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import javafx.scene.canvas.GraphicsContext;
import javafx.scene.image.Image;
public class BulletAnimated {
private Point2D position;
private Point2D start;
private Point2D speed;
private Point2D initialSpeed;
private double size;
private double mass = 2;
private double strenghtOfCannon = 2;
private double cannonLength = 100;
private boolean accelerate = true;
private boolean hitToGround = false;
private double crossSectionalArea;
private double dragCoefficient = 0.47;
private Image image;
private World world;
private Cannon cannon;
public BulletAnimated(World world, Cannon cannon) {
this(world, cannon, new Point2D(0, 0), new Point2D(0, 0), 10);
}
public BulletAnimated(World world, Cannon cannon, Point2D start, Point2D speed, double size) {
this.start = start;
this.position = this.start;
this.initialSpeed = speed;
this.speed = speed;
this.size = size;
this.world = world;
this.cannon = cannon;
image = new Image(getClass().getResourceAsStream("fireball-transparent.gif"), size, size,
true, true);
}
public void draw(GraphicsContext gc) {
gc.save();
Point2D canvasPosition = world.getCanvasPoint(position);
gc.drawImage(image, canvasPosition.getX(), canvasPosition.getY());
gc.restore();
}
public void simulate(double deltaT) {
double timeStep = deltaT * 1000;
if (accelerate && start.distance(position) < cannonLength) {
double cannonAngle = cannon.getAngle();
speed = speed
.add(new Point2D(Math.cos(cannonAngle) * strenghtOfCannon, Math.sin(cannonAngle) * strenghtOfCannon)
.multiply(1 / mass));
} else if (!hitToGround) {
accelerate = false;
Point2D airResistanceforce = new Point2D(
-1. / 2 * crossSectionalArea * Constants.AIR_DENSITY * dragCoefficient * Math.pow(speed.getX(), 2),
-1. / 2 * crossSectionalArea * Constants.AIR_DENSITY * 0.47 * Math.pow(speed.getY(), 2));
Point2D acceleration = new Point2D(-airResistanceforce.getX() * mass,
(-Constants.GRAVITATIONAL_ACCELERATION + airResistanceforce.getY()) * mass);
speed = speed.add(acceleration.multiply(timeStep / 1000));
}
if (!hitToGround) {
position = position.add(speed);
if (!accelerate && position.getY() <= size / 2) {
hitToGround = true;
position = new Point2D(position.getX(), size / 2);
}
} else {
reload();
}
}
public Rectangle2D getBoundingBox() {
return new Rectangle2D(position.getX(), position.getY(), size, size);
}
public boolean overlaps(Dragon dragon) {
return getBoundingBox().intersects(dragon.getBoundingBox());
}