Visio has an annoying feature where the text size is always fixed, regardless of resizing.
Most other tools will resize the text if you have the object as a group (e.g. Inkscape).
To convert all text to resize, here's a macro from https://visguy.com/vgforum/index.php?topic=1797.30
I've modified this macro to always use an integer size for the font, and added another macro to convert this back into a fixed size.
The macros are:
ChangeAllTextToAutoresize: Changes all the shapes in the drawing to automatically resize the text when the object is resized.
ChangeAllTextToFixed: Reverts the formula back to a fixed text size so that the objects can be resized without affecting the font size.
To run this macro, press ALT-F11 > Insert > Module > paste in the code > click on "ChangeAllTextToAutoresize" or "ChangeAllTextToFixed" > F5.
TODO:
Only modify the selected object, and not everything on the page.
Sub ChangeAllTextToAutoresize()
'As the name suggests, this Makro has to be started
Dim shp As Visio.Shape
Dim pg As Visio.Page
For Each pg In Application.ActiveDocument.Pages
For Each shp In pg.Shapes
Change_Formula shp
Next
Next
End Sub
Sub Change_Formula(ByVal shp As Visio.Shape)
Dim douHeight As Double
Dim douCharSize As Double
Dim strFormula As String
Dim SubShape As Visio.Shape
Dim i As Integer
'Change the selected shape
douHeight = shp.Cells("Height").Result("MM")
For i = 0 To shp.Section(3).Count - 1
douCharSize = shp.Section(3).Row(i).Cell(7).Result("pt.")
strFormula = "int(Height/" & douHeight & " mm *" & douCharSize & " pt.)"
shp.Section(3).Row(i).Cell(7).Formula = strFormula
Next i
'Change Sub Shapes by calling this function again
For Each SubShape In shp.Shapes
Change_Formula SubShape
Next
End Sub
Sub ChangeAllTextToFixed()
'As the name suggests, this Makro has to be started
Dim shp As Visio.Shape
Dim pg As Visio.Page
For Each pg In Application.ActiveDocument.Pages
For Each shp In pg.Shapes
Fix_Formula shp
Next
Next
End Sub
Sub Fix_Formula(ByVal shp As Visio.Shape)
' Changes the text formula to just a static number
Dim douHeight As Double
Dim douCharSize As Double
Dim strFormula As String
Dim SubShape As Visio.Shape
Dim i As Integer
'Change the selected shape
douHeight = shp.Cells("Height").Result("MM")
For i = 0 To shp.Section(3).Count - 1
douCharSize = shp.Section(3).Row(i).Cell(7).Result("pt.")
strFormula = douCharSize
shp.Section(3).Row(i).Cell(7).Formula = strFormula & "pt."
Next i
'Change Sub Shapes by calling this function again
For Each SubShape In shp.Shapes
Change_Formula SubShape
Next
End Sub