OpenGL GLUT sierpinski triangle code example
标签:
OpenGL
C++
发布于:2020-04-09 22:54:19
编辑于:2022-11-15 12:16:43
浏览量:2797
/*
title: OpenGL GLUT sierpinski triangle code example
tags:
- OpenGL
- C++
*/
#include <GL/glut.h>
GLfloat v[3][2] =
{
{0.0, 0.732},
{1.0, -1.0},
{-1.0, -1.0}
};
int n;
int win;
bool isPaused = true;
void triangle(GLfloat* a, GLfloat* b, GLfloat* c)
{
glVertex2fv(a);
glVertex2fv(b);
glVertex2fv(c);
}
void divide_triangle(GLfloat* a, GLfloat* b, GLfloat* c, int m)
{
GLfloat v0[2], v1[2], v2[2];
int j;
if (m > 0)
{
for (j = 0; j < 2; j++) v0[j] = (a[j] + b[j]) / 2;
for (j = 0; j < 2; j++) v1[j] = (a[j] + c[j]) / 2;
for (j = 0; j < 2; j++) v2[j] = (b[j] + c[j]) / 2;
divide_triangle(a, v0, v1, m - 1);
divide_triangle(c, v1, v2, m - 1);
divide_triangle(b, v2, v0, m - 1);
}
else
triangle(a, b, c);
}
void special(int key, int, int) {
switch (key)
{
case GLUT_RIGHT_BUTTON: isPaused = true; break;
case GLUT_LEFT_BUTTON: isPaused = false; break;
case GLUT_KEY_DOWN:
glutDestroyWindow(win);
break;
default: return;
}
glutPostRedisplay();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
divide_triangle(v[0], v[1], v[2], n);
glEnd();
glFlush();
}
void init()
{
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(0.0, 0.0, 0.0, 1.0);
glColor3f(1.0, 0.0, 0.0);
}
int main(int argc, char** argv)
{
n = 9;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize(1000, 1000);
int win = glutCreateWindow("sierpinski-triangle");
glutDisplayFunc(display);
glutSpecialFunc(special);
init();
glutMainLoop();
}
未经允许,禁止转载,本文源站链接:https://iamazing.cn/