www.pudn.com > MatlabSIFT.zip > drawbox.m

function drawbox(ang,sz,xc,yc,clr) 
 
    ang=-ang; 
   b = [1 1; -1 1; -1 -1; 1 -1; 1 1] * sz; 
   t = [ sin(ang) cos(ang);cos(ang) -sin(ang)]; 
   b = (t*b')'; 
   b(:,2)=b(:,2)+xc; 
   b(:,1)=b(:,1)+yc; 
   plot(b(:,2),b(:,1),'color',clr);