How to draw an equilateral triangle in JavaFX? - javafx

Question

I'm trying to create a equilateral triangle with JavaFX. It is said that use the Polygon and setLayoutX() and setLayoutY(). So how to do that? This is the code I tried:
#Override public void start(Stage stage) throws Exception {
stage.setTitle("Board");
StackPane root = new StackPane();
Scene scene = new Scene(root, 600, 519);
stage.setScene(scene);
Polygon triangle = new Polygon();
stage.show();
}

Answer 1

Two problems:
You did not add the polygon to the container
You did not define the points of the polygon
Your code should be something like this:
#Override
public void start (Stage stage) throws Exception {
stage.setTitle("Board");
Polygon triangle = new Polygon();
//triangle.setLayoutX(100);
//triangle.setLayoutY(400);
triangle.getPoints()
.addAll(new Double[] {300.0, 50.0, 250.0, 100.0, 350.0, 100.0,});
Group root = new Group(triangle); // You can replace with StackPane for center alignment
Scene scene = new Scene(root, 600, 519);
stage.setScene(scene);
stage.show();
}
Once you do that, you should see something like the image below. You need to figure out the (x,y) coordinates for your triangle.
When I uncommented the setLayoutX() and setLayoutY() lines, the result was like the image below.
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