A personal project: function grapher

[LAPB]

First since this is my first post: Hello! community of phpbuilder.com
Since a while i wanted to program a function grapher: given a string representing a (2D) function draw its corresponding graph and i divided this in 2 problems: 1) parsing the string into computable data and 2) drawing the function.
i have an idea of how i would go about doing 2): with GD so that leaves me with the question: where can i find a parsing library to suit my needs?

Thanks for your attention.

[Derokorian]

Hello and Welcome to PHPBuilder.com!

The only good graphing library I know of is http://graphpite.sourceforge.net/ which is actually pretty amazing. Hope it helps.

[LAPB]

so i thought i could approach the drawing problem first this is the code that i wrote.

as you can see although the graph is mathematically right... its nowhere near the actual quality of a real function graph

which leads me to think
1) i could be doing something better (like plotting the function on a range)
or
2) GD isnt the right library to draw such graphics

[Weedpacket]

Regarding (2); [man]Cairo[/man] would probably provide better quality.