com.sas.graphics.components.lineplot
Class LinePlot

com.sas.graphics.components.lineplot.LinePlot

All Implemented Interfaces:

java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable

public class LinePlot

The LinePlot component is a Swing component that produces line plots that support the visualization of multiple response variables. Line plots show the relationship of one variable to another.

When generating a graph, a LinePlot does not summarize the data from a LinePlotTableDataModel.

Note. A LinePlot is typically used to plot scientific data with X and Y variables that have continuous values. For generating more business-oriented graphs that plot response values against discrete categorical values, the LineChart is better suited than the LinePlot.

A LinePlot is similar to a ScatterPlot and differs as follows:

• The defaults of a LinePlot are set to connect plot points with an interpolated line. The defaults of a ScatterPlot are set for displaying plot points with no interpolation lines. (Only the defaults differ; either plot can enable or disable the display of plot markers or interpolated lines.)
• A ScatterPlot can use a Size variable to set the size of plot markers. The Size variable is useful for producing Bubble plots. A LinePlot cannot use a Size variable and cannot produce Bubble plots.

Note. This class can be used to render client-side graphs in Java applications or applets. The com.sas.servlet.tbeans.graphics.html.LinePlot class can be used to render server-side graphs in Java servlets or JavaServer Pages (JSP). Both classes use the models in the com.sas.graphics.components package.

Topics:

Minimum Specification
Functional Overview
Data Access
Display Properties
Titles and Footnotes
Usage Examples
Behavior

Swing-based Samples

Since:

SAS 9.1

See Also:

Variable, VariableList, PlotVariable, PlotVariableList, ClassificationVariable, ClassificationVariableList, LinePlotModel, LinePlotDataModel, LinePlotTableDataModel, LinePlotOLAPDataModel, Serialized Form

Field Summary

static java.lang.String	RB_KEY
protected java.awt.event.MouseListener	scrollBarListener

Fields inherited from class com.sas.graphics.components.Graph

footnoteContainer, titleContainer

Constructor Summary

LinePlot()
Construct a LinePlot using the default GraphStyle (GraphStyle.STYLE_CONVENTION).

LinePlot(LinePlotDataModel linePlotDataModel)
Construct a LinePlot, assigning linePlotDataModel, and using the default GraphStyle (GraphStyle.STYLE_CONVENTION).

LinePlot(LinePlotDataModel linePlotDataModel, GraphStyle defaultGraphStyle)
Construct a LinePlot assigning linePlotDataModel and applying graphStyle.

Method Summary

void	applyColorScheme(ColorScheme scheme) Apply a color scheme on this Graph.
protected void	applyDataModel() Intended for internalUse only
protected void	applyGraphModel() For internal use only.
void	applyGraphStyle(GraphStyle graphStyle) Apply the GraphStyle display properties onto the LinePlot.
LinePlotDataModel	getDataModel() Returns the LinePlotDataModel that contains the data along with any associated mapping properties.
static com.sas.beans.ExtendedBeanInfo	getExtendedBeanInfo() Returns information used by the com.sas.beans.Introspector to augment the automatically introspected information about this LinePlot.
LinePlotModel	getGraphModel() Returns the LinePlotModel that encapsulates most of the LinePlot's display properties.
PlotImageMapInfo	getImageMapInfo() The PlotImageMapInfo class encapsulates the mapping of regions associated with marker and line elements, labels (for both axes and legends) and values (for both axes and legends) as projected onto the display area along with their associated data.
boolean	isAnimationEnabled()
boolean	isAutoRepaintEnabled() Returns whether or not the graph automatically repaints when any of its properties (contained in associated models GraphModel, DataModel, NoteModel, etc) has changed.
void	prepareToPaint() Notify this component that an application is about to call paint directly.
protected void	selectionChanged() Internal use only.
void	setAnimationEnabled(boolean enabled)
void	setAutoRepaintEnabled(boolean b) Sets whether or not the graph automatically repaints when any of its properties (contained in associated models GraphModel, DataModel, NoteModel, etc) has changed.
void	setDataModel(LinePlotDataModel newDataModel) Sets the LinePlotDataModel which provides the data properties along with any associated mapping properties to define the number and arrangement of data elements (markers and lines), legends and axes.
void	setDisplayPolicy(int newDisplayPolicy) Set how the graph is to utilize the display area.
void	setGraphModel(LinePlotModel newLinePlotModel) Sets a LinePlotModel to define most of the LinePlot's display properties.
void	setLocale(java.util.Locale locale) Sets the locale of this component.
protected void	updateDataModelListeners() Internal use only.

