这是绘制谢尔宾斯基三角形的分形几何的代码,没有错误,但在调试时出现未处理的异常:
Unhandled exception at 0x77e115de in LastFractLast.exe: 0xC0000005: Access violation writing location 0x000000a8.
它会打开一个名为 glu.h 的文件并指向这一行:
static void APIENTRY glutInit_ATEXIT_HACK(int *argcp, char **argv) { __glutInitWithExit(argcp, argv, exit); }
这是我的代码:
#include <glut.h>
GLfloat v[3][2]={{-1.0, -0.58},
{1.0, -0.58}, {0.0, 1.15}};
int n;
void triangle(GLfloat *a, GLfloat *b,
GLfloat *c)
/* display one triangle */
{
glVertex2fv(a);
glVertex2fv(b);
glVertex2fv(c);
}
void divide_triangle(GLfloat *a, GLfloat *b, GLfloat *c,
int m)
{
/* triangle subdivision using vertex numbers */
typedef GLfloat point2[2];
point2 v0, v1, v2;
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));
/* draw triangle at end of recursion */
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
divide_triangle(v[0], v[1], v[2], n);
glEnd();
glFlush();
}
void myinit()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-2.0, 2.0, -2.0, 2.0);
glMatrixMode(GL_MODELVIEW);
glClearColor (1.0, 1.0, 1.0,1.0);
glColor3f(0.0,0.0,0.0);
}
int main(int argc, char **argv)
{
n=4;
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(500, 500);
glutDisplayFunc(display);
myinit();
glutMainLoop();
}