GDI/图象编程

开发平台：
Visual C++

2.c：源码内容
							#include <stdio.h>
#include<math.h>
#include<conio.h>
#include <time.h>
#include<graphics.h>
#define PI 3.1415926
void   Sleeptime(int s)     /*延时函数*/
{
  clock_t start, end;
  start=  clock();
  do
  {
     end   =   clock();
  }while(end-start<s);
  return;
}
float Casteljau(int k,float *controls,float t) /*bezier曲线子函数一*/
      {   int r,i;
           float t1,controlsa[10];
           t1=1.0-t;
           for(i=0;i<=k;i++)
             {controlsa[i]=controls[i];}
           for(r=1;r<=k;r++)
               for(i=0;i<=k-r;i++)
                   {controlsa[i]=t1*controlsa[i]+t*controlsa[i+1];}
           return controlsa[0];
       }
void bezier_to_points(int k,int npoints,float* controls,float* points)/*bezier曲线子函数二*/
       {
       float t,delt;
           int i;
           delt=1.0/npoints;
           t=0.0;
           for(i=0;i<=npoints;i++)
              {   points[i]=Casteljau(k,controls,t);
                   t=t+delt;
               }
       }
    int drawbz(int x,int y,int r) /*画图函数*/
    {
    int  npoints=400;
    int i,color=1;
    float a ;
    float controlsx[4];
    float controlsy[4];
    float points_x[401];
    float points_y[401];
    int k=3;
    for(a=0.0;a<2*PI;a+=2*PI/180)
     {
         controlsx[0]=x;controlsx[1]=x+300*cos(a);
         controlsx[2]=x+1200*cos(a);controlsx[3]=x+1500*cos(a);
         controlsy[0]=y;controlsx[1]=y+100*sin(a);
         controlsx[2]=y+300*sin(a); controlsx[3]=y+600*sin(a);
        bezier_to_points(k,npoints,controlsx,points_x);
        bezier_to_points(k,npoints,controlsy,points_y);
        for(i=0;i<400;i++)
           {
            putpixel(points_x[i],points_y[i],color);
            }
           color++;
      }
    return 0;
    }
  int main()
{
    int i,j,k,t, n;
    int r,x0,y0;
    int graphdriver=DETECT,graphmode;
    printf("input the number of paozhu:n");
    scanf("%d",&n);
    srand((unsigned)time(NULL));
    /*registerbgidriver(EGAVGA_driver);*/        /*大多数编译环境，运行环境都不用这句*/
    initgraph(&graphdriver,&graphmode,"");
    for(i=0;i<n;i++)
    {
        x0=250+ rand()%140;
        y0=240 + rand()%80;
        r=20+rand()%20;
      for(j=480;j>y0;j--)
        {
            for(k=10;k>0;k--)
            {
                putpixel(x0,j+k,RED);
                putpixel(x0-1,j+k,RED);
                putpixel(x0+1,j+k,RED);
            }
          Sleeptime(0.1);
          cleardevice();
        }
        drawbz(x0,y0,r);
        t=5+rand()%10;
        Sleeptime(t);
        cleardevice();
        }
    closegraph();
    return 0;
}  

						