Magnify | Topcoder Archive

Problem Statement

To magnify an image by a constant integer factor, we can replace each pixel by an appropriate rectangular block of the same pixel. We can magnify horizontally, vertically, or in both directions, possibly with different factors. In fact we can allow negative factors, with the meaning that they both magnify the picture and reflect it. (A negative horizontal scaling causes a reflection across a vertical axis, while a negative vertical scaling causes a reflection across a horizontal axis.)

Create a class Magnify that contains a method enlarge that is given a String[] image and two integer values horFactor and verFactor, representing the horizontal and vertical scaling factors respectively. It returns a String[] showing the image after horFactor and verFactor have been applied.

The characters in the elements of image each represent a pixel in a rectangular black and white picture, either 'X' or '-'. The elements of image each represent a row in the picture with the pixels given from left to right, and the elements start with the top row and proceed toward the bottom.

Definition

Class:: Magnify
Method:: enlarge
Parameters:: String[], int, int
Returns:: String[]
Method signature:: String[] enlarge(String[] image, int horFactor, int verFactor)
(be sure your method is public)

Constraints

image contains between 1 and 10 elements, inclusive.
Each element of image contains the same number of characters, between 1 and 10, inclusive.
Each character in each element of image is 'X' or '-'.
The absolute value of horFactor is between 1 and 5, inclusive.
The absolute value of verFactor is between 1 and 5, inclusive.

Examples

```
{"X"}
```
```
2
```
```
3
```
```
Returns: {"XX", "XX", "XX" }
```
This picure was a single pixel. Now it is twice as big in the x-direction, and three times as big in the y-direction.
```
{"X--",
 "X--",
 "XXX"}
```
```
-1
```
```
2
```
```
Returns: {"--X", "--X", "--X", "--X", "XXX", "XXX" }
```
The original picture has width 3 and height 3 and is an L-shape. After magnification its width is still 3, its height is 6, and the L-shape has been reflected in the x-direction (i.e., about a vertical axis).

{"X--",
 "-X-",
 "-X-"}

-3

Returns: {"--XX--", "--XX--", "--XX--", "--XX--", "--XX--", "--XX--", "XX----", "XX----", "XX----" }

```
{"XX-"}	
```
```
1
```
```
-1
```
```
Returns: {"XX-" }
```

{ "--XX--XX-X", 
 "--XXX----X",
 "XX---X---X",
 "---XX-XXXX",
 "X-XX--XX-X",
 "---XXXX--X",
 "--XXX--X-X",
 "-----X----",
 "-XXX--XXXX",
 "------XXX-"}

-5

Returns: {"XXXXX-----XXXXXXXXXX----------XXXXXXXXXX----------", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX----------", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX----------", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX----------", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX----------", "XXXXX--------------------XXXXXXXXXXXXXXX----------", "XXXXX--------------------XXXXXXXXXXXXXXX----------", "XXXXX--------------------XXXXXXXXXXXXXXX----------", "XXXXX--------------------XXXXXXXXXXXXXXX----------", "XXXXX--------------------XXXXXXXXXXXXXXX----------", "XXXXX---------------XXXXX---------------XXXXXXXXXX", "XXXXX---------------XXXXX---------------XXXXXXXXXX", "XXXXX---------------XXXXX---------------XXXXXXXXXX", "XXXXX---------------XXXXX---------------XXXXXXXXXX", "XXXXX---------------XXXXX---------------XXXXXXXXXX", "XXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXX---------------", "XXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXX---------------", "XXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXX---------------", "XXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXX---------------", "XXXXXXXXXXXXXXXXXXXX-----XXXXXXXXXX---------------", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX-----XXXXX", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX-----XXXXX", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX-----XXXXX", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX-----XXXXX", "XXXXX-----XXXXXXXXXX----------XXXXXXXXXX-----XXXXX", "XXXXX----------XXXXXXXXXXXXXXXXXXXX---------------", "XXXXX----------XXXXXXXXXXXXXXXXXXXX---------------", "XXXXX----------XXXXXXXXXXXXXXXXXXXX---------------", "XXXXX----------XXXXXXXXXXXXXXXXXXXX---------------", "XXXXX----------XXXXXXXXXXXXXXXXXXXX---------------", "XXXXX-----XXXXX----------XXXXXXXXXXXXXXX----------", "XXXXX-----XXXXX----------XXXXXXXXXXXXXXX----------", "XXXXX-----XXXXX----------XXXXXXXXXXXXXXX----------", "XXXXX-----XXXXX----------XXXXXXXXXXXXXXX----------", "XXXXX-----XXXXX----------XXXXXXXXXXXXXXX----------", "--------------------XXXXX-------------------------", "--------------------XXXXX-------------------------", "--------------------XXXXX-------------------------", "--------------------XXXXX-------------------------", "--------------------XXXXX-------------------------", "XXXXXXXXXXXXXXXXXXXX----------XXXXXXXXXXXXXXX-----", "XXXXXXXXXXXXXXXXXXXX----------XXXXXXXXXXXXXXX-----", "XXXXXXXXXXXXXXXXXXXX----------XXXXXXXXXXXXXXX-----", "XXXXXXXXXXXXXXXXXXXX----------XXXXXXXXXXXXXXX-----", "XXXXXXXXXXXXXXXXXXXX----------XXXXXXXXXXXXXXX-----", "-----XXXXXXXXXXXXXXX------------------------------", "-----XXXXXXXXXXXXXXX------------------------------", "-----XXXXXXXXXXXXXXX------------------------------", "-----XXXXXXXXXXXXXXX------------------------------", "-----XXXXXXXXXXXXXXX------------------------------" }

This problem statement is the exclusive and proprietary property of Topcoder, Inc. Any unauthorized use or reproduction of this information without the prior written consent of Topcoder, Inc. is strictly prohibited. (c)2024, Topcoder, Inc. All rights reserved.