Компьютер графикаси

Ilova D. Amaliy topshiriqlarga misollar

Masala 1: Sodda GLUT-ilovasi

Ushbu oddiy masala GLUT ilovasi strukturasini va OpenGL ning oddiy asoslarini ko‘rsatadi. Dastur natijasi uchburchaklar rangini sichqonchaning chap tugmasini bosganda o‘zgaradigan tasodifiy to‘plamidir.
Sichqonchaning o‘ng tugmasi bilan uchburchaklar rangini o‘zgartirish tartibiga yordam beradi.

#include

#include

#ifdef random

#undef random
#endif

#define random(m) (float)rand()*m/RAND_MAX

/* oynaning kengligi va balandligi*/

GLint Width = 512, Height = 512;
/* oynadagi to‘g‘ri to‘rtburchaklar soni*/
int Times = 100;
/* to‘ldiruvchilar bilan */
int FillFlag = 1;
long Seed = 0;
/* uchburchaklarni tasvirlash funksiyasi*/
void
DrawTriang( float x1, float y1, float x2, float y2, float x3, float y3,
int FillFlag )
{
glBegin(FillFlag ? GL_TRIANGLES : GL_LINE_LOOP);
glVertex2f(x1, y1);
glVertex2f(x2, y2);
glVertex2f(x3, y3);
glEnd();
}

/* ekranga chiquvchi barcha axborotlarni boshqarish */

void
Display(void)
{
int i;
float x1, y1, x2, y2, x3, y3;
float r, g, b;
srand(Seed);
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT);

for( i = 0; i < Times; i++ ) {

r = random(1);
g = random(1);
b = random(1);
glColor3f( r, g, b );

x1 = random(1) * Width;

y1 = random(1) * Height;
x2 = random(1) * Width;
y2 = random(1) * Height;
x3 = random(1) * Width;
y3 = random(1) * Height;

DrawRect(x1, y1, x2, y2, x3, y3, FillFlag);

}
glFinish();
}
/* oyna o‘lchamlari o‘zgaradigan funksiya */
void
Reshape(GLint w, GLint h)
{
Width = w;
Height = h;
glViewport(0, 0, w, h);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();
glOrtho(0, w, 0, h, -1.0, 1.0);

glMatrixMode(GL_MODELVIEW);

glLoadIdentity();
}
/*sichqonchadan keladigan ma’lumotni qayta ishlash */
void
Mouse(int button, int state, int x, int y)
{
if( state == GLUT_DOWN ) {
switch( button ) {
case GLUT_LEFT_BUTTON:
Seed = random(RAND_MAX);
break;
case GLUT_RIGHT_BUTTON:
FillFlag = !FillFlag;
break;
}
glutPostRedisplay();
}
}

/* klaviaturadan keladigan ma’lumotni qayta ishlash */

void
Keyboard ( unsigned char key, int x, int y )
{
#define ESCAPE '\033'

if( key == ESCAPE )

exit(0);
}

main(int argc, char *argv[])

{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB);
glutInitWindowSize(Width, Height);
glutCreateWindow("Rect draw example (RGB)");

glutDisplayFunc(Display);

glutReshapeFunc(Reshape);
glutKeyboardFunc(Keyboard);
glutMouseFunc(Mouse);
glutMainLoop();
}