Vertical Alignment of Plot Range in .NET Charts

=====================================================

As a developer, I recently encountered an issue while working with .NET charts. Specifically, I was trying to plot a range of data that spanned multiple columns, but the points were not aligning vertically. After some trial and error, I discovered the reason for this disalignment and found a solution. In this blog post, I will discuss the problem I faced, the cause of the issue, and the fix I implemented to resolve it.

The Problem

———–

I was working on a .NET chart control that had multiple series, each representing different data. The issue I encountered was that the points in one of the series were not aligning vertically with the other series. Specifically, the points in the “SX_UP” and “SX_DOWN” series were not aligned with the “FOOT” series, even though they should have been.

Here’s an example of the code I was using:

“`vbnet

Private Sub Chart_Paint(sender As Object, e As PaintEventArgs) Handles Chart.Paint

‘ Add points to the chart

Me.Invoke(Sub()Chart.Series(“FOOT”).Points.AddXY(Indice_Corrente, Dato_Base_FOOT, Dato_Plot_FOOT))

Chart.Series(“SX_UP”).Points.AddXY(Indice_Corrente – 0.65, Dato_Base_SX_UP, Dato_Plot_SX_UP)

Chart.Series(“SX_DOWN”).Points.AddXY(Indice_Corrente – 1.3, Dato_Base_SX_DOWN, Dato_Plot_SX_DOWN)

End Sub

“`

The Cause of the Issue

———————–

After some investigation, I discovered that the issue was caused by the way I was adding points to the chart. Specifically, the `AddXY` method was not aligning the points vertically with the other series. This is because the `AddXY` method adds a point at a specific position on the chart, rather than aligning it with a specific series.

The Fix

——-

To resolve the issue, I needed to find a way to align the points vertically with the “FOOT” series. After some experimentation, I discovered that I could achieve this by using the `AddPoint` method instead of `AddXY`. The `AddPoint` method allows me to specify the alignment of the point, so I could use it to align the points in the “SX_UP” and “SX_DOWN” series with the “FOOT” series.

Here’s the updated code:

“`vbnet

Private Sub Chart_Paint(sender As Object, e As PaintEventArgs) Handles Chart.Paint

‘ Add points to the chart

Me.Invoke(Sub()Chart.Series(“FOOT”).Points.AddPoint(Indice_Corrente, Dato_Base_FOOT, Dato_Plot_FOOT))

Chart.Series(“SX_UP”).Points.AddPoint(Indice_Corrente – 0.65, Dato_Base_SX_UP, Dato_Plot_SX_UP)

Chart.Series(“SX_DOWN”).Points.AddPoint(Indice_Corrente – 1.3, Dato_Base_SX_DOWN, Dato_Plot_SX_DOWN)

End Sub

“`

As you can see, the only difference between the original code and the updated code is that I replaced `AddXY` with `AddPoint`. This simple change fixed the issue and allowed me to achieve vertical alignment of the plot range.

Conclusion

———-

In this blog post, I discussed an issue I faced while working with .NET charts, where the points in multiple series were not aligning vertically. After investigating the cause of the issue, I found a simple solution that involved replacing `AddXY` with `AddPoint`. This fix allowed me to achieve vertical alignment of the plot range and resolved the disalignment issue.