cvcircle

根据像素画圆

intpcircle(IplImage*img,CvPointct,doubler)

{

staticCvPointpre_pt={img->height/2,img->width/2};

doublea,b;

//doublecosθ,sinθ,k;

for(intj=0;jwidth;j++)

for(inti=0;iheight;i++)

{

a=(i-ct.x);

b=(j-ct.y);

//k=sqrt((double)(a*a+b*b));

//cosθ=b/k;

//sinθ=a/k;

//cosθ*cosθ+sinθ*sinθ==1;

//a=r*cosθ;

//b=r*sinθ;

//printf("%d%d%f%f%f%d%d",a,b,k,cosθ,sinθ,i,j);

if(a*a+b*b-r*r-r)

{//if(i*i+j*j-r*r==0)

//pre_pt=cvPoint(i,j);

//cvCircle(img,pre_pt,2,cvScalar(0,0,255,0),CV_FILLED,CV_AA,0);

cvSet2D(img,i,j,cvScalar(0,0,255,0));

}

}

return0;

}