Bitmap editor

Produces bitmaps represented as an M x N matrix of pixels with each element representing a colour.

Commands

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

Running

>bin/bitmap_editor examples/show.txt

Sample

Input: examples/show.txt

I 10 10
V 4 1 10 T
V 5 1 10 T
V 6 1 10 T
H 1 10 4 Z
H 1 10 5 Z
H 1 10 6 Z
L 5 5 A
S

Output:

OOOTTTOOOO
OOOTTTOOOO
OOOTTTOOOO
ZZZZZZZZZZ
ZZZZAZZZZZ
ZZZZZZZZZZ
OOOTTTOOOO
OOOTTTOOOO
OOOTTTOOOO
OOOTTTOOOO

Test

>rspec --format doc