Methods inherited from class com.sas.graphics.components.Graph

addActionListener, addMouseListener, addMouseMotionListener, addMouseMotionListener, clearSelection, firePropertyChange, getActionProvider, getAppliedColorSchemeName, getAppliedGraphStyleName, getBackground, getBrushBounds, getChannel, getContentsChangedListener, getDefaultGraphStyle, getDefaultHeight, getDefaultWidth, getDisplayPolicy, getFooter, getFootnote, getFootnote1, getFootnote2, getHeader, getListSelectionListener, getLocale, getMessageModel, getMinimumSize, getPreferredSize, getTableModelListener, getTitle, getTitle1, getTitle2, getTitle3, getTitle4, isAppliedGraphStyleModified, paint, paintAll, paintBackground, pick, pick, pickSelected, removeActionListener, select, select, select, select, setActionProvider, setBackground, setBounds, setFooter, setFootnote, setFootnote1, setFootnote2, setHeader, setMessageModel, setPaintContext, setTitle, setTitle1, setTitle2, setTitle3, setTitle4, update, updateDataModelListeners, validateTree

Field Detail

RB_KEY

public static final java.lang.String RB_KEY

See Also:

Constant Field Values

scrollBarListener

protected java.awt.event.MouseListener scrollBarListener

Constructor Detail

LinePlot

public LinePlot()

Construct a LinePlot using the default GraphStyle (GraphStyle.STYLE_CONVENTION).

See Also:

GraphStyle

LinePlot

public LinePlot(LinePlotDataModel linePlotDataModel)

Construct a LinePlot, assigning linePlotDataModel, and using the default GraphStyle (GraphStyle.STYLE_CONVENTION). The LinePlotDataModel is accessible via the getDataModel method.

A null LinePlotDataModel parameter is equivalent to using the default constructor.

Parameters:

linePlotDataModel - the data to be used by this graph

See Also:

GraphStyle, LinePlotTableDataModel, LinePlotOLAPDataModel

LinePlot

public LinePlot(LinePlotDataModel linePlotDataModel,
                GraphStyle defaultGraphStyle)

Construct a LinePlot assigning linePlotDataModel and applying graphStyle. The LinePlotDataModel is accessible via the getDataModel method. The LinePlotModel (whose properties are affected by the GraphStyle application) is accessible via the getGraphModel method. The NoteModels (whose properties are affected by the GraphStyle application) are accessible via the getTitle and getFootnote methods. A null LinePlotDataModel parameter is equivalent to setDataModel(null); If graphStyle is null then GraphStyle.STYLE_CONVENTION will be applied.

Parameters:

linePlotDataModel - provides a data handle with associated mapping properties

defaultGraphStyle - the set of graph display properties

See Also:

NoteModel, LinePlotModel, LinePlotTableDataModel, LinePlotOLAPDataModel

Method Detail

setAnimationEnabled

public void setAnimationEnabled(boolean enabled)

isAnimationEnabled

public boolean isAnimationEnabled()

setDisplayPolicy

public void setDisplayPolicy(int newDisplayPolicy)
                      throws java.lang.IllegalArgumentException

Set how the graph is to utilize the display area. The graph will always utilize all the display area supplied to it however there are occasions when the display area provided to the graph is less than optimal size to draw the graph well. Various factors can contribute to this including font selection, data assignments, number of data observations, the type of graph, wheter or not legends are displayed, etc.

On the occasion when insufficient display area is available, the graph has to decide whether to use scroll bars and only display a portion of the graph or to draw the entire graph into the available space (shrinking and adjusting portions of the graph as best it can).

To allow scroll bars use the GraphConstants.DISPLAY_SCROLL_AS_NEEDED or specify GraphConstants.DISPLAY_FIT_TO_SCREEN to force the entire graph into the available display area. Specify GraphConstants.DISPLAY_SCROLL_ENABLED shows zoom scrollbars which appear when the display area is moused over and the chart is forced to show the entire graph in the available display area, however the use can then zoom and scroll to investigate the data further.

The default value is GraphConstants.DISPLAY_AUTOMATIC. Valid values are:
GraphConstants.DISPLAY_FIT_TO_SCREEN GraphConstants.DISPLAY_SCROLL_AS_NEEDED GraphConstants.DISPLAY_SCROLL_ENABLED: GraphConstants.DISPLAY_AUTOMATIC:

Overrides:

setDisplayPolicy in class Graph

Parameters:

newDisplayPolicy - how the Graph should utilize the dislay area

Throws:

java.lang.IllegalArgumentException - if newDisplayPolicy is invalid.

