Difference between revisions of "Ruby:Programming Tutorial"

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An introduction to computer programming using Ruby. Comprising
 
An introduction to computer programming using Ruby. Comprising
*[[Tutorials| Tutorials]] which present problems and their solutions.
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*[[ruby:Tutorials| Tutorials]] which present problems and their solutions.
*[[Guides| How to...]] guides to completing common tasks.
+
*[[ruby:Guides| How to...]] guides to completing common tasks.
*[[Assessments| Assessments]] graded problems with solutions.
+
*[[ruby:Assessments| Assessments]] graded problems with solutions.
 
==An Example: drawing the French tricolour ==
 
==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.
 
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.

Revision as of 00:35, 31 December 2007

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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