On Fri, 23 Apr 2021 23:28:49 GMT, Kevin Rushforth <k...@openjdk.org> wrote:
>> Jonathan Vusich has updated the pull request incrementally with two
>> additional commits since the last revision:
>>
>> - Add tests for vertical axis as well
>> - Improve layout calculations for rotated text
>
> modules/javafx.controls/src/main/java/javafx/scene/chart/CategoryAxis.java
> line 365:
>
>> 363: double requiredLengthToDisplay =
>> calculateRequiredSize(side.isVertical(), tickLabelRotation);
>> 364: if (requiredLengthToDisplay > length) {
>> 365: if (tickLabelRotation != 90) {
>
> One difference between the new algorithm and the old is that the new doesn't
> take into account which side you are on. If the only two values are 0 or 90,
> then it wouldn't matter. But what happens when someone sets a 45 degree
> rotation (or 30)?
Well, it's complicated. The algorithm that calculates the required space for
the tick labels does not take into account the tick label rotation. I did not
look into adding this at this time because that opens up a lot of other
potential pathways that seem broader in scope. Currently, if the application
detects that there is not enough space to display the text at the current
rotation (which is assumed to be either 90 or 0 degrees), we rotate it by 90
degrees and remeasure. If that second remeasuring shows that the tick labels
can be fully displayed at that rotation, the tick label rotation is overwritten
to either 0 or 90 degrees. Theoretically if a user defines a set tick label
rotation, it can be overwritten under these circumstances. However, I think
this is reasonable given that when `autoRanging` is disabled a number of other
properties are also overwritten in a similar manner.
-------------
PR: https://git.openjdk.java.net/jfx/pull/342
