Drawing shape with open lines in Java(f)x Canvas - javafx

Question

Is it possible to draw a shape with open ends?
E.g.: Let's say I want to draw a tree, which roots are open. Is there a elegant way to let the ends open, without overdrawing the already drawed lines?
I could overdraw it with shapes, which are exactly as big as my openings and have the color of the background, but I don't think that is the elegant way and I don't find any option to let them open. Perhaps I'm just blind and I could make strokePolygon(...) in which not all points are linked, but I think that's neither the way to go.
Let's have a simple shape:
[ceate Scene and Stage, etc]
Canvas sc = new Canvas(x, y);
GraphicsContext gcCs = cs.getGraphicsContext2D();
gcCs.setStroke(Color.BLACK);
double counter = 0.0;
[calculate points, instantiate arrays, etc]
for (int i = 0; i < arrayX.length; i++)
{
arrayX = shapeMidX + Math.cos(Math.toRadiants(counter * Math.PI)) * shapeSizeX / 2);
arrayY = shapeMidY + Math.sin(Math.toRadiants(counter * Math.PI)) * shapeSizeY / 2);
}
gcCs.strokePolygon(arrayX, arrayY, arrayX.length);
[making other things]
stackPane.getChildren().add(sc);
I know that I could use .strokeOval(), but I wanted to have a example that is near of my own code.
I like to draw my shapes from the center.
P.S.: I wrote the for() { } out of my head, it could be that there's something wrong. I've got no Internet at home at the moment, so my answers could be taking a lot of time.
Thank you in advance.

Answer 1

You could draw individual lines using strokeLine and store the current position in variables allowing you to draw any combination of lines.
You could also construct a path instead which allows you to use moveTo instead of lineTo to "skip" a segment. This way you don't need to keep track of the previous position for continuous lines.
The following example draws every other line of a square this way:
#Override
public void start(Stage primaryStage) {
Canvas canvas = new Canvas(400, 400);
GraphicsContext gc = canvas.getGraphicsContext2D();
gc.moveTo(100, 100);
gc.lineTo(100, 300);
gc.moveTo(300, 300);
gc.lineTo(300, 100);
// gc.moveTo(100, 100);
gc.stroke();
Scene scene = new Scene(new StackPane(canvas));
primaryStage.setScene(scene);
primaryStage.show();
}