B4J Question Why are this imageview's borders flickering while moving ? Simple code.

TelKel81 · Jan 23, 2023

B4X:

Sub AppStart (Form1 As Form, Args() As String)
    Form1.Show

    Dim ivSize As Int = 300
   
    Dim iv As ImageView
    iv.Initialize("")
    Form1.RootPane.AddNode(iv, 0, 0, ivSize, ivSize)
   
    Dim bc As BitmapCreator
    bc.Initialize(ivSize, ivSize)
    bc.DrawRect(bc.TargetRect, xui.Color_Red, False, 1)
    bc.SetBitmapToImageView(bc.Bitmap, iv)

    iv.SetLayoutAnimated(10000, 250, 250, ivSize, ivSize)
End Sub

William Lancee · Jan 23, 2023

I am not sure what you mean by 'moving'.

iv.SetLayoutAnimated(10000, 250, 250, ivSize, ivSize)

Your animation is set for 10 seconds. Is that what you really want?

TelKel81 · Jan 23, 2023

While the view is being moved by SetLayoutAnimated, the red borders are flickering. What I really want is no flickering

William Lancee · Jan 23, 2023

Set animation to 0.

TelKel81 · Jan 23, 2023

That won't fix my issue when I'll start moving the view.

You get no flickering with the same code ?

William Lancee · Jan 23, 2023

On my screen it is not exactly flickering. The animation seems to use fairly large steps, which makes a bit jerky.
It definitely isn't smooth.

William Lancee · Jan 23, 2023

I tried a simpler view, with a similar effect, but not as severe.

B4X:

    Dim pnlSize As Int = 300
    Dim pnl As B4XView = xui.CreatePanel("")
    pnl.SetColorAndBorder(xui.Color_Transparent, 1, xui.Color_Red, 0)
    Root.AddView(pnl, 0, 0, pnlSize, pnlSize)
    pnl.SetLayoutAnimated(10000, 250, 250, pnlSize, pnlSize)

TelKel81 · Jan 23, 2023

Jerky might be a better word to describe the issue. I'm french canadian so...

Here's a link to a clip of my problem (using my/your code).

YouTube

William Lancee · Jan 23, 2023

That's not good. I have created many draggable objects and I have never had a problem like this.
That's probably because I handle all the redrawing/refreshing myself. Clearly the image object requires more time to refresh.
Also, the BitmapCreator functions may be slower than the Canvas drawing or native View rendering.

Other community members may know what causes this. If anyone knows more about this please respond.

B4J Question Why are this imageview's borders flickering while moving ? Simple code.

TelKel81

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William Lancee

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TelKel81

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TelKel81

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