Gantt Chart Class: Generate project progress Gantt charts

This class can be used to generate project planning and progress report Gantt charts.

It takes all the definitions of the chart details from associative arrays that are passed to the class constructor function.

The class supports the definition of details of project task groups, initial planned work, adjusted plan, real work done, progress (percentage done), milestones (products/objectives) and legend.

Several chart presentation details can be configured like the colors, row height, block height of blocks, where the blocks begin, text fonts, locale date formatting, legend titles, graphic scale (day, week or month), transparency of bars, lines (dependency) and icon (milestones).

The chart graphics are rendered using the PHP GD library functions. The charts are by default outputted in the PNG format, but can be also gif ou jpeg and saved to a file.