See Also:

Graph.getDisplayPolicy()

prepareToPaint

public void prepareToPaint()

Notify this component that an application is about to call paint directly. This method is useful when attempting to get the Graph to draw into an image (or other application provided GraphicsContext).

As per java standard practices; "paint" should never be called directly by an application. However if it is necessary to render the Graph directly then the use of paintAll(Graphics) or printAll(Graphics) is acceptable.

Graphs asynchronously update to keep their view in sync with their model properties (Graphmodel, DataModel, NoteModel etc.). A direct call to paintAll or printAll does not allow for the graph to asynchronously sync up with their model proeprties. prepareToPaint provides this synchronization point necessary for the Graphs to update their component structure as needed.

Note: Used in a headless environment, Graphs will never asynchronously update and therefore require a call to prepareToPaint to render into a GraphicsContext.

The headless and non-headless cases can be handled slightly differently. In the non-headless case the asynchronous updating needs to be halted. This is done by setting the "autoRepaintEnabled" property to false. The default for autoRepaintEnabled is true, allowing the graph to automatically resync and repaint as model properties are modified.

Example writing to an image. Note for readability exception handling has been ignored.

 static public void main(String args[])
 {
    BufferedImage bi = new BufferedImage(640,480,BufferedImage.TYPE_INT_RGB);
    Graphics ig = bi.createGraphics();

    // Create Graph
    LinePlot graph = new LinePlot();
 
    // This call is not necessary if you are running in a headless environment.
    graph.setAutoRepaintEnabled(false);
    
    // ... assign data and model properties here ...
    graph.setDataModel(newGraphData());
    
    {// Render sequence
        graph.setBounds(0,0,bi.getWidth(null),bi.getHeight(null)); // Define the size of the Graph
        graph.addNotify(); // Makes the component displayable.
        graph.prepareToPaint(); // do property synchronization
        graph.paintAll(ig); // render into some graphics context
    }
 
    // Dispose of image graphics context
    ig.dispose();                
    
    // Save immage to disk
    File file = new File("graph.jpg");
    try
    {
        ImageIO.write(bi, "jpg", file);
    }
    catch (IOException e)
    {
        System.out.println("ImageIO.write failed.");
    }
 }
 

Specified by:

prepareToPaint in class Graph

setAutoRepaintEnabled

public void setAutoRepaintEnabled(boolean b)

Sets whether or not the graph automatically repaints when any of its properties (contained in associated models GraphModel, DataModel, NoteModel, etc) has changed. The default value is true.

The setting of this property to false implies that the application will be responsible for synchronizing the graph with its models using the prepareToPaint method.

This method was added to support rendering into an off screen graphics context such as an image.

Specified by:

setAutoRepaintEnabled in class Graph

Parameters:

b - true means to automatically update

See Also:

isAutoRepaintEnabled()

isAutoRepaintEnabled

public boolean isAutoRepaintEnabled()

Returns whether or not the graph automatically repaints when any of its properties (contained in associated models GraphModel, DataModel, NoteModel, etc) has changed.

Specified by:

isAutoRepaintEnabled in class Graph

See Also:

setAutoRepaintEnabled(boolean)

getExtendedBeanInfo

public static com.sas.beans.ExtendedBeanInfo getExtendedBeanInfo()

Returns information used by the com.sas.beans.Introspector to augment the automatically introspected information about this LinePlot.

Returns:

the ExtendedBeanInfo for this class

applyGraphStyle

public void applyGraphStyle(GraphStyle graphStyle)

Apply the GraphStyle display properties onto the LinePlot. The use of this method is a convenient way to quickly and easily affect the LinePlot's appearance. The LinePlotModel (accessible via the getGraphModel method) properties and the NoteModels (accessible via the getTitle and getFootnote methods) properties are modified by this method.

The GraphStyle enforces certain constraints that are not enforced on the Graph's display models (LinePlotModel and NoteModels). For example only one value text color may be specified on the GraphStyle, whereas the LinePlotModel supports setting different value text colors between axes, legends and data element text. Most presentations only require a single color for all types of value text, which is easily achieved by applying a GraphStyle.

