Produce a Ruby 2.3 program that simulates a basic interactive bitmap editor. Bitmaps are represented as an M x N matrix of pixels with each element representing a colour.
The input consists of a file containing a sequence of commands, where a command is represented by a single capital letter at the beginning of the line. Parameters of the command are separated by white spaces and they follow the command character.
Pixel co-ordinates are a pair of integers: a column number between 1 and 250, and a row number between 1 and 250. Bitmaps starts at coordinates 1,1. Colours are specified by capital letters.
There are 6 supported commands.
| Commands | Description |
|---|---|
I M N |
Create a new M x N image with all pixels coloured white (O). |
C |
Clears the table, setting all pixels to white (O). |
L X Y C |
Colours the pixel (X,Y) with colour C. |
V X Y1 Y2 C |
Draw a vertical segment of colour C in column X between rows Y1 and Y2 (inclusive). |
H X1 X2 Y C |
Draw a horizontal segment of colour C in row Y between columns X1 and X2 (inclusive). |
S |
Show the contents of the current image |
To run the application you must supply a command file like so bin/bitmap_editor examples/show.txt
I 5 6
L 1 3 A
V 2 3 6 W
H 3 5 2 Z
S
OOOOO
OOZZZ
AWOOO
OWOOO
OWOOO
OWOOO
>bin/bitmap_editor examples/show.txt
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