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资源说明：A OOP matrix class in Ruby
Graphical editors allow users to edit images in the same way text editors let us modify documents. Images are represented as an M x N array of pixels with each pixel given colour. Produce a program that simulates a simple interactive graphical editor. Input ===== The input consists of a line containing a sequence of commands. Each command is represented by a single capital letter at the start of the line. Arguments to the command are separated by spaces and follow the command character. Pixel co-ordinates are represented by a pair of integers: 1) a column number between 1 and M, and 2) a row number between 1 and N. Where 1 <= M, N <= 250. The origin sits in the upper-left of the table. Colours are specified by capital letters. Commands ======== The editor supports 7 commands: 1. I M N. Create a new M x N image with all pixels coloured white (O). 2. C. Clears the table, setting all pixels to white (O). 3. L X Y C. Colours the pixel (X,Y) with colour C. 4. V X Y1 Y2 C. Draw a vertical segment of colour C in column X between rows Y1 and Y2 (inclusive). 5. H X1 X2 Y C. Draw a horizontal segment of colour C in row Y between columns X1 and X2 (inclusive). 6. 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. 7. S. Show the contents of the current image 8. X. Terminate the session Example ======= In the example below, > denotes input, => denotes program output:: >I 5 6 >L 2 3 A >S => OOOOO OOOOO OAOOO OOOOO OOOOO OOOOO >F33J >V234W >H342Z >S => JJJJJ JJZZJ JWJJJ JWJJJ JJJJJ JJJJJ Install ======= run the following: ruby main.rb Note. The library is not imported correctly so you might need to adapt the path The algorithm implements Flood-Filling in Ruby, examples taken from Rosetta code Bibliography ============ * http://en.wikipedia.org/wiki/Connected-component_labeling * http://www.cse.msu.edu/~stockman/Book/2002/Chapters/ch3.pdf * Rosetta code (somewhat lacunary yet very inspiring): http://rosettacode.org/wiki/Bitmap/Flood_fill#Ruby * http://en.wikipedia.org/wiki/Flood_fill
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