Bug 180190 Some unnecessary error log is shown in charting
When a chart in a report has no data, or there is no SWT interactivity notifier hooked to the engine, an warning or error are logged. Those are normal conditions of execution and should only log with a INFO level.
chart/org.eclipse.birt.chart.device.swt/src/org/eclipse/birt/chart/device/swt/SwtRendererImpl.java
iRoundingStyle,
				dTranslateX,
				dTranslateY,
				dScale ) );
	}
	
	/**
	 * Converts an array of high-res co-ordinates into a single dimensional
	 * double array that represents consecutive X/Y co-ordinates associated
	 * with a polygon's vertices as required in SWT.
	 * 
	 * @param la
	 * @return double array
	 */
	static final double[] getDoubleCoordinatesAsInts( Location[] la,
			int iRoundingStyle, double dTranslateX, double dTranslateY,
			double dScale )
	{
		final int n = la.length * 2;
		final double[] iaXY = new double[n];
		if ( iRoundingStyle == CEIL )
		{
			for ( int i = 0; i < n / 2; i++ )
			{
				iaXY[2 * i] = Math.ceil( ( la[i].getX( ) + dTranslateX )
						* dScale );
				iaXY[2 * i + 1] = Math.ceil( ( la[i].getY( ) + dTranslateY )
						* dScale );
			}
		}