B4J Question [ABMaterial] Need to put some text on ABMGoogleMap Markers

[vfafou]

Hello!

I've just started to develop my first ABMaterial web app.
I'm using ABMGoogleMap to show some markers on it.
The marker images are customised PNGs.
Before showing these markers, I need to draw some dynamic text on them, like canvas.Drawtext in B4A.

Is there any way to do that with ABMaterial?

Thank you in advance!

 

[vfafou]

It seems that may it's difficult, because I have to provide a URL for the PNGs, so it isn't possible to draw a dynamic pin on the map!

 

[alwaysbusy]

have you tried creating the image at run time and saving it in the www images folder and then using the url to that file? (best give it a name with a random number so the cache doesn't take over)

 

[vfafou]

Hi Alain!
Thank you for your response!
I thought that it's may the only way to do that, but I can't figure out how could I draw text on a given image!

 

[alwaysbusy]

Your own question and answer: https://www.b4x.com/android/forum/threads/draw-text-to-png-image.85807/

 

[vfafou]

Trying to save the PNG to output stream, I take the following error:

java.lang.IllegalStateException: Not on FX application thread; currentThread = main
    at javafx.graphics/com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:291)
    at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:423)
    at javafx.graphics/javafx.scene.Node.snapshot(Node.java:2191)
    at anywheresoftware.b4j.objects.NodeWrapper.Snapshot2(NodeWrapper.java:353)
    at anywheresoftware.b4j.objects.B4XCanvas.CreateBitmap(B4XCanvas.java:86)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:625)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:234)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at jdk.internal.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.debug.Debug.delegate(Debug.java:61)
    at com.vf.rmweb.rmgooglemap._makefleetpos(rmgooglemap.java:708)
    at com.vf.rmweb.rmgooglemap._fptimer_tick(rmgooglemap.java:699)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:625)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:237)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at jdk.internal.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.objects.Timer$TickTack$1.run(Timer.java:118)
    at anywheresoftware.b4a.keywords.SimpleMessageLoop.runMessageLoop(SimpleMessageLoop.java:30)
    at anywheresoftware.b4a.StandardBA.startMessageLoop(StandardBA.java:26)
    at anywheresoftware.b4a.ShellBA.startMessageLoop(ShellBA.java:115)
    at anywheresoftware.b4a.keywords.Common.StartMessageLoop(Common.java:153)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:308)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
    at anywheresoftware.b4j.object.JServlet.createInstance(JServlet.java:65)
    at anywheresoftware.b4j.object.BackgroundWorkersManager$1.run(BackgroundWorkersManager.java:21)
    at anywheresoftware.b4a.keywords.SimpleMessageLoop.runMessageLoop(SimpleMessageLoop.java:30)
    at anywheresoftware.b4a.StandardBA.startMessageLoop(StandardBA.java:26)
    at anywheresoftware.b4a.ShellBA.startMessageLoop(ShellBA.java:115)
    at anywheresoftware.b4a.keywords.Common.StartMessageLoop(Common.java:153)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:308)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:168)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:90)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:94)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:77)
    at com.vf.rmweb.main.main(main.java:29)

The code used is:

Sub CreateBitmapWithText (text As String,bcol As Int,ubmp As String)
    Dim img As B4XBitmap = xui.LoadBitmap(File.DirApp & "\images", ubmp)
    Dim cvs As B4XCanvas = CreateCanvas(img.Width, img.Height)
    cvs.DrawBitmap(img, cvs.TargetRect)
    Dim offset As Int = 10
    cvs.DrawText(text, 0, cvs.TargetRect.Height / 2 + offset, xui.CreateDefaultBoldFont(40 / scale), bcol, "CENTER")
    cvs.Invalidate
    Dim out As OutputStream = File.OpenOutput(File.DirApp & "\images", "fff1.png", False)
    cvs.CreateBitmap.WriteToStream(out,100,"PNG")
    out.Close
  
    cvs.Release
End Sub


Private Sub CreateCanvas(width As Int, height As Int) As B4XCanvas
    Dim p As B4XView = xui.CreatePanel("")
    p.SetLayoutAnimated(0, 0, 0, width, height)
    Dim cvs As B4XCanvas
    cvs.Initialize(p)
    Return cvs
End Sub

What is wrong?

 

[alwaysbusy]

Ah, that's right! B4J non-ui apps cannot manipulate bitmaps

 

[vfafou]

So, is it impossible???

 

[alwaysbusy]

So, is it impossible???

Unfortunately, I think so. But you better ask this in the forum as a non-ABM question as the question should be 'How do I draw on a bitmap in a non-ui B4J application?'

 

[vfafou]

OK, Alain!
Thank you very much!
Have a nice day!