Bug 212291 SWT Chart render engine always uses 96 DPI(Display) resolution
chart/org.eclipse.birt.chart.device.swt/src/org/eclipse/birt/chart/device/swt/SwtRendererImpl.java
double dAngleInDegrees = g.getDirection( );
		if ( dAngleInDegrees < -90 || dAngleInDegrees > 90 )
		{
			throw new ChartException( ChartDeviceSwtActivator.ID,
					ChartException.RENDERING,
					"SwtRendererImpl.exception.gradient.angle", 
					new Object[]{
						new Double( dAngleInDegrees )
					},
					Messages.getResourceBundle( getULocale( ) ) );
		}
		final Color cPreviousFG = _gc.getForeground( );
		final Color cPreviousBG = _gc.getBackground( );
		Color cFG = (Color) _ids.getColor( cdStart );
		Color cBG = (Color) _ids.getColor( cdEnd );
		
		float x1, y1, x2, y2;
		if ( dAngleInDegrees == 0 )
		{
			x1 = r.x;
			x2 = r.x + r.width;
			y1 = y2 = r.y;
		}
		else if ( dAngleInDegrees == 90 )
		{
			x1 = x2 = r.x;
			y1 = r.y + r.height;
			y2 = r.y;
		}
		else if ( dAngleInDegrees == -90 )