Icon Analyst 53 -- Supplementary Material
Last updated May 16, 1999
Weaving Drafts
Graphics Corner -- Changing Image Colors
Figure 1. The Application Interface
Figure 2. An Example Image
Figure 3. Color Dialog
Figure 4. Modified Color Dialog
Figure 5. The Modified Image
Answers to Quiz on Expression Evaluation
2. False.
3. True; by the case expression failing, the evaluation of a selected case clause failing, or if no case clause is selected.
4. True: If the selected case clause is a generator, the case clause generates its results.
5. True: break can have an argument expression, as in
break 1 to 10
which geneates 1, 2, ..., 10 if the break expression is evaluated.
6. Assigns 1 to i; there is no failure to cause the to expression to be resumed.
7. True.
8. True is a sense: If x is a file stream that never termiantes.
9. False. If x is empty, ?x fails and |?x produces no result.
10. The first expression fails, since every fails after generating and write() inherits the failure.
The second expression writes
7
7
7
7
7
11.
a:
1
2
3
4
5
5
4
3
2
1
b.
6
5
4
3
2
7
6
5
4
3
8
7
6
5
4
9
8
7
6
5
10
9
8
7
6
c.
1
2
1
3
2
1
4
3
2
11
12.
a.
1
2
3
4
5
6
7
8
9
b.
1
2
3
4
5
6
7
8
9
c.
1
2
3
4
5
6
7
8
9
1
2
3
d.
1
1
2
1
2
3
1
2
3
4
1
2
3
4
5
e.
1
2
3
4
5
6
7
f.
1
1
2
1
2
3
1
2
3
1
2
1
13. The first expression fails. The other three are "black holes" that never terminate or produce a result.
The Air Horse
