xint must be greater than max(min(x0,x1),min(x2,x3)) and lower than min(max(x0,x1),max(x2,x3)) and yint must be greater than max(min(y0,y1),min(y2,y3)) and lower than min(max(y0,y1),max(y2,y3))
xint must be greater than max(min(x0,x1),min(x2,x3)) and lower than min(max(x0,x1),max(x2,x3)) and yint must be greater than max(min(y0,y1),min(y2,y3)) and lower than min(max(y0,y1),max(y2,y3))
And then there is Death