in_rect.m

function flag = in_rect(xy, rect_info)
% this function is used to test if the rect is in certain rectangle
% specified by rect_info, flag is a bool function
% [x, y, length/2, length_direction, width/2, width_direction,pic#]
% note that 
c = zeros(1,4);
c(1) = rect_info(3) + rect_info(1)*rect_info(8) - rect_info(2)*rect_info(7);
c(2) = c(1) - 2*rect_info(3);
c(3) = rect_info(6) + rect_info(1)*rect_info(5) - rect_info(2)*rect_info(4);
c(4) = c(3) - 2*rect_info(6);
inner_f = @(x,y)(((-rect_info(8).*x+rect_info(7).*y+c(1)).*...
                 (-rect_info(8).*x+rect_info(7).*y+c(2))<0 )&...
                 ((-rect_info(5).*x+rect_info(4).*y+c(3)).*...
                 (-rect_info(5).*x+rect_info(4).*y+c(4))<0));
flag = inner_f(xy(1), xy(2));