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/* 2-d serpinski gasket
*
* Akshay Oppiliappan
*/
#include <GL/glut.h>
#include <stdlib.h>
#include <time.h>
typedef GLfloat point2[2];
float rand_float() { return 1 * (float)rand() / (float)RAND_MAX; }
void myInit() {
glClearColor(1.0, 1.0, 1.0, 1.0);
glColor3f(rand_float(), rand_float(), rand_float());
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(0.0, 500.0, 0.0, 500.0);
glMatrixMode(GL_MODELVIEW);
}
void triangle(point2 a, point2 b, point2 c) {
glBegin(GL_TRIANGLES);
glVertex2fv(a);
glVertex2fv(b);
glVertex2fv(c);
glEnd();
}
void divide_triangle(point2 a, point2 b, point2 c, int k) {
point2 ab, ac, bc;
int j;
if (k > 0) {
for (j = 0; j < 2; j++)
ab[j] = (a[j] + b[j]) / 2;
for (j = 0; j < 2; j++)
ac[j] = (a[j] + c[j]) / 2;
for (j = 0; j < 2; j++)
bc[j] = (b[j] + c[j]) / 2;
divide_triangle(a, ab, ac, k - 1);
divide_triangle(c, ac, bc, k - 1);
divide_triangle(b, bc, ab, k - 1);
} else {
triangle(a, b, c);
}
}
void display() {
glClear(GL_COLOR_BUFFER_BIT);
point2 v[3] = {{0.0, 0.0}, {250.0, 500.0}, {500.0, 0.0}};
divide_triangle(v[0], v[1], v[2], 8);
glFlush();
}
int main(int argc, char *argv[]) {
srand(time(0));
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(500, 500);
glutInitWindowPosition(0, 0);
glutCreateWindow("Sierpinski Gasket");
glutDisplayFunc(display);
myInit();
glutMainLoop();
}
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