贝塞尔曲线的生成(可调整控制点).doc

/ homework3_1.cpp : Defines the entry point for the console application./#include stdafx.h#include#include#include#include#include#include#include int wide,height; int lefthit=0;float x4=25,100,150,250,y4=25,125,175,50; void reshape(int w, int h)wide = w;height = h;glViewport(0, 0, w, h);glMatrixMode(GL_PROJECTION);glLoadIdentity(); gluOrtho2D(-w/2,w/2,-h/2,h/2);glMatrixMode(GL_MODELVIEW);glLoadIdentity();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 Init(void)glClearColor(1.0,1.0,1.0,0.0);void display(void)glClear(GL_COLOR_BUFFER_BIT); glPointSize(8.0); glColor3f(1.0f,0.0f,0.0f); float x111,y111,t11=0,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);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 mouse(int key,int state,int m,int n) if (lefthit=0) glClear(GL_COLOR_BUFFER_BIT);int i=0; glColor3f(1.0f,0.0f,0.0f);if (key=GLUT_LEFT_BUTTON&state = GLUT_DOWN) glBegin(GL_POINTS); for(i=lefthit;i=4) display(); lefthit=0;void main(int argc,char* argv)glutInit(&argc,argv);glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);glutInitWindowSize(640,480);glutInitWindowPosition(100,150);glutCreateWindow(贝塞尔曲线);glutResh