画心程序1C语言画心.doc

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1、通过Windows编程，利用余弦函数实现。#include#include#include#include#include#definea60#definePI3.1415926floatth=PI/180;voidStartPic(void){intgr=DETECT,gm;initgraph(&gr,&gm,"c://turboc2");cleardevice();}voidClosePic(void){getch();//restorecrtmode();}voidDrawXin(intx0

2、,inty0,intk){floati,x,y,tx,ty;for(i=-180.0;i<=180.0;i+=0.01){x=a*(2*cos(i*th)-cos(2*i*th));y=a*(2*sin(i*th)-sin(2*i*th));tx=x;ty=y;x=tx*cos(k*th)-ty*sin(k*th)+x0;y=y0-(ty*cos(k*th)+tx*sin(k*th));putpixel(x,y,RED);}setfillstyle(1,RED);floodfill(320,240,RED);}voidmain(void){StartPic();DrawXin(320,240

3、,90);ClosePic();}