wsams/ruby-graph

An experiment in graphing equations using pure Ruby.

ruby-graph

An experiment in graphing equations using pure Ruby.

Usage

To graph, for example, y = x^2, setup a RubyGraph object and call the graph method.

rg = RubyGraph.new
rg.x_pos_offset = 20
rg.x_neg_offset = 20
rg.y_pos_offset = 200
rg.y_neg_offset = 20
rg.out_file = "graph.png"
rg.graph { |x| (x ** 2).round }

This will output a PNG file just like the following.

ruby-graph's Issues

Implement precision

Currently each pixel of the image represents a whole integer on the x-y plane.

With precision we will be able to zoom in and out of graphs. One example where this will be extremely useful is graphing sine and cosine.

Filling doesn't work for negative Y values

For example rg.graph { |x| (x - (x ** 2)).round }

This is a parabola pointing downward. It only plots the points.