The calculation of linear gradient borders takes into account the parent boundaries, not the node to which it is applied

Question

I want to apply a linear gradient to a line (width in width, i.e. in width). This line is a child of the node group. When I apply a linear gradient in the line, the color stops using the borders of the group, not the borders of the lines. In my code below, the linear gradient will display correctly when added in length, i.e. "Bottom", but not when adding width, i.e. To the right. Can someone tell me what could be for this? Here is SSCCE

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.shape.Line;
import javafx.stage.Stage;

public class Test extends Application {

@Override
public void start(Stage primaryStage) throws Exception {
    Group group = new Group();
    primaryStage.setScene(new Scene(group, 200, 350));

    Line line = new Line(100, 50, 100, 300);
    group.getChildren().add(line);
    line.setStyle("-fx-stroke-width:3em; -fx-stroke:linear-gradient(to right, red, green);");
    //line.setStyle("-fx-stroke-width:3em; -fx-stroke:linear-gradient(to bottom, red, green);");

    primaryStage.show();
}

public static void main(String[] args) {
    launch();
}

}

Answer 1

, , . , . .

com.sun.prism.j2d.J2DPrismGraphics, , fill():

void fill(java.awt.Shape shape) {
    if (paintWasProportional) {
        if (nodeBounds != null) {
            g2d.setPaint(toJ2DPaint(paint, nodeBounds));
        } else {
            g2d.setPaint(toJ2DPaint(paint, shape.getBounds2D()));
        }
    }
    g2d.fill(shape);
}

paintWasProportional , .

LinearGradient, , . :

@Override
public void start(Stage primaryStage) throws Exception {
    Group group = new Group();
    primaryStage.setScene(new Scene(group, 200, 350));

    Line line = new Line(100, 50, 100, 300);
    LinearGradient linearGradient = new LinearGradient(0d, 0d, 0d, 1d, true,
      CycleMethod.NO_CYCLE, new Stop(0,Color.RED),new Stop(1,Color.GREEN));
line.setStrokeWidth(36); // 3em
    line.setStroke(linearGradient);
    group.getChildren().add(line);
    primaryStage.show();
}

( ):

, to right, , :

LinearGradient linearGradient = new LinearGradient(0d, 50d, 0d, 300d,
       false, CycleMethod.REFLECT,new Stop(0,Color.RED), new Stop(1,Color.GREEN));   

.

, , :

LinearGradient linearGradient = new LinearGradient(100-18d, 0d, 100+18d, 0d,
 false, CycleMethod.REFLECT,new Stop(0,Color.RED), new Stop(1,Color.GREEN));

:

, CSS.