Line Chart Using Chart Engine API

cgswtsu78

Hello,

How do I change the actual color of the line in a line chart using the chart engine api? I would have thought the below code would have done it, but that just changes the markers on the line color and not the acutal lines color.

LineSeries ls1 = (LineSeries) LineSeriesImpl.create( );
ls1.getLineAttributes( ).setColor( ColorDefinitionImpl.BLUE());

Also, is there any way to show the marker value (the actual Y axis value) in some cases but not others? It looks like it's an always show or never show using the below. I have a bunch of 0 Y axis values and I don't want the 0 to show. I only want to show the value when it's not 0

ls1.getLabel( ).setVisible( false );

JasonW

Take a look at this example:
I use the setscript to make the labels conditional. Just change the condition.
I use the getPalette and getLineAttributes to set the colors.


public static final Chart createOverlayLine( )
{
ChartWithAxes cwaLine = ChartWithAxesImpl.create( );
cwaLine.setType( "Line Chart" ); //$NON-NLS-1$


//Script
cwaLine.setScript( "function beforeDrawDataPointLabel( dph, label, icsc )" +
"{"+
"if( dph.getOrthogonalValue() < 20 ){"+
"label.setVisible(false);"+
"}"+
"}");

// Plot
cwaLine.getBlock( ).setBackground( ColorDefinitionImpl.WHITE( ) );
Plot p = cwaLine.getPlot( );
p.getClientArea( ).setBackground( ColorDefinitionImpl.create( 255,
255,
225 ) );


// Legend
cwaLine.getLegend( ).setVisible( true );

// X-Axis
Axis xAxisPrimary = cwaLine.getPrimaryBaseAxes( )[0];
xAxisPrimary.setType( AxisType.LINEAR_LITERAL );
DataElement max = NumberDataElementImpl.create(100);
DataElement min = NumberDataElementImpl.create(0);
xAxisPrimary.getScale().setMax(max);
xAxisPrimary.getScale().setMin(min);
xAxisPrimary.getScale().setStep(10);


// Y-Axis
Axis yAxisPrimary = cwaLine.getPrimaryOrthogonalAxis( xAxisPrimary );
//yAxisPrimary.setLabelSpan(100);
// Data Set
NumberDataSet categoryValues = NumberDataSetImpl.create( new double[]{
10, 25, 85} );//$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
NumberDataSet orthoValues1 = NumberDataSetImpl.create( new double[]{
25, 35, 15
} );
NumberDataSet orthoValues2 = NumberDataSetImpl.create( new double[]{
10, 10, 25
} );


// X-Series
Series seCategory = SeriesImpl.create( );
seCategory.setDataSet( categoryValues );
SeriesDefinition sdX = SeriesDefinitionImpl.create( );

xAxisPrimary.getSeriesDefinitions( ).add( sdX );
sdX.getSeries( ).add( seCategory );

// Y-Sereis
LineSeries ls1 = (LineSeries) LineSeriesImpl.create( );
ls1.setDataSet( orthoValues1 );
ls1.getLineAttributes( ).setColor( ColorDefinitionImpl.BLUE( ) );

ls1.getLabel( ).setVisible( true );
Trigger tr1 = TriggerImpl.create(TriggerCondition.ONMOUSEOVER_LITERAL, ActionImpl.create(ActionType.SHOW_TOOLTIP_LITERAL, TooltipValueImpl.create(200, null)));
ls1.getTriggers().add(tr1);

SeriesDefinition sdY = SeriesDefinitionImpl.create( );
sdY.getSeriesPalette( ).update( ColorDefinitionImpl.BLUE( ) );
//sdY.getSeriesPalette( ).shift( -2 );
yAxisPrimary.getSeriesDefinitions( ).add( sdY );
sdY.getSeries( ).add( ls1 );


return cwaLine;
}


Jason