Utilizzare una DrawingArea con gb.map anziché una MapView

Mostreremo di seguito un semplice codice esemplificativo, nel quale si farà uso di una DrawingArea anziché ddell'oggetto MapView.

Bisognerà porre sul Form una DrawingArea, uno Slider ed un ValueBox per lo zoom. Si dovrà, inoltre, attivare il Componenti gb.map e gb.qt5 .

Private hMap As New Map    
Private x As Integer
Private y As Integer
Private mp As MapPoint
Private pt As New Point
Private initium As Boolean
 
 
Public Sub _New()    
 
 With hMap
   .AddTile("GoogleMaps", "https://khms{s}.google.it/kh/v={version}&src=app&x={x}&y={y}&z={z}&s=Galile", ["version": "800"]).SubDomains = ["0", "1", "2"]
   mp = MapPoint(34.976001513175, 13.3154296875)
   .Center = mp
   .Center.Lat = 37
   .Center.Lon = 14 
 End With
 With Me  
   .W = Desktop.W
   .H = Desktop.H  
 End With
 With DrawingArea1  
   .X = Me.W * 0.007
   .Y = Me.H * 0.01
   .W = Me.W * 0.96
   .H = Me.H * 0.95
 End With
 With LCDLabel1
   .X = Me.W * 0.967
   .Y = Me.H * 0.04
   .W = Me.W * 0.02
   .H = Me.H * 0.02
   .Alignment = Align.Right
   .Foreground = Color.Red
   .Font.Size = 18
   .Font.Bold = True
 End With
 
End
 
 
Public Sub Form_Open()
 
 With Slider1
   .X = Me.W * 0.975
   .Y = Me.H * 0.07
   .Value = 6
   .MaxValue = 18
   .MinValue = 6
 End With    
 
 hMap.Zoom = Slider1.Value  
 
 DrawingArea1.Refresh()
  
End
 
 
Public Sub DrawingArea1_Draw()
 
 Dim lat, lon As Float
 
 With hMap
   .Width = Paint.W
   .Height = Paint.H
   .Draw()
 End With
 
 lat = hMap.PixelToMapPointRel(pt).Lat
 lon = hMap.PixelToMapPointRel(pt).Lon

 If initium Then
   With Paint
     .Brush = Paint.Color(Color.Red)
     .Font.Size = 16
     .Ellipse(x - 1, y - 1, 4, 4)
     .Font.Size = 8
     .Text(" " & Geo.DecToSex(lat, 1) & "\n " & Geo.DecToSex(lon, 2), x, y, 120, 20)
     .Fill
     .End
   End With
 Endif
 
 DrawingArea1.Refresh()
 
End
 
 
Public Sub DrawingArea1_MouseMove()  
 
 Dim c As New Single[18]
 Dim mx, my As Short
 
 c = [0, 0, 0, 0, 0, 5, 6.4, 7.6, 8.8, 9.9, 10.9, 11.9, 12.94, 13.96, 14.98, 15.98, 16.99, 17.994]
 
 mx = (x - Mouse.X)
 my = (y - Mouse.Y)
 
 With hMap  
   .Center.Lat -= ((my ^ 0) * my) / ((Slider1.Value * 10) / (Slider1.Value - c[Slider1.Value - 1]))
   .Center.Lon += ((mx ^ 0) * mx) / ((Slider1.Value * 10) / (Slider1.Value - c[Slider1.Value - 1]))
 End With
 
 x = Mouse.X  
 y = Mouse.Y  
 
End
 
 
Public Sub DrawingArea1_MouseDown()  
 
 pt = pt(Mouse.X, Mouse.Y)
 
 x = Mouse.X  
 y = Mouse.Y  
 
 initium = True
  
End
 
Public Sub Slider1_Change()
  
 hMap.Zoom = Slider1.Value
 LCDLabel1.Value = Slider1.Value
 initium = False
 
End  
 
Public Sub DrawingArea1_MouseUp()
 
 pt = pt(Mouse.X, Mouse.Y)
 mp = MapPoint(hMap.PixelToMapPointRel(pt).Lat, hMap.PixelToMapPointRel(pt).Lon)
  
End


Public Sub Form_Close()
 
 Quit
 
End