Excel XY图(散点图)数据标签无重叠 [英] Excel XY Chart (Scatter plot) Data Label No Overlap
问题描述
所以我在过去一周一直在努力。虽然它不能做奇迹,可以说我有一个很好的结果:
我只是想要把这个代码放在那里,像我这样的那些正在寻找某种vba宏的穷人,可以帮助他们避免在分散情况下的标签重叠,因为在进行关于这个问题的研究时,我无法找到任何有用的东西。
So I've been working on this for the past week. Although it can't do miracles, I can say I've got a pretty good result:
I just wanted to put this code out there for all the poor souls like me that are looking for some kind of vba macro that helps them avoid label overlaps in a scatter plot, because while doing my research on the subject, I wasn't able to find anything helpful.
推荐答案
Const PIXEL_TO_POINT_RATIO As Double = 0.72 '1 Pixel = 72/96*1 Point
Const tStep As Double = 0.1
Const rStep As Double = 0.1
Dim pCount As Integer
Sub ExampleMain()
RearrangeScatterLabels Sheet5
RearrangeScatterLabels Sheet25
End Sub
Sub RearrangeScatterLabels(sht As Worksheet)
Dim plot As Chart
Dim sCollection As SeriesCollection
Dim dLabels() As DataLabel
Dim dPoints() As Point
Dim xArr(), yArr(), stDevX, stDevY As Double
Dim x0, x1, y0, y1 As Double
Dim temp() As Double
Dim theta As Double
Dim r As Double
Dim isOverlapped As Boolean
Dim safetyNet, validEntry, currentPoint As Integer
Set plot = sht.ChartObjects(1).Chart 'XY chart (scatter plot)
Set sCollection = plot.SeriesCollection 'All points and labels
safetyNet = 1
pCount = (sCollection.Count - 1)
ReDim dLabels(1 To 1)
ReDim dPoints(1 To 1)
ReDim xArr(1 To 1)
ReDim yArr(1 To 1)
For pt = 1 To sCollection(1).Points.Count
For i = 1 To pCount
If sCollection(i).Points.Count <> 0 Then
'Dynamically expand the arrays
validEntry = validEntry + 1
If validEntry <> 1 Then
ReDim Preserve dLabels(1 To UBound(dLabels) + 1)
ReDim Preserve dPoints(1 To UBound(dPoints) + 1)
ReDim Preserve xArr(1 To UBound(xArr) + 1)
ReDim Preserve yArr(1 To UBound(yArr) + 1)
End If
Set dLabels(i) = sCollection(i).Points(pt).DataLabel 'Store all label objects
Set dPoints(i) = sCollection(i).Points(pt) 'Store all point objects
temp = getElementDimensions(, dPoints(i))
xArr(i) = temp(0) 'Store all points x values
yArr(i) = temp(2) 'Store all points y values
End If
Next
Next
If UBound(dLabels) < 2 Then Exit Sub
pCount = UBound(dLabels)
stDevX = Application.WorksheetFunction.StDev(xArr) 'Get standard deviation for x
stDevY = Application.WorksheetFunction.StDev(yArr) 'Get standard deviation for y
If stDevX = 0 Then stDevX = 1
If stDevY = 0 Then stDevY = 1
r = 0
For currentPoint = 1 To pCount
theta = Rnd * 2 * Application.WorksheetFunction.Pi()
x0 = xArr(currentPoint)
y0 = yArr(currentPoint)
x1 = xArr(currentPoint)
y1 = yArr(currentPoint)
isOverlapped = True
Do Until Not isOverlapped
safetyNet = safetyNet + 1
If safetyNet < 500 Then
If Not checkForOverlap(dLabels(currentPoint), dLabels, dPoints, plot) Then
'No label is within bounds and not overlapping
isOverlapped = False
r = 0
theta = Rnd * 2 * Application.WorksheetFunction.Pi()
safetyNet = 1
Else
'Move label so it does not overlap
theta = theta + tStep
r = r + rStep * tStep / (2 * Application.WorksheetFunction.Pi())
x1 = x0 + stDevX * r * Cos(theta)
y1 = y0 + stDevY * r * Sin(theta)
dLabels(currentPoint).Left = x1
dLabels(currentPoint).Top = y1
End If
Else
safetyNet = 1
Exit Do
End If
Loop
Next
End Sub
Function checkForOverlap(ByRef dLabel As DataLabel, ByRef dLabels() As DataLabel, ByRef dPoints() As Point, ByRef dChart As Chart) As Boolean
checkForOverlap = False 'Return false by default
'Detect label going over chart area
