B4J Question jSD_OpenMaps - EditingPolygon/EditingPolyline

D

Davisbc

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Licensed User
Has anyone been able to get these 2 methods to work? I went back a loaded the demo and neither method seem to work. They return true when called but do not respond to any actions on the selected object. The object on the map does set itself to edit mode. Maybe i am missing a routine to handle the edits.

The following code is how i call the method. Its direct from the demo.

OpenMaps EditingPolygon code: 
        Case "Polygon"
            Dim Success As Boolean =gmap.EditingPolygon(ObjSelected,Checked)
            logMessage ("EditPolygon status is " & Success)
            If Checked  Then
                LabelObj.Text="" ' reset add obj
                gmap.PanelOn
                gmap.MessageToPanel("Click the RIGHT mouse button to finish")
            Else
                gmap.PanelOff
            End If
            
        Case "Polyline"
            Dim Success As Boolean = gmap.EditingPolyline(ObjSelected,Checked)
            logMessage ("EditPolyline status is " & Success)
            If Checked  Then
                LabelObj.Text="" ' reset add obj
                gmap.PanelOn
                gmap.MessageToPanel("Click the RIGHT mouse button to finish")
            Else
                gmap.PanelOff
            End If

Thanks in advance,
barry
 
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Star-Dust

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Are you sure you selected the polygon (or polyline) before selecting edit?
 
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D

Davisbc

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OK, i reloaded the demo source from https://www.b4x.com/android/forum/attachments/openmapsdemo-zip.163103/

I had to comment out the compiler path line in main. It is redundant to the "config Path" value

B4X: 
#Region Project Attributes
    #MainFormWidth: 1000
    #MainFormHeight: 650
#End Region

'#JavaCompilerPath: 19, C:\Program Files\Java\jdk-19.0.2\bin\javac.exe
#PackagerProperty: IncludedModules = javafx.web

Sub Process_Globals

I got the same result i described earlier.

Are you using the same demo as the on on the download? I noticed the colors in your example are different than the ones in the demo.

Thanks in advance,
B
 
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Star-Dust

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Obviously it's the same example, but most importantly it's the same library. This seems like a superfluous question to me.
Describe the problem better, do other methods work? Can you add Polygons? After activating the modification, do white points appear in the corners of the polygon?
 
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Davisbc

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Obviously it's the same example, but most importantly it's the same library. This seems like a superfluous question to me.

Describe the problem better, do other methods work?

When you edit the polygon, the white points show up but do not respond to selecting and holding either the red + circle or the white ball at the vertex.

it works the same way for polyline or polygon. Edit works for circle.

POLYline



Polygon
 
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Star-Dust

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If you can't aim for the white dots you simply need to increase the tolerance (standard value is 15). This will increase the diameter of the spot's sensitive field.
Obviously, if there are points that are too close to each other, increasing the tolerance would cause the sensitive area to overlap

B4X: 
OpenaMap.EditConfigure(0,25)
 
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Davisbc

Member
Licensed User
Thanks, I modified the demo code to the following:

B4X: 
Private Sub OMaps_Ready
    LabelZoom.Text=OMaps.Zoom
    OMaps.EditConfigure(0,45)   
    
    Log ("Map Ready")
    wait for (OMapsExt.AddressToLatLon("Torre Eiffel")) COMPLETE (ll As LatLng)
    
    Log ("Map Rady - After Wait")
    OMaps.Zoom=16
    OMaps.MoveCamera2(ll)
    

            
    Dim Cr As MapCircle = OMaps.AddCircle(ll,50,2,fx.Colors.Red,fx.Colors.Yellow,0.5)
    Dim Mk As Marker = OMaps.AddMarker2(ll.Latitude,ll.Longitude,"My Marker","https://cdn-icons-png.flaticon.com/512/684/684908.png")
    Dim Pl As MapPolyline = OMaps.AddPolyline(Array(pt(48.8586973, 2.296136), pt(48.8572973, 2.297036), pt(48.8572973, 2.295236)),4,fx.Colors.Red)
    Dim Pg As MapPolygon = OMaps.AddPolygon(Array(pt(48.8575703, 2.292737), pt(48.8561703, 2.293637), pt(48.8561703, 2.291837)),1,fx.Colors.Red,fx.Colors.Yellow,0.3)
    
    ObjectMap.Put(Cr.ID,Cr)
    ObjectMap.Put(Mk.ID,Mk)
    ObjectMap.Put(Pg.ID,Pg)
    ObjectMap.Put(Pl.ID,Pl)
End Sub

I could not edit the polygon.

I also noticed that the app never responded to the address to LatLon request. The map stays on Italy.

B
 
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Davisbc

Member
Licensed User
i was able to edit polygon in my app, but not in the demo. It looks like the set config was the trick for editing.

Still not able to get a response from OMapsExt.AddressToLatLon request.

Thanks,
 
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Davisbc

Member
Licensed User
After working with the edit function for a while and adjusting the map using editConfig; my problem is that i assumed the white [edit] ball was the place that i should have been using to edit. I can edit the polygon by probing just where the hotspot is to to move the vertex. My guess is that there is a difference between the x,y of the canvas and the lat,long of the map. when you build the polygon, you can see (for a part of a section) that the polygon on the map is different than the on on the canvas.

You can also see whitespace around the map, that i suspect is why there is a difference between x,y and lat,long. EditConfig lets me tune the display, but maybe not the long term answer.

By the way, I really like the you have done on the package. Its VERY cool and i prefer it to google maps.

Thanks,
B
 
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Star-Dust

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In some rare cases, there is no correspondence, but the function that converts the position on the map to coordinates is native and cannot be modified. EditConfing allows you to adjust the coordinates and enlarge the sensitive area.

Sometimes the misalignment is horizontal, so it is a few pixels more to the right or left (never vertical), the offset parameter allows you to adjust this too.
You could add a calibration system like you do for touch, but it's not that simple.
 
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