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Life & fun · November 25, 2013

lsys - realtime lsystems on canvas

lsys - realtime lsystems on canvas launched on November 25, 2013 with 5 votes, #228 of 701 launches that month and more than 50% of that year's launches. The site was still online in September 2026, 12 years on.

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What it does

Welcome to lsys - the brainchild of a curious programmer with questionable taste in design. The pattern on the right is an l-system , and it's interactive. As you drag your mouse, you change the parameters of the system, which then gets redrawn. The rules are used to generate a sequence of drawing instructions. For example, 'F' means 'draw forwards', and '+' means rotate right. We've defined a rule, called S, for "square". It really doesn't matter what we call it, but it must be precisely one character Instead, let's make the S rule recursive. Now, we draw forwards, rotate right, then do 'S' again. We define a new rule A, which does a S(quare), then rotates right, and does an A again. The…from benvan.co.uk

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