I’m doing it this way but it always shows view differently, idk whats wrong

@chickenfresh Can you check if adding a comparator helps?

@abhinay comparator for what? If saved position equals to the one I was scrolling to?

I’ve been debugging it for few hours, saved value remains to be the same but each time I’m reopening the view it scrolls to lower pos’s

Oh, I thought the items are shuffled. And therefore a comparator would help keep them in the same order.

no, order remains to be the same

Hi, someone knows some simple graphics editor for javafx?

@chickenfresh btw try to look on https://github.com/FXMisc/Flowless as container for your lists.

Been having a lot of fun using TornadoFX to bring optimization and machine learning models to life.

@thomasnield Nice video 👍

I'm trying to take a snapshot of a Group and use it as the background for the next frame - however I get some sort of visual artifact as can be seen in the gist. Anyone have any idea what I'm doing wrong? https://gist.github.com/hudsonb/bee3f7f42c50ce15073734d296ec8140

Can you try t.start() inside of the Stage.onShown()? It looks like there isn’t a Stage available when you kick off the timer

I moved it to onShown, still happens

Changing it to use a new WritableImage on each pulse fixes the issue in this toy example, but doesn't in my actual use case grr

Oh nevermind, it's still broken with a new WritableImage on each pulse, I just wasn't updating the image in the image view on each pulse

Huh if I don't draw on edges (x: 0 or width, y: 0 or height) it works, no visual artifact

Explicitly setting the viewport in SnapshotParameters resolves that issue

hey guys - playing with image processing today, and I'm starting to think I'm thinking about this the wrong way - I want to manipulate the pixels in an image with pixelreader/pixelwriter, but I don't know if using apply actually affects the imageview result. Thoughts?

-.kt

desaturate() returns new desaturated Color

val color = pixelReader.getColor(i, j) pixelWriter.setColor(i, j, color.desaturate())

Also I think you’ll need to have makePixelsBrighter() return the WritableImage so that you can assign it to the ImageView’s image property. As is you’re just throwing away the WritableImage you create.

Well actually I’d pass the ImageView to makePixelsBrighter, get the pixel reader from the image property, then assign your writable image to the image property when done. Currently you are always getting the PixelReader from rImage - the pixel colors in that are not being changed so every call to makePixelsBrighter will result in the same image.

@amanda.hinchman-dominguez I'd probably do something like this:

class MainView : View("It's alive!") {

    private val rImage = Image("/images/photo.jpg")
    private val wImage = WritableImage(rImage.pixelReader, 500, 250)

    override val root = borderpane {
        center {
            hbox {
                stackpane {
                    imageview(wImage).apply {
                        makePixelsBrighter(wImage)
                        makePixelsBrighter(wImage)
                        makePixelsBrighter(wImage)
                    }
                    hboxConstraints {
                        prefWidth = 500.0
                        prefHeight = 250.0
                    }
                }
            }
        }
    }

    private fun makePixelsBrighter(image: WritableImage) {
        val pixelReader = image.pixelReader
        val pixelWriter = image.pixelWriter

        // Determine the color of each pixel in a specified row
        for (i in 0 until image.width) {
            for (j in 0 until image.height) {
                val color = pixelReader.getColor(i, j)
                pixelWriter.setColor(i, j, color.desaturate())
            }
        }
    }
}

@hudsonb Thanks so much! So I did not actually return the writer, which probably explains why I don't see anything. But passing for ImageView, how would it know to work with the Image object inside it?

In the code I posted, the WritableImage is passed to the ImageView constructor and to makePixelsBrighter()

@amanda.hinchman-dominguez here is a working example

Also, if the

ColorAdjust

effect would meet your needs, I would imagine that would perform better.