Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/render/AxesRenderer.java
final InteractionEvent iev = (InteractionEvent) ( (EventObjectCache) idr ).getEventObject( StructureSource.createMarkerRange( mr ),
								InteractionEvent.class );
						for ( int t = 0; t < elTriggers.size( ); t++ )
						{
							tg = TriggerImpl.copyInstance( (Trigger) elTriggers.get( t ) );
							processTrigger( tg,
									StructureSource.createMarkerRange( mr ) );
							iev.addTrigger( tg );
						}
						iev.setHotSpot( rre );
						idr.enableInteraction( iev );
					}
				}
				ScriptHandler.callFunction( sh,
						ScriptHandler.AFTER_DRAW_MARKER_RANGE,
						ax,
						mr,
						getRunTimeContext( ).getScriptContext( ) );
				getRunTimeContext( ).notifyStructureChange( IStructureDefinitionListener.AFTER_DRAW_MARKER_RANGE,
						mr );
			}
		}
	}
	/**
	 * Ths background is the first component rendered within the plot block.
	 * This is rendered with Z-order=0
	 */
	protected void renderBackground( IPrimitiveRenderer ipr, Plot p )
			throws ChartException
	{