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### 3.3.1 Plot extension modules

To add plots to the graph you will need one or more of the following files plot extension files depending on what kind of graph you need to create.

- jpgraph_log.php, Plot extension to support logarithmic X and Y scales
- jpgraph_line.php, Plot extension. Needed to draw various line plots
- jpgraph_date.php, Plot extension to handle date scales.
- jpgraph_bar.php, Plot extension. Needed to draw various bar plots
- jpgraph_error.php, Plot extension. Needed to draw various error plots
- jpgraph_scatter.php, Plot extension. Needed to draw scatter and impulse plots.
- jpgraph_spider.php, Plot extension. Needed to draw spider plots.
- jpgraph_pie.php, Plot extension. Needed to draw Pie plots
- jpgraph_pie3d.php, Plot extension. Needed to draw 3D Pie plots
- jpgraph_gantt.php, Plot extension. Needed to create gantt plots
- jpgraph_radar.php, Plot extension. Needed for radar plots
- jpgraph_polar.php, Plot extension. Needed for Polar plots
- jpgraph_gantt.php, Plot extension. Needed for Gantt charts
- jpgraph_regstat.php, Statistic extension. Needed to plot spline and bezier curves
- jpgraph_stock.php, Plot extension. Needed to plot stock charts
- jpgraph_antispam.php, Special extension to generate anti-spam images consisting of letters+images which are very hard to digitally read with an OCR program
- jpgraph_gradient.php, Internal module. Contains all color gradient
- jpgraph_gb2312.php, Handling of gb2312 font encoding (used for some Chinese fonts)
- jpgraph_plotmark.inc, Handling of plotmarks in line and scatter plot.
- jpgraph_iconplot.php, Handling icons (small images) that can be added to the plots
- jpgraph_plotband.php, Handling of plotbands added to the graphs
- jpgraph_flags.php, Handling of country flags used as plot marks or as backgrounds.
- jpgraph_utils.php, Various utility function
- imgdata_*.inc, Encoded images for plotmarks
- flags*.dat, Image data for flags. Pre-compiled data for country flags.
- jpgraph_canvas.php, Plot extension to make it possible to draw arbitrary graphic on a canvas.
- jpgraph_canvtools.php, Add on to the canvas graph to provide an easier way to draw arbitrary shapes.

In the pro-version the following additional files are available

- jpgraph_windrose.php, Windrose plot extension
- jpgraph_odo.php, Odometer plot extension
- jpgraph_barcode.php, Linear barcode extension
- jpgraph_pdf417.php, PDF417 2-Dimensional Barcode extension

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