ACtE08 · Chapter 8Mock Test 04🏛️ Past Licensure QuestionID: 699d684a
In the Cohen-Sutherland line clipping algorithm, what is the 4-bit region code (outcode) for the top-left region outside the clipping window?
In the Cohen-Sutherland line clipping algorithm, what is the 4-bit region code (outcode) for the top-left region outside the clipping window?
Multiple Choice Options
- A
1100
- B
0101
- C
1010
- D✓ Correct Option
1001
Detailed Technical Solution & Explanation
The Cohen-Sutherland 2D line clipping algorithm divides the 2D plane into 9 regions using a 4-bit outcode formatted as TBRL (Bit 4: Top, Bit 3: Bottom, Bit 2: Right, Bit 1: Left):
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Top (Bit 4): 1 if , else 0
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Bottom (Bit 3): 1 if , else 0
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Right (Bit 2): 1 if , else 0
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Left (Bit 1): 1 if , else 0
For the top-left region:
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It is above the window ()
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It is not below the window
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It is not to the right of the window
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It is to the left of the window ()
Assembling TBRL yields: 1001.
Option Analysis:
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Option A (1100): Incorrect; represents an impossible region simultaneously Top and Bottom.
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Option B (0101): Incorrect; represents the Bottom-Left region ().
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Option C (1010): Incorrect; represents the Top-Right region ().
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Option D (1001): Correct; represents the Top-Left region ().
Reference: Mock Test 04NEC Licensure Syllabus