JetChart - A Java Chart Library

The JetChart Library is currently at version 3.0. Some of JetChart features are listed below, followed by an example. Click on the small window image to pop up a window showing a screenshot.


Supports JDK 1.1 and newer versions.

Charts can be dynamically dragged and resized.

Vertical and horizontal orientation.

Gradient colors effect on the background.

Antialiased images. Primitive graphics as lines, circles, rectangles, etc., have jagged edges by default, generating what is called 'aliased' images. It is possible, however, to significantly reduce the jagged effect enabling 'antialiasing', a technique already available since Java version 1.2.

A background image can be displayed on the chart background.

Tooltips. When mouse cursor hovers over a data point a small window pops up displaying respective value.

Series tooltips displayed simultaneously. By default tooltips are displayed one at a time, next to the xy coordinates of each data point. If multiple tooltips are enabled and two or more series are shown, the tooltips are simultaneously displayed, vertically or horizontally aligned with the labels coordinates, depending on chart orientation.

Multiple legend boxes.

Supports 2D/3D charts.

Draggable legend box. Chart legend can be dragged to the left, right or bottom position.

Pluggable series. Series are implemented as individual classes, making it easier to combine different types of series in one single chart.

The x axis, y axis, chart legend, grid and scale are also implemented as individual classes.

Scale labels can be customized.

Supports positive and negative numbers.

Supports the following types of series: Line series Bar series Stacked bar series Point series Area series Image series Vector series OHLC/HLC bar series OHLC/HLC line series CandleStick series Pie series XY series XY bar series XY line series XY image series Bubble series Polar point series Polar line series Polar area series Polar image series Polar bubble series Gauge series Radar point series Radar line series Radar area series OHLC/HLC series are used for analysis of financial market data.

A pie chart can be dynamically rotated and pie slices can be exploded using mouse.

Slice legends can be shown outside the pie chart area and stacked to the left and right sides, in order to avoid overlapping.

Date labels can be automatically displayed informing a starting date and optionally the date increment type(daily, weekly, monthly or yearly increment).

Automatic generation of month labels. A chart displaying date labels can be configured to display only the month name at the position of each first month day label.

Control over the sequence of labels displayed, defining a step value or setting the visibility status of each label.

Data points of most series can be partially hidden, resulting in gaps being displayed, either by using a class method to specify the visibility status or passing NaN values to a series.

Labels are automatically hidden to prevent them from overlapping each other.

Vertical labels are supported.

Scale values can be manually set(minimum, maximum and increment values are customizable).

Event-driven series. When mouse cursor hovers over a data point, or a data point is clicked/dragged, a special event containing information about the data point is dispatched to registered listeners.

Series highlight. A data point color changes when mouse cursor hovers over it.

Transparent and opaque annotations can be dropped onto the chart area and dragged.

Double axis. A vertical chart can display two vertical axis, positioned to the left and right sides of the chart area. Each of the vertical axis can display an unlimited number of scales.

Total control over scale positioning along the left or the right axis, in vertical charts. Scales are assigned a start and end points, which are fully customizable.

Multiple scales. An unlimited number of scales can be displayed along the left, right or both vertical axis. Series can be grouped and plotted against different scales, simultaneously.

Multiline labels and multiline legend. Labels and series legends can be vertically split into two or more strings using the line-feed character(\n).

The legend box supports multiple rows. Should a horizontal legend box advances beyond the right and left margins, series legends can be arranged into two or more rows, within the chart area.

Automatic adjustment of the legend box dimensions and layout to prevent it from advancing beyond the chart margins.

Time series, using scatter charts. A scatter chart can accept a sequence of milliseconds values or timestamp strings and treat them as a date sequence.

Scrolling label. 2D vertical charts can display a scrolling label at two different places. The scrolling label follows the movement of the mouse cursor across the chart area. It is particularly useful for showing hidden labels in charts displaying long series of data.

Scrolling bar. 2D horizontal and vertical charts can display a scrolling bar to help identify series data points. The scrolling bar follows the movement of the mouse cursor across the chart area. A scrolling bar cuts a data point at its label coordinate.

Charts can be encoded into a GIF, JPEG, PNG byte stream and saved to a file.

SVG(Scalable Vector Graphics) encoding is also supported, including URL drill-down on SVG images and SVG tooltips.

Series mapping. A series map is a sequence of coordinates representing a series data points, which can be embedded into html code as a chart image map. JetChart maps series using three different approaches to generate a client-side map, a server-side NCSA or CERN formatted map. In conjunction with GIF, JPEG or PNG encoding, it is possible to implement drill-down by generating series maps with servlets.

Chart zooming. A chart area can be selected and zoomed.

Logarithmic scales are supported.

Target lines, which are straight lines painted across the chart area representing a goal to achieve or a threshold point to be avoided.

Dashed lines. Line series, grids and linear regression lines can be defined as solid or dashed.

XML-aware charts. Chart data can be loaded from an XML-formatted source.

Linear regression lines.

Target zones. A target zone is a color filled polygon painted across the chart area, and it is used to compare series values against a delimited area.

Labels zones, to delimit areas between labels.