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Verified Commit 74259746 authored by Jan Kožusznik's avatar Jan Kožusznik
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Correct bullet simulation

parent ba626e1a
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......@@ -4,7 +4,7 @@ import javafx.geometry.Point2D;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.image.Image;
public class BulletAnimated {
public class BulletAnimated {
private Point2D position;
private Point2D start;
......@@ -12,10 +12,13 @@ public class BulletAnimated {
private Point2D initialSpeed;
private double size;
private double mass = 2;
private double strenghtOfCannon = 80;
private double strenghtOfCannon = 50;
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;
......@@ -44,19 +47,23 @@ public class BulletAnimated {
gc.restore();
}
public void simulate(double timeStep) {
public void simulate(double deltaT) {
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 * timeStep * 10));
.multiply(1 / mass * deltaT));
} else if (!hitToGround) {
accelerate = false;
Point2D acceleration = new Point2D(0, -Constants.GRAVITATIONAL_ACCELERATION*50 * mass * timeStep * 10);
speed = speed.add(acceleration.multiply(timeStep));
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(deltaT));
}
if (!hitToGround) {
position = position.add(speed.multiply(timeStep));
position = position.add(speed);
if (!accelerate && position.getY() <= size / 2) {
hitToGround = true;
position = new Point2D(position.getX(), size / 2);
......
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