Hello,
I run a simple JavaFX application which shows a button with jdk 14.0.1
on Raspberry Pi and the drawn button has large size.
This is because of the algorithm which is used by
PrismFontFactory.getSystemFontSize() method [1] to select a system font
size.
If a system is embedded then the font size is calculated as
int screenDPI = Screen.getMainScreen().getResolutionY();
systemFontSize = ((float) screenDPI) / 6f; // 12 points
and the system is detected as embedded because the armv6hf architecture
is defined as embedded in the armv6hf.gradle file [2].
Raspberri Pi can work both with small touch displays and with big
monitors. It looks like Raspberry Pi should support two modes for font
size calculation: one for small screens and another for large.
I would like to contribute a fix for this but I do not know how the
right fix could look like.
Should there be a special screen size so for smaller screens the font is
is proportional to the screen size and for bigger screens the font size
is fixed?
Is there a way to check that used screen is from embedded device?
May be it should be solved in different way?
[1]
https://github.com/openjdk/jfx/blob/ec8608f39576035d41e8e532e9334b979b859543/modules/javafx.graphics/src/main/java/com/sun/javafx/font/PrismFontFactory.java#L1944
[2]
https://github.com/openjdk/jfx/blob/ec8608f39576035d41e8e532e9334b979b859543/buildSrc/armv6hf.gradle#L182
JavaFX application:
----------------------------
import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
public class ButtonFX extends Application {
public static void main(String[] args) {
launch(args);
}
@Override
public void start(Stage primaryStage) {
primaryStage.setTitle("Hello World!");
Button button = new Button("Hello, World!");
StackPane root = new StackPane();
root.getChildren().add(button);
primaryStage.setScene(new Scene(root, 300, 250));
primaryStage.show();
}
}
----------------------------
Thanks,
Alexander.
