Font size, dpi and text crispness (snapping to pixels)

[Phil Race]

https://docs.oracle.com/javase/8/javafx/api/javafx/scene/text/Font.html#getDefault--

Gets the default font which will be from the family "System", and 
typically the style "Regular",
and be of a size consistent with the user's desktop environment, to the 
extent that can be determined.


-phil.

On 04/16/2015 07:28 AM, Damien Dudouit wrote:
> Hello,
>
> I'm experimenting with Java FX on a Windows 7 machine, using Java 1.8.0_40.
>
> The *javafx.scene.text.*Font javadoc says :
>
> *The size of a Font is described as being specified in points which are a
> real world measurement of approximately 1/72 inch. *
>
> *[...] Note that the real world distances specified by the default
> coordinate system only approximate point sizes as a rule of thumb and are
> typically defaulted to screen pixels for most displays. *
>
> Java FX behaves as if the display dpi is 72 while in my case for instance
> its about 96. 96/72 = 1.3333.
>
> So for instance if I set Font.font("Consolas", FontPosture.REGULAR, 10) as
> a font on a javafx.scene.control.TextArea, text appears a lot smaller than
> in my eclipse editor configured with the same font.
> Obviously, I get about the same visual size if I use a font size of 13 in
> Java FX while using the same font in size 10 in Eclipse.
>
> I guess I could set scaling somehow in my Java FX code. But using scaling,
> I imagine that text has little chance to display as crisp as it should.
>
> In fact, trying to compare the pixel output of Eclipse with font size 10
> and Java FX in font size 13 (or 13.333), the Java FX one is slightly blurry.
>
> What can be done in Java FX when an application needs text as clear as
> possible, for instance if the application is a text editor ?
>
> What is the correct approach in a Java FX app so that it respect the
> default font size configured at the OS level ?
>
>
> Thanks a lot in advance,
>
> Damien
>
>
> public final class MyApplication extends Application {
>
>    public static void main(String[] args) {
>      launch(args);
>    }
>
>    @Override
>    public void start(Stage primaryStage) {
>      TextArea editor = new TextArea();
>
>      editor.setFont(Font.font("Consolas", FontPosture.REGULAR, 10));
>
>      primaryStage.setScene(new Scene(editor));
>      primaryStage.show();
>
>      System.out.println(Toolkit.getDefaultToolkit().getScreenResolution());
>    }
> }