How to change the legend order

newcomer1

Hi, my Eclipse BIRT Designer version is 4.9.0 and I have a problem with the legend order in the bar chart. The legend order looks good to me for my series A, B, and C. However, when I stack the bars(check the option"Stacked" in "Series" in the "Format Chart" wizard), the legend order is reversed. Is there a way to reverse the order back to before or control it? Thanks a lot for any help.

newcomer1

I found this code and it looks good to me.

/**

 * Called befoer the chart is rendered.

 * 

 * @param gcs

 *      GeneratedChartState

 * @param icsc

 *      IChartScriptContext

 */

function beforeRendering( gcs, icsc )

{

//Script reverses chart legend order

importPackage(Packages.org.eclipse.birt.chart.computation);

importPackage(Packages.java.util);

importPackage(Packages.java.lang);

var llh = gcs.getRunTimeContext().getLegendLayoutHints();

//current legend

var liha = llh.getLegendItemHints( );

//new legend construct

var nliha = java.lang.reflect.Array.newInstance(LegendItemHints, (liha.length));

if ( liha.length > 1 ){

for( idx=0; idx < liha.length; idx++ ){

var tli = liha[idx];

var oldpos = tli.getIndex();

var newpos = (liha.length-1)-idx;

var ntli = liha[newpos];

//valid legend entry

if( tli.getType() == LegendItemHints.Type.LG_ENTRY){

//create a new legend item using the the new items values

var lih = LegendItemHints.newEntry( ntli.getItemText(), ntli.getValueText(), ntli.getSeriesDefinition(), ntli.getSeries(), ntli.getIndex() );

lih.top(tli.getTop());

lih.left(tli.getLeft());

lih.itemHeight(tli.getItemHeight());

nliha[idx]=lih;

}else{

//separator

nliha[idx]=liha[idx];

}

}

}

//Create a new copy of the legend layout hints

var nllh = new LegendLayoutHints( llh.getLegendSize(),llh.getTitleSize(),null, llh.isMinSliceApplied(),llh.getMinSliceText(),

nliha );

//Update before rendering

gcs.getRunTimeContext().setLegendLayoutHints(nllh);

}

newcomer1

I simplify the code. By swapping the left and right item locations, the order will be reversed. It works fine for me.

function beforeRendering( gcs, icsc )

{

var legendItems = gcs.getRunTimeContext().getLegendLayoutHints().getLegendItemHints( );

for( i=0; i < legendItems.length / 2; i++ ){

// left item and right item

var leftItem = legendItems[i];

var rightItem = legendItems[legendItems.length-1-i];

//swap their location(top, left)

top = leftItem.getTop();

left = leftItem.getLeft();

leftItem.top(rightItem.getTop());

leftItem.left(rightItem.getLeft());

rightItem.top(top);

rightItem.left(left);

}

}