Question
A rectangle is bound by the lines x = 0; y = 0; x = 5 and y = 3. The line segment joining (-1, 0) and (4, 5), if clipped against this window will connect the points _______.
The correct answer is
(0, 1) and (2, 3)
Line equation: The slope is \(\frac{5-0}{4-(-1)}=1\), so y = x + 1.
Window intersections: At the left edge x = 0, y = 1. At the top edge y = 3, x = 2. Both lie on the original segment and within the window, so the clipped segment joins (0, 1) and (2, 3).
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