList();
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}
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const char *test1 = "A SPARE SERAPE APPEARS AS";
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const char *test2 = "APES PREPARE RARE PEPPERS";
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static void printStrokedString(char *s)
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{
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GLsizei len = strlen(s);
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glCallLists(len, GL_BYTE, (GLbyte *)s);
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}
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void display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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glColor3f(1.0, 1.0, 1.0);
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glPushMatrix();
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glScalef(2.0, 2.0, 2.0);
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glTranslatef(10.0, 30.0, 0.0);
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printStrokedString((char *)test1);
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glPopMatrix();
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glPushMatrix();
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glScalef(2.0, 2.0, 2.0);
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glTranslatef(10.0, 13.0, 0.0);
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printStrokedString((char *)test2);
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glPopMatrix();
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glFlush();
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}
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void reshape(int w, int h)
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{
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glViewport(0, 0, (GLsizei)w, (GLsizei)h);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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gluOrtho2D(0.0, (GLdouble)w, 0.0, (GLdouble)h);
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}
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void keyboard(unsigned char key, int x, int y)
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{
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switch (key)
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{
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case ' ':
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glutPostRedisplay();
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break;
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case 27:
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exit(0);
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}
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}
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int main(int argc, char **argv)
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{
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glutInit(&argc, argv);
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glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
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glutInitWindowSize(440, 120);
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glutCreateWindow(argv[0]);
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init();
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glutReshapeFunc(reshape);
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glutKeyboardFunc(keyboard);
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glutDisplayFunc(display);
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glutMainLoop();
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return 0;
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} |