Line-To-Top waveform graph

[UmmGooD]

I have a waveform plot that has a Y-Axis range from 0 to 127.  It is important that the plot goes from 0 to 127.  The problem is normally the device I am measuring returns 127 for most conditions.  I am currently using a Line-To-Base style plot but would like the lines to go from the top of the chart down.  Unfortunately there is no apparent way to get a Line-To-Top style.

I attached my plot.  As you can see I would like the lines to go from the top down.

Here is my code for setting up the style of the waveformPlot (linemode is true):

                waveformPlot4.FillBase = XYPlotFillBase.YValue;
                waveformPlot4.ToolTipsEnabled = true;
                waveformPlot4.DefaultStart = lowerLimit;
                waveformPlot4.DefaultIncrement = spacing;
                waveformPlot4.YAxis = axis3;

                waveformPlot4.PointStyle = PointStyle.Cross;
                waveformPlot4.PointColor = Color.Yellow;

                if (!lineMode)
                {
                    waveformPlot4.FillMode = PlotFillMode.None;
                    waveformPlot4.LineColor = Color.Yellow;
                }
                else
                {
                    waveformPlot4.FillMode = PlotFillMode.Lines;
                    waveformPlot4.LineColor = Color.Empty;
                    waveformPlot4.LineToBaseWidth = 1;
                    waveformPlot4.LineToBaseColor = Color.Yellow;
                }

[nickb · Accepted solution]

Hello - 

You're almost there - just missing one line.  This should do it for you:

waveformPlot4.BaseYValue = 127;

NickB

National Instruments  

[UmmGooD]

Thanks that worked great!  I can't believe I missed that.  I was assuming I would have to do some AfterDrawPlot painting or something that would be a pain.