Concatenating transforms to scale positions but not objects

Eric Bresie ebresie at
Sun Aug 11 12:15:41 UTC 2019

Are you focused on things from a pane/layout perspective here? Maybe some different layout might help.

Or are you looking for some form of “chart” component to allow lines to be graphed?

For others on the list...while I can see this list as more focused on development of there a list for users of openjfx and how to code with it?

Eric Bresie
Ebresie at
> On August 10, 2019 at 10:51:56 AM CDT, Mark Raynsford <org.openjdk at> wrote:
> On 2019-08-06T19:11:42 +0100
> Mark Raynsford <org.openjdk at> wrote:
> > Hello!
> >
> > I realize the subject is somewhat convoluted. I'm putting together
> > something that bears a passing resemblance to a DAW such as Ardour:
> Given the tumbleweeds and sounds of crickets, I'm guessing that I
> expressed my question rather poorly.
> Here's what I'm trying to do: I'm trying to set up a pane with a
> transform such that I can place objects inside that pane using
> positions that don't correspond to JavaFX "scene pixels". For example,
> 1024 units in my coordinate system might correspond to 1 "scene pixel"
> (is there a better name for the units that JavaFX uses?). However: The
> objects that are *inside* the objects that I add to the pane want to
> work in "scene pixels" (for example; Labels seem to want to work in
> pixel positions when rendering text).
> Here's a GitHub gist that gives a short example of this:
> I create one container group (actually a Pane) that adds a transform
> such that 1 unit == 32 pixels. I add objects to this container. Each
> object I add has an *external* pane with a size and position specified
> in units, and an *internal* pane that solely exists to invert the scale
> of the transform of the *external* pane. Inside this *internal* pane, I
> can add Labels and so on and these all render correctly.
> I set up bindings between the transforms so that I can effectively
> scale and pan the scene by adjusting the transform on the group
> container. However: Something about this setup seems to be confusing
> something inside JavaFX; the results I'm seeing onscreen don't seem to
> match what JavaFX believes the bounds of various objects are. This
> causes visual issues when I try to do things like set borders on
> objects, and also seems to confuse ScenicView.
> Here's a shot with the container group selected (looks correct):
> Here's a shot with the *external* pane of the bottom object selected:
> Note that, although the object actually renders onscreen as the right
> size (one of the pale grey boxes), ScenicView seems to believe that the
> object's bounds are 1x1: They *are* 1x1, but they're 1x1 when expressed
> in my custom coordinate system, not in JavaFX "scene pixels".
> Here's a shot with the *internal* pane of the bottom object selected:
> This looks correct in the sense that the bounds encompass the label and
> nothing else.
> Am I doing something wrong here? I can't tell if I'm basically abusing
> transforms or not.
> --
> Mark Raynsford |

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