Android Question B4XView.SetRoationAnimated ignores Pivot X/Y

Jeffrey Cameron

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If I set a view's PivotX and PivotY values with a JavaObject prior to invoking B4XView.SetRoation, it still rotates around the center of the view:
B4X: 
    Dim poB4V As B4XView = lblRotate
    Dim j As JavaObject = lblRotate
    Dim X As Float = lblRotate.Width ' make the pivot point the lower right-hand corner
    Dim y As Float = lblRotate.Height
    j.RunMethod("setPivotX", Array As Object(X))
    j.RunMethod("setPivotY", Array As Object(Y))
    poB4V.SetRotationAnimated(200, 0)
If I use the same JavaObject and call the "setRotation" method directly, the rotation is performed as expected on the requested pivot point (without the animation, of course).

Is there a method to make the SetRotationAnimated utilize a specific pivot point that I missed?
 
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Erel

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Jeffrey Cameron said:
Is there a method to make the SetRotationAnimated utilize a specific pivot point that I missed?
Click to expand...
No. It is possible with JavaObject. Another option is to put the view inside a transparent panel:



B4X: 
Sub Button1_Click
    Dim btn As B4XView = Sender
    btn.Parent.SetRotationAnimated(500, btn.Parent.Rotation + 360)
End Sub
 
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Jeffrey Cameron

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DonManfred said:
You set the PivotX and X at the lblRotate but you are using poB4V to animate????
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My goal here, is to animate the rotation of the label at the lower right-hand corner, not its center. There is no pivotx/y property in the B4XView object, therefore: javaobject and setPivotX/setPivotY.

I could, I suppose, manually calculate the linear rotation angle over time and achieve what I am looking for with javaobject setRotation in a loop, but that seems overkill. I had been using @Informatix's animation library, which still works fine. I was in the process of seeing if I could replace it with the native XUI methods and simplify the class in the process.

Erel said:
No. It is possible with JavaObject. Another option is to put the view inside a transparent panel:
Click to expand...
Thank you, that confirms my suspicion! I'll take this opportunity to suggest adding a PivotX / PivotY property to the B4XView object
 
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TILogistic

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I know what you mean, we had to make a class with these properties manipulating the smooth rotation times.

The post example uses timer.

View Utils

Subject: Set and get the 'padding' of a view. Sub: setPadding Description: Sets the padding'of a view. 'Sets the padding of a view 'v = view 'Left, Top, Right, Bottom padding values in pixels Sub setPadding(v As View, Left As Int, Top As Int, Right As Int, Bottom As Int) Dim jo = v As...
www.b4x.com

Rotating view around center

I would like to rotate a label and found this topic: https://www.b4x.com/android/forum/threads/rotate-a-view-degrees.75939/#content I'm using the setRotate method and although it does seem to rotate the label, it doesn not rotate around the center but it seems it is rotating around one of the...
www.b4x.com
 
Last edited:
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Jeffrey Cameron

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oparra said:
I know what you mean, we had to make a class with these properties manipulating the smooth rotation times.
Click to expand...
Thanks for the links! I'm currently using @Informatix's Excellent AnimationPlus library, for which I wrote a helper class to simplify the animation overhead. It works well, I was attempting to see if I could just utilize the (new-to-me) built-in XUI methods to remove the library dependency at some point. Currently not enough of the underlying translation methods/properties are exposed to make that happen.
 
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TILogistic

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remove the library dependency at some point. Currently not enough of the underlying translation methods/properties are exposed to make that happen.
Click to expand...

Do you mean in case of migrating your application to B4i or B4J?
 
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Jeffrey Cameron

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Our focus currently is B4A only, I was just hoping to "freshen up" the app and take advantage of the new features. For the app in question it was written long before resumable subs were available (early 2015 IIRC).
 
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