Javafx Collision Detection inTimeLine - animation

Question

I am using timeline for animating lines but I can't detect collisions.
Here is a short example of what I am trying to do basically.
Line line = new Line(100, 200, 200, 200);
Line line1= new Line(350,50,350,300);
Timeline animation = new Timeline(
new KeyFrame(Duration.seconds(1.5), new KeyValue(line.endXProperty(), 400))
);
animation.setCycleCount(1);
animation.play();
if(line.getBoundsInParent().intersects(line1.getBoundsInParent())){
System.out.println("Collision!");
}
Pane root = new Pane(line);
root.getChildren().add(line1);
Scene scene = new Scene(root, 400, 400);
primaryStage.setScene(scene);
primaryStage.show();
I used some other codes,method,ideas that I found in stackoverflow. Like following one:
Bounds bounds = line.getLayoutBounds();
Shape intersect = Shape.intersect(line, line1);
boolean intersects = intersect.getBoundsInLocal().getWidth() != -1;
System.out.println("Intersects: " + intersects);
if(intersect.getBoundsInLocal().getWidth() != -1)
{
System.out.println("This object can overlap other the other object!");
System.out.print("Collision detected!");
}
else
{
intersect.getBoundsInLocal().getWidth();
System.out.print("Collision not detected!");
}
And some variaions of this code.
Any idea would help

Answer 1

In this case, the "collision" (first time the lines intersect) is when line.endX reaches 350.
So you can simply do:
BooleanBinding intersecting = line.endXProperty().greaterThanOrEqualTo(350);
intersecting.addListener((obs, wasIntersecting, isNowIntersecting) -> {
System.out.println("Collision!");
});
i.e.:
import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.binding.BooleanBinding;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.shape.Line;
import javafx.stage.Stage;
import javafx.util.Duration;
public class AnimatedLine extends Application {
#Override
public void start(Stage primaryStage) {
Line line = new Line(100, 200, 200, 200);
Line line1= new Line(350,50,350,300);
BooleanBinding intersecting = line.endXProperty().greaterThanOrEqualTo(350);
intersecting.addListener((obs, wasIntersecting, isNowIntersecting) -> {
System.out.println("Collision!");
});
Timeline animation = new Timeline(
new KeyFrame(Duration.seconds(1.5), new KeyValue(line.endXProperty(), 400))
);
animation.setCycleCount(1);
animation.play();
Pane root = new Pane(line);
root.getChildren().add(line1);
Scene scene = new Scene(root, 400, 400);
primaryStage.setScene(scene);
primaryStage.show();
}
public static void main(String[] args) {
launch(args);
}
}
In general, detecting whether or not two line segments intersect might be a little harder than the case where one is horizontal and one vertical, but you can always solve the equations pretty easily and do something similar to this.