B4J Question [ BitmapCreator and Canvas ] how can i draw in png image and export ?

TILogistic

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• May 12, 2020

• #2

tips:

Dim b As B4XBitmap = cvs.CreateBitmap

ImageView_Bmp.SetImage(b)

ImageView_Bmp.SetImage(b.Crop(0, 0, cvs.TargetRect.Width, cvs.TargetRect.Height))

but dont show nothing on imageview

Gravity = FILL or CENTER

 

Last edited: May 12, 2020

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Waldemar Lima

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• May 12, 2020

• #3

I need ser imageview gravity - Fill ir center ?

 

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TILogistic

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• May 12, 2020

• #4

you need to export to PNG, JPG or BASE64?

 

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TILogistic

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• May 12, 2020

• #5

See:

 

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Waldemar Lima

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• May 12, 2020

• #6

oparra said:

you need to export to PNG, JPG or BASE64?

Click to expand...

Any image format ( png , bitmap , jpg , othr )

 

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TILogistic

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• May 12, 2020

• #7

see:

cv.DrawCircle(50, 50, 20, fx.Colors.Red, True, 0)
cv.Invalidate

Dim b As B4XBitmap = cv.CreateBitmap

or

Dim b As B4XBitmap = cv.CreateBitmap.Crop(0, 0, cv.TargetRect.Width, cv.TargetRect.Height)

ImageView_Bmp.SetImage(b.Resize(350, 350, True))

 

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Waldemar Lima

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• May 12, 2020

• #8

I Just dont understand how can i show image on imageview

 

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Waldemar Lima

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• May 12, 2020

• #9

I need call " cv.createbitmap " to show ?

 

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TILogistic

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• May 12, 2020

• #10

B4X:

    MainForm = Form1
    MainForm.RootPane.LoadLayout("main") 'Load the layout file.
    MainForm.Show
    
    cv.Initialize("cv")
    
    Dim bc As BitmapCreator
    bc.Initialize(MainForm.WindowWidth, MainForm.WindowHeight)
    Dim bmp As B4XBitmap = xui.LoadBitmapResize(File.DirAssets, "img.jpg", 600, 800, True)
    
    'cv.DrawImage(bc.Bitmap, bc.Bitmap.Width, bc.Bitmap.Width, bc.Bitmap.Width, bc.Bitmap.Height)
        
    cv.DrawCircle(50, 50, 20, fx.Colors.Red, True, 0)

    ImageView_Bmp.SetImage(cv.Snapshot)

Do you need to add a circle to the image?

is what I see ... do you want that?

 

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TILogistic

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• May 12, 2020

• #11

I need call " cv.createbitmap " to show ?
Yes

 

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TILogistic

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• May 12, 2020

• #12

convert camvas to bitmap

 

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TILogistic

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• May 12, 2020

• #13

see: add cv.Invalidate

 

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TILogistic

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• May 12, 2020

• #14

you add:

cv.Invalidate
after creating the canvas

 

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TILogistic

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• May 13, 2020

• #15

 

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TILogistic

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• May 13, 2020

• #16

ImageView_Bmp.SetImage(cv.Snapshot) ??? Not

ImageView_Bmp.SetImage(cv.createbitmap ) YES

 

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