The IlvChart bean

Property	Description	Default value
xGridVisible	Controls the abscissa grid visibility	true
yGridVisible	Controls the ordinate grid visibility	true
header	The text to display on top of the chart area	empty
footer	The text to display at the bottom of the chart area	empty
antiAliasing	Controls the anti-aliasing mode inside the chart area	false
antiAliasingText	Controls the anti-aliasing mode of text inside the chart area	false
chartAreaBorder	The border to set on the chart area component	null
plotAreaBackground	The background color of the plot area	white

Grid visibility

The xGridVisible and yGridVisible properties indicate whether the abscissa grid or the ordinate grid should be drawn. A grid is drawn below the graphical representations of the data, and match the major steps location of their associated scale. By default, both grids are visible.

Grid Visibility shows a chart with a hidden abscissa grid, and a visible ordinate grid:

Grid Visibility

Header and footer text

The header and footer properties indicate that a text can be displayed on top of the chart area, and at the bottom of the chart area, respectively. This string can be expressed as simple text or as HTML text. By default, these properties are set to an empty string.

Header and Footer shows a chart with the header property set to “The main Title” and the footer property set to “A subtitle”:

Header and Footer

Anti-aliasing modes

The anti-aliasing mechanism allows you to have a nice display rendering by reducing stair effects on the display area. The IlvChart bean supports two anti-aliasing modes by means of two properties:

antiAliasing

Controls the rendering quality of all the drawings performed within the chart area, except text drawings.

antiAliasingText

Controls the rendering quality of all the text drawings performed within the chart area.

Since the anti-aliasing mechanism may be a time-consuming process, both modes are disabled by default.

Anti-aliasing shows two charts: the first one has the antiAliasing property set to false, the second one has the antiAliasing property set to true:

Anti-aliasing

Chart area border

The IlvChart bean allows you to apply a javax.swing.Border instance of the chart area component by means of the chartAreaBorder property. By default, no border is set.

A Line Border Instance shows a chart area with a LineBorder instance:

A Line Border Instance

Plotting area background

The plotting area is defined as the region where data is projected and displayed. The bounds of this rectangle are computed according to the drawing rectangle (the chart area bounds minus its internal insets) and the chart area internal margins.

The plotAreaBackground property describes the background color of this plotting rectangle, and is set to white by default.

Plotting Area Background shows two charts with a plotting area background color set to "255, 245, 235":

Plotting Area Background

Legend properties

Property	Description	Default value
legendVisible	Controls the legend visibility.	false
legendPosition	Controls the legend position within the chart.	North

Legend visibility

The IlvChart bean may be associated with a legend to display information about the drawn data. When this legend is enabled, all the graphical representations displayed within the chart have a corresponding legend item.

The legend is activated by means of the legendVisibility property, and is disabled by default.

Legend position

The chart legend is displayed at predefined positions within the chart around the chart area. These anchor positions are defined relative to the chart area, and the possible values are: North, North West, West, South West, South, South East, East, and North East.

The legend anchor position is defined by the legendPosition property, and is set to North by default.

Legend shows a chart with a legendVisible property set to true and the legendPosition property set to North:

Legend

Axis properties

Property	Description	Default Value
projectorReversed	Controls the projector configuration	false
xAxisReversed	Controls the abscissa axis orientation	false
yAxisReversed	Controls the ordinate axis orientation	false

Axis configuration

The IlvChart beans allow you to customize the chart axis configuration by means of three different properties that work together to define the coordinate system configuration:

projectorReversed

Allows you to change the meaning of the abscissa and ordinate coordinates of a point. For example, a reversed Cartesian projector will project x-data values along the y-axis of the screen.

xAxisReversed

Allows you to change the orientation of the x-axis.

yAxisReversed

Allows you to change the orientation of the y-axis.

The combination of these three properties determines the full configuration of the chart coordinate system.

Axis shows the possible configurations and their results:

Axis

Scale properties

Property	Description	Default value
xScaleVisible	Controls the abscissa scale visibility	true
yScaleVisible	Controls the ordinate scale visibility	true
xScaleTitle	Defines the abscissa scale title	none
yScaleTitle	Defines the ordinate scale title	none
xScaleTitleRotation	Defines the abscissa scale title rotation	0
yScaleTitleRotation	Defines the ordinate scale title rotation	0

Scales visibility

A scale is defined as the graphical representation of an axis. Scale objects are directly handled by the IlvChart bean that creates one scale per axis.

The visibility of the chart scales is controlled by means of the xScaleVisible and yScaleVisible properties. By default, both x- and y-scales are visible.

Scales Visibility shows a chart with the hidden scales:

Scales Visibility

Scales title

The IlvChart bean allows you to associate a title with each scale of the chart. A scale title is defined by the following elements:

the text

Displayed through the xScaleTitle and yScaleTitle properties that are initialized to an empty string by default.

a rotation angle

Defined through the xScaleTitleRotation and yScaleTitleRotation properties that are initialized to 0.

Scales Title shows a chart with the xScaleTitle property set to “X Scale”, the yScaleTitle set to “Y Scale”, and the yScaleTitleRotation property set to -90:

Scales Title

Graphical representation properties

Property	Description	Default value
type	Defines the chart type	Cartesian
renderingType	Defines the type of the graphical representation of a data model	Polyline

To determine how a data model is rendered on the screen, the IlvChart beans define the following two properties:

type

Determines how data is projected (using either a Cartesian or polar projection). The possible values are: Cartesian, Polar, Radar, and Pie.

Chart Types shows the possible values of the type property:

Chart Types

renderingType

defines the graphical representation of a data model (as polylines, bars, stairs, and so on.). The possible values are: Bar, Stacked Bar, SuperimposedBar, Area, Stacked Area, Polyline, Scatter, Stair, and Pie.

NOTE The Pie Renderer type is essentially used with a Pie chart.

Renderers shows the Cartesian charts with the different graphical representations:

Renderers

Interaction Properties

Property	Description	Default value
interactors	Defines the possible interactions that are handled by this chart bean	none
xScrollBar	Defines the scroll bar associated with the x-axis	none

Interactor properties

The JViews Charts library provides a built-in mechanism to handle the user’s interactions on an IlvChart bean. User’s interactions are performed by means of objects called interactors.

The interactors define atomic behaviors (like zooming or panning) that can be combined to achieve complex interactions.

Interactors are handled by an IlvChart bean by means of the interactors property, defined as an array of interactors.

The predefined interactors available to the IlvChart bean are: Zoom, Information-View, Pan, Highlight-Point, X-Scroll, Y-Scroll, Edit-Point, Action, and 3DView.

For more information on these interactors, you can refer to Interacting With Charts.

xScrollBar property

The xScrollBar property allows you to connect a JScrollBar object to the x-axis of an IlvChart bean. Once connected to an IlvChart bean, the scroll bar is able to scroll the visible range of the chart, and is updated following any modifications of the visible range.

Data properties

You can import data in an IlvChart by means of a data source. A data source is an object that holds the data sets to be displayed in a chart. An IlvChart bean is connected to a data model through its data source property.

You can find more information on the data model architecture in Using the Data Model.