Android Question Image touch position

eurojam said:

Hi,
if you work with a panel and a canvas, the touch coordinates will always be like absolute image coordinates in pixel - that is what I think....may be I am wrong, but test this code, it will give you absolute image coordinates....you can play with the position and size of the panel...

B4X:

Sub Globals
    'These global variables will be redeclared each time the activity is created.
    'These variables can only be accessed from this module.
    Dim Panel1 As Panel
    Dim Canvas1 As Canvas
    Dim b As Bitmap

End Sub

Sub Activity_Create(FirstTime As Boolean)
    'Do not forget to load the layout file created with the visual designer. For example:
    'Activity.LoadLayout("Layout1")
    Panel1.Initialize("panel1")
    Activity.AddView(Panel1,0, 200dip,400dip,400dip)
  
    Canvas1.Initialize(Panel1)
  
    Dim r1, r2 As Rect
    b.Initialize(File.DirAssets, "test.png")
    r1.Initialize(0,0, b.Width, b.Height)
  
    Canvas1.DrawBitmap(b, Null, r1)  

End Sub

Sub panel1_Touch (Action As Int, X As Float, Y As Float)
    If Action= 1 Then
        If x < b.Width And y < b.height Then
          Log("X " & X)
          Log("Y " & Y)
        End If
    End If
End Sub

Click to expand...