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J4L Chart 2.1 for Ruby
Introduction
Features
Examples
User Guide
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License
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Other versions
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Features

J4L-Chart can create more than 18 types of charts:

- Linechart
- Areachart 

- Piechart

- Max.Min chart

- OHLC Chart

- Bubblechart 

- Event chart
- Barchart
- Columnchart

- Stacked barchart

- Candlestick chart

- Scatter chart

- Radarchart 

- Curve chart (interpolation)
- B-Splines (approximation) 

- Least Squares Lines

- Piechart 3D

- Linechart 3D

- Barchart 3D


... Combinations of them ....

The main features:

- Markup Language for labels
- Any number of axis
- target zones in chart and axis

- Notes
- Configuration of
fonts, color, styles, layout ...
- More than 75 named colors and RGB support.

- It can export to gif , jpg and png
- line with width and style

- Right/Left Y Axis
- Rotated labels

- Automatic scales/ticks
- Logarithmic scale

- Date/time based scales
- Automatic date labels 
- Transparent fillings

- Non continuous lines (null values)
- Background images and points

- Grids
- Position of legend
- X scale on top

... and more....