Applying a GraphStyle will modify the display properties of the LinePlotModel and the title and footnote NoteModels. The LinePlot does not retain a link to the GraphStyle after this method has been called. Modifying any of the GraphStyle properties after this method has been called will have no affect on the LinePlot. Similarly modifying any of LinePlot's display properties after this method has been called will have no affect on the GraphStyle properties. To affect any change in the LinePlot display appearance the modified GraphStyle or a different GraphStyle would need to be applied again.

A blind PropertyChangeEvent is fired by the LinePlot after the apply is made.

No action is taken if a null GraphStyle is passed in.

Overrides:

applyGraphStyle in class Graph

Parameters:

graphStyle - the GraphStyle whose properties are conveyed to the LinePlot

See Also:

NoteModel, LinePlotModel

applyColorScheme

public void applyColorScheme(ColorScheme scheme)

Apply a color scheme on this Graph.

Overrides:

applyColorScheme in class Graph

Parameters:

scheme - ColorScheme object containing a set of colors for the charts.

setLocale

public void setLocale(java.util.Locale locale)

Sets the locale of this component. This is a bound property.

Overrides:

setLocale in class java.awt.Component

Parameters:

locale - the locale to become this component's locale

See Also:

Graph.getLocale()

setGraphModel

public void setGraphModel(LinePlotModel newLinePlotModel)
                   throws java.lang.IllegalArgumentException

Sets a LinePlotModel to define most of the LinePlot's display properties. Modifying any LinePlotModel property triggers the LinePlot to update. The update is asynchronous and delayed so modifying multiple properties in quick succession will result in only a single update. Use the FullPaintInterface if greater control over the LinePlot's paint behavior is necessary.

Typically applyGraphStyle is used to modify the graphs display properties.

Parameters:

newLinePlotModel - the LinePlotModel that encapsulates the LinePlot's display properties

Throws:

java.lang.IllegalArgumentException - if newLinePlotModel is null.

See Also:

getGraphModel(), LinePlotModel.apply(com.sas.graphics.components.lineplot.LinePlotModel), GraphStyle

getGraphModel

public LinePlotModel getGraphModel()

Returns the LinePlotModel that encapsulates most of the LinePlot's display properties.

Returns:

the LinePlotModel that encapsulates most of the LinePlot's display properties

See Also:

setGraphModel(com.sas.graphics.components.lineplot.LinePlotModel), LinePlotModel.apply(com.sas.graphics.components.lineplot.LinePlotModel)

setDataModel

public void setDataModel(LinePlotDataModel newDataModel)

Sets the LinePlotDataModel which provides the data properties along with any associated mapping properties to define the number and arrangement of data elements (markers and lines), legends and axes.

Any change in the LinePlotDataModel properties will cause the LinePlot to update. The update is asynchronous and delayed so modifying multiple properties in quick succession will result in only a single update. The FullPaintInterface can be used if greater control over the LinePlot's paint behavior is needed.

Note: Data value changes will also trigger LinePlot to update.

A valid LinePlotDataModel is required to draw a graph.

Parameters:

newDataModel - provides the data properties along with any associated mapping properties

See Also:

getDataModel(), LinePlotTableDataModel, LinePlotOLAPDataModel

getDataModel

public LinePlotDataModel getDataModel()

Returns the LinePlotDataModel that contains the data along with any associated mapping properties.

Returns:

the LinePlotDataModel that contains the data along with any associated mapping properties

See Also:

setDataModel(com.sas.graphics.components.lineplot.LinePlotDataModel), LinePlotTableDataModel, LinePlotOLAPDataModel

getImageMapInfo

public PlotImageMapInfo getImageMapInfo()

The PlotImageMapInfo class encapsulates the mapping of regions associated with marker and line elements, labels (for both axes and legends) and values (for both axes and legends) as projected onto the display area along with their associated data.

Returns:

the mapping of regions associated with marker and line elements, labels (for both axes and legends) and values (for both axes and legends) as projected onto the display area along with their associated data.

applyDataModel

protected void applyDataModel()

Description copied from class: Graph

Intended for internalUse only

Specified by:

applyDataModel in class Graph

applyGraphModel

protected void applyGraphModel()

For internal use only.

Overrides:

applyGraphModel in class Graph

selectionChanged

protected void selectionChanged()

Internal use only.

Specified by:

selectionChanged in class Graph

updateDataModelListeners

protected void updateDataModelListeners()

Internal use only.

Specified by:

updateDataModelListeners in class Graph

See Also:

Graph.updateDataModelListeners(Object model, Object selectionModel)