Stacked Bar Chart Class: Generate stacked bar chart images from data

This package contains four classes that generate images stacked bar chart in the PNG format.

There is no limit in terms of number chart elements that can be rendered in a chart.

The object oriented structure allows to add new classes that in conjunction with the main chart class may also draw pie, line or any other kind of charts.

Here follow a brief description of the different classes made available:

1. bar - draws a colored bar
2. serie - draw a set of values
3. grilla - draw the chart line grid with a given width and scale
4. chart - process parameter data and use the other classes to render the chart image

The GD library is required to generate the chart images.

The comments in the class are in Spanish.