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bitmap_editor's Introduction

Bitmap editor

A Ruby 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.

There are 7 supported 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).

F X Y C - Magic fill - colours a given pixel and all same-coloured pixels near it until it reaches a pixel with a different colour.

S - Show the contents of the current image

..

Running

>bin/bitmap_editor examples/show.txt

Testing

Use rspec to run tests:

$ rspec

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