B4J Question Snapshot returns a bitmap that's 1 pixel bigger than the size of the node it captured.

TelKel81 · Feb 2, 2023

Always, no matter the size of the node (an Imageview. Also tried with a Pane).

My main issue is that this alters "the original" (via resizing by 1 pixel?) and also offsets it's center.

I wish I could use Imageview.GetImage but I can't because contrary to Imageview.Snapshot, Imageview.GetImage doesn't capture the output of JavaFx's effects (via setEffect method).

Any suggestion on how to solve this issue ?

Erel · Feb 2, 2023

Not sure. B4J simply calls the native Node.snapshot method.

TelKel81 · Feb 2, 2023

I think I could solve my problem by passing some snapshot parameters (i.e. the viewport) to the snapshot method, but I don't know how to handle the Callback part.

The documentation states :
public void snapshot(Callback<SnapshotResult,Void> callback, SnapshotParameters params, WritableImage image)

(And the callback cannot be Null).

TelKel81 · Feb 2, 2023

Never mind. No need for a callback.
This can also be used :
public void snapshot(SnapshotParameters params, WritableImage image)
Changing the viewport didn't immediately fix my issue, but I'm getting there

TelKel81 · Feb 2, 2023

I'm not sure if that's considered related to this forum thread, but I found out why snapshots created with JavaFx are blurry : see here.

TelKel81 · Feb 3, 2023

Problem solved. The bounds of the node's parent weren't whole numbers. That's what caused my blurry/offset snapshots.

Of note, I also discovered that project attribute #MainFormWidth: X doesn't necessarily equals X.
In my case :
#MainFormWidth: 800
Log(Form1.Width) -> 800.5565185546875

B4J Question Snapshot returns a bitmap that's 1 pixel bigger than the size of the node it captured.

TelKel81

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Erel

B4X founder

TelKel81

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TelKel81

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B4J Question Snapshot returns a bitmap that's 1 pixel bigger than the size of the node it captured.

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