Difference between revisions of "Ruby:Programming Tutorial"

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(An Example: drawing the French tricolour)
Line 24: Line 24:
 
end
 
end
 
</prog>
 
</prog>
<answer>
 
image.draw do |g|
 
  g.color = image.palette.resolve Color[0,0,1.0]
 
  g.rectangle(0,0,50,100,filled=true)
 
  g.color = image.palette.resolve Color[1.0,1.0,1.0]
 
  g.rectangle(50,0,100,100,filled=true)
 
  g.color = image.palette.resolve Color[1.0,0,0]
 
  g.rectangle(100,0,150,100,filled=true)
 
end
 
</answer>
 
 
</question>
 
</question>
  

Revision as of 18:32, 15 April 2008

An introduction to computer programming using Ruby. Comprising

An Example: drawing the French tricolour

You can create images using the GD2 library. The first tutorial Flags looks at drawing flags of the world, from simple flags such as Libya to more complicated flags such as the Stars and Stripes of the USA.

With GD2 you can set the canvas color and draw a rectangle to create simple images.

Flag guide france.png

Notice that the blue rectangle has corners at (0,0) and (50,100) and has color [1,0,0]

g.color = image.palette.resolve Color[1.0, 0, 0]
g.rectangle(0,0,50,100,filled=true)


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