iOS Question Drawing to a view

[MitchBu]

Hi, me again...

I try to draw a bitmap to a TextField with the code below, but it does nothing

What am I doing wrong ?

                Dim cvs As Canvas
                cvs.Initialize(EtSignature)
                Dim right, bottom As Int
                Dim right As Int = EtSignature.Left + EtSignature.Width
                Dim bottom As Int = EtSignature.Top + EtSignature.height
                Dim DestRect As Rect
                DestRect.Initialize(EtSignature.Left, EtSignature.Top, right, bottom)
                cvs.DrawBitmap(Image, DestRect) 'draws the bitmap to the destination rectangle.

Image is a valid bitmap that displays just fine in an imageview.

 

[sorex]

are you sure you aren't drawing outside the visible area?

left/down should be 0 I guess unless you over/underlay it instead of attaching it to the textfield.

and

right=EtSignature.Width
bottom=EtSignature.height

 

[Erel]

1. Better to use B4XCanvas.
2. Don't forget to call B4XCanvas.Invalidate.

Tip: reuse the canvas when possible.

 

[MitchBu]

1. Better to use B4XCanvas.
2. Don't forget to call B4XCanvas.Invalidate.

Tip: reuse the canvas when possible.

Which library is B4XCanvas in ?

Thank you.

 

[LucaMs]

Which library is B4XCanvas in ?

https://www.b4x.com/android/forum/pages/results/?query=B4XCanvas

 

[Erel]

XUI

 

[MitchBu]

XUI

Thank you Erel

 

[MitchBu]

OK. I tried B4XCanvas, but no joy. I see nothing

Here is the code (project attached):

    Canvas1.Initialize(Panel1)
    Dim Rect1 As B4XRect
    Rect1.Initialize(100dip, 100dip, 200dip, 150dip)
    Canvas1.DrawRect(Rect1, Colors.Black, True, 5dip)
    
    Canvas1.DrawText("Testing", 100dip, 100dip, Font.DEFAULT, Colors.Red,"LEFT")

What am I doing wrong ?

I will appreciate any pointers.

TIA

 

[MitchBu]

I forgot to call invalidate!

I should have re read Erel's post.

Thank you

 

[TILogistic]

see use B4XCanvas in B4X:

SuperToolTips

Hello, Could you tell me which way to use that kind of toolTips : seen on: https://stackoverflow.com/questions/21031488/android-popupwindow-with-tooltip-arrow Regards Michel

www.b4x.com

 

[TILogistic]

demo B4J:
also works on b4a and b4i to see what to do with B4Xcanvas.

 

[MitchBu]

demo B4J:
also works on b4a and b4i to see what to do with B4Xcanvas.

Superb.

Thank you oparra