If detectOverlap(dLabel, , , dChart) Then
checkForOverlap = True
Exit Function
End If
'Detect labels overlap
For i = 1 To pCount
If Not dLabel.Left = dLabels(i).Left Then
If detectOverlap(dLabel, dLabels(i)) Then
checkForOverlap = True
Exit Function
End If
End If
Next
'Detect label overlap with point
For i = 1 To pCount
If detectOverlap(dLabel, , dPoints(i)) Then
checkForOverlap = True
Exit Function
End If
Next
End Function
Function getElementDimensions(Optional dLabel As DataLabel, Optional dPoint As Point, Optional dChart As Chart) As Double()
'Get element dimensions and compensate slack
Dim eDimensions(3) As Double
'Working in IV quadrant
If dPoint Is Nothing And dChart Is Nothing Then
'Get label dimensions and compensate padding
eDimensions(0) = dLabel.Left + PIXEL_TO_POINT_RATIO * 3 'Left
eDimensions(1) = dLabel.Left + dLabel.Width - PIXEL_TO_POINT_RATIO * 3 'Right
eDimensions(2) = dLabel.Top + PIXEL_TO_POINT_RATIO * 6 'Top
eDimensions(3) = dLabel.Top + dLabel.Height - PIXEL_TO_POINT_RATIO * 3 'Bottom
End If
If dLabel Is Nothing And dChart Is Nothing Then
'Get point dimensions
eDimensions(0) = dPoint.Left - PIXEL_TO_POINT_RATIO * 5 'Left
eDimensions(1) = dPoint.Left + PIXEL_TO_POINT_RATIO * 5 'Right
eDimensions(2) = dPoint.Top - PIXEL_TO_POINT_RATIO * 5 'Top
eDimensions(3) = dPoint.Top + PIXEL_TO_POINT_RATIO * 5 'Bottom
End If
If dPoint Is Nothing And dLabel Is Nothing Then
'Get chart dimensions
eDimensions(0) = dChart.PlotArea.Left + PIXEL_TO_POINT_RATIO * 22 'Left
eDimensions(1) = dChart.PlotArea.Left + dChart.PlotArea.Width - PIXEL_TO_POINT_RATIO * 22 'Right
eDimensions(2) = dChart.PlotArea.Top - PIXEL_TO_POINT_RATIO * 4 'Top
eDimensions(3) = dChart.PlotArea.Top + dChart.PlotArea.Height - PIXEL_TO_POINT_RATIO * 4 'Bottom
End If
getElementDimensions = eDimensions 'Return dimensions array in Points
End Function
Function detectOverlap(ByVal dLabel1 As DataLabel, Optional ByVal dLabel2 As DataLabel, Optional ByVal dPoint As Point, Optional ByVal dChart As Chart) As Boolean
'Left, Right, Top, Bottom
Dim AxL, AxR, AyT, AyB As Double 'First label coordinates
Dim BxL, BxR, ByT, ByB As Double 'Second label coordinates
Dim eDimensions() As Double 'Element dimensions
eDimensions = getElementDimensions(dLabel1)
AxL = eDimensions(0)
AxR = eDimensions(1)
AyT = eDimensions(2)
AyB = eDimensions(3)
If dPoint Is Nothing And dChart Is Nothing Then
'Compare with another label
eDimensions = getElementDimensions(dLabel2)
End If
If dLabel2 Is Nothing And dChart Is Nothing Then
'Compare with a point
eDimensions = getElementDimensions(, dPoint)
End If
If dPoint Is Nothing And dLabel2 Is Nothing Then
'Compare with chart area
eDimensions = getElementDimensions(, , dChart)
End If
BxL = eDimensions(0)
BxR = eDimensions(1)
ByT = eDimensions(2)
ByB = eDimensions(3)
If dChart Is Nothing Then
detectOverlap = (AxL <= BxR And AxR >= BxL And AyT <= ByB And AyB >= ByT) 'Reverse De Morgan's Law
Else
detectOverlap = Not (AxL >= BxL And AxR <= BxR And AyT >= ByT And AyB <= ByB) 'Is in chart bounds (working in IV quadrant)
End If
End Function
我意识到代码很粗糙,没有优化,但是我不能花更多的时间在这个项目上。我已经留下了不少笔记来帮助阅读,如果有人选择继续这个项目。希望这有帮助。
最好的祝福,Schadenfreude。
I realize the code is kinda rough and not optimized, but I can't spend more time on this project. I've left quite a few notes around to help read it, should anyone choose to continue this project.
Hope this helps.
Best wishes, Schadenfreude.
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