求“一箭穿心” C语言编程

其实这个程序也不难，只要用心形线方程（1-ρ×cosθ)来绘图就可以了。程序如下：

#include<graphics.h>
#include<math.h>

#define FNX(x1) (int)(x+(x1)*sl)
#define FNY(y1) (int)(MAXY-(y+(y1)*sl))
#define R(theta) 1-pow(cos(1*theta),1)

int sl=50,MAXY;
float x1,y1,xs,ys,r,theta;
/*画心*/
void draw(int x,int y)
{
for(theta=0;theta<2*3.14;theta+=0.01)
{r=R(theta);
x1=r*sin(theta);y1=r*cos(theta);
xs=FNX(x1);ys=FNY(y1);
if(theta==0)moveto(xs,ys);else lineto(xs,ys);
}
}

/*画箭头*/
void jian()
{
line(205,235,200,240);
line(200,240,205,245);
line(200,240,214,240);
line(400,240,500,240);
line(485,235,480,240);
line(480,240,485,245);
line(490,235,485,240);
line(485,240,490,245);
line(495,235,490,240);
line(490,240,495,245);
line(500,235,495,240);
line(495,240,500,245);
line(505,235,500,240);
line(500,240,505,245