Improve text rotation

[jzy3d]

Text is always rotated from center, whatever its layout. LEFT/RIGHT aligned text should rather have their rotation point on the anchor.

This would ease positioning Y axis label in the 2D case as the default layout is

but which is fixed with a undesirable fix in AxisLabelProcessor.axisLabelPosition_2D with the below code

if(!LabelOrientation.HORIZONTAL.equals(axisLayout.getYAxisLabelOrientation())) {
      
      // consider the rotation & offset due to vertical text 
      int textLength = view.getPainter().getTextLengthInPixels(axisLayout.getFont(), axisLayout.getYAxisLabel());
      
      // hack the emulgl vertical Y axis case by ignoring pixel scale for text
      if(!view.getCanvas().isNative())
        textLength /= pixelScale.y;
      
      xShiftPx -= textLength/2;
      
      int textHeight = axisLayout.getFont().getHeight();
      
      // hack the emulgl vertical Y axis case by ignoring pixel scale for text
      if(!view.getCanvas().isNative())
        textHeight /= pixelScale.x;

      xShiftPx += textHeight/2;
    }