Hi Experts,

I have a FastPoint Chart with Y axis as a NLogarithmicScaleConfigurator. The plotting of the points is done in Paint2D.
When I use the code with a Linear axis everything is working fine. But when I switch the axis to NLogarithmicScale, the following doesnt work anymore:
      NScale axisScaleY = m_Chart.Axis(m_Series.VerticalAxes[0]).Scale;
      axisScaleY.Ruler.GetScaleAndOffset(out scaleY, out offsetY);

=> the out values scaleY and offsetY are always 0. 

So what must be changed in the following code that it also is working for logarithmic axis ?

Thanks for your help,
Best regards,
Joern

 Code which is working for Linear axis::

  public void Paint2D(NChartRenderingContext2D context, NGraphics graphics)
   {
    unsafe {
      if (graphics == null || graphics.DeviceGraphics == null) return;

      if (m_XValues.Length < 1 || m_YValues.Length < 1) return;

      NScale axisScaleX = m_Chart.Axis(m_Series.HorizontalAxes[0]).Scale;
      NScale axisScaleY = m_Chart.Axis(m_Series.VerticalAxes[0]).Scale;
      NScaleRuler rulerX = axisScaleX.Ruler;
      NScaleRuler rulerY = axisScaleY.Ruler;
     // cache values need to be transformed from logical to scale
      double[] xValues = m_XValues;
      double[] yValues = m_YValues;

      int count = xValues.Length;
      float modelScaleX = (float)1.0;  
      float modelScaleY = (float)1.0;  

      GraphicsState state = graphics.DeviceGraphics.Save();

      context.ActivateCamera(m_Chart);

      double scaleX = 0.0;
      double offsetX = 0.0;

      rulerX.GetScaleAndOffset(out scaleX, out offsetX);
      scaleX *= modelScaleX;
      offsetX *= modelScaleX;

      double scaleY = 0.0;
      double offsetY = 0.0;

      try {
       rulerY.GetScaleAndOffset(out scaleY, out offsetY);
      }
      catch (Exception) {
       //throw;
      }

      scaleY *= modelScaleY;
      offsetY *= modelScaleY;


      NRange1DD viewXRange = axisScaleX.RulerRange;
      NRange1DD viewYRange = axisScaleY.RulerRange;


      double viewX1 = viewXRange.GetValueInRange(m_XRange.Begin);
      double viewX2 = viewXRange.GetValueInRange(m_XRange.End);
      double viewY1 = viewYRange.GetValueInRange(m_YRange.Begin);
      double viewY2 = viewYRange.GetValueInRange(m_YRange.End);

      if (double.IsNaN(viewX1) || double.IsInfinity(viewX1)) return;
      if (double.IsNaN(viewX2) || double.IsInfinity(viewX2)) return;
      if (double.IsNaN(viewY1) || double.IsInfinity(viewY1)) return;
      if (double.IsNaN(viewY2) || double.IsInfinity(viewY2)) return;

      int pointSize = (int)context.Device.LengthConverter.ConvertNLengthToLength(new NLength(m_PointSize, NGraphicsUnit.Point));
      int pointSizeDiv2 = pointSize / 2;

      int pointOffsetX = pointSize;
      int pointOffsetY = pointSize;

      float x1 = (float)(viewX1 * scaleX + offsetX);
      float y1 = (float)(viewY1 * scaleY + offsetY);

....

      graphics.DeviceGraphics.DrawImage(drawBitmap
                  , new Rectangle((int)x1
                  , (int)y2
                  , drawBitmap.Width
                  , drawBitmap.Height)
                  , new Rectangle(0, 0, drawBitmap.Width, drawBitmap.Height)
                  , GraphicsUnit.Pixel);
       Point[] points = new Point[] { new Point((int)x1, (int)y2) };

       graphics.DeviceGraphics.Transform.TransformPoints(points);
       m_SelectionOrigin = points[0];

... I just have prepaired a little example - but since this example contains also some code which should not be disclosed: Can I send you this code so that it is not available for the public ?

Thanks again,
Best regards,
Joern

Hi Joern,
Sure - please mail it to support@nevron.com it will be treated as confidential.

Best Regards,
Nevron Support Team