用C 和openGL实现贝塞尔曲线的生成

C 和 openGL 环境下编程生成贝塞尔曲线：#include#include#include#include#include#includevoid setWindow(GLdouble left,GLdouble right,GLdouble buttom,GLdouble top)glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(left,right,buttom,top);void setViewport(GLint left,GLint right,GLint bottom,GLint top)glViewport(left,bottom,right-left,top-bottom);int zuhe(int n,int k)int i,s1,s2;s1=1;s2=1;if(k=0) return 1;for(i=n;i=n-k+1;i-) s1=s1*i;for(i=k;i=2;i-) s2=s2*i;return s1/s2;float fang(float n,int k)if(k=0) return 1;return pow(n,k);float benkn(int n,int k,float t)return zuhe(n,k)*fang(t,k)*fang(1-t,n-k);void myInit(void)glClearColor(1.0,1.0,1.0,0.0);glColor3f(1.0f,0.0f,0.0f);glPointSize(4.0);glMatrixMode(GL_PROJECTION);glLoadIdentity();gluOrtho2D(0.0,640.0,0.0,480.0);void myDisplay(void)glClear(GL_COLOR_BUFFER_BIT);float t11=0,x4=1,4,6,10,y4=1,5,7,2,x111,y111,s=0.0;int i;for(i=1;i11;i+) s=s+0.1;ti=s;for(i=0;i11;i+)x1i=x0*benkn(3,0,ti)+x1*benkn(3,1,ti)+x2*benkn(3,2,ti)+x3*benkn(3,3,ti);y1i=y0*benkn(3,0,ti)+y1*benkn(3,1,ti)+y2*benkn(3,2,ti)+y3*benkn(3,3,ti);printf(“%f,%f,%f,%fn“,x0,x1,x2,x3);printf(“%f,%f,%f,%fn“,y0,y1,y2,y3);for(i=0;i11;i+) printf(“%5.2f“,ti);printf(“n“);for(i=0;i11;i+) printf(“%5.2f“,x1i);printf(“n“);for(i=0;i11;i+) printf(“%5.2f“,y1i);glBegin(GL_POINTS);glVertex2f(x0,y0);glVertex2f(x1,y1);glVertex2f(x2,y2);glVertex2f(x3,y3);glEnd();glBegin(GL_LINE_STRIP);for(i=0;i11;i+)glVertex2f(x1i,y1i);glEnd();glFlush();void main(int argc,char* argv)glutInit(glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);glutInitWindowSize(640,480);glutInitWindowPosition(100,150);glutCreateWindow(“my first attempt“);glutDisplayFunc(myD