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Test about Line "viewed" by rectangle

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*      
 *      
   *------  
    |*   |   
    |  * |       Two points outside rect,and cross the corner
    -----*
          *
            *
*      
 *      
   *------  
    |*   |   
    |    |        one point inside rect,and cross the corner
    ------
         
    ------  
    |*   |   
    |  * |     Two points inside the rectangle
    ------

for the above examples, anyone can provide a fast way to find out Line is "viewed" by a rectangle or not?

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If you just want to know whether the line segment and the box intersect (touch), the SAT (separating axis test) should do the job.

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