Mathematical reciprocal Axis

[yangkuiking]

Feature description

the LogarithmicAxis is very usefull. but i also want use Mathematical reciprocal (example 1/X )，i search all internet no one todo this . it is necessary for me.

[VisualMelon]

See #1278

I vaguely recall looking into this and having difficulty with something... but that would have been years ago and I have no recollection as to what the problem was, so it may be something I'll look into again.

[yangkuiking]

ok. waiting for good news

[yangkuiking]

I did a "quick and dirty" implementation for my purposes,

public class ReciprocalAxis : Axis
 {
     public ReciprocalAxis()
     {

     }

     public override bool IsXyAxis()
     {
         return true;
     }

     public override double Transform(double x)
     {
          return (ActualMinimum * ActualMaximum / x - this.Offset) * this.Scale;
     }

     public override void GetTickValues(out IList<double> majorLabelValues, out IList<double> majorTickValues, out IList<double> minorTickValues)
     {
         var dBandwidth = Math.Abs(this.ActualMaximum - this.ActualMinimum);
         var axisBandwidth = Math.Abs(this.IsVertical() ? this.ScreenMax.Y - this.ScreenMin.Y : this.ScreenMax.X - this.ScreenMin.X);

         var desiredNumberOfTicks = axisBandwidth / this.IntervalLength;
         var ticksPerDecade = desiredNumberOfTicks / dBandwidth;
         

         if (ticksPerDecade < 0.5)
         {
             minorTickValues = this.CreateTickValues(this.ActualMinimum, this.ActualMaximum, 1);
             majorTickValues = this.CreateTickValues(this.ActualMinimum, this.ActualMaximum,5);
             majorLabelValues = majorTickValues;
         }
         else if (ticksPerDecade < 1)
         {
             minorTickValues = this.CreateTickValues(this.ActualMinimum, this.ActualMaximum, 2);
             majorTickValues = this.CreateTickValues(this.ActualMinimum, this.ActualMaximum, 5);
             majorLabelValues = majorTickValues;
         }
         else
         {
             base.GetTickValues(out majorLabelValues, out majorTickValues, out minorTickValues);
         }

     }
 }

and how to use

      var xAxis = new ReciprocalAxis
      {
          Position = AxisPosition.Bottom,
          Title = tagCurveInfo.tagModelInfo.strXTitle,
          MajorGridlineStyle = LineStyle.Solid,
          MinorGridlineStyle = LineStyle.Dot,
          IsZoomEnabled = false,
          IsPanEnabled = false,
      };
     
      TmpModel.Axes.Add(xAxis);

it's really solve my problem

[VisualMelon]

Thanks for sharing this