Create Excel graph from updated data on changing input value - excel

Question

This is the thing: I do have an energy model. The outcome is data (Watt) of the losses of energy by wall, floor, windows, ventilation, roof. The changing part in my model is the outside temperature. I did write a macro which changes this temperature from -10 to 10 Celcius. In a normal pie-chart this works nicely. So the temperature field changes and the values for wall, floor etc are updated in their respective fields.
But this is what I need: I want a graph (line or scatter) that will display: temperature (x-axis) and power (Watt, y-axis) for all 5 (wall, floor, etc) places where I lose energy.
How to do this? Can i (do i have to) collect the data and then at the end present it in a graph? Or can i tell excel to extend the graph with each new values when temperature is changed? At this point i can only display the actual data in the fields more or less.
I hope you understand my question and that someone can point me in the right direction.
This is the code I came up with so far:
Sub BtnBuitenTemp()
Dim PauseTime, Start
Dim ws1 As Worksheet
Set ws1 = Sheets(1)
Dim ws2 As Worksheet
Set ws2 = Sheets(2)
Dim cell As Range
' loop through temperature values given on Sheet(2)
' for now these range from -10 to 10
For Each cell In ws2.Range("A20:A40")
' update values in temperature cell
ws1.Cells.Range("D10").Value = cell.Value
' add some pause
PauseTime = 1
Start = Timer
Do While Timer < Start + PauseTime
DoEvents
Loop
Next
End Sub
And a screenshot:
The orange part in "Temperaturen" is changed by the macro. Thereby all other data will be updated and displayed in the chart. The chart will only update the y-axis values at this point. I would like to loop the temperature range (and display this as well on the x-axis) and keep the former values in the chart at their respective temperatures. (I also am not able to display the x-axis range.)
(update)
Ok, I do have a XY (scatter) graph now and I can set the x axis. This is what I do have so far:
Sub BtnBuitenTemp()
Dim PauseTime, Start
Dim tbu_min As Integer
Dim tbu_max As Integer
Dim ws1 As Worksheet
Set ws1 = Sheets(1)
' get user values for min and max temp
tbu_min = ws1.Range("TempBuitenMin").Value
tbu_max = ws1.Range("TempBuitenMax").Value
' set chart x axis values to user input
With ws1.ChartObjects("Chart 7").Chart
With .Axes(xlCategory)
.MinimumScale = tbu_min
.MaximumScale = tbu_max
End With
End With
For temp = tbu_min To tbu_max
' update values in temperature cell
ws1.Cells.Range("D10").Value = temp
' add some pause
PauseTime = 0.5
Start = Timer
Do While Timer < Start + PauseTime
DoEvents
Loop
Next temp
End Sub
And that looks like:
Now I only need to update the data on the right temperature...
update 2 -
I updated my data for the xy scatter graph. I forgot to insert the "Series X Values". Now the right is displayed at the right temperature. I now only need to keep the output in view; at this moment it does refresh the graph each time.

Answer 1

Well, I did solve my problem. Not the way I wanted it, but I do not have time left to find another way. I now just collect all the data and draw a chart from within my macro. This is a prototype that does the trick.
Sub BtnBuitenTemp()
Dim PauseTime, Start
Dim tbu_min As Integer
Dim tbu_max As Integer
Dim ws1 As Worksheet
Set ws1 = Sheets(1)
Dim dataSize As Integer
Dim dataCounter As Integer
Dim myChartObject As ChartObject
Dim addTotal As Boolean
' get user values for min and max temp
tbu_min = ws1.Range("TempBuitenMin").Value
tbu_max = ws1.Range("TempBuitenMax").Value
' how many datapoints are there
Dim xPoints() As Integer
' add surfaces
Dim muur() As Integer
Dim vloer() As Integer
Dim ramen() As Integer
Dim dak() As Integer
Dim ventilatie() As Integer
Dim totaal() As Integer
dataSize = Abs(tbu_max - tbu_min)
ReDim xPoints(dataSize)
ReDim muur(dataSize)
ReDim vloer(dataSize)
ReDim ramen(dataSize)
ReDim dak(dataSize)
ReDim ventilatie(dataSize)
ReDim totaal(dataSize)
' collect data
dataCounter = 0
For temp = tbu_min To tbu_max
' update values in temperature cell
ws1.Cells.Range("D10").Value = temp
' add x for series
xPoints(dataCounter) = temp
' add data for y series
muur(dataCounter) = ws1.Cells.Range("O24").Value
vloer(dataCounter) = ws1.Cells.Range("O47").Value
ramen(dataCounter) = ws1.Cells.Range("O61").Value
dak(dataCounter) = ws1.Cells.Range("O35").Value
ventilatie(dataCounter) = ws1.Cells.Range("O68").Value
totaal(dataCounter) = ws1.Cells.Range("O74").Value
' next
dataCounter = dataCounter + 1
Next temp
' ask to add total
If MsgBox("Wil je ook het totaal tonen in de grafiek?", vbQuestion + vbYesNo) = vbYes Then
addTotal = True
Else
addTotal = False
End If
If Not ChartExists(ws1, "buitentemperatuur") Then
' Chart does not exist, create chart
With ws1.ChartObjects.Add(Left:=200, Width:=600, Top:=200, Height:=400)
With .chart
.Parent.Name = "buitentemperatuur"
.ChartType = xlXYScatterSmooth
.Axes(xlValue).HasMajorGridlines = False
.Axes(xlCategory).Crosses = xlMinimum
.Axes(xlValue).MinimumScale = 0
.HasLegend = True
.HasTitle = True
.ChartTitle.Text = "Invloed van de buitentemperatuur"
End With
End With
End If
' Chart does exist, remove old series and update chart
ws1.ChartObjects("buitentemperatuur").Activate
For Each s In ActiveChart.SeriesCollection
s.Delete
Next s
With ws1.ChartObjects("buitentemperatuur")
With .chart
.Axes(xlValue).MaximumScaleIsAuto = True
With .SeriesCollection.NewSeries
.Name = "muur"
.XValues = xPoints
.Values = muur
End With
With .SeriesCollection.NewSeries
.Name = "vloer"
.XValues = xPoints
.Values = vloer
End With
With .SeriesCollection.NewSeries
.Name = "ramen"
.XValues = xPoints
.Values = ramen
End With
With .SeriesCollection.NewSeries
.Name = "dak"
.XValues = xPoints
.Values = dak
End With
With .SeriesCollection.NewSeries
.Name = "ventilatie"
.XValues = xPoints
.Values = ventilatie
End With
If addTotal Then
With .SeriesCollection.NewSeries
.Name = "totaal"
.XValues = xPoints
.Values = totaal
End With
End If
End With
End With
End Sub
Function ChartExists(wsTest As Worksheet, strChartName As String) As Boolean
Dim chTest As ChartObject
On Error Resume Next
Set chTest = wsTest.ChartObjects(strChartName)
On Error GoTo 0
If chTest Is Nothing Then
ChartExists = False
Else
ChartExists = True
End If
End Function