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bitrunner

A Bitmap Editor exercise written in Ruby.

Exercise

Write a program that simulates a basic interactive bitmap editor. A bitmap is represented as with a M x N matrix of pixels with each element representing a colour.

Program input

The input consists of the user inputting a command per line, where a command is represented by a single capital letter at the beginning of each line.

  • Parameters of the command are separated by white spaces and they follow the command character.
  • Pixel coordinates 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.

Example

The application should behave like a REPL, you start the application by writing in the terminal ./bitrunner.

When implementing this program focus on quality and best practices. Make sure the program works with odd input and doesn't crash.

In the example below, > represents each line of the program command line.

$ ./bitrunner

> I 5 6
> L 2 3 A
> S
O O O O O
O O O O O
O O O O O
O O A O O
O O O O O
O O O O O

> F 3 3 J
> V 2 3 4 W
> H 3 4 2 Z
> S
J J J J J
J J J J J
J J J Z Z
J J W J J
J J W J J
J J J J J
> X

How to run?

You will need at least ruby version 2.7.2 to run this program.

$ bundle
$ ./bitrunner

How to run the tests

$ bundle
$ bundle exec rspec

Commands

Command Description
I M N Create a new M x N bitmap with all pixels coloured white (O)
C Clears the bitmap, 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).
F X Y C Fill the region R with the colour C. R is defined as: Pixel (X,Y) belongs to R. Any other pixel which is the same colour as (X,Y) and shares a common side with any pixel in R also belongs to this region.
S Show the contents of the current image
X Terminate the session
? Shows in program help

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maps with bits and bits with maps running in ruby

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