Part VII

Part 7: Mirroring Part of a Picture

Sometimes, you only want to mirror part of a picture. For example, Figure 10 shows a Greek temple that's missing part of its roof. In the second image, it looks like the roof was fixed, because the left side was mirrored over.

To do this, you can use the explorer to figure out which pixels you want to mirror. In this case, you would find that you want to mirror rows 27-96 (inclusive) and columns 13-275 (inclusive).

To work with just part of a picture, you just need to change the starting and ending values of your nested for loops. You should check out the mirrorTemple method in the Picture class to see this in action.

Questions

1. How many times would the body of the nested for Question 1 (see below) loop execute?
2. How about the Question 2 loop ?
3. Add some code to mirrorTemple that tracks how many times the body of the nested for loop executes. You should add a variable that is initially set to 0 and then increments by 1 in the body of the loop. Print the value of the variable after the nested loop finishes. Did you get 18,410?
4. Write the method mirrorArms to mirror the arms on the snowman in "snowman.jpg." You should create a snowman (snowmonster?) with 4 arms. Don't forget to test using PictureTester. Copy/paste your mirrorArms method. Include your picture as well.
5. Write mirrorGull to mirror the seagull in "seagull.jpg" to the right so that there are two seagulls on the beach near each other. Copy/paste your method. Include your picture as well.

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